Academic literature on the topic 'Ozone gas sensor'
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Journal articles on the topic "Ozone gas sensor"
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Petani, Lisa, Liane Koker, Janina Herrmann, Veit Hagenmeyer, Ulrich Gengenbach, and Christian Pylatiuk. "Recent Developments in Ozone Sensor Technology for Medical Applications." Micromachines 11, no. 6 (2020): 624. http://dx.doi.org/10.3390/mi11060624.
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There is increasing interest in the utilisation of medical gases, such as ozone, for the treatment of herniated disks, peripheral artery diseases, and chronic wounds, and for dentistry. Currently, the in situ measurement of the dissolved ozone concentration during the medical procedures in human bodily liquids and tissues is not possible. Further research is necessary to enable the integration of ozone sensors in medical and bioanalytical devices. In the present review, we report selected recent developments in ozone sensor technology (2016–2020). The sensors are subdivided into ozone gas sensors and dissolved ozone sensors. The focus thereby lies upon amperometric and impedimetric as well as optical measurement methods. The progress made in various areas—such as measurement temperature, measurement range, response time, and recovery time—is presented. As inkjet-printing is a new promising technology for embedding sensors in medical and bioanalytical devices, the present review includes a brief overview of the current approaches of inkjet-printed ozone sensors.
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Acuautla, Mónica, Sandrine Bernardini, and Marc Bendahan. "Ozone Sensor on Flexible Substrate by ZnO Nanoparticles." Key Engineering Materials 605 (April 2014): 163–66. http://dx.doi.org/10.4028/www.scientific.net/kem.605.163.
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In this work the ozone detection in flexible substrate has been investigated. The flexible test platform with an integrated heater was designed and then characterized by thermal simulations using finite elements and its electrical properties have been studied. ZnO nanoparticles were deposited by drop coating process on the flexible substrate with platinum interdigited electrodes for gas detection. The gas sensing properties were determined by ozone exposure at different concentrations and temperatures. The gas sensing measurements present good response at different gas concentrations, good repeatability and fast recovery.
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Hosoya, Yuuki, Yoshiteru Itagaki, Hiromichi Aono, and Yoshihiko Sadaoka. "Ozone detection in air using SmFeO3 gas sensor." Sensors and Actuators B: Chemical 108, no. 1-2 (2005): 198–201. http://dx.doi.org/10.1016/j.snb.2004.10.059.
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Izawa, Kuniyuki. "SnO2-Based Gas Sensor for Detection of Refrigerant Gases." Proceedings 14, no. 1 (2019): 32. http://dx.doi.org/10.3390/proceedings2019014032.
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Takada, Tadashi, Hiromasa Tanjou, Tatsuo Saito, and Henki Harada. "Aqueous Ozone Detector Using In2O3Thin Film Semiconductor Gas Sensor." Ozone: Science & Engineering 20, no. 6 (1998): 507–12. http://dx.doi.org/10.1080/01919519809480337.
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David, Michael, Tay Ching En Marcus, Maslina Yaacob, et al. "Incident Angle Approach to Sensitivity Enhancement for Ozone Sensor." Applied Mechanics and Materials 735 (February 2015): 255–59. http://dx.doi.org/10.4028/www.scientific.net/amm.735.255.
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The design and mathematical model of a reflective type optical gas sensor is presented. Light source is radiated at an incident angle for 10 cm gas cell with an internal diameter of 0.4 cm. At an incident angle of 1o, optical path length obtained is 342.7886 cm, at 27o incident angle, optical path length is 10.4926 cm and at an incident angle of 28o, optical path length is 9.9631 cm. The model is most efficient at lower incident angles, precisely between (1o and 27o). Effects of variation in diameter and length of gas cell are also demonstrated.
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Capula-Colindres, S., K. Aguir, F. Cervantes-Sodi, L. A. Villa-Vargas, and Vicente Garibay-Febles. "Carbon Nanotubes Functionalized by Nanoparticles of Platinum." Materials Science Forum 793 (May 2014): 45–50. http://dx.doi.org/10.4028/www.scientific.net/msf.793.45.
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Carbon nanotubes (CNT) based gas sensors have attracted interest due to their excellent properties. Several studies have reported changes in the CNT’s electrical properties when functionalized with platinum (Pt) nanoparticles. In this investigation, the vapor phase impregnation decomposition (VPID) method was employed to incorporate Pt nanoparticles on CNT. Both, Pt nanoparticles and CNT were characterized by high resolution transmission electron microscopy (HR-TEM). The sensitivity of sensors based on CNT doped with Pt, was evaluated with ozone molecules. TEM images showed low and heterogeneous distribution on the surface of carbon nanotubes. The gas evaluation of CNT-Pt sensor presents good and quick response to ozone molecules at different concentrations and temperatures. The best response was found to be at 120 °C.
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Pitts, M. C., L. W. Thomason, J. M. Zawodny, et al. "Ozone observations by the Gas and Aerosol Measurement Sensor during SOLVE II." Atmospheric Chemistry and Physics 6, no. 9 (2006): 2695–709. http://dx.doi.org/10.5194/acp-6-2695-2006.
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Abstract. The Gas and Aerosol Measurement Sensor (GAMS) was deployed aboard the NASA DC-8 aircraft during the second SAGE III Ozone Loss and Validation Experiment (SOLVE II). GAMS acquired line-of-sight (LOS) direct solar irradiance spectra during the sunlit portions of ten science flights of the DC-8 between 12 January and 4 February 2003. Differential line-of-sight (DLOS) optical depth spectra are produced from the GAMS raw solar irradiance spectra. Then, DLOS ozone number densities are retrieved from the GAMS spectra using a multiple linear regression spectral fitting technique. Both the DLOS optical depth spectra and retrieved ozone data are compared with coincident measurements from two other solar instruments aboard the DC-8 platform to demonstrate the robustness and stability of the GAMS data. The GAMS ozone measurements are then utilized to evaluate the quality of the Wulf band ozone cross sections, a critical component of the SAGE III aerosol, water vapor, and temperature/pressure retrievals. Results suggest the ozone cross section compilation of Shettle and Anderson currently used operationally in SAGE III data processing may be in error by as much as 10–20% in the Wulf bands, and their lack of reported temperature dependence is a significant deficiency. A second, more recent, cross section database compiled for the SCIAMACHY satellite mission appears to be of much better quality in the Wulf bands, but still may have errors as large as 5% near the Wulf band absorption peaks, which is slightly larger than their stated uncertainty. Additional laboratory measurements of the Wulf band cross sections should be pursued to further reduce their uncertainty and better quantify their temperature dependence.
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Pitts, M. C., L. W. Thomason, J. M. Zawodny, et al. "Ozone observations by the Gas and Aerosol Measurement Sensor during SOLVE II." Atmospheric Chemistry and Physics Discussions 5, no. 5 (2005): 9953–92. http://dx.doi.org/10.5194/acpd-5-9953-2005.
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Abstract. The Gas and Aerosol Measurement Sensor (GAMS) was deployed aboard the NASA DC-8 aircraft during the second SAGE III Ozone Loss and Validation Experiment (SOLVE II). GAMS acquired line-of-sight (LOS) direct solar irradiance spectra during the sunlit portions of ten science flights of the DC-8 between 12 January and 4 February 2003. Differential line-of-sight (DLOS) optical depth spectra are produced from the GAMS raw solar irradiance spectra. Then, DLOS ozone number densities are retrieved from the GAMS spectra using a multiple linear regression spectral fitting technique. Both the DLOS optical depth spectra and retrieved ozone data are compared with coincident measurements from two other solar instruments aboard the DC-8 platform to demonstrate the robustness and stability of the GAMS data. The GAMS ozone measurements are then utilized to evaluate the quality of the Wulf band ozone cross sections, a critical component of the SAGE III aerosol, water vapor, and temperature/pressure retrievals. Results suggest the ozone cross section compilation of Shettle and Anderson currently used operationally in SAGE III data processing may be in error by as much as 10–20% in the Wulf bands, and their lack of reported temperature dependence is a significant deficiency. A second, more recent, cross section database compiled for the SCIAMACHY satellite mission appears to be of much better quality in the Wulf bands, but still may have errors as large as 5% near the Wulf band absorption peaks. Additional laboratory measurements of the Wulf band cross sections should be pursued to further reduce their uncertainty and better quantify their temperature dependence.
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van der A, R. J., M. A. F. Allaart, and H. J. Eskes. "Multi sensor reanalysis of total ozone." Atmospheric Chemistry and Physics 10, no. 22 (2010): 11277–94. http://dx.doi.org/10.5194/acp-10-11277-2010.
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Abstract. A single coherent total ozone dataset, called the Multi Sensor Reanalysis (MSR), has been created from all available ozone column data measured by polar orbiting satellites in the near-ultraviolet Huggins band in the last thirty years. Fourteen total ozone satellite retrieval datasets from the instruments TOMS (on the satellites Nimbus-7 and Earth Probe), SBUV (Nimbus-7, NOAA-9, NOAA-11 and NOAA-16), GOME (ERS-2), SCIAMACHY (Envisat), OMI (EOS-Aura), and GOME-2 (Metop-A) have been used in the MSR. As first step a bias correction scheme is applied to all satellite observations, based on independent ground-based total ozone data from the World Ozone and Ultraviolet Data Center. The correction is a function of solar zenith angle, viewing angle, time (trend), and effective ozone temperature. As second step data assimilation was applied to create a global dataset of total ozone analyses. The data assimilation method is a sub-optimal implementation of the Kalman filter technique, and is based on a chemical transport model driven by ECMWF meteorological fields. The chemical transport model provides a detailed description of (stratospheric) transport and uses parameterisations for gas-phase and ozone hole chemistry. The MSR dataset results from a 30-year data assimilation run with the 14 corrected satellite datasets as input, and is available on a grid of 1× 1 1/2° with a sample frequency of 6 h for the complete time period (1978–2008). The Observation-minus-Analysis (OmA) statistics show that the bias of the MSR analyses is less than 1% with an RMS standard deviation of about 2% as compared to the corrected satellite observations used.
Dissertations / Theses on the topic "Ozone gas sensor"
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Acuautla, Meneses Monica Isela. "Development of ozone and ammonia gas sensors on flexible substrate." Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4337/document.
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L'émergence des nouvelles applications dans le domaine de la micro et nanotechnologie requière de faibles coûts de fabrication et la caractérisation de dispositifs électroniques ayant des propriétés telles que la flexibilité, la portabilité, la légèreté, et des matériaux de faibles coûts. Les méthodes traditionnelles de fabrication impliquent de longues étapes de production, et des procédés de fabrication impliquant des étapes avec des produits chimiques. Le but de cette thèse est d'étudier la conception et la caractérisation de capteurs d'ammoniac et d'ozone sur support souple fabriqués par des processus de photolithographie et de gravure laser. Le support flexible est composé de Kapton avec des électrodes interdigitées de Ti/Pt pour la détection de gaz et un microchauffage. Les motifs du circuit ont été réalisés par photolithographie et gravure laser. L'utilisation de gravure laser sur support souple permet de réduire les coûts liés au temps de fabrication, aussi représente une excellente alternative aux processus chimiques. Des nanoparticles de ZnO déposées par gouttes ont été utilisées comme matériaux sensibles en raison de leurs excellentes propriétés dans la détection de gaz. Les conditions de détection de gaz ont été étudiées pour différentes concentrations d'ozone et d'ammoniac. Afin de tester une méthode de dépôt utilisée dans la production industrielle à grande échelle, un dépôt par spray ultrasonique a été effectué. Les capteurs réalisés montrent une large gamme de détection de 5 ppb à 500 ppb à 200 °C pour l'ozone et de 5 ppm à 100 ppm à 300 °C pour l'ammoniac avec une bonne reproductibilité, stabilité et de rapides temps de réponse et de retournNowadays the emerging of new applications in the micro and nanotechnology field required to reduce fabrication costand to improve electronic devices with properties such as flexibility, portability, lightweight, and low cost. Traditional methods involve expensive and long production steps, and chemical vapor deposition. The purpose of this work is to present the conception and characterization of flexible ammonia and ozone sensors fabricated by photolithography and laser ablation processes. The flexible platform is composed of Kapton substrate with interdigitated Ti/Pt electrodes for gas detection and a micro-heater device. The circuit patterns were realized by photolithography and laser ablation. Photolithography is a well-known and reliable patterning process used on rigid substrate. The application of laser ablation process not only reduces fabrication time, but also represents an excellent viable alternative instead of chemical processes. ZnO thin films deposited by drop coating have been used as sensitive materials due to their excellent properties in the gas detection. The gas sensing condition and the performances of the devices are investigated for ozone and ammonia at different gas concentrations and different thin film thicknesses. In order to test a deposit methodology used in large scale industrial production, an ultrasonic spray deposition was done. The sensor provides a wide range of detection from 5 ppb to 500 ppb for ozone and from 5 ppm to 100 ppm for ammonia. Their best sensibilities were obtained at 200°C for ozone and 300 °C for ammoniac with good repeatability, stability and fast response/recovery time
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Pelissari, Pedro Ivo Batistel Galiote Brossi. "Síntese e caracterização de filmes finos SrTi1-xFexO3 nanoestruturados aplicados como sensor de gás ozônio." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-17082012-110437/.
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Neste trabalho, foram desenvolvidos filmes finos de composição SrTi1-xFexO3 (0,00≤ x ≤0,150) nanoestruturados visando sua aplicação como sensor de gás ozônio. Os filmes finos foram depositados através da técnica de deposição por feixe de elétrons (EBD) cujo alvo utilizado foram pastilhas obtidas a partir do pó cristalino SrTi1-xFexO3 (0,00≤ x ≤0,150) sintetizadas através do método dos precursores poliméricos. Foi observado a partir das analises termogravimétrica e térmica diferencial que a incorporação de ferro no sistema diminui a temperatura de queima do pó precursor, sugerindo que o ferro atua como catalisador na cadeia polimérica. Os filmes depositados por DFE apresentam-se no estado amorfo sendo necessário um tratamento térmico ex-situ para que a fase cristalina desejada seja obtida. Todos os filmes apresentaram uma boa aderência aos diferentes tipos de substratos utilizados. Após o processo de cristalização, os filmes depositados sobre diferentes substratos foram caracterizados através das técnicas de difração de raios-X, espectroscopia UV-Vis e microscopia de força atômica (MFA). Foi observado que um aumento na temperatura de tratamento térmico dos filmes leva a um aumento no grau de cristalização e a uma diminuição no valor da energia de gap, calculada a partir dos espectros UV-VIS. A analise por MFA mostrou que a mudança do tipo de substrato utilizado não influencia as propriedades estruturais e microestruturais dos filmes. Através da realização de medidas de resistência elétrica, observou-se que os filmes cristalinos submetidos a um tratamento térmico ex-situ a 500oC por 4 horas apresentaram uma boa sensibilidade ao gás ozônio sendo possível detectar a presença de até 75 ppb de ozônio.In this study, nanostructured thin films of SrTi1-xFexO3 (0.00 ≤ x ≤ 0.150) compositions were prepared looking their application as ozone gas sensor. The thin films were deposited using the technique of electron beam deposition (EBD) whose targets were obtained from polycrystalline SrTi1-xFexO3 (0.00 ≤ x ≤ 0.150) powders synthesized by the polymeric precursor method. It was observed from the thermogravimetric and differential thermal analysis that the incorporation of iron in the system decreases the calcination temperature of the precursor powders, suggesting that the iron acts as a catalyst in the polymer chain. The as obtained films deposited by EBD present an amorphous state being necessary a ex-situ heat treatment to obtain the desired crystalline phase. All films showed good adhesion to different substrates. After the crystallization process, the films deposited on different substrates were characterized through X-ray diffraction, UV-Vis spectroscopy and atomic force microscopy (AFM) trechniques. It was observed that an increase in the annealing temperature of the film results in an increase in the degree of crystallization and a decrease in the value of band gap energy, which was calculated from the UV-VIS spectra. The AFM analysis showed that changing the type of substrate does not influence the structural properties and microstructure of the films. By carrying out measurements of electrical resistance, it was observed that the crystalline films subjected to a ex-situ heat treatment at 500oC for 4 hours showed a good sensitivity to the ozone gas being possible to detect the presence of up to 75 ppb ozone.
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Borkar, Chirag. "Development of Wireless Sensor Network System for Indoor Air Quality Monitoring." Thesis, University of North Texas, 2012. https://digital.library.unt.edu/ark:/67531/metadc177181/.
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This thesis describes development of low cost indoor air quality (IAQ) monitoring system for research. It describes data collection of various parameters concentration present in indoor air and sends data back to host PC for further processing. Thesis gives detailed information about hardware and software implementation of IAQ monitoring system. Also discussed are building wireless ZigBee network, creating user friendly graphical user interface (GUI) and analysis of obtained results in comparison with professional benchmark system to check system reliability. Throughputs obtained are efficient enough to use system as a reliable IAQ monitor.
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Fechete, Alexandru Constantin, and e54372@ems rmit edu au. "Layered Surface Acoustic Wave Based Gas Sensors Utilising Nanostructured Indium Oxide Thin Layer." RMIT University. Electrical and Computer Engineering, 2009. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20091105.141111.
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Planar two-dimensional (2-D) nanostructured indium oxide (InOx) and one-dimensional (1-D) tin oxide (SnO2) semiconductor metal-oxide layers have been utilised for gas sensing applications. Novel layered Surface Acoustic Wave (SAW) based sensors were developed consisting of InOx/SiOxNy/36°YXLiTaO3, InOx/SiNx/SiO2/36°YXLiTaO3 and InOx/SiNx/36°YXLiTaO3 The 1 µm intermediate layers of silicon oxynitride (SiOxNy), silicon nitride (SiNx) and SiO2/SiNx matrix were deposited on lithium tantalate (36°YXLiTaO3) substrates by r.f. magnetron sputtering, electron-beam evaporation and plasma enhanced chemical vapour deposition (PECVD) techniques, respectively. As a gas sensitive layer, a 100 nm thin layer of InOx was deposited on the intermediate layers by r.f. magnetron sputtering. The targeted gases were ozone (O3) and hydrogen (H2). An intermediate layer has multiple functions: protective role for the interdigital transducers' electrodes as well as an isolating effect from InOx sensing layer, thereby improving the sensor performance. The developed SAW sensors' exhibited high response magnitudes with repeatable, reversible and stable responses towards O3 and H2. They are capable of sensing concentrations as low as 20 parts-per-billion for O3 and 600 parts-per-million for H2. Additionally a conductometric type novel sensing structure of SnO2/36°YX LiTaO3 was also developed by depositing a thin layer of SnO2 nanorods by PECVD. The gas sensing performance exhibited repeatable, reversible, stable responses towards NO2 and CO. The surface morphology, crystalline structure and preferred orientation of the deposited layers were investigated by Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD). A polycrystalline, oxygen deficient non-stoichiometric InOx with grain sizes of 20-40 nm was revealed. The 1-D nanostructures were characterised by Transmission Electron Microscopy (TEM) showing nanorods with needle-like shape , diameters of 10-20 nm a t the top and 30-40 nm at the base as well as a preferential growth orientation of [ ] on the LiTaO3 substrate. The developed sensors are promising for O3, H2 and CO sensing.
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Júnior, Carlos Augusto Escanhoela. "Síntese e caracterização do sistema nanoestruturado Sr1-XLaxTi1-yFeyO3: Aplicação como sensor de gás." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-17072015-153332/.
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Os materiais de estrutura perovskita compreendem um vasto grupo de compostos cuja estrutura na sua forma mais simples pode ser representada pela fórmula química ABO3. Uma das principais vantagens que a estrutura perovskita apresenta é o alto grau de flexibilidade em acomodar uma grande variedade de átomos nos sítios A e B, permitindo um maior controle de suas propriedades físicas e químicas bem como a manutenção de sua estrutura básica, mesmo para altas concentrações de átomos substituintes. Devido estas propriedades, estes materiais têm sido aplicados com sucesso como capacitores, varistores, fotoeletrodos, memóriasferroelétricas e sensores de gases. Nas últimas décadas, tem sido reportada a utilização do titanato de estrôncio (SrTiO3, ST) na forma de filmes finos e espessos como sensor de gás oxigênio em altas temperaturas (>500 °C). Recentemente, foi mostrado que o titanato de estrôncio dopado com Fe apresentava uma excelente sensibilidade ao gás ozônio. Entretanto, neste trabalho, somente uma composição foi caracterizada e nem todas as propriedades importantes em relação a esta aplicação foram completamente exploradas. Neste contexto, esta tese de doutorado teve como objetivo verificar o efeito da substituição do átomo de estrôncio pelo lantânio e do titânio pelo Ferro no composto SrTiO3 na forma de pó e filmes finos nanoestruturados com a finalidade de verificar o efeito destas substituições nas propriedades sensoras do material. Inicialmente, com o objetivo de avaliar a influência da adição de La na estrutura do composto ST, amostras na forma de pó do sistema Sr1-xLaxTiO3.(SLT) foram preparadas através do método dos precursores poliméricos. Posteriormente, pelo mesmo método, foram sintetizadas amostras do sistema SrTi1-xFexO3 (STF) e Sr1-XLaxTi1-yFeyO3 (SLTF). A partir das amostras na forma de pó e na forma de solução, filmes finos e espessos foram respectivamente obtidos através das técnicas de deposição por feixe de elétrons (EBD) e spin-coating (SC). As amostras nanoestruturadas na forma de pó e na forma de filmes foram caracterizadas por difração de raios X, espectroscopia de absorção de raios X (XANES) na borda K do Ti e do Fe e espectroscopia de fotoelétrons excitados por raios X (XPS). A análise morfológica foi realizada através das técnicas de microscopia eletrônica de varredura (MEV) e microscopia de força atômica (MFA). As amostras do sistema STF e SLTF na forma de filmes finos foram avaliadas em relação à sensibilidade aos gases O3, NO2, NH3 e CO. Os resultados indicaram que os filmes do sistema SLTF depositados pela técnica de deposição por feixe de elétrons apresentam uma maior sensibilidade ao gás ozônio, enquanto o filme de mesma composição depositado pelo método de spin-coating apresentou uma melhor estabilidade e tempo de recuperação em relação a este mesmo gás.The perovskite structure materials comprise a large group of compounds with the structure in simple form can be represented by the ABO3. chemical formula. The main advantage that the perovskite structure presents is the high degree of flexibility to accommodate a wide variety of atoms in sites A and B, allowing a greater control of physical and chemical properties of the material, maintaining its structure even for a high concentrations of substituent\'s. Due to these properties, these materials have been successfully applied as capacitors, varistors, photoelectrodes, ferroelectric memories and gas sensors. In the last decade, strontium titanate (SrTiO3, ST) in the form of thin and thick films have been reported as oxygen gas sensor at higher temperatures (> 500 °C). Recently, strontium titanate doped with Fe was used as the first ozone sensor. However, the work was carried out only with a certain composition and some important properties for this application have not been fully exploited. In this context, this PhD thesis aimed to the synthesis of strontium titanate system in powder form and nanostructured thin films with the substitution of Sr for La and Ti for Fe. In order to verify the effect of these substitutions in material properties initially Sr1-xLaxTiO3 (SLT) samples were prepared in powder form by the polymeric precursor method in order to evaluate the influence of the addition of La in the structure of the compound ST. Subsequently, samples were synthesized from SrTi1-x Fex O3 (STF) and Sr1-XLaxTi1-yFeyO3 (SLTF) systems through the polymeric precursors, which were used for the deposition of thin and thick films, which were respectively obtained through electron beam deposition techniques (EBD) and spin-coating (SC). Samples in the form of nanostructured powder and thin films were characterized by X-ray diffraction, X-ray absorption spectroscopy (XANES) at Ti and Fe K-edges and by X-ray photoelectron spectroscopy (XPS). Morphological analysis was performed using the scanning electron microscopy (SEM) and atomic force microscopy (AFM) techniques. The STF and SLTF samples in a thin film form were evaluated towards their sensitivity to O3, NO2, NH3 and CO gases. The results indicated that SLTF films deposited by electron beam deposition technique exhibit higher sensitivity to ozone gas. However the same composition deposited by spin-coating showed a better stability and recovery time relative to the same gas.
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Catto, Ariadne Cristina. "Síntese e caracterização de filmes finos e espessos de ZnO: aplicação como sensores de gás." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/18/18158/tde-21032017-152552/.
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O desenvolvimento de novos materiais que possam ser aplicados como sensores resistivos de gás torna-se mais importante a cada dia devido sua importância no monitoramento ambiental, controle de emissão industrial e aplicações médicas. Desta forma, esforços têm sido realizados a fim de desenvolver dispositivos funcionais que apresentem uma alta sensibilidade, seletividade e baixo consumo de energia operando em temperaturas próximas a temperatura ambiente. O composto ZnO nanoestruturado puro e/ou dopado exibindo diferentes morfologias têm sido apontado como um candidato promissor na detecção de diferentes tipos de gases devido suas propriedades eletrônicas e da alta razão superfície/volume que facilitam a adsorção de espécies gasosas sobre sua superfície. Adicionalmente, diferentes estudos tem mostrado que o desempenho de sensores resistivos pode ser melhorado através da inserção de dopantes na rede ou na superfície do material sensor. Motivados por essas considerações, neste trabalho, filmes finos e espessos de composição ZnO e Zn1-xCoxO nanoestruturados obtidos através dos métodos dos precursores poliméricos, RF sputtering e tratamento hidrotermal foram avaliados visando sua aplicação como sensor dos gases O3, NO2 e CO. O estudo das propriedades estruturais de longo alcance investigadas através da técnica de difração de raios X mostrou que a adição de cobalto causa uma diminuição da intensidade dos picos de difração. Medidas do espectro de absorção de raios-X indicaram que nas amostras obtidas pelo método dos precursores poliméricos e RF sputtering, respectivamente, os átomos de Co assumem predominantemente o estado de valência 2+ e 3 +. A composição química da superfície das amostras foi analisada através da técnica de espectroscopia de fotoelétrons de raios X (XPS) enquanto as propriedades microestruturais foram avaliadas por microscopia eletrônica de varredura (MEV) e microscopia de força atômica (AFM). Medidas da resistência elétrica das amostras foram utilizadas para avaliar as propriedades sensoras das amostras, como a sensibilidade, a seletividade, o tempo de resposta e de recuperação quando expostos a diferentes concentrações dos gases O3, CO e NO2. As medidas de resistência elétrica quando os filmes foram expostos as estes gases mostrou que as três metodologias de síntese foram eficientes na obtenção de amostras que apresentam um grande potencial para serem aplicadas como sensores de gás. Entretanto, a amostra obtida por RF-sputtering apresentou as melhores propriedades de detecção ao gás ozônio com, valor de resposta quarenta (40) vezes maior, que foi atribuído a sua alta rugosidade e as características microestruturais apresentadas por essa amostra. As amostras Zn1-xCoxO obtidas pelo método dos precursores poliméricos exibiram uma maior sensibilidade ao ozônio e uma menor temperatura de trabalho em relação a amostra ZnO, preparada por esse mesmo método. Além disso, a adição de cobalto contribuiu para a seletividade do composto. A melhora das propriedades sensoras foram atribuídas a uma melhor atividade catalítica causada pelos íons Co e a presença de defeitos na superfie do material, que favoreceu a adsorção das moléculas de oxigênio na superfície da amostraThe development of new materials to be applied as gas resistive sensors has become increasingly important regarding environmental monitoring, industrial emission control and medical applications. Pure or doped ZnO nanostructured compounds that exhibit different morphologies have been identified as promising candidates for the detection of different types of toxic gases due to their electronic properties and high surface/volume ratio, which facilitates the adsorption of gaseous species on their surface. Studies have shown the performance of resistive sensors can be improved by the doping or presence of defects in the network or at the surface of the sensor material. The present doctoral thesis addresses the evaluation of ZnO and Zn1-xCoxO nanostructured films obtained by the polymeric precursor method, RF sputtering deposition and hydrothermal treatment and their application as O3, NO2 and CO gas sensors. Their long-range order structure investigated by the X-ray diffraction technique showed the addition of cobalt decreases the intensity of diffraction peaks. Measurements of X-ray absorption spectra at Co K-edge indicated Co atoms in the samples obtained by the RF sputtering technique and polymeric precursor method predominantly assume the 2+ and 3+ oxidation state. Measurements of electrical resistance were used in the evaluation of ZnO and Zn1-xCoxO nanostructured films sensing properties such as sensitivity, selectivity, response and recovery times under different concentrations of O3, CO and NO2 gases. The electrical resistance of the films exposed to those gases showed the three methodologies of synthesis effectively obtained samples to be applied as gas sensors. However, the sample obtained by the RF-sputtering deposition technique exhibited the best detection properties towards ozone gas and a forty-time higher response value, attributed to greater roughness and microstructural features. Zn1-xCoxO samples obtained by the polymeric precursor method exhibited higher sensitivity and a lower working temperature in relation to ozone gas. Such characteristics were attributed to a better catalytic activity promoted by the addition of Co ions and the presence of defects on the surface of the material, which favors the adsorption of oxygen molecules on the sample surface.
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Ghaddab, Boutheina. "Développement d’un capteur de gaz à base de couche hybride dioxyde d’étain / nanotubes de carbone." Thesis, Besançon, 2012. http://www.theses.fr/2012BESA2028/document.
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L’objectif de cette étude est le développement d’un capteur de gaz à base de couche hybrideSnO2/SWNTs dans le but d’améliorer les performances des capteurs chimiques « classiques »uniquement constitués de dioxyde d’étain. En premier lieu, afin de maîtriser la synthèse dumatériau sensible, nous avons validé l’élaboration d’une couche sensible à base de dioxyded’étain préparée par procédé sol-gel. Le matériau synthétisé a été déposé par la technique ‘microgoutte’sur une micro-plateforme permettant simultanément le chauffage de la couche sensible etla mesure de sa conductance. L’étude des réponses électriques du capteur de gaz en présence dubenzène a permis de valider la possibilité d’utilisation du sol d’étain préparé pour la réalisation decouches sensibles aux gaz. En effet, des traces de benzène (500 ppb) ont été détectées à latempérature optimale de couche sensible de 420°C.Le second volet de cette étude repose sur la fabrication du matériau hybride obtenu par dispersiondes nanotubes de carbone dans un sol d’étain. Les couches sensibles élaborées par dip-coating àpartir du sol d’étain modifié par les nanotubes de carbone ont clairement montré la possibilité dedétection de divers gaz (ozone et ammoniac) à température ambiante. Ce résultat constitue l’undes points importants de ce travail de thèse dans la mesure où jusqu’à présent les capteurschimiques à base de dioxyde d’étain ne présentaient une forte sensibilité aux gaz que pour destempératures de fonctionnement de l’ordre de 350-400°C. Pour les deux gaz cibles étudiés dans lecadre de ce travail, la limite de détection à température ambiante a été évaluée à 1 ppm enprésence de NH3 et est inférieure à 20 ppb en présence d’ozone.La dernière partie de ce travail a porté sur l’optimisation des performances de détection descouches hybrides. Dans ce cadre, les expérimentations ont porté sur l’étude de l’influence dedivers paramètres tels que la quantité de nanotubes dans le matériau hybride, la température decalcination de la couche sensible, la température de fonctionnement ou encore les propriétésphysico-chimiques des nanotubes de carbone (mode de synthèse, diamètre,…) sur l’efficacité dedétection des couches sensibles. Les résultats ainsi obtenus en termes de performance de détectionont été discutés en relation avec les paramètres expérimentaux utilisésThe objective of this study is to develop a gas sensor based on a hybrid layer of SnO2/SWNTs inorder to improve the performance of “Conventional” chemical sensors basically made from tinoxide. First, in order to control the synthesis of the sensitive material, we validated the elaborationof a sensitive layer based on tin dioxide prepared using the sol-gel process. The synthesizedmaterial was deposited by the 'microdrop' technique on a micro-platform which simultaneouslyallows the heating of the sensitive layer whilst also measuring its conductance. The study of theelectrical responses of the gas sensor in the presence of benzene has allowed us to validate thepossibility of using our prepared tin sol for the realization of gas sensitive layers. In fact, it waspossible to detect benzene at traces with an optimal temperature of the sensing layer found to be420ºC.The second part of this study describes the synthesis of the hybrid sensor obtained by dispersingSWNTs in the tin-oxide based sol. The sensitive layers made by dip-coating from the carbonnanotubes modified tin sol have clearly shown the possibility of detecting various gases (ozoneand ammonia) at room temperature. This result is one the most important points of this work tothe extent that until now the chemical sensors based on tin dioxide only showed a high sensitivityto gases when they were operated at temperatures in the range of 350 - 400ºC. Concerning the twotarget gases tested in this work, the detection limit at room temperature was evaluated at 1 ppm inthe presence of NH3 and was lower than 20 ppb in the presence of ozone.The last part of this work has focused the optimization of the detection performance of thesensitive layers. In this case, the experimental study was oriented towards examination of theeffect of various parameters such as the amount of nanotubes in the hybrid material, thecalcination temperature of the sensitive layer, the sensor working temperature and also thephysico-chemical properties of the carbon nanotubes (synthesis method, diameter...) on thedetection efficiency of the sensing layers. The results obtained in terms of detection performancewere discussed in relation to the experimental parameters used
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Ghazaly, Christelle. "Développement d’un capteur spectrophotométrique pour la mesure en temps réel des expositions professionnelles à l’ozone." Electronic Thesis or Diss., Université de Lorraine, 2019. http://www.theses.fr/2019LORR0207.
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L’ozone provoque des maux de tête, des lésions pulmonaires et oculaires, ainsi que des maladies respiratoires graves telles que l'asthme. L’ozone est émis dans l’atmosphère des lieux de travail dans différents secteurs, notamment les imprimeries, les stations d’épuration des eaux, les ateliers de soudage à l’arc électrique et les industries de transformation des matières plastiques. L’exposition des salariés à des concentrations dépassant les valeurs limites d'exposition professionnelle (VLEP) nationales et européennes de l’ozone, fixées à 100 ppbv sur 8 heures et à 200 ppbv sur 15 minutes, peut provoquer des altérations sévères de la santé. Actuellement, la détermination des concentrations d’ozone dans l’air est réalisée à l’aide de tubes colorimétriques, assurant des mesures ponctuelles, ou en utilisant des capteurs commerciaux. Des études ont également été réalisées sur les capteurs, à base de cellules électrochimiques ou de semi-conducteurs et plus rarement sur des capteurs optiques. La limite de détection de ces capteurs est compatible avec les VLEP de l’ozone, mais ils sont fragiles et ne sont pas sélectifs. Il n’existe pour le moment aucune méthode de référence fiable et robuste pour l’évaluation des expositions professionnelles à l’ozone. L’objectif de cette étude est le développement d’une méthode de mesure en temps réel de l’ozone, qui soit caractérisée par un signal stable sous air, une sensibilité et une sélectivité élevée. Ce système de mesure doit permettre également d’identifier les phases les plus exposantes pour les salariés. Nous avons choisi la spectroscopie visible comme système de détection simple, rapide et précis. Nous avons élaboré avec succès le matériau sensible, basé sur un colorant peu coûteux, le bleu de méthylène, adsorbé sur un film mince de silice mésoporeuse déposé sur plaque de verre par dip-coating. Ce matériau est stable plus de 50 jours stocké sous air ambiant. Le système comprend également un tube de Nafion® ; utilisé afin de stabiliser le taux d’humidité relative de l’air. Le signal du capteur mesuré est la diminution d’absorbance à 600 nm. Cette diminution résulte de l’oxydation du colorant en présence d’ozone, et est irréversible sous air. Le capteur développé est caractérisé par une sensibilité aux faibles concentrations d’ozone allant de 10 à 500 ppbv, une cinétique de réponse reproductible et aucune interférence directe en présence de 500 ppbv de dioxyde d’azote. La dépendance à la température de la réponse du capteur est décrite. La performance de la détection pendant des scénarios d’exposition pendant des temps courts et à des concentrations variables est décrite. Le système élaboré pourrait servir de bon candidat pour la surveillance en temps réel des expositions professionnelles à l’ozone. Cette étape exigera une miniaturisation des différents composants du banc d’essais afin de pouvoir utiliser le capteur développé sur les lieux de travailOzone causes headaches, eye burns and lung damage and serious respiratory diseases such as asthma. Ozone is emitted into the atmosphere of workplaces in various sectors, including printing, water treatment, arc welding, and plastics processing. Exposure of workers to concentrations exceeding national and european ozone occupational exposure limit values (OELs), set at 100 ppbv over 8 hours and 200 ppbv over 15 minutes, may cause severe health alterations. Currently, the determination of ozone concentrations is carried out by using colorimetric tubes, providing spot measurements, or by using commercial sensors. Some studies were carried out on electrochemical cells or semiconductors based sensors and more rarely on optical sensors. The detection limit of these sensors is compatible with ozone OELs, but they are fragile and not selective. There is currently no reliable and robust reference method for the assessment of occupational exposures to ozone. The objective of this study is the development of a real-time ozone measurement method, which is characterized by a stable signal under air, high sensitivity, and selectivity. This measurement system must also make it possible to identify the most exposed phases for employees. We chose visible spectroscopy as a simple, fast and accurate detection system. We have successfully developed the sensitive material, based on an inexpensive dye, methylene blue, adsorbed on a thin film of mesoporous silica deposited on a glass plate by dip-coating. This material is stable for more than 50 days stored under ambient air. The system also includes a Nafion® tube; used to stabilize the relative humidity of the air. The measured sensor signal is the absorbance decrease at 600 nm. This reduction results from the oxidation of the dye in the presence of ozone and is irreversible under air. The developed sensor is characterized by sensitivity to low ozone concentrations ranging from 10 to 500 ppbv, reproducible response kinetics and no direct interference in the presence of 500 ppbv of nitrogen dioxide. The temperature dependence of the sensor response is described. The performance of the detection during exposure scenarios for short times and variable concentrations is described. The developed system could be a good candidate for real-time monitoring of occupational ozone exposures. This step will require miniaturization of the test bench components to use the sensor developed in the workplace
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Ouali, Hela. "Simulations numériques ab initio de l'adsorption de l'ozone O3 par des couches d'oxydes de cuivre CuxO pour une application capteurs de gaz." Thesis, Aix-Marseille, 2015. http://www.theses.fr/2015AIXM4380/document.
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Les équipes micro-capteurs (IM2NP) et capteurs de gaz (LMMA) développent des capteurs à base de couches minces de CuxO et étudient leurs réponses électriques sous O3. Les travaux de cette thèse ont pour but de mieux comprendre l’interaction solide-gaz à l’échelle atomique en simulant l’adsorption de l’O3 sur les surfaces (111) du CuO et du Cu2O. Pour cela nous avons utilisé la DF T (Density Functional Theory) dans le cadre de deux approximations de la fonctionnelle : la LDA (Local Density Approximation) et la GGA (Generalized Gradient Approximation).Pour le CuO, la correction de Hubbard (DF T + U) a été également prise en compte pour reproduire correctement les comportements semiconducteuret antiferromagnétique du matériau. Tous les calculs ont été menés avec le code SIESTA et montrent que pour les deux matériaux, l'ozone s’adsorbe sur la surface sans défauts, sans se dissocier, induisant un dopage p du matériau. Ceci est en accord avec la diminution de la résistance électrique mesurée expérimentalement sous ozone. Ensuite, l’ozone se dissocie en formant une molécule de O2 et un atome d’oxygène qui restent adsorbés. Cette étape ne semble pas modifier le dopage. Par contre lorsque le capteur n’est plus en présence d'O3, la molécule d’O2 désorbe et le dopage est annihilé. Dans ce mécanisme les énergies mises en jeu sont du même ordre de grandeur pour CuO ou pour Cu2O (allant de −3 eV à −1 eV). Dans l’objectif de développer un capteur de gaz, le CuO, plus facile à obtenir par les techniques de dépôt courantes en microélectronique, semble donc être plus pertinent que le Cu2O, qui a une réponse similaire (voire moindre) mais dont il est difficile d’obtenir une phase pureMicro-sensors (IM2NP) and gas sensors (LMMA) team develop sensors based on CuO and Cu2O thin layers and study their electrical responses to O3. The aim of this thesis is a better understanding of the solid-gas interactions at the atomic scale by simulating the adsorption of O3 molecule on the (111) surfaces of CuO and Cu2O. Simulations were performed using the DF T (Density Functional Theory) within two functional approximations : the LDA (Local Density Appriximation) and GGA (Generalized Gradient Approximation). In the case of CuO, the Hubbard correction (DF T + U) was taken into account to properly reproduce the semiconductor and antiferromagnetic behaviors of the material. All calculations were performed with the SIESTA code and show that for the CuO as for Cu2O, O3 is adsorbed on the defect-free surface, without dissociating inducing a p-doping of the material. This observation is consistent with the decrease in electrical resistance measured experimentally under ozone. In a second stage ozone dissociates into a molecule of O2 and an oxygen atom which remains adsorbed. This step does not appear to change the doping. However, when the sensor is no longer in the presence of ozone, O2 molecule is desorbed and doping disappears. In this mechanism, the energies involved during the adsorption or the dissociation of ozone are of the same order of magnitude for CuO or Cu2O (ranging from −1 eV to −3 eV). Aiming to develop a gas sensor, and since the CuO material is easier to obtain by standard deposition techniques (RF sputtering), it seems to be more appropriate than the Cu2O, which has a similar response (even lower) but is more difficult to synthesize in a pure phase
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Gaddari, Abdelhadi. "Nouvelle méthode d'élaboration par voie sol-gel des couches minces de dioxyde d'étain : Applications à la détection à température ambiante d'ozone et d'ammoniac." Phd thesis, Université de Franche-Comté, 2013. http://tel.archives-ouvertes.fr/tel-01020790.
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Les températures classiques de fonctionnement de la plupart des capteurs chimiques de gaz sont généralement supérieures à 300°C, ce qui ne représente pas les conditions favorables de leur fonctionnement en termes de stabilité, répétabilité et consommation énergétique. Pour ce, dans ce travail, nous avons développé une nouvelle méthode d'élaboration par voie sol-gel des couches minces à base de dioxyde d'étain(SnO2) sensibles à la détection de l'ozone et de l'ammoniac à température ambiante et à l'état de traces. L'ajustement des paramètres expérimentaux relatifs à ce procédé (solvant, concentration du dispersant, température et temps de recuit,...) a permis d'optimiser les conditions de préparation des couches minces et par la suite de contrôler les caractéristiques chimiques et texturales des couches sensibles développées. Dans cette étude les précurseurs du SnO2 ont été préparés selon deux approches.[...]Les résultats de détection de gaz ont montré qu'à l'inverse des couches élaborées par voie aqueuse qui sont quasiment insensibles à l'ozone, le procédé sol-gel en milieu alcoolique a permis de développer des couches très sensibles à ce gaz à des teneurs de l'ordre de 60 ppb, inférieures au seuil limite autorisé qui est de 75 ppb. L'originalité de ce travail porte sur le fait que les couches développées permettent la détection de O3 à température ambiante, ce dont aucune étude antérieure ne faisait état à l'origine de ce travail. Pour l'ammoniac, les deux voies de synthèse ont permis d'élaborer avec succès des capteurs sensibles à ce gaz, à température ambiante. La concentration minimale détectée de l'ordre de 5 ppm est inférieure aux 16,7 ppm correspondant au niveau maximum autorisé pour la détection olfactive par l'humain. Les performances de détection des deux gaz cibles, à température ambiante, ont été améliorées par addition dans les sols d'étain de surfactant (TX-100). En effet, les réponses des couches déposées en présence de surfactant ont été multipliées par un facteur 1,5 pour l'ozone et de 2 pour l'ammoniac, comparées avec celles des capteurs SnO2 sans additif.[...]
Book chapters on the topic "Ozone gas sensor"
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TAKADA, TADASHI. "Ozone Detection by ln2O3 Thin Film Gas Sensor." In Chemical Sensor Technology. Elsevier, 1989. http://dx.doi.org/10.1016/b978-0-444-98784-6.50009-x.
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Atkins, Peter. "Marriage Broking: Catalysis." In Reactions. Oxford University Press, 2011. http://dx.doi.org/10.1093/oso/9780199695126.003.0015.
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A ‘catalyst’ is a substance that increases the rate of a chemical reaction without itself being consumed. The Chinese characters for catalyst, which translate as ‘marriage broker’, convey the sense exactly. For instance, a huge advance in industrial chemistry was achieved early in the twentieth century when the German chemist Fritz Haber (1868–1934) found that nitrogen and hydrogen could be induced to combine to form ammonia, NH3, if the two gases were heated under pressure in the presence of iron. They hardly react at all if iron is not present. Haber’s achievement has helped to save the world, as well as contributing not a little to its destruction. Ammonia is of prime importance for the production of fertilizers, and through that application catalysis has helped to feed the world. Ammonia is also of prime importance for the manufacture of explosives, and through that application catalysis has taken away with that hand some of what the other hand has provided. The chemical industry could not function without catalysts as they enable reactions to occur at economically viable rates. They also enable some reactions to occur which in their absence would not occur at all. Catalysts are used to refine fuels, thus enabling transport. They are used in the manufacture of polymers, thus enabling the fabrication of so many of the artefacts of everyday life as well as the fabrics of fashion and furnishings. Without catalysts there would be very little of what we recognize as the familiar modern world. Our bodies also function under the control of catalysts. Biological catalysts are called enzymes, and I describe their function in Reaction 27. There are two broad classes of catalyst. A ‘heterogeneous catalyst’ is typically a solid and the reagents are liquids or gases that flow over the solid and react as they come into contact with it; this is the case with Haber’s catalyst. A ‘homogeneous catalyst’ is a gas or a substance that dissolves in a liquid reaction mixture. Anthropogenic (human-made) chorine atoms, perhaps from aerosol gases that have travelled up into the stratosphere, are homogeneous catalysts for the destruction of ozone.
Conference papers on the topic "Ozone gas sensor"
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Chelibanov, V. P., G. G. Ishanin, and L. N. Isaev. "Analyzer for measurement of nitrogen oxide concentration by ozone content reduction in gas using solid state chemiluminescent sensor." In SPIE Photonics Europe, edited by Francis Berghmans, Anna G. Mignani, and Piet De Moor. SPIE, 2014. http://dx.doi.org/10.1117/12.2049451.
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Meixner, D., C. D. Kohl, and T. Wagner. "E7.3 - Photonic metal oxide gas sensors: low temperature ozone sensing by cyclic optical excitation of In2O3." In AMA Conferences 2015. AMA Service GmbH, Von-Münchhausen-Str. 49, 31515 Wunstorf, Germany, 2015. http://dx.doi.org/10.5162/sensor2015/e7.3.
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Berger, Olena, Thomas Hoffmann, Wolf-Joachim Fischer, and Valeri Melev. "Influence of microstructure of tungsten oxide thin films on their general performance as ozone and NO x gas sensors." In Microtechnologies for the New Millennium 2003, edited by Jung-Chih Chiao, Vijay K. Varadan, and Carles Can. SPIE, 2003. http://dx.doi.org/10.1117/12.501930.
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Tariq, Hasan, and Farid Touati. "Environmentally-Powered WSN for Urban-Scale Mapping and Assessment of Air Quality in Qatar." In Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2020. http://dx.doi.org/10.29117/quarfe.2020.0056.
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Environmental monitoring has gained significant importance in outdoor air quality measurement and assessment for fundamental survival as well as ambient assisted living. In real-time outdoor urban scale, instantaneous air quality index estimation, the electrochemical sensors warm-up time, cross-sensitivity computation-error, geo-location typography, instantaneous capacity or back up time; and energy efficiency are the six major challenges. These challenges lead to real-time gradient anomalies that effect the accuracy and pro-longed lags in air quality index mapping campaigns for state and environmental/meteorological agencies. In this work, a gradient-aware, multi-variable air quality-sensing node is proposed with event-triggered sensing based on position, gas magnitudes, and cross-sensitivity interpolation. In this approach, temperature, humidity, pressure, geo-position, photovoltaic power, volatile organic compounds, particulate matter (2.5), ozone, Carbon mono-oxide, Nitrogen dioxide, and Sulphur dioxide are the principle variables. Results have shown that the proposed system optimized the real-time air quality monitoring for the chosen geo-spatial cluster (Qatar University).
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Brunet, J., J. P. Germain, A. Pauly, B. Lauron, and C. Varenne. "Methodology of Measurements for Phthalocyanine Gas Sensors Dedicated to the Detection of Ozone and Nitrogen Dioxide. Results in Urban Air Pollution Context." In Proceedings of the International Workshop on New Developments. WORLD SCIENTIFIC, 2003. http://dx.doi.org/10.1142/9789812704306_0035.
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