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Dissertations / Theses on the topic 'Semiconductor metal oxide gas sensors'

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Published: 4 June 2021
Last updated: 1 February 2022

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1

Barrett, Edward Patrick Stephen. "Aspects of the chemistry of metal oxide semiconductor gas sensors." Thesis, Brunel University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293023.

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2

Afonja, O. "Use of zeolites to effect discrimination in metal oxide semiconductor gas sensors." Thesis, University College London (University of London), 2013. http://discovery.ucl.ac.uk/1396988/.

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Composite zeolite-semiconducting metal oxide gas sensors have been produced using standard screen printing techniques. Zeolites A, ferrierite, ZSM-5, mordenite, ! and Y, in their acid form, have been incorporated as overlayers or admixtures (ZSM-5, mordenite and !) to tungsten trioxide (WO3) and titanium doped chromium oxide (CTO) thick films screen printed on interdigitated electrode substrates. These composite sensors, in addition to unmodified control sensors, were evaluated for selectivity to specific concentrations of CO, NH3, NO2 and C2 – C4 alkanes, alkenes and alcohols. A new gas sensi
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3

Abhijith, N. "Semi Conducting Metal Oxide Gas Sensors: Development And Related Instrumentation." Thesis, Indian Institute of Science, 2006. http://hdl.handle.net/2005/281.

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A sensor is a technological device or biological organ that detects, or senses, a signal or physical condition and chemical compounds. Technological developments in the recent decades have brought along with it several environmental problems and human safety issues to the fore. In today's world, therefore, sensors, which detect toxic and inflammable chemicals quickly, are necessary. Gas sensors which form a subclass of chemical sensors have found extensive applications in process control industries and environmental monitoring. The present thesis reports the attempt made in development of Zin
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4

Du, Xiaohua. "Understanding and optimization of gas sensors based on metal oxide semiconductors." Connect to online resource, 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3284441.

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5

Clavijo, William Paul. "Low-temperature Fabrication Process for Integrated High-Aspect Ratio Metal Oxide Nanostructure Semiconductor Gas Sensors." VCU Scholars Compass, 2017. http://scholarscompass.vcu.edu/etd/4781.

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This work presents a new low-temperature fabrication process of metal oxide nanostructures that allows high-aspect ratio zinc oxide (ZnO) and titanium dioxide (TiO2) nanowires and nanotubes to be readily integrated with microelectronic devices for sensor applications. This process relies on a new method of forming a close-packed array of self-assembled high-aspect-ratio nanopores in an anodized aluminum oxide (AAO) template in a thin (2.5 µm) aluminum film deposited on a silicon and lithium niobate substrate (LiNbO3). This technique is in sharp contrast to traditional free-standing thick film
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6

Newton, E. J. "Metal oxide semiconductor gas sensors as an electronic nose for the detection of microbial agents." Thesis, University College London (University of London), 2015. http://discovery.ucl.ac.uk/1461145/.

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The problem of rapid detection of bacteria for 'in-field' applications is addressed by way of a portable 'electronic nose' comprised of five metal oxide semiconductor (MOS) gas sensors in an array for the discrimination of volatile organic compounds (VOCs) associated with bacteria species such as Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus). A prototype portable sensor array unit (PSA unit) is presented capable of heating and taking measurements from five MOS gas sensors using a 7-volt power source. An array of five sensors based on zinc oxide (ZnO) is produced suitable for
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7

Ren, Huilin. "Current Voltage Characteristics of a Semiconductor Metal Oxide Sensor." Fogler Library, University of Maine, 2001. http://www.library.umaine.edu/theses/pdf/RenH2001.pdf.

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8

ZHANG, JIE. "INVESTIGATIONS OF OXIDE AND SULFIDE BASED LOW DIMENSIONAL NANO STRUCTURES FOR CONDUCTOMETRIC GAS SENSORS, MEMRISTORS AND PHOTODETECTORS." OpenSIUC, 2015. https://opensiuc.lib.siu.edu/dissertations/1086.

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Low dimensional semiconductors are promising materials with diverse range of applications in a variety of fields. Specifically, in recent times low dimensional oxide and sulfide based semiconductors are regarded as materials that can have potential applications in chemical gas sensor, optoelectronic devices and memristor. How ever, in some cases it is envisioned that appropriate doping as well as phase stabilization is important in enhancing their material properties. This work presents the synthesis, characterization and application of various (pristine and doped) quasi-one dimensional metal
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9

Bonanati, Peter [Verfasser]. "A parametrized numerical model to simulate the semiconductor influence of thick film metal oxide gas sensors / Peter Bonanati." Tübingen : Universitätsbibliothek Tübingen, 2020. http://d-nb.info/1220689831/34.

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10

Gibson, S. "Identification of the low temperature combustion products from coal and a study of their effect on metal oxide semiconductors." Thesis, Nottingham Trent University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233222.

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11

Leidinger, Martin Daniel [Verfasser], and Andreas [Akademischer Betreuer] Schütze. "Methods for increasing the sensing performance of metal oxide semiconductor gas sensors at ppb concentration levels / Martin Daniel Leidinger ; Betreuer: Andreas Schütze." Saarbrücken : Saarländische Universitäts- und Landesbibliothek, 2018. http://d-nb.info/1162892277/34.

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12

Rozštípil, Jakub. "Elektronický detektor pro tenkovrstvé mikrosenzory plynů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-217836.

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The general aim of Master’s thesis is to design and execute electronics in the SMT device view for thin film gas sensors and to study principle of gas sensor functionality based on semiconducting oxides. The SMT device contains temperature controller and electronics which is able to scan the concentration of gas on the sensor surface. It is designed for controlling of four sensors and has to communicate with computer for setting of initial conditions and scanning of concentration of gas. The practical part of Master’s thesis contains design and construction of electronics and software making.
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13

Shaposhnik, Dmitry. "Determination of hydrogen-containing gases in air with SnO2-based sensors." Doctoral thesis, Universitat Rovira i Virgili, 2015. http://hdl.handle.net/10803/368184.

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Methods of monodisperse SnO2 crystallites and SnO2-TiO2 composites synthesis were developed. Obtained materials were studied using SEM, TEM, FTIR, XRD methods. Sensors based on these materials were made, and their capability of detecting hydrogen in dry and humid air was investigated. Several different approaches to improvement of sensing devises characteristics were proposed in present study: doping of one metal oxide (SnO2) with another (TiO2) in different ways (mixing or co-precipitating); use of one-dimensional nanowire as a sensing element to detect H2S; application of reactor which con
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14

Steele, J. M. "Metal oxide single crystals as gas sensors." Thesis, University of Kent, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233273.

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15

Ash, Peter William. "Studies of tin oxide gas sensors for gas chromatographic detection." Thesis, University of Plymouth, 1990. http://hdl.handle.net/10026.1/2066.

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Gas sensitive semiconductors have been known for many years and applied in static gas alarm systems for the monitoring of hazardous gases, however, their application has been limited by a lack of selectivity. In this work a semiconducting gas sensor has been configured for use as a gas chromatographic detector thus combining the sensitivity of semiconductor sensors with the selectivity of gas chromatography. The study has been confined to tin oxide devices, more specifically the Taguchi gas sensor (TGS) . The majority of this work has concentrated on the TGS 813 although the use of other TGS i
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16

Chwieroth, Brian. "Design and modeling of metal oxide gas sensors /." The Ohio State University, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486397841222182.

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17

Shao, Feng. "New strategies in metal oxide nanowire based gas sensors." Doctoral thesis, Universitat de Barcelona, 2014. http://hdl.handle.net/10803/145058.

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This thesis presents the results of applying new strategies to understand the mechanism and explore the sensing performance of metal oxide (MOX) nanowire based gas sensors by testing individual nanowire gas sensors, running density functional theory (DFT) calculations, using new materials, applying ex-situ analysis and temperature-pulsed operation mode. These MOX nanowires include SnO2, CuO decorated SnO2, CuO and ZnO, electrically contacted either individually or in bundles. With SnO2-NH3 as a model system, DFT calculations were made to draw the pictures of surface-gas interactions, which
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18

Mohammed, K. A. "Studies of some metal phthalocyanines for gas sensor applications." Thesis, Lancaster University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381242.

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19

Walmsley, Anthony David. "The application of chemometrics for the development of metal oxide sensor arrays." Thesis, University of Greenwich, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294060.

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20

Sendi, Aymen. "Nez électronique communicant pour le contrôle de la qualité de l'air intérieur." Thesis, Toulouse 3, 2020. http://www.theses.fr/2020TOU30245.

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La mesure de la qualité de l'air intérieur est un besoin relativement récent. Les êtres humains passent plus de 90 % de leurs temps dans un environnement fermé (pièce intérieure) qui contient plusieurs polluants gazeux. L'existence de tels contaminants gazeux dans l'air intérieur d'une pièce fermée ainsi que l'exposition à court ou à long terme à ces polluants peuvent provoquer des problèmes respiratoires et plusieurs maladies chroniques. Des études montrent que la qualité de l'air intérieur a un impact direct sur le bien-être et la productivité d'une part et sur la santé à plus long terme, d'
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21

Almar, Liante Laura. "Ordered mesoporous metal oxides for solid oxide fuel cells and gas sensors." Doctoral thesis, Universitat de Barcelona, 2014. http://hdl.handle.net/10803/283997.

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Nanomaterials have received increasing attention during the last decades in the solid state field since they play a major role as catalyst and catalyst supports for many applications including fuel cells or gas sensors. The interest is mainly due to their high specific surface area, which leads to an increase of performance and a cost-effective solution for expensive or rare materials. However, many studies have reported the collapse of nanostructures at high temperature as one of the main drawbacks for their implementation in real devices and therefore, routes to thermally stabilize these mat
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22

Pugh, D. C. "Modified metal oxide gas sensors for the detection of clandestine chemistry locations." Thesis, University College London (University of London), 2018. http://discovery.ucl.ac.uk/10043630/.

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Clandestine laboratories are locations where chemistry is carried out in secret, often with the intent to produce illegal drugs or other controlled substances. These laboratories are unregulated and not maintained to a good laboratory standard, presenting a risk to first responders, bystanders and the environment. Electronic noses based on metal oxide semiconducting (MOS) gas sensors present a potential technology to create devices for the detection of clandestine activity. A range of sensors based on zinc oxide, chromium titanate and vanadium pentoxide have been manufactured and modified usin
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23

Naik, A. J. T. "Hetero-junction and nanomaterial systems for metal oxide semiconductor based gas sensing." Thesis, University College London (University of London), 2015. http://discovery.ucl.ac.uk/1463687/.

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Investigations into a number of hetero-junction and nanoceramic materials systems for metal oxide semiconductor (MOS) gas sensing for potential environmental and bio-sensing applications are presented. The hetero-junction study encompasses investigations into various composite n-n hetero-contact systems such as WO3-ZnO and SnO2-ZnO and a p-n hetero-contact system, specifically CTO (Chromium Titanium Oxide) - ZnO. The facile fabrication of various arrays of hetero-junction MOS gas sensor devices has been demonstrated. A simple change in the compositional contribution of an individual metal oxid
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24

Su, Haiqiao. "Gas Detection Applications of Vertically Aligned Metal Oxide Nanowire Arrays." ScholarWorks@UNO, 2014. http://scholarworks.uno.edu/td/1947.

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To build novel electronic noses for mimicking biological olfactory systems that consist of olfactory receptor arrays with large surface area and massively-diversified chemical reactivity, three dimensional (3D) vertical aligned ZnO nanowire arrays were employed as active materials for gas detection. ZnO nanowire arrays share 3D structures similar to mammalian olfactory receptor arrays, with thousands of vertical nanowires providing a high reception area which can significantly enhance the sensors’ sensitivity. Meanwhile, with different material decorations (such as SnO2, In2O3, WO3 and polymers
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25

Kukkola, J. (Jarmo). "Gas sensors based on nanostructured tungsten oxides." Doctoral thesis, Oulun yliopisto, 2013. http://urn.fi/urn:isbn:9789526202082.

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Abstract The aim of this thesis is to study whether nanostructured particles of WO3 could be competitive counterparts of traditional, more bulky materials in resistive gas sensor applications. Pristine and various surface decorated derivatives of three different types of WO3 nanoparticles applied on the surface of lithographically defined Si chips were used in the work to analyse the electrical behaviour of thin films when exposed to different gas atmospheres. Nanosized particles of WO3, obtained by capillary force-induced collapse of porous anodic tungsten oxide in water, were demonstrated as
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26

Fleischer, Stephen. "A study of gate-oxide leakage in MOS devices." Thesis, [Hong Kong : University of Hong Kong], 1993. http://sunzi.lib.hku.hk/hkuto/record.jsp?B1364600X.

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27

Khunou, Ramotseng. "Gas sensing properties of Ceo2 nanostructures." University of the Western Cape, 2020. http://hdl.handle.net/11394/7909.

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>Magister Scientiae - MSc<br>The industrial safety requirements and environmental pollution have created a high demand to develop gas sensors to monitor combustible and toxic gases. As per specifications of World Health Organization (WHO) and Occupational Safety and Health Administration (OSHA), lengthy exposure to these gases lead to death which can be avoided with early detection. Semiconductor metal oxide (SMO) has been utilized as sensor for several decades. In recent years, there have been extensive investigations of nanoscale semiconductor gas sensor.
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28

Haapalainen, T. (Tomi). "Gas response properties of metal oxide nanoparticle based sensors on MEMS microhotplate platforms." Master's thesis, University of Oulu, 2015. http://jultika.oulu.fi/Record/nbnfioulu-201509031953.

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Abstract. This thesis concentrated on the analysis of the gas response properties of several metal oxide based gas sensors. A thin layer of chosen metal oxide was deposited on SGX Sensortech S.A. sensor platforms using pulsed laser deposition (PLD). Metal oxides used in the studies included tungsten trioxide (WO₃3), tin oxide zinc oxide (SnO₂-ZnO) and vanadium pentoxide (V₂O₅). The films were deposited at room temperature and various oxygen partial pressures, and were then post-annealed at 400 °C. Gas response measurements were done in two different temperatures and using several gases includi
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29

Roso, Casares Sergio. "Synthesis and gas sensing properties of single crystalline metal-oxide nanostructures." Doctoral thesis, Universitat Rovira i Virgili, 2017. http://hdl.handle.net/10803/402468.

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A la present tesis doctoral, s'han produït diferents tipus de nanoestructures basades en òxids metàl·lics, com per exemple nanofils de ZnO i octaedros d'In2O3, utilitzant el mètode de Deposició Química de Vapor (CVD) a altes temperatures. Per a la detecció d'òxid de nitrogen, s'ha descobert que la resposta dels nanofils d'ZnO està directament relacionada amb la quantitat de defectes presents en el material. Com més gran es el nombre de defectes, major és la resposta al diòxid de nitrogen. Tanmateix, per a la detecció d'etanol, la mostra que contenia un nombre mig de defectes, va ser la que dó
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30

Chen, Jiajun. "Highly Sensitive and Selective Gas Sensors Based on Vertically Aligned Metal Oxide Nanowire Arrays." ScholarWorks@UNO, 2010. http://scholarworks.uno.edu/td/106.

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Mimicking the biological olfactory systems that consist of olfactory receptor arrays with large surface area and massively-diversified chemical reactivity, three dimensional (3D) metal oxide nanowire arrays were used as the active materials for gas detection. Metal oxide nanowire arrays share similar 3D structures as the array of mammal's olfactory receptors and the chemical reactivity of nanowire array can be modified by surface coatings. In this dissertation, two standalone gas sensors based on metal oxide nanowire arrays prepared by microfabrication and in-situ micromanipulation, respective
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31

Laminack, William I. "Characterization of functionalized and unfuctionalized metal oxide nanoparticle interactions with gas mixtures on porous silicon." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53877.

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In order to create more sensitive and accurate gas sensors, we have studied the interactions of gas mixtures on metal oxide nanoparticle decorated porous silicon interfaces. The nanoparticles control the magnitude and direction of electron transduction from the interaction of analyte gases to an extrinsic porous silicon semiconductor. These interactions can be predicted by the Inverse Hard Soft Acid Base (IHSAB) principle. Moreover, the metal oxide nanoparticles can be functionalized with nitrogen and sulfur, modifying the oxide’s band structure. These modifications are demonstrated t
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32

Tarttelin, Hernandez P. "Modification of n-type and p-type metal oxide semiconductor systems for gas sensing applications." Thesis, University College London (University of London), 2017. http://discovery.ucl.ac.uk/1549841/.

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This thesis investigates the modification of three metal oxide semiconductor gas sensors with zeolite materials for the purposes of detecting trace concentrations of gases that have an effect on health, security, safety and the environment. SnO2, Cr2O3 and Fe2O3 were chosen as the base materials of interest. Zeolites HZSM- 5, Na-A and H-Y were incorporated into the sensing system either as admixtures with the base material or as coatings on top of it. The aim of introducing zeolites into the sensing system was to improve the performance of the otherwise unmodified sensors. Twenty-two novel zeo
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33

Saha, Tanmoy. "Design, fabrication, and complementary metal-oxide- semiconductor (CMOS) integration of micro-electro- mechanical systems (MEMS) humidity sensors." Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=114228.

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The design, microfabrication, and CMOS integration of micro-electro-mechanical systems (MEMS) capacitive humidity sensors are presented in this work. Theoretical analysis and simulations were done to understand how sensor performance can be optimized. While CoventorWare was used for steady-state simulations, a MATLAB simulation model, based on the mathematics of moisture adsorption and diffusion, was developed for dynamic simulations. The sensors were fabricated using a process flow that has a low thermal budget (≤ 300 ○C), as well as material and chemical compatibility with IC fabrication, al
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34

Pashami, Sepideh. "Change detection in metal oxide gas sensor signals for open sampling systems." Doctoral thesis, Örebro universitet, Institutionen för naturvetenskap och teknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-46845.

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This thesis addresses the problem of detecting changes in the activity of a distant gas source from the response of an array of metal oxide (MOX) gas sensors deployed in an Open Sampling System (OSS). Changes can occur due to gas source activity such as a sudden alteration in concentration or due to exposure to a different compound. Applications such as gas-leak detection in mines or large-scale pollution monitoring can benefit from reliable change detection algorithms, especially where it is impractical to continuously store or transfer sensor readings, or where reliable calibration is diffic
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35

Simon, Isolde [Verfasser]. "Thermal Conductivity and Metal Oxide Gas Sensors : Micromachining as an Opportunity to Improve Sensor Performance / Isolde Simon." Aachen : Shaker, 2004. http://d-nb.info/1172610428/34.

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36

Calavia, Boldú Raúl. "Gas sensor microsystems based on nanostructured layers via anodic oxidation." Doctoral thesis, Universitat Rovira i Virgili, 2012. http://hdl.handle.net/10803/96314.

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En aquesta tesi es detalla la metodologia per obtindre sensors de gasos basats en òxid de tungstè nanoestructurat sobre suports micromecanitzats de silici. Aquesta nanoestructuració s’ha fet mitjançant una capa d’alúmina porosa como a motlle, pel que s’ha desenvolupat una metodologia per a compatibilitzar l'anodització de l’alumini, i altres metalls com el tungstè, amb els processos estàndards del silici. S’han desenvolupat dos tipus de capes nanoestructurades, nanotubs i nanopunts de WO3. Els nanotubs s’han obtingut depositant mitjançant polvorització catòdica reactiva la capa sensible sobre
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37

Kandasamy, Sasikaran, and s3003480@student rmit edu au. "Investigation of SiC Based Field Effect Sensors with Gas Sensitive Metal Oxide Layers for Hydrogen and Hydrocarbon Gas Sensing at High Temperatures." RMIT University. Electrical and Computer Engineering, 2008. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080724.142015.

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This PhD thesis sets out to investigate novel Silicon Carbide (SiC) based field effect devices (Schottky and transistor structures), with gas sensitive layers for monitoring hydrogen and propene gases at high temperatures. The devices developed by the author were shown to exhibit sensitivities at least 1~2 orders of magnitude (voltage shift, ĢV) higher than those reported in literature. Not only did the author seek to investigate the gas sensing potential of such devices, but also he set out to study, analyse and establish the gas interaction mechanism of these novel sensors. High temper
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38

Simo, Aline. "Physical properties of vanadium dioxide nanoparticles: application as 1-d nanobelts room temperature for hydrogen gas sensing." Thesis, University of the Western Cape, 2013. http://hdl.handle.net/11394/4581.

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Philosophiae Doctor - PhD<br>Transition metal oxides magneli phases present crystallographic shear structure which is of great interest in multiple applications because of their wide range of valence, which is exhibited by the transition metals. The latter affect chemical and physical properties of the oxides. Amongst them we have nanostructures VO2 system of V and O components which are studied including chemical and physical reactions based on non-equilibrium thermodynamics. Due to their structural classes of corundum, rocksalt, wurtzite, spinel, perovskite, rutile, and layer structure, thes
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39

Vergara, Tinoco Alexander. "Improving the performance of micro-machined metal oxide gas sensors: Optimization of the temperatura modulation mode via pseudorandom sequences." Doctoral thesis, Universitat Rovira i Virgili, 2006. http://hdl.handle.net/10803/8456.

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Un dels majors problemes experimentats pels sistemes de detecció de gasos basats en sensors d'òxids metàl·lics és la seva manca de reproduibilitat, estabilitat i selectivitat. A fi i a efecte d'intentar resoldre aquest problemes, diferents estratègies han estat desenvolupades en paral·lel. Algunes es relacionen a la millora dels materials i d'altres impliquen el condicionament o el pre-tractament de les mostres. Les més emprades han consistit en aprofitar que els sensors presenten sensibilitats solapades per construir matrius de sensors i emprar tècniques de processament del senyal o bé utilit
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40

Staerz, Anna [Verfasser], and Udo [Akademischer Betreuer] Weimar. "Methods for Expanding the Diversity in the Response of Metal Oxide Based Gas Sensors / Anna Staerz ; Betreuer: Udo Weimar." Tübingen : Universitätsbibliothek Tübingen, 2020. http://d-nb.info/1211343804/34.

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41

Hübner, Michael [Verfasser]. "New Approaches for the Basic Understanding of Semiconducting Metal Oxide Based Gas Sensors: Sensing, Transduction and Appropriate Modeling / Michael Hübner." Aachen : Shaker, 2012. http://d-nb.info/1069046884/34.

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42

Greig, Thomas Alexander. "Development of CMOS active pixel sensors." Thesis, Brunel University, 2008. http://bura.brunel.ac.uk/handle/2438/5345.

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This thesis describes an investigation into the suitability of complementary metal oxide semiconductor (CMOS) active pixel sensor (APS) devices for scientific imaging applications. CMOS APS offer a number of advantages over the established charge-coupled device (CCD) technology, primarily in the areas of low power consumption, high-speed parallel readout and random (X-Y) addressing, increased system integration and improved radiation hardness. The investigation used a range of newly designed Test Structures in conjunction with a range of custom developed test equipment to characterise device p
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43

Rebholz, Julia Margarete [Verfasser]. "Influence of Conduction Mechanism Changes and Related Effects on the Sensing Performance of Metal Oxide Based Gas Sensors / Julia Margarete Rebholz." Aachen : Shaker, 2016. http://d-nb.info/1120864380/34.

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44

Rebholz, Julia [Verfasser]. "Influence of Conduction Mechanism Changes and Related Effects on the Sensing Performance of Metal Oxide Based Gas Sensors / Julia Margarete Rebholz." Aachen : Shaker, 2016. http://nbn-resolving.de/urn:nbn:de:101:1-201612041747.

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45

Klofta, Thomas James. "THE MODIFICATION OF ELECTROCHEMICAL AND PHOTOELECTROCHEMICAL PROPERTIES IN THIN FILMS OF TRI- AND TETRAVALENT METAL PHTHALOCYANINES (GAS SENSORS, PHOTOVOLTAICS, ORGANIC SEMICONDUCTOR(S))." Diss., The University of Arizona, 1986. http://hdl.handle.net/10150/183820.

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Four different trivalent and tetravalent metal phthalocyanine systems (chlorogallium, chloroindium, vanadyl, and titanyl phthalocyanines) were used singly to prepare thin films (0.05-2.0 micron thickness) on gold, optically transparent substrates. The photoelectronic properties of these electrodes could be modified either by altering the growth conditions (i.e. rate of sublimation, cleanliness of substrate) or by dosing the thin films with either hydrogen or oxygen at elevated temperatures (150°C). The properties of these thin films were monitored by electron microscopy, UV-visible spectrophot
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46

Kurbanoglu, Basak. "Dynamic Resistivity Behavior Of Tin Oxide Based Multilayer Thin Films Under Reducing Conditions." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607051/index.pdf.

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Effects of urban air pollution on health and environment have lead researchers to find economic air quality monitoring regulations. Since tin dioxide (SnO2) was demonstrated as a gas sensing device in 1962, tin oxide based thin film sensors have been widely studied due to their high sensitivity and fast response. The main advantages of using tin oxide sensors are their low cost, small size and low power consumption for mobile system applications. But, in order SnO2 based sensors to meet low concentration of gases they should be highly upgraded in sensitivity, selectivity and stability. This st
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47

Pytlíček, Zdeněk. "Mikrosenzory plynů založené na samouspořádaných 3D nanovrstvách oxidů kovů." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-263354.

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This dissertation concerns the development, fabrication and integration in a gas sensing microdevice of a novel 3-dimensional (3D) nanostructured metal-oxide semiconducting film that effectively merges the benefits of inorganic nanomaterials with the simplicity offered by non-lithographic electrochemistry-based preparation techniques. The film is synthesized via the porous-anodic-alumina-assisted anodizing of an Al/Nb metal bilayer sputter-deposited on a SiO2/Si substrate and is basically composed of a 200 nm thick NbO2 layer holding an array of upright-standing spatially separated Nb2O5 nanoc
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48

Bukauskas, Virginijus. "Application of scanning probe microscopy for development and investigation of gas sensitive nanosystems and hybrid structures integrated with the ultra-thin metal oxide." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2010. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2010~D_20101001_150357-00098.

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Modification of the properties of solid state structures, used for gas sensing is important task in making detection and measurement systems of volatile chemical compounds. These properties depend on material, inner structure and interaction with gas atmosphere. In hybrid materials (solid-biomolecular) biochemical recognition plays important role in gas sensing mechanism. In this work the methodologies of the SPM was applied for characterization of the local point and local area properties in the gas sensitive MO films with the nanoscaled thickness that can be used for nanosystems and hybrid m
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49

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
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50

Venter, Johan H. "Dynamic range and sensitivity improvement of infrared detectors using BiCMOS technology." Diss., University of Pretoria, 2013. http://hdl.handle.net/2263/25267.

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The field of infrared (IR) detector technology has shown vast improvements in terms of speed and performance over the years. Specifically the dynamic range (DR) and sensitivity of detectors showed significant improvements. The most commonly used technique of implementing these IR detectors is the use of charge-coupled devices (CCD). Recent developments show that the newly investigated bipolar complementary metal-oxide semiconductor (BiCMOS) devices in the field of detector technology are capable of producing similar quality detectors at a fraction of the cost. Prototyping is usually performed
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