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Dissertations / Theses on the topic 'Gas sensing system'

Author: Grafiati

Published: 11 December 2022

Last updated: 31 July 2025

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1

Rogge, Matthew Douglas. "In-process sensing of weld penetration depth using non-contact laser ultrasound system." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/31698.

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Thesis (Ph.D)--Mechanical Engineering, Georgia Institute of Technology, 2010.<br>Committee Chair: Ume, Charles; Committee Member: Chen, Ye-Hwa; Committee Member: Michaels, Jennifer; Committee Member: Sadegh, Nader; Committee Member: Vachtsevanos, George. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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Malaver, Rojas Jairo Alexander. "Development of gas sensing technology for ground and airborne applications powered by solar energy : methodology and experimental results." Thesis, Queensland University of Technology, 2014. https://eprints.qut.edu.au/74644/1/74644.pdf.

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Monitoring gases for environmental, industrial and agricultural fields is a demanding task that requires long periods of observation, large quantity of sensors, data management, high temporal and spatial resolution, long term stability, recalibration procedures, computational resources, and energy availability. Wireless Sensor Networks (WSNs) and Unmanned Aerial Vehicles (UAVs) are currently representing the best alternative to monitor large, remote, and difficult access areas, as these technologies have the possibility of carrying specialised gas sensing systems, and offer the possibility

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Meesala, Vamsi Chandra. "Modeling and Analysis of a Cantilever Beam Tip Mass System." Thesis, Virginia Tech, 2018. http://hdl.handle.net/10919/83378.

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We model the nonlinear dynamics of a cantilever beam with tip mass system subjected to different excitation and exploit the nonlinear behavior to perform sensitivity analysis and propose a parameter identification scheme for nonlinear piezoelectric coefficients. First, the distributed parameter governing equations taking into consideration the nonlinear boundary conditions of a cantilever beam with a tip mass subjected to principal parametric excitation are developed using generalized Hamilton's principle. Using a Galerkin's discretization scheme, the discretized equation for the first mode i

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Sher, Rabnawaz Jan. "Classification of a Sensor Signal Attained By Exposure to a Complex Gas Mixture." Thesis, Linköpings universitet, Statistik och maskininlärning, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-172769.

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This thesis is carried out in collaboration with a private company, DANSiC AB This study is an extension of a research work started by DANSiC AB in 2019 to classify a source. This study is about classifying a source into two classes with the sensitivity of one source higher than the other as one source has greater importance. The data provided for this thesis is based on sensor measurements on different temperature cycles. The data is high-dimensional and is expected to have a drift in measurements. Principal component analysis (PCA) is used for dimensionality reduction. “Differential”, “Relat

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Chmela, Ondřej. "POKROK VE VÝVOJI SNÍMACÍCH POLÍ ZALOŽENÝCH NA JEDNOM NANODRÁTU A JEJICH VYUŽITÍ V OBLASTI DETEKCE PLYNŮ." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2019. http://www.nusl.cz/ntk/nusl-408055.

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Tato práce se zabývá vývojem platforem na bázi křemíkového substrátu pro selektivní integraci polovodivých nanostruktur oxidu kovu (MOX) a jejich použití v perspektivních mobilních zařízeních jako vysoce citlivé a selektivní prvky pro detekci analytů plynů. Polovodičové nanostruktury MOX, například nanodráty, prokázaly lepší schopnosti pro snímání plynů včetně citlivosti, stability a do jisté míry také selektivity, ve srovnání s jejich protějšky na bázi vrstev. Rovněž použití jednoho (nebo několika) nanodrátů zapojených paralelně se ukázalo jako ideální architektura pro dosažení dobře definova

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Lowery, Paul. "Information processing in multi sensor systems." Thesis, University of Derby, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.322505.

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Hustler, Glenn. "Formation kinetics and gas sensing behaviour of selected cuprate semiconductors." Thesis, Manchester Metropolitan University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364081.

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8

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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Foo, James. "Laser absorption spectroscopy and tomography of gas flows." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/laser-absorption-spectroscopy-and-tomography-of-gas-flows(47a30c34-4290-4b28-bcb4-bbfa94cc5859).html.

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This research focuses on developing optical sensing systems for 2D and 3D spatial monitoring of temperature and concentration distribution profiles of complex or reacting gas flows. Non-invasive, species specific and sensitive nature of monitoring allows spatial information to be extracted from harsh environments with poor physical access, allowing validation of computational models or process monitoring. This is suitable for processes like combustion engines or sealed atmospheric cloud chambers. A novel line-of-sight (LOS) Tunable Diode Laser Absorption Spectroscopy(TDLAS) system using a pres

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Inglés, Bort Roser. "Modelization, simulation and design of micro-electro-mechanicazed systems (mems) preconcentrators for gas sensing." Doctoral thesis, Universitat Rovira i Virgili, 2010. http://hdl.handle.net/10803/8483.

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Hoy en día, la normativa sobre gases que son tóxicos a muy bajas concentraciones se está haciendo muy estricta. Por esta razón, los dispositivos como los preconcentradores que permiten la detección de estos gases a bajas concentraciones se están investigando cada vez más.<br/><br/>En esta tesis se hace un estudio sobre preconcentradores planos fabricados en silicio, con la idea de poder integrarlos con el sistema sensor. Estos preconcentradores se han simulado para comprender mejor su funcionamiento. Se ha hecho un estudio para conseguir una óptima homogenización de temperatura en el área cal

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Behera, Bhagaban. "Synthesis and characterization of nanostructured metal oxides and their integration in mems technology for gas sensing applications." Thesis, IIT Delhi, 2016. http://localhost:8080/iit/handle/2074/6982.

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Mohammadi, Saeed. "Phononic band gap micro/nano-mechanical structures for wireless communications and sensing applications." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/41069.

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Because of their outstanding characteristics, micro/nano-mechanical (MM) structures have found a plethora of applications in wireless communications and sensing. Many of these MM structures utilize mechanical vibrations (or phonons) at megahertz or gigahertz frequencies for their operation. On the other hand, the periodic atomic structure of crystals is the fundamental phenomenon behind the new era of electronics technology. Such atomic arrangements lead to a periodic electric potential that modifies the propagation of electrons in the crystals. In some crystals, e.g. silicon (Si), this modif

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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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Wilson, Cortney E. "A Tale of Two Theories: Using an Engineered Strain of E. coli to Bridge the Gap Between Quorum Sensing and Diffusion Sensing." NSUWorks, 2016. http://nsuworks.nova.edu/occ_stuetd/411.

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Cooperation is a trait that is found at all levels of biological organization. Interestingly, cooperation appears to occur in bacteria that produce small, easily diffusible molecules called autoinducers. To understand why bacteria produce these autoinducers, the scientific community has focused on one predominant theory called quorum sensing. Under this theory, bacteria produce autoinducers so they can sense the density of the population. Once a sufficiently high population density is reached, autoinducers initiate the production of a costly gene product that serves to benefit the population.

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Batet, Torrell Óscar. "Investigation of continuous-wave range-resolved lidar systems for gas detection and concentration measurement." Doctoral thesis, Universitat Politècnica de Catalunya, 2011. http://hdl.handle.net/10803/471533.

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The techniques for detection of the atmosphere constituents and their distribution in the space have evolved in the last years driven by needs in the environmental, meteorological and climate science fields and backed by technological developments. The study of the atmosphere behavior, the health risks provoked either by natural or man-made phenomena or the study of the climate change are examples of applications of optical remote sensing techniques that tend to increase as time goes by. This thesis presents an innovative lidar system for gas detection with range resolution and moderate cos

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Leblanc, Marc. "The use of remote sensing and GIS for water resources management of large semi-arid regions : a case study of the Lake Chad Basin, Africa." Thesis, University of South Wales, 2002. https://pure.southwales.ac.uk/en/studentthesis/the-use-of-remote-sensing-and-gis-for-water-resources-management-in-large-semiarid-regions(60355d56-d7d4-4373-bb4b-3eb7395126ab).html.

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This project investigates applications of GIS and remote sensing to advance the hydrological understanding and improve the management of the water resources in large semi-arid regions. In the Lake Chad Basin, Africa, it is demonstrated how remotely sensed data can contribute significantly to a groundwater problem, something which historically has not often been achieved, particularly in semi-arid areas. In semi-arid areas, water is scarce and groundwater is often the only perennial resource available for the population. In the central part of Lake Chad Basin, this study focuses on the Quaterna

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Williams, Jeremy Hugh. "Monitoring the condition of semi-natural vegetation : the application of remote sensing and geographical information systems (GIS)." Thesis, Bangor University, 1992. https://research.bangor.ac.uk/portal/en/theses/monitoring-the-condition-of-seminatural-vegetation--the-application-of-remote-sensing-and-geographical-information-systems-gis(c90702cb-be4f-454f-aba1-1c74484c0093).html.

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The principal objective of this thesis was to investigate the use of remote sensing and Geographical Information System (GIS) technology in the survey and monitoring of semi-natural, vegetation. The effects of acidic deposition and airborne pollutants on vegetation were of particular interest during the 1980s and early 1990s. A first experiment studied the effect of simulated acid rain on the reflectance of birch seedlings. Plants exposed to acidic treatments lost the characteristic reflectance curve shape of healthy green vegetation. Spectroradiometer data were used to discriminate between pl

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De, Rosa Daniele. "Optimizing the use of organic amendments in sub-tropical vegetable cropping systems for improved environmental and agronomic outcomes." Thesis, Queensland University of Technology, 2017. https://eprints.qut.edu.au/112419/1/Daniele_De%20Rosa_Thesis.pdf.

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This study aimed to improve the efficiency of the use of organic amendments as a valid substitute for chemical nitrogen fertilizer in sub-tropical vegetable cropping systems. The results proved that predicting and accounting for the nitrogen release from organic amendments offers significant potential agronomic and environmental advantages by maintaining soil fertility and reducing the chemical nitrogen use.

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Sewe, Maquins Odhiambo. "Towards Climate Based Early Warning and Response Systems for Malaria." Doctoral thesis, Umeå universitet, Epidemiologi och global hälsa, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-130169.

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Background: Great strides have been made in combating malaria, however, the indicators in sub Saharan Africa still do not show promise for elimination in the near future as malaria infections still result in high morbidity and mortality among children. The abundance of the malaria-transmitting mosquito vectors in these regions are driven by climate suitability. In order to achieve malaria elimination by 2030, strengthening of surveillance systems have been advocated. Based on malaria surveillance and climate monitoring, forecasting models may be developed for early warnings. Therefore, in this

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Keller, Cherie A. "Assessment of Resource Selection Using Remote Sensing and Geographic Information Systems (GIS) for Two Vertebrates in Disparate Habitats: the Gopher Tortoise (Gopherus Polyphemus) and the North Atlantic Right Whale (Eubalaena Glacialis)." [Tampa, Fla.] : University of South Florida, 2005. http://purl.fcla.edu/fcla/etd/SFE0001279.

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Mounir, Adil. "Development of a Reservoir System Operation Model for Water Sustainability in the Yaqui River Basin." Ohio University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1513880139368117.

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Kuo, Tsung-Wei, and 郭宗瑋. "Portable Low Concentration Acetone Gas Sensing System." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/385mt6.

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碩士<br>國立中興大學<br>機械工程學系所<br>106<br>The acetone gas is closely related to human’s health. This study has finished the design and fabrication of a portable low concentration acetone gas sensing system. It’s can detect the concentration of acetone which contained inside human’s breath conveniently. The system contains a monitor module, a portable chamber, an air-storage chamber, sensor module. The system can measure acetone concentration through converting the resistance changing of the sensor module into the output signal. The resolution of the sensor achieves 0.5 ppm. The chambers of the system

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Lee, Yang Che, and 李仰哲. "Sensing System Design for Detecting Amine-based Gas." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/j7b346.

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碩士<br>國立清華大學<br>電子工程研究所<br>104<br>We use P3HT act as sensing material and product a vertical pillar-like structure diode by blade coating process to detect the concentration of ammonia. When the ammonia flows into the sensing system, the ammonia molecular will be trapped by the sensing materials to reduce the current of diode. As the ammonia flows out of the sensing system, the current will recover to the original value. And then we can use the two current values to calculate the response of the ammonia. Furthermore, the response of the bag which is filled with dry air can estimate the concent

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Chen, Kai-Jyun, and 陳凱駿. "CO2 Gas Sensing System with Multi-wavelength Detection." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/44011976249265622365.

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碩士<br>國立臺灣大學<br>光電工程學研究所<br>103<br>In this thesis, the CO2 gas sensing system with multi-wavelength detection is demonstrated by means of narrow bandwidth triple-wavelength thermal emitter and corresponding narrow bandwidth plasmonic photodetectors. In addition to detecting the two absorption of CO2 in mid-infrared spectrum, a reference signal which would not be absorbed by CO2 makes the whole system more reliable and can be used to calibrate the variation of the emitter. Firstly, an Au/SiO2/Au grating structure with two widths is fabricated on top of a waveguide mode thermal emitter with ran

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Cheng, Chi-Chung, and 鄭棨中. "Investigation of Energy Saving Hydrogen Gas Sensing System." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/37114462554120653691.

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碩士<br>朝陽科技大學<br>資訊工程系碩士班<br>101<br>Sensors based on semiconductor-type have been widely used in environmental detecting due to its advantages of small size and high sensing sensitivity. For the reasons of safety and accuracy, multi-point sensors are required. Hence, the sensing data become huge from detecting note to the collection terminal. It’s doubt whether the sensing data will be lost especially in wireless transmission. To overcome this drawback, reduce redundant data for transmission and data restoration by interpolation were used to build the sensing system without distortion. In the a

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Chao, Je-Shin, and 趙哲新. "Gas sensing system based on surface acoustic wave array." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/11609080902735621532.

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Chao, Kuan-Ting, and 趙冠庭. "Study on IoT-aided intelligent wireless gas sensing system." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/91919431869436076232.

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碩士<br>國立臺灣師範大學<br>機電工程學系<br>104<br>In this thesis, a wireless gas sensing network is established under the environment of the internet of things based on the device smartphone central processing system (DSC), such that it can serve as an intelligent mobile wireless measurement network for the detection and identification of unknown gases. Moreover, the wireless remote control for an automatic analysis and an isokinetic sampling equipment for the data transmission are discussed; thus, a mobile device is employed for the wireless transmission to achieve the remote manipulation and transmission.

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Shen, Ming-Chih, and 申明智. "Surface acoustic wave sensing system for explosive gas recognition." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/z33v6w.

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碩士<br>中原大學<br>電子工程研究所<br>106<br>Surface acoustic wave (SAW) device has been applied as an important sensor in home environment monitor, industrial environment safety monitor, food quality identification and personal health control. Moreover, quartz surface acoustic wave device has many advantages such as: high sensitivity, high reliability, small module size and low cost. Because the surface acoustic wave devices are very sensitive and compact in size, they have been widely used in many sensing applications. For rapidly sensing different organic vapors, in the paper, we develop a compact gas c

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Sapsanis, Christos. "Capacitive Structures for Gas and Biological Sensing." Thesis, 2015. http://hdl.handle.net/10754/550470.

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The semiconductor industry was benefited by the advances in technology in the last decades. This fact has an impact on the sensors field, where the simple transducer was evolved into smart miniaturized multi-functional microsystems. However, commercially available gas and biological sensors are mostly bulky, expensive, and power-hungry, which act as obstacles to mass use. The aim of this work is gas and biological sensing using capacitive structures. Capacitive sensors were selected due to its design simplicity, low fabrication cost, and no DC power consumption. In the first part, the domi

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Wu, Chin-Cheng, and 吳晉晟. "Development of Wireless and Wearable Miniature Chemiresistive Gas Sensing System." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/ddeswy.

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博士<br>國立交通大學<br>電機工程學系<br>107<br>This study proposed a wireless and wearable miniature chemiresistive gas sensing system based on polymer/multi-walled carbon nanotube composite thin film. The system equipped with an optimized micro-thermostat could improve the effect of temperature on polymer based gas sensor. According to the sensor response, the operating temperature at 40 ℃ could provide the proposed gas sensing system better sensitivity and minimized power consumption. The wearable miniature chemiresistive gas sensing system equipped eight gas sensing interdigitated electrodes and integrat

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Lo, Jing-Pin, and 羅京聘. "High-Selectivity Multiple-Gas Sensing Module for Wireless Sensor Network System." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/10762217967315261799.

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碩士<br>國立臺灣大學<br>電子工程學研究所<br>97<br>Home Safety has always been one of the objectives pursued. With the advances in technology and sensor technology, people at any time to monitor changes in the environment around them and make up with contingency measures in a timely manner to prevent disasters from happening. For example, in the life of the gas is one of the important energy and cooking or day-to-day use of hot water. However, that neglect could cause carbon monoxide poisoning or gas explosion incident. Therefore, how we can make good use of the gas sensing system to provide real-time early wa

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Lu, Chia-Ning, and 魯家寧. "Sensing mechanism and development of conducting polyaniline gas sensor and system." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/39120359220206407229.

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碩士<br>臺灣大學<br>電子工程學研究所<br>98<br>Nowadays, for the demand of comfortable and safe environment, the development of gas sensor is heading for reducing the volume and achieving the micro portable system. Furthermore, the gas sensor needs to achieve the low power and precise measurement in the future. In so many gas sensing materials, conducting polyaniline gas sensing material is attached importance because it can be manufacturing for the small area sensing electrode and portable gas sensing system. The sensing mechanism of conducting polyaniline(PANI) is making use of the conductivity change when

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Tsai, Chun-Yen, and 蔡淳言. "Gas Sensing System Based on Direct Absorption and Wavelength Modulation Spectroscopy." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/hf7xq4.

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YU, JIA-HAO, and 余佳豪. "Fabrication of an UV-light pulsed portable system for sensing NO2 gas." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/u2wp5m.

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碩士<br>中國文化大學<br>化學系應用化學碩士班<br>107<br>A portable NO2 gas sensing system in periodically UV-light pulsed operation mode was fabricated for application in sensing exhaust gas from a motorcycle. The portable gas-sensing system included a device manager. The device manager was coupled to a pulsed sensing module, a liquid-crystal display module and a data capture module. The sensor was made of iron oxide/multi-walled carbon nanotubes/tungsten oxide (Fe2O3/MWCNTs/WO3) composite material by the one-pot polyol method followed by metal organic decomposition (MOD) method. Scanning electron microscopy (SE

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Hsu, Yu-Jui, and 許育瑞. "The Implementation of the Multi-Nozzle Inkjet Printing System and Multi-Gas Sensing Device." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/76442545183226836686.

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碩士<br>國立臺灣大學<br>工程科學及海洋工程學研究所<br>104<br>Recently, developments of organic electronics has attracted attention in both academic and industrial researches. Because of flexibilities of organic electronics, different applications, such as monitors, E-Paper, organic solar cells, and RFID tags, etc., have been designed and implemented. And market potentials have been valued as one of the next generation technologies. Based on these technological advancements, different kinds of fabrication methods have been developed. In these fabrication methods, inkjet-printing technologies are intriguing because

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Costa, Henrique Miguel Aljustrel da. "Sensing humidity with multicomponent hybrid gel films and characterization of an optimized gas delivery system." Master's thesis, 2018. http://hdl.handle.net/10362/51476.

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Chia-WeiLee and 李家緯. "Investigation of Metal Oxide Thin Films Fabricated by RF Sputtering System and Their Gas Sensing Applications." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/px4f4t.

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Khater, Mahmoud Elsayed. "Use of Instabilities in Electrostatic Micro-Electro-Mechanical Systems for Actuation and Sensing." Thesis, 2011. http://hdl.handle.net/10012/6398.

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This thesis develops methods to exploit static and dynamic instabilities in electrostatic MEMS to develop new MEMS devices, namely dynamically actuated micro switches and binary micro gas sensors. Models are developed for the devices under consideration where the structures are treated as elastic continua. The electrostatic force is treated as a nonlinear function of displacement derived under the assumption of parallel-plate theorem. The Galerkin method is used to discretize the distributed-parameter models, thus reducing the governing partial differential equations into sets of nonlinear ord

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Yang, Tsung-Yeh, and 楊宗燁. "The Gas Sensing Properties of Nanocrystalline TiO2 based Systems." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/99372490614914982813.

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博士<br>大同大學<br>材料工程學系(所)<br>93<br>The gas sensing properties of nanocrystalline TiO2 are enhanced by submitting the sensor system to UV light irradiation. Titanium dioxide nanoparticles are produced by gas condensation technique under 5-mbar of helium and oxygen atmosphere, and then quenched to the liquid nitrogen temperature. The as prepared titanium dioxides of nanoparticles are porous free with uniform size. The powder X-ray diffraction (XRD) spectrum confirms that the as-prepared and after sinter treatments samples. The crystal structure and ceramic microstructure of the powders are deter

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(11036556), Yen-yu Chen. "2D MATERIALS FOR GAS-SENSING APPLICATIONS." Thesis, 2021.

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<div> <div> <div> <p> </p><div> <div> <div> <div> <div> <div> <p> </p><div> <div> <div> <p>Two-dimensional (2D) transition-metal dichalcogenides (TMDCs) and transition metal carbides/nitrides (MXenes), have been recently receiving attention for gas sensing applications due to their high specific area and rich surface functionalities. However, using pristine 2D materials for gas-sensing applications presents some drawbacks, including high operation temperatures, low gas response, and poor selectivity, limiting their practical sensing applications. Moreover, one of the long-standing challe

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Wu, Chuan-Yi, and 吳泉毅. "The Gas Sensing Properties of Nanocrystalline WO3-Based Hybrid Systems." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/71188645308768204825.

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博士<br>大同大學<br>材料工程研究所<br>91<br>Tungsten oxide nanoparticles are prepared by evaporating and oxidizing the tungsten boat in helium and oxygen atmosphere and then quenched to the liquid nitrogen temperature. The as-prepared tungsten oxide nanoparticles are porous-free with uniform size. The morphology and particle size distribution of the as prepared and after sinter treatments tungsten oxide nanoparticles are revealed by TEM and AFM. The long-range order of these nanoparticles can be examined by X-ray diffraction technique. The as-prepared nanoparticles exhibit a mixture structure of monocl

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Liou, Wei-Jen, and 劉維人. "Nitrogen Dioxide Gas Sensing Properties of Nanocrystalline TiO2-based Hybrid Systems." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/20648403158843519036.

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博士<br>大同大學<br>材料工程學系(所)<br>95<br>The main motivation of this study is developing effective gas sensors to monitor harmful gases, such as carbon monoxide (CO), ozone (O3), sulfur oxides (SOx) and nitrogen oxides (NOx), so that to make some contribution in protecting the environment. Gas sensors based on resistance changes of selected semiconductor materials have been successfully used for many years. Metal oxide semiconductor (MOS) attracts considerable interests to both researchers and users due to their suitabilities for using in electronic devices in a number of applications including gas s

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Tumbain, Sone Bertrand. "Low temperature tungsten trioxide nano/micro-systems for applications in gas sensing and electrochromism." 2013. http://hdl.handle.net/11394/3835.

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Philosophiae Doctor - PhD<br>In this work we primarily set out to investigate the technique of Aqueous Chemical Growth as a means of producing WO3 thin films that find applications in gas sensing and electrochromism. For the first time we demonstrated in this work, the heterogenous nucleation and growth of WO3 thin films on plain glass substrates and F-doped SnO2-glass substrates. This was achieved without the use of surfactants and template directing methods, using as a precursor solution Peroxotungstic Acid generated from the action of 30% H2O2 on pure W powder. The substrates used needed no

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