Download or read book Influence of Platinum on Structural Thick Film Gas Sensor Based on Lanthanum Oxide doped Tin IV Oxide for Carbon Dioxide Detection written by Maryam Ehsani and published by . This book was released on 2014 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chemical Abstracts written by and published by . This book was released on 2002 with total page 2692 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Detection Mechanism of Reducing Gases and Influence of Water on Tin Dioxide Based Gas Sensors written by Katharina Großmann and published by . This book was released on 2013-01 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Co Sensitivity Towards PD doped Tin IV Oxide Thin Films Gas Sensor written by ld Aezal Muhammad F and published by . This book was released on 2010 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sensing Properties of Palladium doped Tin IV Oxide Thin Film on Carbon Monoxide Gas written by Nurul Fatheyah Ismail and published by . This book was released on 2012 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ceramic Abstracts written by and published by . This book was released on 2000 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Titanium Dioxide based Carbon Monoxide Gas Sensors written by Zachary Mark Seeley and published by . This book was released on 2009 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sensivity CO Gas Sensor Thin Film Tin IV Oxide Doped Pd Using RF Sputtering at Different Deposition Time written by ld Nurul Ain Mohd. Sukri and published by . This book was released on 2010 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Tio2 Thick Film Gas Sensor written by Chandrakant Dighavkar and published by LAP Lambert Academic Publishing. This book was released on 2011-07 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solid state gas sensors have proved to be very promising for monitoring the emission of air pollutant and toxic gases because they are a low cost element. Titanium dioxide (TiO2) is metal oxide semiconductor.TiO2 has been extensively studied owing to its wide range of applications which include photo catalysis, heterogeneous catalysis, energy storage, solar cell components, corrosion-protective coatings,optical coatings and gas sensing.The objectives of this project was to study the structural, electrical and gas sensing properties of undoped and doped TiO2 thick films.Gas sensing properties of the films were studied in static gas sensing system by exposing the films to the different gases as CO2, H2S, NH3,Ethanol, LPG and NO2 at different operating temperatures. The optimum operating temperature,sensitivity, selectivity, response, recovery time and the active region of detected gas were determined.Results showed that the doping alters the orientation of microstructure, grain size, composition, electrical and gas sensing characteristics.TiO2 films were observed to be most sensitive to reducing gases than oxidizing gases.
Download or read book Spectroscopic Insights in the Gas Detection Mechanism of Tin Dioxide Based Gas Sensors written by David Degler and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Study of Sensitivity of TIN IV Oxide Thin Films at Various Operating Temperatures for Co Gas Sensor written by ld Nurul Fatheyah Ismail and published by . This book was released on 2008 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Novel Strategies for Design of High Temperature Titania based Gas Sensors for Combustion Process Monitoring written by Marla Lea Frank and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: TiO2 -based sensors were developed and characterized for improvement of selectivity and sensitivity towards CO gas at high temperatures. Selectivity was improved by combining several sensors into an array, while sensitivity improvement was studied by examination of the effects of various metal and metal oxide additives and reactive sputtering film preparation. TiO2-based sensors containing La2O3 and La2O3/CuO were combined into an array for testing of CO and O2 gas mixtures. Nonlinear regression analysis was developed to determine the concentrations of gases in the mixture. The regression technique can be used to determine the prediction ability of gas sensor combinations for given gas concentration ranges using a defined orthogonality index, as well as to determine the amount of each gas in the mixture based on the responses of a set of sensors. The prediction ability for a La2O3-containing sensor combined with La2O3/CuO-containing sensors with varying levels of CuO are compared for a range of CO and O2 concentrations. Concentrations of CO and O2 in gas mixtures are predicted using the La2O3- and La2O3/CuO-containing sensors and the regression analysis. Addition of various metals and metal oxides, including Au, CuO and La2O3 to TiO2-based gas sensors has been examined to determine the effect of additives on the gas-surface reactivity and electrical response of the sensors. Electrical measurements show that sensor sensitivity is decreased upon addition of La2O3 with only a slight increase in sensitivity when CuO is added to La2O3-containing sensors. Au, however, was found to increase the sensitivity of the TiO2-based sensors with and without La2O3. Gas chromatography was used to determine the catalytic conversion of CO for the various sensor materials at different temperatures for comparison with electrical measurements. General guidelines for additive selection have been proposed based on the results. Reactively sputtered thin film TiO2 gas sensors have been fabricated and characterized for improved sensitivity to CO gas. Sensitivity of optimized thin film sensors to CO was found to be much higher than for traditional thick film TiO2-based sensors. Characterization of the phase and morphology of the sensors using XRD, TEM and AFM show that the film consists of a dense layer of TiO2 in the rutile phase, with surface roughness changing with film thickness. Sensitivity of the thin film sensor could be varied by changing the film thickness, with a film thickness of 240 nm showing the best sensitivity to CO gas, although response and recovery times were slow.
Download or read book Gas Sensor Studies On Sensor Film Deposition ASIC Design And Testing written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The widespread use of Liquid Petroleum Gas (LPG) for cooking and as fuel for automobile vehicles requires fast and selective detection of LPG to precisely measure the leakage of gas for preventing the occurrence of accidental explosions. The adoption of Micro-Electro-Mechanical-System (MEMS) technology for fabricating the gas sensor provides other potential advantages for sensing applications, which includes low power consumption, low fabrication cost, high quality, small size and reliability. MEMS based gas sensor requires a sensitive layer of oxide material like ZnO, SnO2, TiO2, Fe2O3, etc. The tin oxide material used in the present work changes its electrical properties, as it interacts with the reducing gas like LPG. The sensor material becomes active only at high temperature such as 400ðC, thereby realizing the need of a micro heater to reach the desired temperature. To control the temperature of micro heater and to determine the change in electrical properties of the sensor due to its interaction with LPG an Application Specific Integrated Circuit (ASIC) forms an essential constituent of the MEMS based gas sensor. In the present work, an attempt has been made to improve the sensitivity of LPG gas sensor and it is correlated with other properties by different characterization techniques. The work also includes the design as well as testing of ASIC for gas sensor system. Process parameters particularly deposition time and substrate temperature have a profound influence on the microstructure of the tin oxide film, which in turn affects the gas sensing properties. To study the effects of these parameters, RF magnetron sputtering system is used for depositing tin oxide films onto the silicon substrate, which is compatible with CMOS technology. The effects of structural properties, optical properties and the porosity of the films are also studied and correlated with the gas sensing properties. In this direction the deposited films are characterized using X-Ray Diffr.
Download or read book The Sensitivity of Undoped and Antimony Doped Tin IV Oxide Thin Films at Different Thickness Towards CO Gas written by Farah Hanani Zulkifli and published by . This book was released on 2010 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Development and Characterization of Titania Based Gas Sensors for Combustion Process Monitoring written by Joseph A. Trimboli and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Gas sensors that utilize metal oxide materials are widely used in industry to monitor combustion processes. While they are inexpensive to fabricate and robust in high temperature environments, many of these devices are not selective towards the species of interest when placed in a stream composed of multiple gases. A titania-based sensor was modified in various ways with Pt-Y zeolite in order to create a device that was selective towards hydrocarbons in the presence of CO. To understand this property, gas chromatography was used to study the products formed when CO and propane were passed through a bed of Pt-Y. The device using Pt-Y and titania was then compared to a sensor that used titania doped with colloidal platinum. A model based on the oxidation state of the platinum metal was proposed to explain the results. The effects of humidity on a titania based gas sensor were studied using electrical measurements. It was found that high humidity had a relatively small effect on the sensor conductance when compared to gases like CO. To explain these results, diffuse reflectance infrared spectroscopy was performed on a hydrated titania surface that was heated to various levels. The infrared data showed that hydroxyl groups and water were formed on the titania surface at high temperature, with bridging hydroxyl groups being the first to form. These spectroscopic studies were correlated to the electrical measurements in order to propose a mechanism involving the displacement of adsorbed oxygen species by water. In order to eliminate the response of a titania sensor to fluctuations in humidity, a siliceous zeolite was fabricated on an alumina support. It was determined with electrical measurements that this hydrophobic membrane was effective in stopping water from permeating the membrane. In addition, it was found that CO transversed this membrane quickly relative to propane which permeated at a much slower rate. To quantify the diffusion phenomenon, gas permeation experiments were conducted in which nitrogen, oxygen, CO, and propane were each exposed to a membrane individually. A model explaining the permeance of these gases was then proposed.
Download or read book A Parametrized Numerical Model to Simulate the Semiconductor Influence of Thick Film Metal Oxide Gas Sensors written by Peter Bonanati and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Conference Papers Index written by and published by . This book was released on 1988 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt: Monthly. Papers presented at recent meeting held all over the world by scientific, technical, engineering and medical groups. Sources are meeting programs and abstract publications, as well as questionnaires. Arranged under 17 subject sections, 7 of direct interest to the life scientist. Full programs of meetings listed under sections. Entry gives citation number, paper title, name, mailing address, and any ordering number assigned. Quarterly and annual indexes to subjects, authors, and programs (not available in monthly issues).
