Download or read book Studies in Semiconducting Metal Oxides in Conjunction with Silicon for Solid State Gas Sensors Progress Report April 1 1977 September 30 1979 written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A fundamental investigation of SnO2 and ZnO thin films with emphasis on their use in solid state gas detection is discussed. Methods of thin film preparation, described here, include the chemical vapor deposition (CVD) technique for SnO2 films and the radio frequency sputtering technique for SnO2 and ZnO films. The use of Auger electron spectroscopy, (AES), transmission electron microscopy, (TEM) and x ray diffractometry, (XRD) in the analysis of these films is reported. Careful selection of the most useful films are made by applying these techniques to the films prepared here. The electrical stability and gas sensitivity response of rf sputtered films are studied. Information regarding the mechanisms involved in gas detection are also presented. Some preliminary device structures using these films along with well-established techniques for planar processing are also reported.
Download or read book Energy Research Abstracts written by and published by . This book was released on 1982 with total page 1744 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Studies in Semiconducting Metal Oxides in Conjunction with Silicon for Solid State Gas Sensors Progress Report for April 1 1977 March 31 1978 written by and published by . This book was released on 1978 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ZnO films have been reproducibly grown using chemical deposition and radio-frequency sputtering techniques. These films are polycrystalline or amorphous, but are stable, uniform and lend themselves to material characterization by Auger and x-ray analysis techniques, and electrical measurements. SnO2 films have been reproducibly grown by chemical vapor deposition, vacuum deposition and radio-frequency sputtering techniques. These films are also polycrystalline or amorphous, and lend themselves to material characterization and measurements. By vacuum deposition techniques, Si-SnO2 heterojunctions have been grown, which exhibit good rectification properties. An original thermodynamic analysis of the growth of SnO2 by a chemical vapor deposition technique based on the reaction between SnCl4 and H2O has been developed and submitted for publication. Pd-SiO2-Si Schottky barrier diodes exhibiting excellent rectification properties have been successfully fabricated. A formalism has been established for the analysis of the behavior of these devices in the presence of H2, H2S and CO. The ZnO films grown by chemical deposition have proven to be sensitive to CO and CH4. Sputtered ZnO films are sensitive to O2 and H2. SnO2 films grown by chemical vapor deposition are not very sensitive to gases. Sputtered films, however, are very sensitive to H2 and H2S. The Pd-SiO2-Si diodes are extremely sensitive to H2, H2S and NH3, and, under certain conditions, to CO. A microprocessor data processing system has been developed incorporating gas sensors in the presence of a variety of gases and gas mixtures.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1980 with total page 794 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Download or read book Semiconducting Metal Oxides for Gas Sensing written by Yonghui Deng and published by Springer Nature. This book was released on 2023-08-23 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt: The second edition of this book focuses on the synthesis, design, and application of semiconducting metal oxides as gas sensing materials, including the gas sensing mechanism, and modification methods for sensing materials, while also providing a comprehensive introduction to semiconductor gas sensing devices. As an essential part of IoT (Internet of things), gas sensors have shown great significance and promising prospects. Therefore, studies on functional mesoporous metal oxides, one of the most important gas sensing materials based on their unique Knudsen diffusion behavior and tailored pore structure, have increasingly attracted attention from various disciplines. The book offers a valuable reference guide to metal oxide gas sensing materials for undergraduate and graduate students alike. It will also benefit all researchers who are involved in synthesis and gas sensing of metal oxides nanomaterials with relevant frontier theories and concepts. Engineers working on research and development of semiconductor gas sensors will also find some new ideas for sensor design.
Download or read book Government Reports Annual Index written by and published by . This book was released on 1980 with total page 982 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1980-08 with total page 898 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Metals and Semiconductiong Metal oxides in Integrated Devices in Conjunction with Silicon for Solid State Gas Detection written by David Joseph Leary and published by . This book was released on 1980 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book New Approaches for the Basic Understanding of Semiconducting Metal Oxide Based Gas Sensors Sensing Transduction and Appropriate Modeling written by Michael Hübner and published by . This book was released on 2012-03-26 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Semiconductor Measurement Technology written by and published by . This book was released on 1980 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Semiconductor Measurement Technology written by W. Murray Bullis and published by . This book was released on 1977 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Semiconductor Measurement Technology written by W. M. Bullis and published by . This book was released on 1980 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Semiconductor Metal Oxides for Hydrogen Gas Sensing written by Qahtan Al-zaidi and published by LAP Lambert Academic Publishing. This book was released on 2012 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: The only practical way to imitate human nose function is via gas sensors which monitor air quality and provide a mean to premature alert of potential risk. A gas sensor can form a part of an early warning system, notifying the appropriate authorities or provide the feedback signal to a process control system. To achieve this, the gas sensor must be accurate and stable in-situ real time measurements. It is foreseen that hydrogen energy will form the infrastructure that will power future societies since it is a clean, cost-effective and renewable source of energy. However, hydrogen, being flammable gas, has a lower expolsion limit of 4% in air meaning that even a small spark can ignite the mixture. Therefore, hydrogen generation, transport and storage can be dangerous if not handled with caution. This requires high precision sensitive gas sensors which are able to detect the smallest leaks fastly. Semiconductor Metal Oxide gas sensors are an important candidate for this task.
Download or read book Nanostructured Semiconducting Metal Oxides for Use in Gas Sensors written by Jinsoo Park and published by . This book was released on 2010 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Complex and Composite Metal Oxides for Gas VOC and Humidity Sensors Volume 2 written by Bal Chandra Yadav and published by Elsevier. This book was released on 2024-04 with total page 732 pages. Available in PDF, EPUB and Kindle. Book excerpt: Complex and Composite Metal Oxides for Gas, VOC and Humidity Sensors, Volume Two: Technology and New Trends focuses on an overview of the advanced nanocomposite metal oxide materials used in sensors for environmental monitoring applications. Volume Two discusses the state-of-the-art for the synthesis methods of innovative morphology, metal oxide hybrids, and heterostructures. It also describes the new generation of complex materials such as perovskites, spinel ferrites, and quaternary type-based gas and VOC sensors. This volume includes a brief discussion on advanced strategies for the development of futuristic sensors with properties like room temperature operation, self-power generation, self-healable, or flexible and wearable.
Download or read book Metalloporphyrin decorated Semiconducting Oxides for Gas Sensing Applications written by Ziqi Lu and published by . This book was released on 2020 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: The air quality and environmental problems have attracted more and more researchers’ attention in the past few decades. Since Taguchi released the first practical semiconductor gas sensor applied to the market, more and more researchers have invested in the research on the improvement and application of semiconductor gas sensors and a large number of modified tin oxide gas sensors with various gas sensing properties have been reported in the past few decades. This project has created new solid-state materials of metalloporphyrin-decorated metal oxides for gas sensing applications, directed at the measurement of nitrogen dioxide at low concentration in air. The hypothesis was that metalloporphyrins grafted onto the surface of tin dioxide could act as electronic surface states, such that changes in the energy or electron occupancy of the highest occupied molecular orbital of the porphyrin would be reflected in changes of the conductivity of the tin dioxide. Adsorption of nitrogen dioxide as an axial ligand of the porphyrin would then be signalled by a change in electrical conductivity. Tin dioxide doped with In(III) was successfully synthesised. This was a metastable material since In(III) is known to be insoluble in SnO2. Successful substitution of indium was signalled by a significantly decreased electrical conductivity , such that the effect of adsorption of surface donor states could be observed, and confirmed by X-ray photoelectron spectroscopy (XPS). Ruthenium(II)-carbonyl, platinum and palladium porphyrins having peripheral carboxylic acid groups were synthesised: the peripheral carboxylate being presumed, from literature studies, important to secure ‘flat-on’ adsorption of the porphyrin onto the oxide. All porphyrins and metalloporphyrins were fully characterized by 1H NMR, UV-Vis, IR and MS and the metal oxides fully characterized by powder XRD, SEM, EDS, XPS and BET adsorption. The increase in electrical conductivity of the oxide consequent on adsorption of the porphyrin confirmed the first hypothesis. Surface states within the band gap of the oxide, associated with the porphyrin, were detected by XPS. The Ru-CO porphyrin-decorated oxide was explored as a sensor for NO2 in air, at concentrations relevant to the study of urban air quality – up to a mixing ratio of 400 parts-per-billion (109) by volume. There was a significant signal to the presence of NO2 with the sensor heated at temperatures up to 150oC, confirming the second hypothesis. However, the porphyrin was rapidly and irreversibly decomposed at temperatures above 125oC, observable by the loss of the distinctive orange-red colour of the porphyrin and by changes in the XP valence band spectrum. Although the temperature instability would limit the practical application of this particular formulation, the successful confirmation of the hypotheses underpinning this work shows that the idea of engineering surface states of metal oxides in order to create specific gas sensors is workable and worthy of further exploration.
Download or read book Complex and Composite Metal Oxides for Gas VOC and Humidity Sensors Volume 1 written by Bal Chandra Yadav and published by Elsevier. This book was released on 2023-10-23 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: Complex and Composite Metal Oxides for Gas, VOC, and Humidity Sensors: Fundamentals and Approaches, Volume One overviews the advanced nanocomposite metal oxide materials used in sensors for environmental monitoring applications. The book introduces the ground rules essential for the development of smart gas, VOC, and humidity sensors, and familiarizes researchers with the different types of sensors (resistive, electrolyte, FET, optical etc.) developed on various properties, including electrical, SPR, luminescence, fiber optics etc., all of which are fabricated using metal oxide hybrids and nanocomposites.
