Download or read book Design and Characterization of Mixed Transition Metal Oxide Thin Film Gas Sensors Derived Trhough Sol gel Chemistry written by Lee Wesley Hoffman and published by . This book was released on 1996 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Masters Abstracts International written by and published by . This book was released on 1996 with total page 960 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Semiconductor Gas Sensors written by Raivo Jaaniso and published by Woodhead Publishing. This book was released on 2019-09-24 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semiconductor Gas Sensors, Second Edition, summarizes recent research on basic principles, new materials and emerging technologies in this essential field. Chapters cover the foundation of the underlying principles and sensing mechanisms of gas sensors, include expanded content on gas sensing characteristics, such as response, sensitivity and cross-sensitivity, present an overview of the nanomaterials utilized for gas sensing, and review the latest applications for semiconductor gas sensors, including environmental monitoring, indoor monitoring, medical applications, CMOS integration and chemical warfare agents. This second edition has been completely updated, thus ensuring it reflects current literature and the latest materials systems and applications. - Includes an overview of key applications, with new chapters on indoor monitoring and medical applications - Reviews developments in gas sensors and sensing methods, including an expanded section on gas sensor theory - Discusses the use of nanomaterials in gas sensing, with new chapters on single-layer graphene sensors, graphene oxide sensors, printed sensors, and much more

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 Fabrication and Characterization of Metal Loaded Mixed Metal Oxides Gas Sensors for the Detection of Hazardous Gases written by Chang-Seop Lee and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This study concerns gas sensors that may protect individuals by detecting hazardous gases that may be generated in hot spaces (≥50°C) with residues of organic waste. We investigated the responses and selectivities of the sensors to different kinds of hazardous gases such as acetaldehyde, toluene and hydrogen sulfide. We also investigated operating temperatures and catalysts for the sensors. The thick film semiconductor sensors that detected some hazardous gases were prepared using nano-sized sensing material powders (SnO2, WO3, ZnO) that were prepared through sol-gel and precipitation methods. The nano-sized sensing materials were blended with various amounts of metal oxides (SnO2, ZnO, WO3) and coated with transition metals (Pt, Pd, Ru, Au, Ag, Cu and In). The metal oxide thick films were fabricated on an Al2O3 plate with a Ni-Cr heater and a Pt electrode through a screen-printing method. Morphologies, compositions, phases, surface areas and particle sizes of sensor compounds were examined by SEM, EDS, XRD and BET analysis. The investigated response to the various hazardous vapors was expressed as the value of Ra/Rg, where Ra and Rg are the resistance of the sensor material in the air and in hazardous gas, respectively.

Download or read book Handbook of Gas Sensor Materials written by Ghenadii Korotcenkov and published by Springer Science & Business Media. This book was released on 2013-11-08 with total page 453 pages. Available in PDF, EPUB and Kindle. Book excerpt: The two volumes of Handbook of Gas Sensor Materials provide a detailed and comprehensive account of materials for gas sensors, including the properties and relative advantages of various materials. Since these sensors can be applied for the automation of myriad industrial processes, as well as for everyday monitoring of such activities as public safety, engine performance, medical therapeutics, and in many other situations, this handbook is of great value. Gas sensor designers will find a treasure trove of material in these two books.

Download or read book Nanostructured Gas Sensors written by Ankur Gupta and published by CRC Press. This book was released on 2023-01-06 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanostructured materials exhibit distinct properties by virtue of their nanoscale morphological variations, which open up endless possibilities to investigate unexplored and interesting applications. This textbook broadly covers the fabrication and characterization of nanostructured films and exploration of their gas-sensing applications. It presents the fundamentals of gas-sensing technology and a comprehensive study on smart gas sensing technology. Readers will find basics, analytical techniques, nanotechnology-enabled experimental findings, and future directions of smart gas-sensing technology at one place. Through the inclusion of up-to-date experimental knowledge of synthesis, processing, and application development, the book is suitable for academics at all levels.

Download or read book Sol Gel Derived Titania Films And Their Potential Application As Gas Sensor written by and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Today there is a great deal of interest in the development of gas sensors for various applications like monitoring of toxic gases, detection in oil reservoirs, mines, homes etc. Solid-state gas sensors have many advantages over the conventional analytical methods and hence are widely used. Amongst them, semiconducting metal-oxides based sensors are popular due to many advantages like low cost, small size, high sensitivity and long life. The present thesis reports a detailed work of TiO2 (Titania) thin film fabrication based on sol-gel method, study of their crystallization behavior and surface morphology, and characterizing them for alcohol sensing properties Sol-gel method is a wet chemical technique with many advantages over the conventional methods and offers a high degree of versatility to modify the film properties. Titania thin films were made with titanium isopropoxide as the precursor and ethanol and isopropanol as the solvents. Also effect of surfactants(PEG and CTAB) on the sol properties and film properties have experimentally examined. A in-house gas sensor testing setup has been designed and fabricated to characterize the sensors. Sensors with three different electrode configurations and also two different electrode material have been tested. The electrode geometry and material play a significant role on the sensing behavior and results for the same have been discussed.

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 2024-04-01 with total page 734 pages. Available in PDF, EPUB and Kindle. Book excerpt: Approx.530 pages Provides an overview of the material preparation and synthesis strategies of metal oxide composite and metal oxide hybrid materials for use in gas and humidity sensors Reviews emerging advanced metal oxide materials such as perovskites, spinel ferrites, and quaternary materials for gas and VOC sensors Discusses the potential opportunities and challenges to be circumvented in the use of metal oxide materials to enable new sensor technologies

Download or read book Handbook of Gas Sensor Materials written by Ghenadii Korotcenkov and published by Springer Science & Business Media. This book was released on 2013-09-18 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt: The two volumes of Handbook of Gas Sensor Materials provide a detailed and comprehensive account of materials for gas sensors, including the properties and relative advantages of various materials. Since these sensors can be applied for the automation of myriad industrial processes, as well as for everyday monitoring of such activities as public safety, engine performance, medical therapeutics, and in many other situations, this handbook is of great value. Gas sensor designers will find a treasure trove of material in these two books.

Download or read book Gas Sensors written by Sher Bahadar Khan and published by BoD – Books on Demand. This book was released on 2020-03-25 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on the applications of nanomaterials in the fabrication of gas sensors. It covers recent developments of different materials used to design gas sensors, such as conducting polymers, semiconductors, as well as layered and nanosized materials. The widespread applications of various gas sensors for the detection of toxic gases are also discussed. The book provides a concise but thorough coverage of nanomaterials applications and utilization in gas sensors. In addition, it overviews recent developments in and the fabrication of gas sensors and their attributes for a broad audience, including beginners, graduate students, and specialists in both academic and industrial sectors.

Download or read book Fabrication of Thin Film Tin Oxide Gas Sensors by Sol gel Technique written by Arporn Teeramongkonrasmee and published by . This book was released on 1998 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this dissertation, a systematic study involving the fabrication of thin film SnO2 gas sensors by sol-gel technique had been carried out. The sol solution of SnO2 was prepared by chemical synthesis process. Tin tetrachloride and sodium ethoxide were used as the fundamental reactants. The synthesis sol had been coated on the glass substrate by spin coating technique to form thin films. The coated films were then subjected to anneal at 550 C for 1 hour to change their structure to SnO2. It was found that the thickness of SnO2 films could be linearly controlled by varying the number of coatings. The thickness of each coating was about 350 A. In order to analyze the gas sensing performance quantitatively, a novel gas measuring circuit was proposed. This circuit could be used to calculate sensitivity and recovery time without depending on the external circuit components such as resistance. The performance of this proposed circuit had been compared with that of the conventional circuit in both theoretical and experiment aspects. The results indicated the conventional measuring circuit is not suitable for calculating gas sensitivity in the case which a semiconductor gas sensor under test has a nonlinear I-V characteristic. For the proposed sircuit, this nonlinear property did not cause any problem in calculating sensitivity. Moreover, the gas sensing performance of various gas sensors could be compared quantitatively if the bias voltage of all gas sensors were set to the same value. The characterization of the fabricating gas sensors had been performed on a flow injection system combining with the proposed measuring circuit. The sensitivity of gas sensor had been found to be strongly dependent on the film thickness. The experiments showed that the optimum thickness was about 1000 A. From the gas response tests to alcohol and ammonia solutions, it was found that the unmodified SnO2 gas sensor gave the highest sensitivity. The addition of some modified substances such as CuSO4, AgNO3 and Au reduced the gas sensitivity. However, there was a tendency to increase sensitivity by adding FeCl3. By using the power law model to analyze the change of sensitivity with sample concentration, it was found that the unmodified SnO2 gas sensor could be used to detect alcohol and ammonia in the range of 0.08-10 and 0.05-10% by volume respectively. The optimum operating temperature was 250 C for alcohol detection and 350 C ammonia detection.

Download or read book Sol gel Derived Metal Oxide Thin Films Design of New Materials for Chemical Sensing written by Kathryn Graessley Severin and published by . This book was released on 1996 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Gas Sensors Based on Conducting Metal Oxides written by Nicolae Barsan and published by Elsevier. This book was released on 2018-10-17 with total page 295 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gas Sensors Based on Conducting Metal Oxides: Basic Understanding, Technology and Applications focuses on two distinct types of gas sensors based on conducting metal oxides. Ion conduction, applied in so-called solid-state electrolytic sensors for one, and electronic conduction used in semiconductivity gas sensors for the other. The well-known ?–probe, a key component to optimize combustion in car engines, is an example of the former type, and the in-cabin car air-quality control SnO2 and WO2 sensor array stands for the semiconductivity type. Chapters cover basic aspects of functioning principles and describe the technologies and challenges of present and future sensors. - Provides reader background and context on sensors, principles, fabrication and applications - Includes chapters on specific technological applications, such as exhaust sensors, environmental sensors, explosive gases alarms and more - Presents a structured presentation that allows for quick reference of vital information

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 2023-10-16 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt: Complex and Composite Metal Oxides for Gas, VOC, and Humidity Sensors focuses on an overview of the advanced nanocomposite metal oxide materials for use in sensors for environmental monitoring applications. Volume 1 Fundamentals and Approaches introduces the ground rules essential for the development of smart gas, VOC and humidity sensors. This volume familiarizes researchers with the different sensors (resistive, electrolyte, FET, optical etc.) developed on various properties that includes electrical, SPR, luminescence, fiber optics etc. fabricated using metal oxide hybrids and nanocomposites. - Introduces the fundamentals of electrical and optical gas and humidity sensors - Reviews metal oxide hybrid materials for gas and humidity sensor applications, including metal oxide/polymer and metal oxide/carbon composite materials - Discusses complex metal oxide compounds and composite materials for use in gas, VOC, and humidity sensors

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 Enhancement of Nanocrystalline Zinc Oxide Based Electronic Gas Sensor by Surface Modification written by Yue Hou and published by . This book was released on 2014 with total page 173 pages. Available in PDF, EPUB and Kindle. Book excerpt: The increasing concerns of industrial safety, chemical control and environmental pollution are spurring demand for high performance gas sensors. Growing use of gas sensors is making gas sensors on demand. After decades of research and development activities, semiconductor based gas sensors are now used in a variety of applications. However, challenges still remain in the area of sensitivity, selectivity, response and recovery speeds and power consumption. Therefore, improvement of metal oxide gas sensors by the incorporation of different technology is important. In this research, modification of metal oxide semiconductor based gas sensor by impurity doping, laser irradiation, and plasma treatment was investigated. Zinc oxide (ZnO) is an n-type semiconductor with a wide direct band gap (~3.3 eV) and large binding energy (~60 meV). Due to its superior electrical properties and chemical stability, ZnO has been considered one of the most promising materials for gas sensor applications. ZnO thin films have been fabricated by different techniques, such as rf magnetron sputtering, pulsed laser deposition, molecular beam epitaxy, and sol-gel. Sol-gel is a powerful alternative for vacuum deposition. The purpose of this research was to enhance properties and gas sensor performance of nanocrystalline so-gel derived ZnO thin films via surface modification techniques. The effects of process conditions, impurity doping, laser irradiation, laser doping and plasma treatment on properties and gas sensor performance were investigated. The gas sensor performance of ZnO thin films was investigated at different operating temperatures for various reducing and oxidizing gases such as H2, NH3, CH4 and NOx. Al-doped ZnO thin films were prepared using the sol-gel process by changing the Al concentration from 0 to 5.0 at% using two different Zn precursors. It was found that 3.0 at% Al-doped ZnO films had optimum properties such as high electrical conductivity, crystallinity, high sensing response and short response time for ZnO films derived with both Zn precursors. Ga-doped ZnO thin films were also presented by changing the concentration of Ga from 0.1 to 1.0 at%. The gas sensing behavior was investigated at an operating temperature of 130oC. It was found that the 0.3 at% Ga-doped ZnO thin film sensor had more than a 40% higher sensing response and a shorter response time than the sensors made with as-deposited films. Laser irradiation was utilized as a novel heat treatment method in this dissertation. A pulsed laser system with a wavelength of 532 nm was used as the irradiation source. Laser irradiation produced two kinds of Al-doped ZnO films depending on the laser energy level. The impact of laser irradiation was also varied according to the film thickness. The Al-doped ZnO sensors exhibited enhanced sensor performance with optimum laser fluence compared with that of as-deposited sensors. The results suggested that the crystallinity of the Al-doped ZnO thin films was essential to achieve an optimum gas detection capability. A laser doping process using a pre-deposited Al precursor layer for ZnO thin films was also investigated. Plasma treatment was utilized in the research with the intention to adjust the number of intrinsic defects in ZnO films. Both O2 and H2 plasmas were carried out with the treatment time varying from 3 to 15 min. The gas sensor performance was investigated for NH3 and NOx at various concentrations. An improvement of more than 50% in sensing response was observed with the optimum treatment time for NH3 detection. The impact of H2 plasma treatment of ZnO sensors on its gas sensor performance was also studied. The selectivity was studied for a likelihood mixture of reducing gases. The results indicated that ZnO sensors had a low detection limit towards NH3. It was found that the selectivity of these reducing gases was in the order of NH3> H2> CH4. However, unless high concentration of NH3 exposure is a factor, ZnO sensors are selective respond to H2. Furthermore, the ZnO sensors are also capable of discriminating different gases such as NH3, H2, CH4 and NOx. This research involves different techniques, which have been employed on the ZnO thin film based gas sensors in order to enhance the gas sensing characteristics such as sensing response and response time. As expected, the ZnO sensors exhibited high response, short response time and decent selectivity toward target gases with optimum treatment conditions. The results also suggested that the ZnO sensors were capable of detecting ppm level gases at relatively low operating temperature range (100 ~ 200oC), which is beneficial in many applications. Therefore, these techniques can be utilized to manufacture gas sensors using metal oxide semiconductors.