Download or read book Higher order Sensors for Fast Detection of Gases written by Isao Sasaki and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The research is divided into two main parts: the sensing part and the gas delivery part. The reliable chemical information from the chemical sensor requires that the sensitive layer of the sensor exhibits long-term stability. To improve the stability of the sensing layer, camphorsulfonic acid was added to the formic acid. The introduction of photo-irradiation at 254 nm as an additional treatment to the sensing layer was proved to be effective. For gas selectivity of PANI matrix, metal or metal oxide clusters have been incorporated into the matrix. The composite materials of PANI with silver, copper, iron, nickel, palladium and mercury were also prepared and exposed to different gases. The second part of the thesis discusses the gas delivery system to the sensors using the synthetic jet technology. The sniffing functionality was demonstrated using the designed jet cell for operation in the open system. The gas sniffing experiments showed that in the presence of the jet, the response time of the sensor is faster by about two orders of magnitude (20 compared to 1800 seconds). The jet sampling system was applied to continuous monitoring of ammonia gas filter performance using the chemFET array. The jet system collected the gas before and after filtering, and the difference between the two responses was compared to observe the break-through of the filter. It was concluded that the gas sensing system integrated with the gas sampling functionality can be applied to monitor a gas filter performance. The cell was designed so that the impinging jet covers the sensing active area of the array of eight chemFETs. The two-dimensional distribution of the ammonia gas concentrations showed that the jet covers the active sensing area in an effective way so that the sampling volume for sensing is significantly reduced compared with the conventional gas flow cell system. Based on these initial studies shown in this thesis, the proposed gas sniffing system was shown to be effective in realizing fast detections of gases for critical applications of a gas sensor system.
Download or read book Semiconductor Device Based Sensors for Gas Chemical and Biomedical Applications written by Fan Ren and published by CRC Press. This book was released on 2016-04-19 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sales of U.S. chemical sensors represent the largest segment of the multi-billion-dollar global sensor market, which includes instruments for chemical detection in gases and liquids, biosensors, and medical sensors. Although silicon-based devices have dominated the field, they are limited by their general inability to operate in harsh environments
Download or read book Gas Sensors written by G. Sberveglieri and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 413 pages. Available in PDF, EPUB and Kindle. Book excerpt: There were two reasons that induced me to plan and to organize this book, the first was the lack of a text entirely devoted to the subject of gas sensors, notwithstanding some books devoted to the various kind of chemical sensors have recently been published. The second reason was the need of introducing the basic topics of gas detection mechanisms to a growing number of researchers active in research and development laboratories of industries and uni versities. The field of chemical sensors is indeed in fast and consistent growth, as it is proved by the increased number of participants to the congresses that were recently held on this subject, namely the Third Meeting on Chemical Sensors (September 24 - 26, 1990, Cleveland), Transducers' 91 (June 24 - 27, 1991, S. Francisco) and EUROSENSORS V (September 30 - October 3, 1991, Rome). Therefore, this book is mainly intended as a reference text for researchers with a MS degree in physics, chemistry and electrical engineering; it reports the last progresses in the R. & D. and in the technology of gas sensors. I choose to deal specifically with the topic of gas sensors because these devices show a very large number of applications in the domestic and industrial field and they are characterized by a great effort of research and development.
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 510 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 Toxic Gas Sensors and Biosensors written by Inamuddin and published by Materials Research Forum LLC. This book was released on 2021-02-15 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book focuses on novel sensor materials and their environmental and healthcare applications, such as NO2 detection, toxic gas and biosensing, hydrazine determination, glucose sensing and the detection of toxins and pollutants on surfaces. Materials covered include catalytic nanomaterials, metal oxides, perovskites, zeolites, spinels, graphene-based gas sensors, CNT/Ni nanocomposites, glucose biosensors, single and multi-layered stacked MXenes, black phosphorus, transition metal dichalcogenides and P3OT thin films. Keywords: Toxic Gas Sensors, Biosensors, Nitrogen Dioxide Detection, Hydrazine Determination, Glucose Sensing, Catalytic Nanomaterials, Metal Oxides, Perovskites, Zeolites, Spinels, Graphene-based Gas Sensors, CNT/Ni Nanocomposites, Mxenes, Black Phosphorus, Transition Metal Dichalcogenides, P3OT Thin Films.
Download or read book Nanostructure Based Sensors for Gas Sensing from Devices to Systems written by Sabrina Grassini and published by MDPI. This book was released on 2019-10-29 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt: The development of solid state gas sensors based on microtransducers and nanostructured sensing materials is the key point in the design of portable measurement systems able to reach sensing and identification performance comparable with analytical ones. In such a context several efforts must be spent of course in the development of the sensing material, but also in the choice of the transducer mechanism and its structure, in the electrical characterization of the performance and in the design of suitable measurement setups. This call for papers invites researchers worldwide to report about their novel results on the most recent advances and overview in design and measurements for applications in gas sensors, along with their relevant features and technological aspects. Original research papers are welcome (but not limited) on all aspects that focus on the most recent advances in: (i) basic principles and modeling of gas and VOCs sensors; (ii) new gas sensor principles and technologies; (iii) Characterization and measurements methodologies; (iv) transduction and sampling systems; (vi) package optimization; (vi) gas sensor based systems and applications.
Download or read book Nanomaterials Based Gas Sensors for SF6 Decomposition Components Detection written by Xiaoxing Zhang and published by BoD – Books on Demand. This book was released on 2017-06-07 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: The insulating medium used in gas-insulated switchgear is SF6 gas, which has been widely used in substations. Energy generated by discharge will cause the composition of SF6 and generate characteristic component gases. Diagnosing the insulation defect through analyzing the decomposed gases of SF6 by chemical gas sensors is the optimal method due to its advantages. Carbon nanotubes, TiO2 nanotubes and graphene are chosen as the gas-sensing materials to build specific gas sensors for detecting each kind of SF6 decomposed gases and then enhance the gas sensitivity and selectivity by material modification. The properties and preparation methods are introduced in this book. The author studied the micro-adsorption mechanism and macro-gas sensing properties by theoretical calculation and sensing experiment.
Download or read book Solid State Gas Sensors Industrial Application written by Maximilian Fleischer and published by Springer Science & Business Media. This book was released on 2012-06-05 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gas sensor products are very often the key to innovations in the fields of comfort, security, health, environment, and energy savings. This compendium focuses on what the research community labels as solid state gas sensors, where a gas directly changes the electrical properties of a solid, serving as the primary signal for the transducer. It starts with a visionary approach to how life in future buildings can benefit from the power of gas sensors. The requirements for various applications, such as for example the automotive industry, are then discussed in several chapters. Further contributions highlight current trends in new sensing principles, such as the use of nanomaterials and how to use new sensing principles for innovative applications in e.g. meteorology. So as to bring together the views of all the different groups needed to produce new gas sensing applications, renowned industrial and academic representatives report on their experiences and expectations in research, applications and industrialisation.
Download or read book Nanotechnology based Sensors for Detection of Environmental Pollution written by Fernanda Maria Policarpo Tonelli and published by Elsevier. This book was released on 2024-05-20 with total page 639 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanotechnology-based Sensors for Efficient Detection of Environmental Pollution discusses the use of nanotechnology to generate sensors capable of performing efficient detection of different types of environmental pollutants. Nanomaterial’s characteristics such as large surface area, good reactivity, and possibility to suffer chemical surface modification to recognize different types of molecules are useful, especially to perform the detection of specific environmental pollutants. Innovative and efficient ways to detect environmental pollution are urgently needed for sustainability and the nanotechnology field has an enormous potential to offer strategic solutions. Nanotechnology-based sensors offer an efficient way of detecting the presence of contaminants and determine its structure and chemical nature is by applying nanotechnology and/or nanobiotechnology. This book will contain 5 parts: the first one will be dedicated to exploring environmental pollution as a threat to life on Earth and main contaminants (inorganic, organic or pathogens) and the risk they represent to living beings. The second part will be dedicated to nanotechnology allowing pollutants’ detection covering a brief history of nanotechnology-based sensors, different types of nanotechnology-based sensor (optical, electrochemical, and magnetic), nanotechnology-based sensors’ design and fabrication and nano biosensors. The third part will be focused on important specific pollutants (pesticides, heavy metal, dyes, toxic gas, pharmaceutical waste, petroleum hydrocarbons, and pathogenic microbes) and their detection by nanotechnology-based sensors. The fourth part will be dedicated to important nanomaterials in nanotechnology-based sensors, exploring carbon-based and non-carbon-based material in nanoscale (graphene, carbon nanotubes, quantum dots, magnetic nanomaterials, non-magnetic nanoparticles) and also point-of-care sensors and functionalization to generate optimized nanotechnology-based sensors to pollutants’ detection. The fifth and last part of Nanotechnology-based Sensors for Efficient Detection of Environmental Pollution will address relevant practical aspects related to nanotechnology-based sensors, covering advantages and challenges, safety, economic and commercial aspects related to the field and also sustainability, highlighting green nanomaterials on nanotechnology-based sensors. Provides a comprehensive, multidisciplinary review of nanotechnology-based sensors Supplies readers extensive knowledge on detecting harmful pollutants in different environments using nanotechnology-based sensors Presents chapters dedicated to the detection of pollutants different from toxic gas and pharmaceutical products, such as pesticides, heavy metals, dyes, pathogens, and petroleum hydrocarbons Introduces information on pollutants and the threats they represent to living beings, nanotechnology-based sensor’s design and fabrication, a brief history of the field, and practical issues related to the field, such as economics, safety, and challenges
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 Advanced Self assembled Materials with Programmable Functions written by Huacheng Zhang and published by Frontiers Media SA. This book was released on 2022-05-04 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Signal Processing Approaches to the Detection and Localization of Gas Chemical Sources Using Partially Selective Sensors written by Victor Pomareda Sesé and published by . This book was released on 2013 with total page 239 pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to recent progress, higher-order chemical instrumentation provides large amounts of data which need automated processing in order to extract relevant information. In most cases, the raw signals or spectra are too complex for manual analysis. The ability to detect, identify and quantitate chemical substances in gas phase in field operations is required in a huge number of applications. Among them, I would like to highlight the need for chemical sensing on diverse humanitarian, safety and security applications. In these cases, it becomes extremely important to continuously monitor the environments where chemicals are spread in order to be ready to act when abnormal events are discovered. In most critical scenarios the sample can not just be taken to the laboratory and analyzed, since an immediate answer is needed. In some other scenarios, the exploration of the area must be performed because the localization of the gas source or material of interest is unknown. This exploration can be performed using multiple mobile sensors in order to localize the chemical source or material. Different sensing technologies have been successfully used to detect and identify different chemical substances (gases or volatile compounds). These compounds could be either toxic or hazardous, or they can be signatures of the materials to be detected, for instance, explosives or drugs. Among these technologies, mobility based analyzers provide fast responses with high sensitivity. However, IMS instruments are not exempt of problems. Typically, they provide moderate selectivity, appearing overlapped peaks in the spectra. Moreover, the presence of humidity makes peaks wider, thus worsening the resolving power and the resolution. Furthermore, the response of IMS is non-linear as substance concentration increases and more than one peak can appear in the spectra due to the same compound. In the present thesis, these problems are addressed and applications using an Ion Mobility Spectrometer (IMS) and a Differential Mobility Analyzer (DMA) are shown. It is demonstrated that multivariate data analysis tools are more effective when dealing with these technologies. For the first time, multivariate data analysis tools have been applied to a novel DMA. It is shown that DMA could be established as a good instrumentation for the detection of explosives and the detection and quantitation of VOCs. Furthermore, Multivariate curve resolution Alternating Least Squares (MCR-ALS) is shown to be suitable to analyze IMS spectra qualitatively when interfering chemicals appear in the spectra and even when their behaviour is non-linear. Partial Least Squares (PLS) methods are demonstrated to work properly for the quantitative analysis of these signals; from this analysis the chemical concentrations of the target substances are obtained. It is also demonstrated in this thesis that the quantitative measurements from these sensors can be integrated in a gas source localization algorithm in order to improve the localization of the source in those scenarios where it is required. It is shown that the new proposal works significantly better in cases where the source strength is weak. This is illustrated presenting results from simulations generated under realistic conditions. Moreover, real-world data were obtained using a mobile robot mounting a photo ionization detector (PID). Experiments were carried out under forced ventilation and turbulences in indoors and outdoors environments. The results obtained validate the simulation results and confirm that the new localization algorithm can effectively operate in real environments.
Download or read book Gas Sensing Fundamentals written by Claus-Dieter Kohl and published by Springer. This book was released on 2014-08-18 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume, which addresses various basic sensor principles, covers micro gravimetric sensors, semiconducting and nano tube sensors, calorimetric sensors and optical sensors. Furthermore, the authors discuss recent developments in the related sensitive layers including new properties of nano structured metal oxide layers. They provide in-depth insights into the unique chemistry and signal generation of copper oxide in percolating sensors and present a variety of applications of functional polymers made possible by proper imprinting. Highlights of the subjects covered include: • requirements for high-temperature sensors • carbon nano tube sensors • new sensing model for nanostructured In2O3 • bio mimetic approach for semiconductor sensor-based systems • optical readout for inorganic and organic semiconductor sensors • concept of virtual multisensors to improve specificity and selectivity • calorimetric sensors for hydrogen peroxide detection • percolation effect-based sensors to implement dosimeters • imprinted polymer layers for bulk and surface acoustic wave sensors
Download or read book Sensors Measurement and Intelligent Materials written by Yun Hae Kim and published by Trans Tech Publications Ltd. This book was released on 2013-02-13 with total page 3310 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume is indexed by Thomson Reuters CPCI-S (WoS). The papers of this 4 volumes set on "Sensors, Measurement and Intelligent Materials" are grouped as follows: Chapter 1: Intelligent Materials and Structures; Chapter 2: Sensors; Chapter 3: Techniques for Measurement, Detection and Monitoring; Chapter 4: Data Acquisition, Data Mining and Data Processing; Chapter 5: Automation and Control. Technologies and Engineering; Chapter 6: Intelligent System; Chapter 7: Mechatronics; Chapter 8: Microelectronics, Electronics and Electrical. Circuits and Devices; Chapter 9: Network Engineering and Communication Technology; Chapter 10: Applied Computing and Information Technologies; Chapter 11: Materials and Processing Technologies; Chapter 12: Applied Mechanics in General Mechanical Engineering and Construction.
Download or read book Advanced Gas Sensing written by Theodor Doll and published by Springer Science & Business Media. This book was released on 2003-05-31 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advanced Gas Sensing focuses on the Electroadsorptive Effect: its theory, experimental measurement and applications in consumer gas sensors as well as in surface physics laboratory work. The Electroadsorptive Effect is invaluable when used in MEMS gas sensors. The authors use a general approach that covers new insights into temperature modulation and the use of light. The emphasis is given to electrical fields in gas sensors, which cause the Electroadsorptive Effect. The effect has long been known by experts working in the field, but has been regarded as too difficult for use until recently because of increasing sensor miniaturization. The book will serve as an introduction to sensitivity tuning of semiconductor gas sensors, introducing the underlying theory and experimental models before moving on to design considerations, applications and market considerations. A literature review and examples of experimental data are included.
Download or read book Environmental Gas Sensing with High Surface Area Nanomaterials on a Low power Microfabricated Heater Platform written by Anna Claire Harley-Trochimczyk and published by . This book was released on 2016 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gas sensors can provide information about the presence of dangerous gases in industrial and residential sites, allowing for improved environmental protection and human health and safety. In order to enable ubiquitous wireless monitoring of combustible and toxic gases, sensor elements with low power consumption are required. Two common types of gas sensors, namely calorimetric and conductometric sensors, rely on heated sensor elements to activate the appropriate reactions with the gas of interest, resulting in high power requirements to maintain the necessary operating temperatures. Miniaturized gas sensors made with microfabricated heater platforms and nanoscale sensing materials can lead to low power sensor elements with high performance. The minimization of the power consumption cannot be at the expense of the sensor’s ability to detect dangerous combustible and toxic gases. The sensing performance is impacted by the properties of both the microheater and the sensing material, as well as the integration of the two elements, creating significant opportunity for research and development to improve the performance parameters, such as sensitivity, detectable concentration range, selectivity, response and recovery time, stability, size, manufacturability, and cost, as well as power consumption. The development approach described in the following thesis relies on an optimized microheater platform as well as novel sensing materials. The design, fabrication, and characterization of a low-power microheater platform is described, with polycrystalline silicon as the heater material for moderate temperature and polycrystalline silicon carbide for improved reliability at high temperature operation. A small, isolated heated area decreases the required power consumption and a closed membrane facilitates easier deposition of sensing materials. Sensing materials for combustible and toxic gas detection have been developed based on ultra high surface area aerogels. For combustible gas sensing, graphene or boron nitride aerogel acts as a scaffold for catalytic platinum or palladium nanoparticles. Bare graphene aerogel and graphene aerogel coated with single to few-layer molybdenum disulfide sheets are used for toxic gas detection. The microheater platform with fast response and recovery times provides opportunities for localized, in-situ synthesis of high surface area sensing materials. The use of the microheater platform for localized growth of a nanocrystalline tin oxide sensing film is described. The fast thermal response of the microheater leads to rapid heating of the precursor, creating a highly porous film that is proven beneficial for toxic gas sensing.
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2009 with total page 810 pages. Available in PDF, EPUB and Kindle. Book excerpt:
