Download or read book Single Walled Carbon Nanotube Network Gas Sensor written by Sunglyul Maeng and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Development of Functionalized Single walled Carbon Nanotube Gas Sensors written by Ting Zhang and published by . This book was released on 2007 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Metal and Metal Oxide Nanoparticles Functionalized Single walled Carbon Nanotube Based Gas Sensors written by Syed Mubeen Jawahar Hussaini and published by . This book was released on 2009 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Gas Sensor Evaluation and Application of Single walled Carbon Nanotubes to Gas Sensing written by Go Hyun Chung and published by . This book was released on 2006 with total page 104 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 Single walled Carbon Nanotube SWNT Based Chemical Sensors for Gas Detection written by Han Zhang and published by . This book was released on 2010 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Gas Sensors written by Ankur Gupta and published by CRC Press. This book was released on 2022-11-28 with total page 493 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers the whole range of gas sensing aspects starting from basics, synthesis, processing, characterization, and application developments. All sub-topics within the domain of gas sensors such as active materials, novel nanomaterials, working mechanisms, fabrication techniques, computational approach, and development of microsensors, and latest advancements such as the Internet of Things (IoT) in gas sensors, and nanogenerators, are explained as well. Related manufacturing sections and proposed direction of future research are also reviewed. Features: Covers detailed state-of-the-art specific chemiresistive sensing materials. Presents novel nanomaterial platforms and concepts for resistive gas sensing. Reviews pertinent aspects of smart sensors and IoT sensing. Explains nanotechnology-enabled experimental findings, and future directions of smart gas sensing technology. Explores implication of latest advancements such as IoT in gas sensors, and nanogenerators. This book is aimed at academic researchers and professionals in sensors and actuators, nanotechnology, and materials science.

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 Smart Sensors and Sensing Technology written by Gourab Sen Gupta and published by Springer Science & Business Media. This book was released on 2008-07-01 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: Technological advancements in recent years have enabled the development of tiny, cheap disposable and self contained battery powered computers, known as sensor nodes or “motes”, which can accept input from an attached sensor, process this input and transmit the results wirelessly to some interested device(s). When a number of these nodes work together, conceivably up to hundreds of thousands, a Wireless Sensor Network (WSN) is formed. Research in the area of wireless sensor networks has become increasingly wid- pread in recent years, partly due to their wide range of potential uses and also partly due to the fact that the technology enabling such networks is now widely available from many di?erent suppliers, such as: Crossbow, MoteIV, Intel and SUN (java based motes). These wireless sensor networks have the potential to allow a level of integration between computers and the physical world that, to date, has been virtually impos- ble. The uses for such networks is almost limitless and include such diverse app- cations as a counter sniper system for urban warfare [1] tracking the path of a forest re [2], determining the structural stability of a building after an earthquake [3], or tracking people or objects inside a building [4], etc.

Download or read book Sensitivity Selectivity and Stability of a Palladium loaded Single walled Carbon Nanotube Methane Gas Sensor written by Melissa Keiko McGee and published by . This book was released on 2017 with total page 55 pages. Available in PDF, EPUB and Kindle. Book excerpt: There exists a need to detect methane (CH4) gas, and optical sensors provide many advantages over electronic sensors. Single-walled carbon nanotubes (SWNT) can be used as optical sensors, as SWNTs emit fluorescence upon photoexcitation. The photoluminescent (PL) intensity upon excitation depends on the electronic structure of the SWNT. Here, SWNTs are loaded with palladium (Pd) nanoparticles using sodium dodecyl sulfate (SDS). The Pd-loaded SWNTs offer a detection mechanism for methane (CH 4) by comparing the PL intensity before and after exposure to CH4.A significant PL change (relative to the experiment) indicates a "turn-on" response to CH4 Preliminary experiments showed no response to CH4 at zero and high (>10mM) Pd loading in both aqueous solution and film, indicating that there must be an optimal Pd concentration in the middle. This optimal loading for methane response was found to be in the range 2.61mM - 5.21mM Pd2+. The Pd-SWNTs in aqueous solution showed selectivity to CH4 over nitrogen gas (N2 and ambient air (20-22% O2). SDS-SWNT (the control) showed a significant response to N2 and air while Pd-SWNTs in aqueous solution showed the greatest response to methane. In film, the optimal Pd-loading (5.21mM) for sensitivity was found to exhibit an inexplicable high response to N2 but still displayed selectivity to methane over ambient air. Pd-SWNTs in aqueous solution and film showed stability of response over time. Pd- SWNTs in aqueous solution maintained the PL intensity with a minor decrease (3- 19% decrease) in Day 14 as compared to Day 1. Pd-SWNT in aqueous solution showed turn-on response under the methane gas in Day 14. In film, the optimal Pd-loading (5.21mM) and a lower Pd-loaded SWNT (2.61mM) displayed a turn-on response to methane after 14 days, showing stability in response over time. This work has thus demonstrated an optimally Pd-loaded SWNT that is sensitive, selective, and stable over time to methane gas.

Download or read book Carbon Nanotube Based Sensors written by Anindya Nag and published by CRC Press. This book was released on 2024-05-02 with total page 355 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon Nanotube-Based Sensors: Fabrication, Characterization, and Implementation highlights the latest research and developments on carbon nanotubes (CNTs) and their applications in sensors and sensing systems. It offers an overview of CNTs, including their synthesis, functionalization, characterization, and toxicology. It then delves into the fabrication and various applications of CNT-based sensors. FEATURES Defines the significance of different forms of CNT-based sensors synthesized for diverse engineering applications and compares the feasibility of their generation Helps readers evaluate different types of fabrication techniques to generate CNTs and their subsequent sensing Discusses fabrication of low-cost, efficient CNTs-based sensors that can be used for diverse applications and sheds light on synthesis methods for a range of printing techniques Highlights challenges and advances in security-related issues using CNTs-based sensors This book is aimed at researchers in the fields of materials and electrical engineering who are interested in the development of sensor technology for industrial, biomedical, and related applications.

Download or read book Characterizing the Role of Defects on the Sensing Performance of Carbon Nanotube and Graphene Based Gas Sensors written by Kevin Y. Lin and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The major theme of this thesis is to investigate the influence of defects on the sensing mechanisms and performance of gas sensors made from films of carbon nanotubes, chemical vapor deposition (CVD) graphene film, CVD graphene ribbons, and surfactant exfoliated graphene. The definition of defects on carbon materials is the disordered carbon atoms formed due to dislocations, vacancies, and deformations. These defects were introduced during processing. The thesis is separated into three sections that analyze various types of defects on these carbon based chemical sensors. First section focuses on single-walled carbon nanotubes with point defects. It will be demonstrated that these point defects can alter the main sensing mechanism of the CNT based sensors. There is a controversy in literature on whether the sensing response seen in carbon nanotube chemiresistors is associated with a change in the resistance of the individual carbon nanotubes or changes in the resistance of the junctions. A network analysis was carried out to better understand the relative contributions of the carbon nanotubes and the junctions on the change in resistance of the carbon nanotube network. It was found that the dominant mode of detection in carbon nanotube networks changes according to the defect level in the carbon nanotubes which may explain the apparently contradictory results in the literature. With high concentration of the point defects in the carbon nanotube film along with applying high electric field, the Poole-Frenkle conduction regime can be induced. Generally, desorption of gases from carbon nanotubes is a slow process that limits the carbon nanotubes0́9 utility as sensors. It will be demonstrated that electron flows in the carbon nanotube above the Poole-Frenkel conduction threshold can stimulate adsorbates to desorb without heating the sensor significantly. This desorption process is analogous to electron stimulated desorption, but with an internally conducted rather than externally applied source of electrons. As a result, this gives a fast and reversible CNT sensor within seconds. An application can be utilized to use carbon nanotubes based GC detector for multi-component chemical analysis. The approach is to use a CNT based detector in a series configuration with a gas chromatography column. It will demonstrated that a mixture of nine different compounds can be detected with these CNT based detectors when the detector operates in current stimulated desorption (CSD) mode. This is the first demonstration of a CNT based GC detector to analyze multi-component gas mixtures providing a new sensing approach for online air quality control and health monitoring applications. The second section of the thesis focuses on analyzing two-dimensional line defects arises from wrinkles and grain boundaries as well as edge defected created manually on the graphene film synthesized with chemical vapor deposition (CVD) process. Due to two-dimensional nature of the graphene film, adsorption of isolated analyte molecules on point defects has minimal effect on graphene resistance because current pathways can always form around the adsorbate. In contrast, analytes adsorbing on line defects lead to significant changes in resistance. It will be demonstrated that polycrystalline graphene easily obtained through chemical vapor deposition contains line defects. This can offer a scalable path to 50x more sensitive chemiresistors than mechanically exfoliated crystalline graphene. Moreover, current flow can be confined by cutting the polycrystalline graphene into ribbons, the sensitivity increases by another factor of four. These results show that polycrystalline graphene has extraordinary sensitivity, achieved through geometry and linear defect density. The last section of the thesis focuses on intrinsic two-dimensional edge defects on graphene isolated with sodium cholate surfactant assisted exfoliation of graphite powders. With this technique, it is possible to produce high edge defect concentrations for individual graphene island due to its micron-sized dimension offering more defects per unit area. Various randomly-stacked oxide-free graphene films can be formed with various filtration volumes. It will be demonstrated the films produced can range 6 orders of magnitude in film conductance. At thinner graphene films, the electron transport mechanism is mainly through two-dimensional variable range hopping. At thicker graphene films, electron transport is through fluctuation-assisted tunneling. It is also observed the graphene films go from semiconducting-like to metallic-like behavior at around 8 mL filtration volume. At low filtration volumes, oxide-free randomly stacked graphene film sensors showed better sensitivity towards target molecules compared to polycrystalline/ribbon graphene and defective CNT gas sensors due to two-dimensional electron hopping. As the graphene film thickness increases, there is a shift in conduction mechanism from two-dimensional electron hopping to metallic-like conduction which explains the drop in sensitivity as the filtration volume increases.

Download or read book Polypyrrole functionalized Single walled Carbon Nanotube Gas Sensor Arrays written by James Kakoullis (Jr.) and published by . This book was released on 2011 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt: Initially, the sensor's synthesis conditions in terms of PPY thickness on SWNTs networks by varying the electropolymerization charge of the monomer pyrrole in presence of LiClO[subscript 4] dopant for the sensing of NH[subscript 3] was optimized. Using the optimized polymerization charge of 1 [Mu]C determined previously, arrays of SWNTs-PPY hybrid sensors were fabricated by replacing dopant LiClO [subscript 4] by L-camphor sulfonic acid, D-camphor sulfonic acid, p-toluene sulfonic acid and sodium dodecyl sulfonate.

Download or read book Advanced Computational Nanomechanics written by Nuno Silvestre and published by John Wiley & Sons. This book was released on 2016-02-08 with total page 327 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contains the latest research advances in computational nanomechanics in one comprehensive volume Covers computational tools used to simulate and analyse nanostructures Includes contributions from leading researchers Covers of new methodologies/tools applied to computational nanomechanics whilst also giving readers the new findings on carbon-based aggregates (graphene, carbon-nanotubes, nanocomposites) Evaluates the impact of nanoscale phenomena in materials

Download or read book Single walled Carbon Nanotube Networks and Related Composite Materials for Gas Sensing Applications written by Gwyn P. Evans and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Carbon Nanotubes written by Mohammad Naraghi and published by BoD – Books on Demand. This book was released on 2011-08-09 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon Nanotubes are among the strongest, toughest, and most stiff materials found on earth. Moreover, they have remarkable electrical and thermal properties, which make them suitable for many applications including nanocomposites, electronics, and chemical detection devices. This book is the effort of many scientists and researchers all over the world to bring an anthology of recent developments in the field of nanotechnology and more specifically CNTs. In this book you will find: - Recent developments in the growth of CNTs- Methods to modify the surfaces of CNTs and decorate their surfaces for specific applications- Applications of CNTs in biocomposites such as in orthopedic bone cement- Application of CNTs as chemical sensors- CNTs for fuelcells- Health related issues when using CNTs

Download or read book Nanoscale Sensors written by Shibin Li and published by Springer Science & Business Media. This book was released on 2014-01-07 with total page 293 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a comprehensive introduction to nanoscale materials for sensor applications, with a focus on connecting the fundamental laws of physics and the chemistry of materials with device design. Nanoscale sensors can be used for a wide variety of applications, including the detection of gases, optical signals, and mechanical strain, and can meet the need to detect and quantify the presence of gaseous pollutants or other dangerous substances in the environment. Gas sensors have found various applications in our daily lives and in industry. Semiconductive oxides, including SnO2, ZnO, Fe2O3, and In2O3, are promising candidates for gas sensor applications. Carbon nanomaterials are becoming increasingly available as “off-the-shelf” components, and this makes nanotechnology more exciting and approachable than ever before. Nano-wire based field- effect transistor biosensors have also received much attention in recent years as a way to achieve ultra-sensitive and label-free sensing of molecules of biological interest. A diverse array of semiconductor-based nanostructures has been synthesized for use as a photoelectrochemical sensor or biosensor in the detection of low concentrations of analytes. A novel acoustic sensor for structural health monitoring (SHM) that utilizes lead zirconate titanate (PZT) nano- active fiber composites (NAFCs) is described as well.