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 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 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 Carbon Nanotubes written by Ann Rose Abraham and published by CRC Press. This book was released on 2022-10-06 with total page 341 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new book discusses a selection of advanced topics on carbon nanotubes—their extraordinary properties, structure, design, fabrication, development, engineering, functionalization, carbon nanotube enabled nanocomposites, characterization, and, moreover, their utility in many applications. The volume highlights the amazing potential of advanced CNT composites in automotive, aeronautics, spacecrafts, transistors replacing Si electronics, energy, purification, hydrogen storage, tissue regeneration, electrochemical supercapacitors, sensing, biomedical applications, agriculture, energy, and technical applications. The book specifically discusses the applications of carbon nanotubes for a greener environment, as well as applications for biomedical uses, in drug delivery, and in display technology. It also explores the uses of CNTs in the energy and aerospace industries, such as for solar energy conversion, as a lubricant additive for enhancing energy efficiency, and more. Other chapters explore the potential of carbon nanotubes in hydrogen storage and carbon nanotube electronics.

Download or read book Carbon Nanomaterials and their Nanocomposite Based Chemiresistive Gas Sensors written by Shivani Dhall and published by Elsevier. This book was released on 2023-01-20 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon Nanomaterials and their Nanocomposite-Based Chemiresistive Gas Sensors: Applications, Fabrication and Commercialization sets out how carbon nanomaterials based chemiresistive gas sensor are made, and their applications at lab and industrial levels. The book focuses on major advances in the field of chemiresistive gas sensors in recent years and their potential applications in environmental monitoring and healthcare. Carbon Nanomaterials and their Nanocomposite-Based Chemiresistive Gas Sensors: Applications, Fabrication and Commercialization provides systematic and effective guidelines to the researchers as well as learners about sensor, their fabrication and applications. Chemiresistive sensors are widely used in automation of numerous industrial processes as well as for everyday monitoring of various activities as public safety, engine performance, medical therapeutics, and in many other situations hence the book will catch the attention of readers and motivate them for advanced research for the development of smart and efficient gas sensors. With full coverage of the state of the art in this active research field, the book will appeal to researchers in a broad range of disciplines, including nanotechnology, engineering, materials science, chemistry and physics. Offers a one-stop resource, bringing together information currently scattered over journal papers, industrial/lab outcomes and project reports Presents information about the properties, synthesis of nanomaterials, their device fabrication and applications as sensing materials Combining fundamental, experimental and theoretical knowledge with industrial needs and engineering design methods

Download or read book Carbon Based Nanomaterials and Nanocomposites for Gas Sensing written by Navinchandra Gopal Shimpi and published by Elsevier. This book was released on 2022-10-12 with total page 267 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon-Based Nanomaterials and Nanocomposites for Gas Sensing discusses the state of the art, emerging challenges, properties, and opportunities of various carbon-based nanomaterials and nanocomposites, for their application in smart gas sensors. The book focuses on various carbon-based nanomaterials and their nanocomposites, sensing mechanism, device fabrication, and their application for the sensing of various hazardous gases. This is important for several industries, environmental monitoring, and human healthcare, due to increased industrialization. Carbon-Based Nanomaterials and Nanocomposites for Gas Sensing provides systematic and effective guidelines for researchers who want to gain a fundamental understanding of how this class of materials is being used for gas sensing. Since these sensors can be applied for the automation of numerous industrial processes, as well as for everyday monitoring of various activities, such as public safety, engine performance, medical therapeutics, and in many other situations, this book will catch the attention of readers and motivate them for advanced research in the development of smart and efficient gas sensors. Offers a one-stop resource, bringing together information currently scattered over journal papers and project reports Presents a focused concept reflecting the properties, synthesis, and sensing capabilities of carbon-based nanomaterials and their composites Combines fundamental experimental and theoretical information with industrial needs and engineering design methods

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 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 Polymer and Covalent Functionalization of Single Walled Carbon Nanotubes for Electronic Sensor Applications written by John Francis Fennell (Jr.) and published by . This book was released on 2017 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, chemiresistive devices for the detection of volatile organic compounds to include chemical warfare agents are developed. Active sensing materials were produced by crafting composites of synthetic polymers and single walled carbon nanotubes. Sensitivity to and selectivity for target analytes were augmented by the introduction of molecular recognition elements into polymer side chains or by the addition of additives into a polymer/single walled nanotube composite. Additionally, methods to create n-type single walled carbon nanotubes through covalent side wall functionalization were explored. Chapter 1: Chemiresistive sensors are becoming increasingly important as they offer an inexpensive option to conventional analytical instrumentation, they can be readily integrated into electronic devices, and they have low power requirements. Nanowires (NWs) are a major theme in chemosensor development. High surface area, inter-wire junctions, and restricted conduction pathways give intrinsically high sensitivity and new mechanisms to transduce binding or action of analytes. This chapter details the status of NW chemosensors with selected examples from the literature. We begin by proposing a framework for understanding electrical transport and transduction mechanisms in NW sensors. Next, we offer the reader a review of device performance parameters. Then, we consider the different NW types followed by a summary of NW assembly and different device platform architectures. Subsequently, we discuss NW functionalization strategies. Finally, we propose a roadmap for future developments in NW sensing that addresses selectivity, sensor drift, sensitivity, response analysis, and emerging applications. The NW field is still in its infancy, and continuing advances present abundant opportunities. Chapter 2: Chemical warfare agents (CWA) continue to present a threat to civilian populations and military personnel in operational areas all over the world. Reliable measurements of CWAs are critical to contamination detection, avoidance, and remediation. The current deployed systems in United States and foreign militaries, as well as those in the private sector offer accurate detection of CWAs, but are still limited by size, portability and fabrication cost. Herein, we report a chemiresistive CWA sensor using single-walled carbon nanotubes (SWCNTs) wrapped with poly(3,4-ethylenedioxythiophene) (PEDOT) derivatives. We demonstrate that a pendant hexafluoroisopropanol group on the polymer that enhances sensitivity to a nerve agent mimic, dimethyl methylphosphonate, in both nitrogen and air environments to concentrations as low as 5 ppm and 11 ppm, respectively. Additionally, these PEDOT/SWCNT derivative sensor systems experience negligible device performance over the course of two weeks under ambient conditions. Chapter 3: The detection of alkylating agents using carbon nanotube chemiresistive devices has confounded researchers in the sensor field for quite some time. In this work, we address this quandary by fabricating a chemiresistive device consisting of poly(4-vinylpyridine)/single walled carbon nanotube/lithium bromide composites that is able to detect gaseous ethylene oxide (EtO) and a mustard agent simulant, 2-chloroethyl ethylsulfide (CEES). Our devices were sensitive to EtO and CEES down to 1048 ppm and 33 ppm, respectively. We calculated theoretical detection limits of 212 ppm for EtO and 10 ppm for CEES. These results should encourage researchers in the field to tackle analytes once thought to be undetectable via carbon nanotube chemiresistive devices, as they offer a low cost and low power alternative to current options. Chapter 4: The covalent functionalization and characterization of single walled carbon nanotubes (SWCNTs) by dihalocarbenes and the trifluoromethylating Togni's reagent is explored in this chapter. Covalent functionalization reactions were performed to increase the SWCNT solubility, imparting n-type semiconducting behavior while maintaining the native conductivity of the conjugated sp2 network. Previous computational studies predicted the conservation of the electrical conductivity of SWCNTS after carbene additions, but experimental work to verify the electrical properties has not been performed. In the studies presented herein, we utilized five different covalent functionalization methods to modify SWCNTs and utilized X-ray photoelectron spectroscopy (XPS) in tandem with Resonance Raman spectroscopy to characterize our products. Though electrical characterization was not performed, we improved upon literature methods concerning the dichlorocarbene addition of -CCl2 groups to pristine SWCNTs.

Download or read book Carbon Nanomaterials Based Sensors written by Jamballi G. Manjunatha and published by Elsevier. This book was released on 2022-04-28 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon Nanomaterials-Based Sensors: Emerging Research Trends in Devices and Applications covers the most recent research and design trends for carbon nanomaterials-based sensors for a variety of applications, including clinical and environmental uses, and more. Carbon nanomaterials-based sensors can be used with high sensitivity, stability and accuracy compared to other techniques. Written by experts in their given fields from around the world, this book helps researchers solve the particular challenges they face when developing new types of sensors. It instructs how to make sensitive, selective, robust, fast-response and stable carbon nanomaterial-based sensors, as well as how to utilize them in real life. Covers the environmental monitoring and analytical implications of electro-analytical methods, one of the most dynamically developing branches of carbon nanomaterials Includes a complete discussion of functionalized nanostructure materials reformulated with noble materials and advanced characteristics for improved applications when compared to standard materials Covers sustainability and challenges in the commercialization of carbon nanomaterials-based sensors

Download or read book Nanosensors for Smart Manufacturing written by Sabu Thomas and published by Elsevier. This book was released on 2021-06-10 with total page 634 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanosensors for Smart Manufacturing provides information on the fundamental design concepts and emerging applications of nanosensors in smart manufacturing processes. In smart production, if the products and machines are integrated, embedded, or equipped with sensors, the system can immediately collect the current operating parameters, predict the product quality, and then feed back the optimal parameters to machines in the production line. In this regard, smart sensors and their wireless networks are important components of smart manufacturing. Nanomaterials-based sensors (nanosensors) offer several advantages over their microscale counterparts, including lower power consumption, fast response time, high sensitivity, lower concentration of analytes, and smaller interaction distance between sensors and products. With the support of artificial intelligence (AI) tools such as fuzzy logic, genetic algorithms, neural networks, and ambient intelligence, sensor systems have become smarter. This is an important reference source for materials scientists and engineers who want to learn more about how nanoscale sensors can enhance smart manufacturing techniques and processes. Outlines the smart nanosensor classes used in manufacturing applications Shows how nanosensors are being used to make more efficient manufacturing systems Assesses the major obstacles to designing nanosensor-based manufacturing systems at an industrial scale

Download or read book Carbon Nanotubes for Energy and Environmental Applications written by Soney C. George and published by CRC Press. This book was released on 2022-10-27 with total page 309 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new book, Carbon Nanotubes for Energy and Environmental Applications, covers the timely issue of green applications of carbon nanotubes. It covers the diverse usages of carbon nanotubes for the sensing of environmentally hazardous chemicals, for water purification, for the protection of the environment, and for new energy applications. The development of highly sensitive CNT-based gas sensors for air pollution monitoring, for green synthesis of carbon nanotubes, and for green energy applications are discussed in this volume. The diverse topics in the volume include nanodiamonds for energy storage, new lubricant additives that enhance energy efficiency, how carbon nanotubes can be applied in the food and agricultural sectors, the use of CNTs in water purification and desalination, carbon nanotubes-based electrochemical sensors for environmentally hazardous chemicals, and much more. This timely book addresses a need of the hour and will provide valuable for environmentally conscious industry professionals, faculty and students, and researchers in materials science, engineering, physics, and chemistry with interest in nanomaterials.

Download or read book Functionalized Double walled Carbon Nanotubes for Integrated Gas Sensors written by Lin Yang and published by . This book was released on 2017 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: We have successfully fabricated gas sensors based on chemically functionalized double-wall carbon nanotubes (DWCNTs) using a robust and low cost process. The DWCNTs were synthesized by catalytic chemical vapor deposition (CCVD) method. They were then purified before functionalization (oxidation, amination, and fluorination). The sensor devices were fabricated by soft lithography using PDMS (Poly-DiMethylSiloxane) stencils and liquid phase pipetting of a suspension of chemically functionalized DWCNTs in deionized water, rinsing and finally drying in a nitrogen flow. Each device (1 cm x 2 cm) is equipped with a set of 7 DWCNT based resistors. Each resistor can accommodate a precise chemical functionalization for targeting a specific gas species, allowing a multiplexed (up to 7) detection. Due to their small size and the possibility to fabricate them on soft substrates, they could be used for many kinds of applications including wearable devices. The electrical resistance of the produced resistors turned out to decrease with temperature, suggesting fluctuations induced tunneling conduction through the disordered network of metallic nanotubes. However, we have shown in our work that for realistic applications, gas sensing can be achieved without any temperature regulation of our devices, because the variations of electrical conductance caused by gas molecules adsorption are significantly larger than those caused by possible temperature fluctuations. The as fabricated devices exhibit at room temperature a metallic conducting behavior. Devices with a resistance less than 100 kO were selected for gas detection. Because the sensing principle is based on the direct measurement of the resistance, our scheme ensures low power consumption (

Download or read book Development of Carbon Nanotube based Gas and Vapour Sensors and Supramolecular Chemistry of Carbon Nano materials written by Lee John Hubble and published by . This book was released on 2009 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: [Truncated abstract] The scientific endeavours described within this thesis attempt to create novel solutions to current scientific, commercial and industrial downfalls, and contribute to the advancement of technologies in these areas. This has been achieved through the application of theoretical and experimental principles, entrenched in the domains of chemistry and physics, which have been harnessed to assist in the transformation from nanoscience to nanotechnology. These solutions range from unique supramolecular systems capable of selective-diameter enrichment of single-walled carbon nanotubes (SWCNTs), to the fabrication of low-cost, potentially remote deployable carbon nanotube-based gas and vapour sensors, and expand right through to the development of water-soluble fluoroionophoric sensors and manipulations of a molecular form of carbon in constructing all-carbon nano-architectures. For the advancement and successful integration of carbon nanotubes (CNTs) into commercial processes, the advent of scalable separation protocols based on their electronic properties is required. SWCNTs have been successfully solubilised using water-soluble p-phosphonated calix[n]arenes (n = 4, 6, 8) and 'extended arm' upper rim functionalised (benzyl, phenyl) p-sulfonated calix[8]arenes. Selective SWCNT diameter solubilisation has been demonstrated and subsequent preferential enrichment of SWCNTs with semiconducting or metallic electronic properties has been achieved. In addition, semiconducting nanotube-enriched supernatants (liquid) have been utilised to fabricate on/off field effect transistors (FET). These water-soluble supramolecular systems can be incorporated into post-growth purification protocols, with direct implications in areas such as carbon nano-electronics and device fabrication. In the current global environment there is a heightened level of public and governmental disquiet due to the reality of impending terrorist attacks. This is compounded by the inherent ease of manufacture and effectiveness of specific chemical warfare agents (CWAs) used in small-scale terrorist operations. ... Additional all-carbon structures are described with the formation of rings of helical SWCNT bundles through post-growth SWCNT modifications, and a variety of fibrous all-carbon structures, most notably novel square-geometry carbon nano-fibres (CNFs), through catalytic-chemical vapour deposition (C-CVD) synthesis strategies. The current requirement for entirely water-soluble fluorescent sensors is routinely documented in the literature. The autofluorescence properties of p-phenyl-sulfonated calix[8]arene are characterised and this water-soluble cavitand is surveyed as a metal cation sensor candidate. This particular system was found to exhibit a change in fluorescence response when exposed to divalent metal cations, and interactions with [UO2]2+, Pb2+, Co2+, and Cu2+ ions are discussed in detail. The system is characterised through a variety of analytical techniques to yield sensor calibration data, degradation characteristics, pH sensitivity and suitability as a 'small molecule' drug-carrier.

Download or read book Carbon Nanotubes written by Michael J. O’Connell and published by CRC Press. This book was released on 2018-10-03 with total page 339 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since their discovery more than a decade ago, carbon nanotubes (CNTs) have held scientists and engineers in captive fascination, seated on the verge of enormous breakthroughs in areas such as medicine, electronics, and materials science, to name but a few. Taking a broad look at CNTs and the tools used to study them, Carbon Nanotubes: Properties and Applications comprises the efforts of leading nanotube researchers led by Michael O’Connell, protégé of the late father of nanotechnology, Richard Smalley. Each chapter is a self-contained treatise on various aspects of CNT synthesis, characterization, modification, and applications. The book opens with a general introduction to the basic characteristics and the history of CNTs, followed by discussions on synthesis methods and the growth of “peapod” structures. Coverage then moves to electronic properties and band structures of single-wall nanotubes (SWNTs), magnetic properties, Raman spectroscopy of electronic and chemical behavior, and electromechanical properties and applications in NEMS (nanoelectromechanical systems). Turning to applications, the final sections of the book explore mechanical properties of SWNTs spun into fibers, sidewall functionalization in composites, and using SWNTs as tips for scanning probe microscopes. Taking a fresh look at this burgeoning field, Carbon Nanotubes: Properties and Applications points the way toward making CNTs commercially viable.

Download or read book Functionalization and Fabrication of Single walled Carbon Nanotube based Chemiresistors for Sensory Applications written by Kelvin Mitchell Frazier and published by . This book was released on 2015 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chemical sensors that identify and monitor volatile organic compounds (VOCs) have an important role in assessing public security, food and water quality, industrial environment, and health. The fabrication of carbon-based sensors by printing, dip coating, drop casting, or drawing has advantages of being simple and low-cost without the need for highly specialized facilities. We have investigated the fabrication of sensors both by drop casting and drawing. Single-walled carbon nanotubes (SWCNT) electronic and spectroscopic properties for sensory applications are described. SWCNTs have unique properties wherein their conductance can be altered by environmental effects. These carbon nanomaterials can be easily integrated into a chemiresitive device to detect various analytes. In our studies using the drop cast method, we noncovalently functionalized SWCNT with a trifunctional selector that has three important properties: it noncovalently functionalizes SWCNTs with cofacial n-n interactions, it binds to cyclohexanone (a target analyte for explosive detection) via hydrogen bond, and it improves the overall robustness of SWCNT-based chemiresistors (e.g., humidity and heat). In our other studies, we fabricated sensors by drawing. Abrasion is a safe, simple, solvent-free, and low cost method for deposition of carbon-based materials onto a substrate. We successfully demonstrated fabrication on a wide variety of substrates (e.g., weighing paper, polymethyl methacrylate, silicon, and adhesive tape) of fully-drawn chemical sensors on a chip that can detect in real time parts-per-million (ppm) quantities of various vapors using SWCNTs as sensing materials and graphite as electrodes. This fabrication methodology does not require specialized facilities (e.g., clean room, thermal evaporator) and can be performed entirely on a desktop (with appropriate ventilation and safety precautions for handling nanomaterials). We also extended the abrasion method to detect anions such as fluoride (use to manufacture nuclear weapons) and cyanide (chemical warfare agent). These sensor are highly sensitive detecting the United State Environmental Protection Agency (EPA) maximum contaminant level (MCL) of fluoride and cyanide selectively.

Download or read book Wirelessly Addressable Chemiresistors written by Joseph Michael Azzarelli and published by . This book was released on 2016 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: In Chapter 1, we develop a brief tutorial on chemiresistive sensors and our rationale for choosing nanowires (NWs), specifically carbon nanotubes (CNTs), as the basis for chemiresistor research. Due to their high surface area, interwire junctions, and restricted conduction pathways, NWs give intrinsically high sensitivity and new mechanisms to transduce the binding or action of analytes. We explore principles for understanding electrical transport and transduction mechanisms in NW sensors. Next, we offer the reader a review of chemical sensor device performance parameters. Then, we summarize NW assembly and different device platform architectures. Subsequently, we discuss CNT functionalization strategies. Finally, we propose future developments in NW sensing to address selectivity, sensor drift, sensitivity, response analysis, and emerging applications. In Chapter 2, we describe a rapid, solvent-free, two-step procedure for the fabrication of selective gas and vapor sensors from carbon nanotubes and graphite on the surface of paper that overcomes challenges associated with solvent-assisted chemical functionalization and integration of these materials into devices. The first step generates solid composites from carbon nanotubes (or graphite) and small molecules (chosen to interact with specific types of gases and vapors) by mechanical mixing and subsequent compression into a form similar to a conventional pencil "lead." The second step uses mechanical abrasion ("drawing") of these solid composites on the surface of paper to generate functional devices. The use of diverse composites yields sensing arrays capable of detecting and differentiating gases and vapors at part-per-million concentrations. In Chapter 3, we describe an adaption of near-field communication (NFC) technology toward portable, wireless, non-line-of-sight gas phase chemical sensing. The result is a Chemically Actuated Resonant Device (CARD). We demonstrate the ability to convert inexpensive commercial NFC tags into chemical sensors that detect and discriminate analytes at part-per-thousand and part-per-million concentrations. This effort merges rational design of conductive nanostructured materials for selective chemical sensing with portable and widely distributed NFC technology to deliver a new method of acquiring chemical information about an NFC tag's local environment. We introduce a concept for distributed chemical sensing by the growing number of people that carry NFC-enabled smartphones, tablets, and other smart devices. We highlight second-generation NFC-based chemical sensor circuit designs that generalize turn-on/turn-off functionality. Finally, we devise a new Chemically Actuated Resonant Device (CARD) architecture that simplifies device fabrication to a single step and unambiguously relates change in chemiresistance to a wireless CARD readout. In Chapter 4, we describe a single-use wearable hazard badge that dosimetrically detects diethylchlorophosphate (DCP), a model organophosphorous cholinesterase inhibitor simulant. To provide selective and readily manufacturable sensor elements, we developed an ionic liquid-mediated single walled carbon nanotube based chemidosimetric scheme capable of detecting DCP across a broad dynamic range with limits of detection of 28 parts-per-billion (ppb). Furthermore, we have established a relationship between CARD readout and exposure dose, which can be generalized for any dosimeter developed with this device architecture. The device's practical utility is demonstrated wherein an 8-hour workday time weighted average equivalent exposure of 10 ppb DCP effects an irreversible change in smartphone readout. Finally, we show that the device is selective for DCP by screening against 8 commonly encountered interferent gases and vapors. In Chapter 5, we seek to develop an alkene dosimeter by exploiting known [4+2] cycloaddition chemistries. Specifically, di-substituted- 1,2,4,5-tetrazines are employed as a model inverse-electron demand Diels-Alder agent for the dosimetric detection of ethylene. Possible device architectures and fabrication strategies are explored, including colorimetric and chemiresistive implementations. A new solid/liquid chemiresistor fabrication method is demonstrated, and future directions for improving the sensitivity of diene-type alkene dosimeters are discussed.