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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 94 for “"Chemical sensors"”.
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Magnetoacoustic chemical sensors based on swellable polymer microspheres
… goal of this dissertation was to investigate chemical applications of magnetoacoustic sensors based on swellable polymer microspheres. The magnetoacoustic sensor was used to monitor viscosity of starch solution, water loading, and 2-hydroxyethyl methacrylate …
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Interconnection, Interface And Instrumentation For Micromachined Chemical Sensors
In realizing a portable chemical analysis system, adequate partitioning of a reusable component and a disposable is required. For successful implementation of micromachined sensors in an instrument, reliable methods for interconnection and interface are in great demand between these two major …
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A microelectronic design for low-cost disposable chemical sensors
… microelectronics for a low-cost disposable chemical sensor. The critical aspects of this chemical sensor are the performance of the microelectronic chip and how this chip integrates and interfaces with the resistive sensors that detect chemicals. The design, simulation, and implementation of …
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Non-silicon Microfabricated Nanostructured Chemical Sensors For Electric Nose Application
… micro-electro-mechanical-system (MEMS) based gas sensors. Novel sensors have been designed, fabricated and tested. Nanocrystalline semiconductor metal oxide (SMO) materials include SnO2, WO3 and In2O3 have been studied for gas sensing applications. Different doping material such as copper, silver, …
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Meso-scale fluidic devices with chemical sensors for biological applications
… devices with integrated oxygen and humidity sensors for potential applications to hydrotropic and oxytropic studies of small plant roots have been investigated in this study. Meso-scale sensor platform was fabricated using porphyrine complex as the sensitive dye embedded within Ethyl …
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Technological Development of Chemical Sensors for Healthcare and Safety Applications
The development of Point-of-Use (PoU) sensors is driven to provide simple, rapid and reliable test results for applications that require quantitative analysis, in particular in resource-limited settings. To bring a more comprehensive range of tests into the PoU, there is a need to evaluate and …
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Wirelessly addressable chemiresistors : carbon nanotube-based chemical sensors and dosimeters
… 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 …
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Chemical sensors based on swellable polymer microparticles and molecular imprinted polymers
… were prepared for the development of chemical sensors for various target analytes. The swelling and shrinking of the polymer particles as a function of concentration of target analytes has been investigated using turbidity and fluorescence measurements at suitable pH …
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Planar integrated optical waveguide chemical sensors and novel transducer layer materials
… integrated optical waveguide (IOW) technology to chemical sensor development results in very sensitive, fast-response devices. The additional dimension of selectivity that is possible in these devices, through the ability to select an analytical wavelength of light particular to only a specific …
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Polymer and carbon nanotube materials for chemical sensors and organic electronics
… of new materials for high-performance chemical sensing as well as organic electronic applications. In Chapter 2, we develop a chemiresistive material based on single-walled carbon nanotubes (SWCNTs) and hexafluoroisopropanol (HFIP) functionalized polythiophene, with a largely simplified …
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Chemical sensors based on swellable molecularly imprinted polymer microspheres in a hydrogel
<p>A novel design of chemical sensors based on swellable molecularly imprinted polymer microspheres is presented. These sensors were successfully used to measure norephedrine and theophylline in water and in buffer at neutral pH.</p><p>A new method was developed for preparing swellable norephedrine …
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Laser spectroscopic trace chemical sensors for environmental sensor networks and portable medical devices
… of the first laser spectroscopy based trace-gas sensors with sensor characteristics which simultaneously satisfy low cost, handheld footprint, low power, and long term autonomous operation while still providing part-per-billion detection sensitivity and negligible interference to enable trace gas …
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Chemical sensors based on swelling polymer microspheres and uncrosslinked fluorescently-labelled molecularly imprinted polymers
… in polymer size, it is possible to make a chemical sensor.</p><p>Polymer microspheres that change size as a function of pH and metal ion concentration have been prepared by suspension and dispersion polymerization respectively. For the pH sensor, poly (vinylbenzylchloride) was prepared by …
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XANTHENE AND SILICON ANALOGS OF XANTHENE FLUOROPHORES AS CHEMICAL SENSORS FOR pH AND HYPOCHLOROUS ACID
Chemical sensors capable of detecting a specific atom or molecule under various conditions have been utilized in biological and environmental analyses. Fluorescence based sensors are particularly advantageous in these studies because of their high sensitivity, relative ease in handling, and low …
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The Electroadsorption Field Effect Transistor : numerical and experimental treatment of chemisorption on nanostructured chemical sensors
… catalysis, nanoelectronics, and trace chemical detection. The purpose of this thesis is to illuminate this process by means of an investigation that utilizes the electric field effect to control surface chemistry and is both theoretical and experimental in nature. In addition, a …
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Development Of Single And Array Electro-Chemical Sensors For Real-Time Trace Metal Analysis In Aqueous Environmental Media
… applications. While traditional electrochemical techniques have played critical roles in this field, their usefulness is limited by temporal resolution, Hg toxicity and stability concerns. Recently, we developed a method using fast-scan cyclic voltammetry (FSCV) at carbon-fiber …
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The Development of Ionophore-Selective Based optical chemical sensors for the determination of heavy metal ions in aqueous environments
The development of optical sensors for in-situ, real-time and low-cost monitoring of heavy metal ions is a tremendously and fast growing area of research. This work presents several novel sensing strategies for developing optical chemical sensors that can be used as early warning devices for heavy …
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Design of a silicon carbide micro-hotplate geometry for high temperature chemical sensing
Silicon carbide, high temperature, chemical sensors are the next step in chemical detection technology; allowing for the development of low cost, robust, lower power, and widely applicable chemical sensors. SiC offers the thermal conductivity, electrical properties, and operating temperatures not …
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Nuevas sondas cromo-flurogénicas a partir de derivados organopaladio y compuestos indénicos
… Fluorogenic and chromogenic molecular chemical sensors have become extremely important in the chemical science. These systems are doubly interesting; first from the point of basic research, they study the host-guest interactions, mediated by a dyestuff, oriented to the signalling of …
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Long Period Grating-Based pH Sensors for Corrosion Monitoring
… develop, fabricate and test optical fiber-based chemical sensors for monitoring corrosion from early stages through the entire corrosion event. Although there are several preventative methods under development to address the problem of corrosion degradation, new techniques are still needed that …
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