Global ETD Search
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 sensing"”.
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Fluorescent Materials for Chemical Sensing
… π-electron conjugated molecular species for sensing and imaging are advantageous over other detection or identification methods such as colorimetric reporters. Fluorescent materials offer easy recognition of binding events due to the highly sensitive nature of fluorescence techniques down to …
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Chemical sensing using polypyrrole actuators
In the modern age methods for the calibration of sensors have become particularly important. Situations can arise where the deployment of sensors in the field, particularly in bulk, could be augmented to a very useful degree through the application of some form of autonomous monitoring system. This …
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Carbon nanotube-based chemical sensing
… we introduce approaches to carbon nanotube-based sensing for applications in environmental monitoring, disease diagnostics, and food analysis: In Chapter 1, we introduce carbon nanotube-based sensing. We describe parameters that give rise to the sensing capabilities of CNT-based sensors and …
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Chemical sensing applications of fiber optics
A sensing method that can monitor metallic structures continuously would eventually produce safer metallic structures as well as a more efficient and economic way to monitor corrosion. A secondary focus of this research is the implementation of a fiber optic sensor to measure refractive indices of …
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Improved swellable polymer microspheres for chemical sensing
<p>Derivatized lightly crosslinked polymer microspheres that swell and shrink as a function of pH have been investigated to develop polymeric transduction elements for fiber optic sensors and other sensors. The microspheres were immobilized in hydrogels forming a membrane. The membranes look turbid …
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Optofluidic microchip for biomedical and chemical sensing
… as optofluidics, for the creation of powerful chemical and biomedical diagnostic microchips. The design and fabri-cation of system components such as vertical-cavity surface-emitting lasers, pho-todetectors, and fluorescence filters are explored, and their integrations into a compact …
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Functionalization of CNFET arrays for chemical sensing
… and cost-effective approach for general gas sensing applications, including biomedical applications.
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Polymers for electronics and chemical sensing applications
… of functionality for emerging electronics and chemical sensing applications. In Chapter 1, we present a general introduction to organic electronic materials and chemical sensory technologies. This chapter introduces many of the important principles that are explored throughout the rest of the …
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Chemical Sensing of N-Nitrosodimethylamine and Methane
In Chapter 1, an introduction to chemical sensing is presented. Several modalities are introduced, including optical, gravimetric as well as chemiresistive together with brief in-troductory backgrounds. Subsequently, metrics to assess sensor performance are sum-marized. Finally, some strategies to …
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Wireless chemical sensing schemes using environmentally sensitive hydrogels
<p>In situ sensing of chemical parameters such as pH, glucose, enzymes, and other analytes is of immense importance in health care and environmental monitoring. There has been considerable research in this area using hydrogels as a chemo-mechanical transducer. Hydrogels are water-swollen polymers …
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Development of ZnO Nanotube Arrays for Chemical Sensing
… approach for early-stage cancer detection. Gas sensing technologies, particularly those based on low-cost semiconductor metal oxides (SMOX), offer feasible solutions to both these problems. Nevertheless, the application of SMOX sensors in these areas faces challenges due to inadequate …
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Mid-Infrared Integrated Devices for Optical Chemical Sensing
… is of special interest for establishing optical chemical sensor technologies by allowing specific molecular identification and quantification, whether the sample is in a liquid, gas or solid form, in addition to providing highly sensitive, rapid, reagent-free and non-destructive detection. This …
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Magnetic resonance imaging contrast agents for chemical sensing
… but other tools are needed to interrogate the chemical environment of these areas once found. The fast clearance rate of contrast agents, in particular, makes quantitative assessment of local tissue with MR difficult. This thesis focuses on the development of solid MRI contrast agents designed …
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Development of responsive materials for diffraction-based chemical sensing
… diffraction of visible light shows promise for sensing metal ions and other species that employ chemically-responsive metal oxide and conducting polymer grating elements. These materials undergo reversible redox processes upon interaction with a chemical analyte that subsequently induces changes …
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Applications of Oligopeptides and Liquid Crystals for Chemical Sensing
… sensor has potential to be developed as portable sensing devices or diagnostic kits in the future.
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Surface modification of silicon photonic microring resonators for chemical sensing
… changes in the effective refractive index of the sensing region, eliminating the need for chromophoric or fluorescently-tagged samples. This robust and versatile sensing platform has sensitivities down to 10-7 RIU and a linear dynamic range on the order of 1 RIU, eliciting interest in …
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Chemical Sensing as a Utility using Swept-Source Raman Spectroscopy
The integration of chemical sensing into everyday life is a decades-old dream that has so far failed to come to fruition. Many sensor technologies have been proposed and developed, but few can claim to be non-destructive, reagent-free, and suitable for multiple applications while also enabling …
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Nuclear magnetic resonance sensors and methods for chemical sensing in tissue
Rapid, sensitive, and minimally invasive sensing of metabolites, chemicals, and biological molecules within tissue is a largely unsolved problem. Sensing molecular oxygen, pH, and water content is of particular interest as they have been shown to be useful for improving disease diagnosis and …
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Highly Integrated Graphene-Based Chemical Sensing Platform for Structural Monitoring Applications
… materials, such as graphene, hold promise for sensing applications. Graphene's remarkable surface-to-volume ratio, when employed as a transducer, enables the sensor channel to be readily modulated in response to chemical changes in proximity to its surface, effectively converting chemical …
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