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 45 for “"Chemical sensor"”.
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Biopsy-implantable chemical sensor
… and the right dose. This thesis presents a sensor that can be implanted inside the body during a biopsy procedure and wirelessly report on the tissue environment. The sensor has direct access and can track metabolic markers, such as pH and oxygen, which have been shown to predict outcome, …
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A deep sea lab on a chip chemical sensor
The measurement of chemical concentrations within the oceans is crucial for our understanding of its biogeochemical processes. Such data is vital for; studies of climate and environment change; natural resource management; assessment of pollution, human impact and biodiversity. Current measurement …
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Electronic Properties of Tailored 2D Materials for Chemical Sensor Applications
Chemical sensor devices made of nanoscale materials have been widely used in different technological applications, and their susceptibility to perturbations in the environment depends on the host material properties. The latter can detect a concentration of impurities and evidence such changes in …
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Design and implementation of a real-time, chemical sensor network
Current methods of environmental chemical data collection are limited in both time and space. This limited set of data inhibits researchers from fully understanding the chemical processes occurring in water bodies. In order to gain further insight, it is necessary to develop a new method of data …
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Synthesis and surface chemistry of zinc oxide nanowires for chemical sensor applications
… sensitive and selective p-nitrophenol vapor sensor. High-quality ZnO nanowires were synthesized through a vapor-liquid-solid process in a customized chemical vapor deposition furnace. Scanning electron microscopy, transmission electron microscopy, x-ray diffraction, and energy dispersive …
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Design and development of a network architecture for a chemical sensor network
A real-time continuous chemical sensor network can obtain detailed data to analyze the dynamic behavior of water systems such as a lake. The behaviors of interest to us in Upper Mystic Lake are the effects of stratification on methane water chemistry and the results of water mixing between layers. …
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Mixed-Signal IC design for Heterogeneously Integrated Multi-Analyte Chemical Sensor Arrays
Wireless sensor nodes are emerging in a wide range of critical applications such as environmental monitoring, health applications, home automation and military surveillance and reconnaissance. The addition of low power wireless capability to such sensor nodes allows communication between a node and …
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The use of a microchannel plate in the development of a chemical sensor
The use of a microchannel plate as an optical encoding device has many advantages. These include large surface area and large-scale signal averaging. This instrument was designed to obtain and interpret the information generated by the optical transform of a microchannel plate. It will be shown …
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A chemical sensor based on surface plasmon resonance on surface modified optical fibers
A sensor is described which utilizes the phenomenon of surface plasmon resonance to detect changes in refractive index of chemical or biochemical samples applied to a surface modified optical fiber. The sensor is constructed by polishing a short section of the lateral surface of an optical fiber to …
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Layer-by-layer carbon nanotube electrodes for flexible chemical sensor and energy storage applications
… electrodes were utilized for applications in chemical sensing and energy storage as described below. First, the LbL-MWNT/electrospun fiber electrodes were employed as flexible chemiresistive sensors for real-time detection of a nerve agent simulant (dimethyl methylphosphonate (DMMP)). …
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Evaluation of a planar optic waveguide as a platform for evanescent field chemical sensor development
… sensitivity of the device for evanescent field chemical sensor development in the visible spectral region. However, it was discovered that selective prism and grating coupling to discrete waveguide modes was not possible due to strong crosstalk between modes in multiple mode Ag$\sp+$-exchange …
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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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Application of Machine Learning Techniques for Real-time Classification of Sensor Array Data
… need to identify approaches for classifying chemical sensor array data with high success rates that would enhance sensor detection capabilities. The present study attempts to fill this need by investigating six machine learning methods to classify a dataset collected using a chemical sensor …
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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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Semiconductor nanostructures for device applications
… reliable and reproducible 4-nitrophenol (4-NP) chemical sensor based on CuO nanocubes. The structural characterizations confirmed the nanocrystalline nature and monoclinic structure for as-synthesized nanocubes. The optical property of CuO nanocubes exhibits indirect and direct band gap values …
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An energy efficient CMOS interface to carbon nanotube sensor arrays
… considered as a candidate for a next-generation chemical sensor. CNT sensors are attractive as they allow room-temperature sensing of chemicals. From the system perspective, this signifies that the sensor system does not require any micro hotplates, which are one of the major sources of power …
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Calibration, feature extraction and classification of water contaminants using a differential mobility spectrometer
… Waveform Ion Mobility Spectrometry (FAIMS) is a chemical sensor that separates ions in the gaseous phase based on their mobility in high electric fields. A threefold approach was developed for both chemical type classification and concentration classification of water contaminants for FAIMS …
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MEMS-based resonant sensor arrays : selective detection of volatile and toxic chemicals
… there is a strong need today for robust chemical sensing systems that are portable in addition to being highly sensitive. While there are many options available for gaseous chemical detection and identification, not all are well-suited toward the creation of a portable device. Boston …
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CHARACTERIZATION OF LONG PATHLENGTH CAPILLARY WAVEGUIDES FOR EVANESCENT FLUORESCENCE APPLICATIONS
… ability of the FOCap to function as an indirect chemical sensor for nitroaromatic compounds is demonstrated with a pyrene-labeled waveguide.
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