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 20 for “"Gas sensing applications"”.
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Metalloporphyrin-decorated semiconducting oxides for gas sensing applications
… released the first practical semiconductor gas sensor applied to the market, more and more researchers have invested in the research on the improvement and application of semiconductor gas sensors and a large number of modified tin oxide gas sensors with various gas sensing properties have …
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Heterogeneous integration of graphene and Si CMOS for gas sensing applications
Detecting presence of gas molecules is of prominent importance for controlling chemical processes, safety systems, and industrial and medical applications. Despite enormous progress in this field over past few decades on developing and improving various types of gas sensors, sensors with higher …
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Synthesis and characterisation of DLC and diamond films for gas sensing applications
… it to be a valuable material for several applications. Its band gap varies approximately between 1eV to 4 eV. This material has been extensively used in electronic, optical, mechanical and biomedical applications. In this research work diamond and DLC thin films are deposited on a silicon …
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Optical characterisation of quantum well infrared photodetectors (QWIPs) for gas sensing applications
Although much work has been done on λ∼5-12 μm quantum well infrared photodetectors (QvWPs), the distinctive feature of this project is the use of strain compensated materials on InP substrates, AIAs (tensile) and InGaAs (compressive), to achieve shorter wavelengths and higher temperature operation. …
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Palladium (pd) decorated zinc oxide (ZnO) nanoparticles for gas sensing applications: meat spoilage gases
… method for the purpose of testing their gas sensing properties. After the synthesis of these nanoparticles, various characterization techniques for the investigation of both physical and chemical properties were employed. Different percentages of Palladium ranging between 0.2% and 0.7% …
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Synthesis and characterization of tungsten oxide wo3 nanostructures thin films for gas sensing applications
… presents the synthesis of a room temperature gas sensor based on tungsten oxide (WO3) thin films. The synthesis of WO3 thin films was carried out using a direct current (DC) reactive magnetron sputtering at different deposition temperatures (300, 400 and 500 ºC). The deposition time, pressure, …
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Growth and characterization of FeSi nanowires by chemical vapor deposition for gas sensing applications
FeSi nanowires were synthesized via a chemical vapor deposition method. Anhydrous FeCl3 powder in this case served as the Fe source and was evaporated at a temperature of 1100oC to interact with silicon substrates which served as the silicon source. The nanowires followed the vapor solid (VS) …
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Functionalization of CNFET arrays for chemical sensing
Practical deployment of gas sensors for general-purpose applications requires integrated chips that operate at room temperature. However, real-world implementation has been limited by challenges such as the integration of highly sensitive and selective sensors, as well as insufficient statistical …
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Synthesis and Fabrication of Alpha Phase Iron Oxide (α-Fe2O3) Nanostructured doped with Ruthenium for Highly Sensitive and Selective Flammable and Toxic Gas Sensor
… causes the release of flammable and hazardous gases, which affect human health, into the atmosphere. Many research efforts have been focused on detecting and monitoring these gases using metal oxide semiconductor materials. This study investigates the gas sensing performance of ruthenium-doped …
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Functionalization and applications of carbon nanotubes
… properties and have been used in a variety of applications. In this thesis, we explore strategies to functionalize CNTs as well as applications which are enabled by functionalized CNTs. Chapter 1 gives an overview of emerging applications of CNTs. In Chapter 2, we describe a route that leads to …
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Non-silicon Microfabricated Nanostructured Chemical Sensors For Electric Nose Application
… for "Electric Nose", a system that can identify gas samples and detect their concentrations by combining sensor array and data processing technologies. Non-silicon based microfabricatition has been developed for micro-electro-mechanical-system (MEMS) based gas sensors. Novel sensors have been …
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Characterisation and simulation of InAs/InAsSb structures for mid-infrared LEDs
… high power and efficiency for room temperature gas sensing applications. InAs/InAsSb strained – layer superlattice (SLS) and multiple quantum well (MQW) structures of low antimony content (Sb = 3.7 – 13.5 %) grown by MBE on InAs substrates were compared. These structures were characterised by …
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Vertical silicon nanowire arrays for gas sensing
… characterize vertically aligned silicon nanowire gas sensors. Silicon nanowires are very attractive for gas sensing applications and vertically aligned silicon nanowires are preferred over horizontal nanowires for gas sensing due to the high density of nanowire arrays and the increased nanowire …
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Mid-Infrared Integrated Devices for Optical Chemical Sensing
… 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 thesis explores four different liquid- and gas- sensing applications and methods using MIR spectroscopy by integrating it with …
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Plasmonics Using High Quality Epitaxial Graphene: An Approach towards Next-Generation Optical Computing
… computing has been proposed for high performance applications owing to light's high frequency and noise tolerance. However, the diffraction limit of light prevents the shrinking of optical components to dimensions significantly smaller than the wavelength of light, typically µm's, compared to nm's …
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High throughput methods for synthesis and impedance characterisation of ABO3 gas sensing materials
… and characterisation of resistive thick-film gas sensors by use of high throughput impedance spectroscopy. Since the 1960s semiconducting resistive gas sensors are used in a wide range of applications. However, commercial systems show disadavantages which might be overcome by the use of new …
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Cross sensitivity analysis of optical fibre-based sensing for high pressure, high temperature measurement in oil and gas applications.
… environment are often desired in the oil and gas industry. Pressure and temperature are the most important parameters among them. Changes in pressure and temperature have a major role in many downhole processes and they have enabled the performance of producing wells, water-injection profiles, …
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Colorimetric sensor arrays for the detection of aqueous and gaseous analytes
… concerning the development of artificial sensing devices; most notably optoelectronic tongues and noses. Utilizing previous research on how the mammalian gustatory and olfactory systems operate, significant progress in mimicking these systems has been realized. The turning point in this …
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Development of Graphene Based Gas Sensors
… of graphene films vary with the desired applications. While reduced graphene flakes are needed for composite materials or conductive paints, planar graphene is needed for high performance electronic devices. The purpose of this research was to study the sensing behavior of graphene. …
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MEMS Piezoresistive Micro-Cantilever Arrays for Sensing Applications
… for sample collection and analysis. In all applications, one of the key-points for a successful solution of the problem is the availability of detectors with high-sensitivity and selectivity to the chemical or biochemical parameters of interest. Moreover, an increased diffused on-field …