Copper Oxide Single-Nanowire-Based Devices and Applications
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Date
2022
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Abstract
Transition-metal-oxide semiconductors, including composites in nano-form, are
explored widely for photodetectors and volatile organic compound (VOC) sensors in
two-terminal and field-effect-transistor (FET) configurations. Photodetectors are
generally used in optical detectors, communication, and thermal imaging systems. On
the other hand, VOC biosensors have facilitated the early detection, diagnosis, and
treatment of diseases and disorders in recent days.
Thesis reports the fabrication of the copper oxide (CuO) single nanowire (SNW)
devices for photodetection and volatile organic compounds (VOCs) detection. The first
contribution is to fabricate a CuO SNW photodetector. The electrodes are realized using
silver nanoparticles (AgNP) microcantilever contact print (uCCP) using spot overwrite
and drag techniques. The photodetector exhibits exceptional performance and
reliability. The second contribution includes designing the controlled environment
chamber (CEC) to measure sensor response for gases and VOCs. The VOC CEC
sensing setup facilitates the validation of the point-of-care devices. The third
contribution is developing CuO SNW devices of various lengths to sense VOCs such as
ethanol, acetone, 2-propanol, etc., at room temperature, 150 degrees C, and under
white light. The device response to ethanol at different conditions showed good stability.
The fourth contribution is fabricating CuO SNW Field Effect Transistors (FETs) with the
bottom gate, coplanar gate, and top gate architectures. The fifth contribution
includes the fabrication of fully solution-processed planar capacitors and FET
Description
Supervisor: Roy P Paily
Keywords
ELECTRONICS AND ELECTRICAL ENGINEERING