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49,80 €ISBN 978-3-8440-8460-3Softcover154 pages88 figures228 g24 x 17 cmEnglishThesis
February 2022
Bora Ersöz
Electrolyte-Gated Transistor for Carbon Dioxide Sensing
The aim of the present thesis is the development of a novel CO2 sensor, which is able to meet the main requirements for implementation in battery-powered electronic devices: high accuracy, fast response, negligible production costs, smallfootprint packaging, and low power consumption.
In order to meet these requirements, the feasibility of an “electrolyte-gated transistor (EGT)” as CO2 sensor was investigated. The novel EGT-based sensor concept exploits synergies of various sensing techniques:
The investigated EGT approach comprises a n-type semiconducting metal oxide (MOX) as channel and an ionic liquid (IL) as electrolyte. Such an approach for CO2 detection has not been described in literature yet. Therefore, the focus of the present thesis was to elucidate the underlying sensing mechanism. In this respect, experimental data as well as simulations were taken into account.
In order to meet these requirements, the feasibility of an “electrolyte-gated transistor (EGT)” as CO2 sensor was investigated. The novel EGT-based sensor concept exploits synergies of various sensing techniques:
- the sensitivity of field-effect transistors (FET),
- the selectivity and modest power demand of electrochemical sensors
- and the ease of integration and operation of chemiresistors.
The investigated EGT approach comprises a n-type semiconducting metal oxide (MOX) as channel and an ionic liquid (IL) as electrolyte. Such an approach for CO2 detection has not been described in literature yet. Therefore, the focus of the present thesis was to elucidate the underlying sensing mechanism. In this respect, experimental data as well as simulations were taken into account.
Keywords: gas sensing; impedance spectroscopy; transistor; carbon dioxide; electrochemistry
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