Investigation on TiO2/graphene Schottky junction for volatile organic compound gases

Nor Azmi, Muhammad Haziq (2024) Investigation on TiO2/graphene Schottky junction for volatile organic compound gases. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

A Schottky junction gas sensor is a junction formed between a metal and a semiconductor that forms a barrier, which can be modified by the presence of gas molecules. When gas molecules encounter the Schottky junction, they can change the properties of the semiconductor, such as its surface potential and charge carrier concentration. This, in turn, affects the electrical characteristics of the Schottky junction, such as its barrier height and capacitance. Due to the limitation of ohmic junction that has no diffusion barrier, external voltage can cause current to flow regardless of its polarity. To overcome this, Schottky junction is proposed in this project due to the formation of potential barrier at the interface. The goal of this project is to investigate the structure of Schottky junction gas sensor using Titanium dioxide/graphene (TiO2/graphene) as sensing material for detecting volatile organic compound gases. This Schottky junction will be formed by attaching TiO2/graphene with silver that will be deposited using screen printing on a Kapton film substrate. Design 3 has higher response to acetone gas with the average value of 1.0255 compared to design 1 and 2 which has the average value of 1.0117 and 1.0222 respectively while design 2 has higher response to ethanol gas with the average value of 1.0586 compared to design 1 and 3 which has 1.0577 and 1.0339 respectively.

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