期刊
SENSORS
卷 18, 期 10, 页码 -出版社
MDPI
DOI: 10.3390/s18103334
关键词
wearable gas sensor; graphene oxide; titanium dioxide; graphene-metal oxide composite; photocatalysis; photoreduction
资金
- Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Korea Government Ministry of Trade, Industry and Energy [20158520000210]
- Agency for Defense Development (ADD) [UD160050BD]
Few studies have investigated the gas-sensing properties of graphene oxide/titanium dioxide (GO/TiO2) composite combined with photocatalytic effect. Room temperature gas-sensing properties of the GO/TiO2 composite were investigated towards various reducing gases. The composite sensor showed an enhanced gas response and a faster recovery time than a pure GO sensor due to the synergistic effect of the hybridization, such as creation of a hetero-junction at the interface and modulation of charge carrier density. However, the issue of long-term stability at room temperature still remains unsolved even after construction of a composite structure. To address this issue, the surface and hetero-junction of the GO/TiO2 composite were engineered via a UV process. A photocatalytic effect of TiO2 induced the reduction of the GO phase in the composite solution. The comparison of gas-sensing properties before and after the UV process clearly showed the transition from n-type to p-type gas-sensing behavior toward reducing gases. This transition revealed that the dominant sensing material is GO, and TiO2 enhanced the gas reaction by providing more reactive sites. With a UV-treated composite sensor, the function of identifying target gas was maintained over a one-month period, showing strong resistance to humidity.
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