Enhanced Gas-Sensing Performance of GO/TiO2 Composite by Photocatalysis
- Authors
- Lee, Eunji; Lee, Doohee; Yoon, Jaesik; Yin, Yilin; Lee, You Na; Uprety, Sunil; Yoon, Young Soo; Kim, Dong-Joo
- Issue Date
- Oct-2018
- Publisher
- MDPI
- Keywords
- wearable gas sensor; graphene oxide; titanium dioxide; graphene-metal oxide composite; photocatalysis; photoreduction
- Citation
- SENSORS, v.18, no.10
- Journal Title
- SENSORS
- Volume
- 18
- Number
- 10
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/3268
- DOI
- 10.3390/s18103334
- ISSN
- 1424-8220
- Abstract
- 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.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - 공과대학 > 신소재공학과 > 1. Journal Articles
![qrcode](https://api.qrserver.com/v1/create-qr-code/?size=55x55&data=https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/3268)
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.