Journal
APPLIED SURFACE SCIENCE
Volume 535, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2020.147666
Keywords
TiO2-C/g-C3N4 composite; Gas sensing; Ti3C2Tx MXene derivation; UV-light irradiation; Volatile organic compounds
Categories
Funding
- National Natural Science Foundation of China [51864028]
- Yunnan Province Science and Technology Major Project for Materials Genetic Engineering of Rare and Precious Metal [202002AB080001]
- Applied Basic Research Fund Project of Yunnan Province [2018FD053, 2018FA029]
- Yunnan Province Funds for Distinguished Young Scientists [2019FJ005]
- Yunnan Province Foreign Experts Introduction Project Plan [YN2020010]
- Yunnan Ten Thousand Talents Plan Young & Elite Talents Project [YNWRQNBJ-2018-311]
- China Scholarship Council [201808740007, 201908530039]
- Yunnan Ten Thousand Talents Plan of Study Abroad Project [201808740007, 201908530039]
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In this study, two-dimensional layered-structured Ti3C2Tx MXene and TiO2-C/g-C3N4 (TC-CN) composites were prepared and investigated for their gas sensing performances towards volatile organic compounds gases under UV light. The results showed that TC-CN exhibited excellent response values towards gases such as ethanol under UV light irradiation.
Two-dimensional layered-structured Ti3C2Tx MXene was prepared with hydrochloric acid and LiF. TiO2-C/g-C3N4 (TC-CN) composites were prepared by in situ growth method using melamine and Ti3C2Tx as a precursor. The structural properties of the as-prepared samples were characterized using SEM, XRD, and FT-IR measurements. The SEM image of TC-CN shows that it possesses an MXene-like lamellar structure. The gas sensing performances of TC-CN toward different volatile organic compounds gases at room temperature under UV light irradiation were investigated. The gas sensing results revealed that TC-CN showed excellent response value for 91 to 10 ppm ethanol at room temperature under UV light irradiation. The excellent gas sensing performances can be attributed to the UV light irradiation, construction of energy level dislocation, and lamellar structure of the composites, which leads to the enhancement of photoelectrons, reduction of the recombination of photoelectrons and holes, and high transportation of electrons in the TC-CN heterojunction, consequently enhancing the combination of the electrons and oxygen. Further, the possible gas sensing mechanism of the material was proposed and discussed.
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