期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 341, 期 -, 页码 102-111出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2017.07.056
关键词
Gas sensor; Heterostructure; Zinc oxide; Graphitic carbon nitride; Synergistic effect
资金
- National Natural Science Foundation [51672220, 51502346]
- MOE [B08040]
- National Defense Science Foundation [32102060303]
- Xi'an Science and Technology Foundation
- Shaanxi Provincial Science Foundation
- NPU Gaofeng Project of China [17GH020824]
In this work, well-aligned ZnO nanorods were grown on the substrate of exfoliated g-C3N4 nanosheets via a microwave-assisted hydrothermal synthesis, and then Pt/ZnO/g-C3N4 nanostructures were obtained after the deposition of Pt nanoparticles. The growth of vertically ordered ZnO nanorods was occurred on g-C3N4 nanosheets through the bonding interaction between Zn and N atoms, which was confirmed by XPS, FT-IR data and molecular orbital theory. The Pt/ZnO/g-C3N4 nanostructures sensor exhibited the remarkable sensitivity, selectivity, and fast response/recovery time for air pollutants of ethanol and NO2. The application of Pt/ZnO/g-C3N4 nanostructures could be used as a dual-functional gas sensor through the controlled working temperature. Besides, the Pt/ZnO/g-C3N4 nanostructures sensor could be applied to the repeating detection of ethanol and NO2 in the natural environment. The synergistic effect and improved the separation of electron-hole pairs in Pt/ZnO/g-C3N4 nanostructures had been verified for the gas sensing mechanism. Additionally, Pt/ZnO/g-C3N4 nanostructures revealed the excellent charge carriers transport properties in electrochemical impedance spectroscopy (EIS), such as the longer electron lifetime (Tn), higher electron diffusion coefficient (On) and bigger effective diffusion length (4), which also played an important role for Pt/ZnO/g-C3N4 nanostructures with striking gas sensing activities. (C) 2017 Elsevier B.V. All rights reserved.
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