| Autor: |
Zhen, Yuhua, Qie, Yuanyue, Jiang, Xiaolin, Yang, Wenjie, Qin, Zheng, Feng, Yao, Yang, Zhengren, Xue, Qingzhong |
| Zdroj: |
Crystal Growth & Design; 20230101, Issue: Preprints |
| Abstrakt: |
In this work, a WSe2/SnO2heterostructure is prepared by hydrothermal synthesis. The attachment of SnO2to flower-like WSe2nanosheets can generate gas transmission and n–n heterojunction, resulting in improved sensitivity and decreased response/recovery time. The response of the WSe2/SnO2sensor toward NH3(183) is higher than those of pure WSe2(15.6) and SnO2(41.5). Under ultraviolet-light (UV-light) irradiation, the sensitivity of the WSe2/SnO2composite is further improved and its low detection limit is significantly reduced. The sensitivity of WSe2/SnO2exposed to 1 ppm of NH3is increased by 200%, and its low detection limit concentration is 50 ppb (1.18). In addition, the adsorption mechanism of NH3is explained by density functional theory (DFT) calculation. The formation of the heterojunction was demonstrated by analyzing the X-ray photoelectron spectroscopy (XPS) spectra. The results show that the UV-activated WSe2/SnO2heterostructure can detect NH3sensitively at room temperature. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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