期刊
CHEMICAL ENGINEERING JOURNAL
卷 375, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.121924
关键词
Colloidal template; Ordered porous film; Bismuth vanadate; Gas sensor; Hydrogen sulfide
资金
- Fundamental Research Funds for the Central Universities [GK201702007, G2017KY0002]
- National Natural Science Foundation of China [51872179, 11811530635, 51872240, 51672225]
- Natural Science Foundation of Shaanxi Province [2017JM5028]
- 1000 Youth Talent Program of China
Seeking for novel materials that show pronounced gas sensing performance has been of great interests from both academic and technological perspectives. Herein, we report for the first time the gas sensing properties of monoclinic phase BiVO4 porous films with high selectivity and low detection limit towards H2S. The porous film with honeycomb-like morphology was in situ synthesized based on the solution dipping strategy using monolayer colloidal crystal as template. The BiVO4 porous film based sensor exhibits excellent sensing performance with high selectivity of 15.9 and the response time as fast as 5 s toward 25 ppm H2S gas at low working temperature (75 degrees C). The sensing detection limit can reach as low as 62.5 ppb. Moreover, the general feature of the colloidal crystal template approach allows for the accessing of porous BiVO4 films based gas sensors with tunable sensing performance. Based on a five-axe spider-web diagram which could evaluate the optimal practical work condition including sensitivity, selectivity, operating temperature and response/recovery rate, the porous film with 200 nm pore size demonstrates the best potential to keep the good balance of sensing performance. These results suggest that BiVO4, which is a well-known photocatalyst, can be potentially used in high performance gas sensing.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据