Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7834925 | Applied Surface Science | 2018 | 43 Pages |
Abstract
In the present study, crystal-facet-dependent gas sensing performance was thoroughly investigated and sensing mechanism of TiO2 was elaborated in depth. Anatase TiO2 nano-polyhedron with highly reactive (0 0 1) facet was successfully synthesized via a one-pot hydrothermal method using fluoride as facet stabilizer and was utilized for fabrication of carbon monoxide gas sensors, followed by characterization of microstructure, phase-purity and gas-sensing properties. Chemiresistive properties of (0 0 1)-dominated gas sensor exhibit superior response to CO with a maximum response of 27.9 at 300â¯ppm in optimum working temperature as 350â¯Â°C. Particularly, first-principle calculation was carried out to expound the sensing mechanism, which shows that CO adsorption on (0 0 1) facet is more stable and favorable than that on normally exposed (1 0 1) facet, corroborating the reactive nature of (0 0 1) facet.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Yuxuan Zhang, Wen Zeng, Hong Ye, Yanqiong Li,