Laser-generated BiVO4 colloidal particles with tailoring size and native oxygen defect for highly efficient gas sensing
| Autor: | Hongqiang Wang, Xiaokang Qiao, Youxun Xu, Lichao Jia, Can Li, Kai Yang |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Environmental Engineering
Fabrication Chemical substance Materials science Health Toxicology and Mutagenesis 0211 other engineering and technologies chemistry.chemical_element 02 engineering and technology 010501 environmental sciences 01 natural sciences Oxygen law.invention chemistry.chemical_compound law Environmental Chemistry Irradiation Absorption (electromagnetic radiation) Waste Management and Disposal 0105 earth and related environmental sciences 021110 strategic defence & security studies business.industry Laser Pollution chemistry Bismuth vanadate Optoelectronics business Science technology and society |
| Zdroj: | Journal of Hazardous Materials. 392:122471 |
| ISSN: | 0304-3894 |
| DOI: | 10.1016/j.jhazmat.2020.122471 |
| Popis: | To alleviate the poor sensing performance of BiVO4, developing new strategies for the fabrication of unique device with improved sensing properties is very necessary and has great practical significance. In this work, size-tailored and uniform black BiVO4 colloids with abundant oxygen vacancy were synthesized by a unique method of pulsed laser irradiation of colloidal nanoparticles (PLICN). The corresponding laser irradiation effects on the sensing properties are comparatively investigated. The results indicate that the BiVO4 nanospheres with average size of 50 nm shows best sensing properties with high sensitivity, superior selectivity, low detection limit (44 ppb) to H2S at low working temperature (75 °C). Its sensing response is over 4 times higher when comparing with that of the raw material. Further investigation manifests that laser irradiation could induce quantity of the oxygen vacancy and decrease the resistance of the sensing device, which is mainly responsible for the enhanced sensing performance. Moreover, the density functional theories (DFT) calculations suggest that the oxygen vacancies can greatly decrease the surface absorption energy with enhanced H2S absorption capability on BiVO4 surface and lower the bader charger transfer from the absorbed H2S molecules to the BiVO4, thus enabling the implementation for the enhanced gas-sensing properties. |
| Databáze: | OpenAIRE |
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