Nanostructure Bi2WO6: Surfactant-assisted hydrothermal synthesis for high sensitive and selective sensing of H2S
| Autor: | Zhidong Lin, Mingkun Wu, Fangjie Ji, Huanli Dong, Yang Qu, Hao Chen, Wencheng Liu, Hao Li |
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| Rok vydání: | 2019 |
| Předmět: |
Nanostructure
Materials science Metals and Alloys 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Hydrothermal circulation Grain size 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention Nanocrystal Chemical engineering Pulmonary surfactant law Materials Chemistry Hydrothermal synthesis Orthorhombic crystal system Electrical and Electronic Engineering 0210 nano-technology Electron paramagnetic resonance Instrumentation |
| Zdroj: | Sensors and Actuators B: Chemical. 294:224-230 |
| ISSN: | 0925-4005 |
| DOI: | 10.1016/j.snb.2019.05.042 |
| Popis: | Multilayer Bi 2WO6 micro-nano hierarchical structures were prepared via a facile hydrothermal method using sucrose as template in the presence of four kinds of surfactants. The morphologies and phases were determined by SEM, TEM and XRD. All the hierarchical structures Bi 2WO6 are composed of nanocrystals with orthorhombic lattice. The grain size, specific surface areas and pore size vary with the surfactant. And the influence of different surfactants on oxygen vacancy (OV) was investigated by electron paramagnetic resonance (EPR), the sample prepared by F127 has a certain OV concentration and show the highest sensitivity. As gas sensing material, all the hierarchical structures Bi 2WO6 show high selectivity and fast response-recovery characteristic to the H2S at 260 °C. Meanwhile, the sensors presented a favorable linear relationship with the H2S concentration (1∼660 ppm). The sensors based on BWO-F127 exhibit the highest sensitivity to H2S, due to the existed O vacancies, the high specific surface areas and large pore volumes, which can provide potential applications for detecting H2S. |
| Databáze: | OpenAIRE |
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