Improvement of Ethanol Gas-Sensing Responses of ZnO–WO<sub>3</sub> Composite Nanorods through Annealing Induced Local Phase Transformation
In this study, ZnO−WO<sub>3</sub> composite nanorods were synthesized through a combination of hydrothermal growth and sputtering method. The structural analysis results revealed that the as-synthesized composite nanorods had a homogeneous coverage of WO<sub>3</sub>...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2019-04-01
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| Series: | Nanomaterials |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2079-4991/9/5/669 |
| Summary: | In this study, ZnO−WO<sub>3</sub> composite nanorods were synthesized through a combination of hydrothermal growth and sputtering method. The structural analysis results revealed that the as-synthesized composite nanorods had a homogeneous coverage of WO<sub>3</sub> crystallite layer. Moreover, the ZnO−WO<sub>3</sub> composite nanorods were in a good crystallinity. Further post-annealed the composite nanorods in a hydrogen-containing atmosphere at 400 °C induced the local phase transformation between the ZnO and WO<sub>3</sub>. The ZnO−WO<sub>3</sub> composite nanorods after annealing engendered the coexistence of ZnWO<sub>4</sub> and WO<sub>3</sub> phase in the shell layer which increased the potential barrier number at the interfacial contact region with ZnO. This further enhanced the ethanol gas-sensing response of the pristine ZnO−WO<sub>3</sub> composite nanorods. The experimental results herein demonstrated a proper thermal annealing procedure of the binary composite nanorods is a promising approach to modulate the gas-sensing behavior the binary oxide composite nanorods. |
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| ISSN: | 2079-4991 |