ZnO/Zn2SnO4 nanorod heterostructure coatings for effective detection of acetone
Type II ZnO/Zn2SnO4 heterostructure was considered for gas sensor applications. ZnO nanorods surrounded by a Zn2SnO4 shell were grown on the surface of BI2 substrate with sputtered electrical contacts (sensor plat-form) by the hydrothermal synthesis method. Gas-sensitive properties were investigated...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | Russian |
| Published: |
Tver State University
2024-12-01
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| Series: | Физико-химические аспекты изучения кластеров, наноструктур и наноматериалов |
| Subjects: | |
| Online Access: | https://physchemaspects.ru/2024/doi-10-26456-pcascnn-2024-16-794/?lang=en |
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| Summary: | Type II ZnO/Zn2SnO4 heterostructure was considered for gas sensor applications. ZnO nanorods surrounded by a Zn2SnO4 shell were grown on the surface of BI2 substrate with sputtered electrical contacts (sensor plat-form) by the hydrothermal synthesis method. Gas-sensitive properties were investigated on different gas analytes (isopropanol, ethanol, and acetone) using a combined laboratory setup allowing for resistivity response and electrical impedance spectroscopy measurements. At an operating temperature of 150°C, the sample showed optimum sensitivity to acetone (1000 ppm) and the Ra/Rg ratio reached a value of 11. The variation of the impedance plot based on the results of measurements in the presence of acetone vapors at an operating temperature of 200°C shows consistent changes. This operating temperature showed a clearer optimization compared to other studies where the sensor operating temperature ranged from 300 to 450°C. In addition, the energy band diagram of the ZnO/Zn2SnO4 heterostructure was presented and the acetone detection mechanism was discussed. The structure of the ZnO/Zn2SnO4 nanorods causes an improved response due to the chemisorption of oxygen on the surface of the Zn2SnO4 shells. |
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| ISSN: | 2226-4442 2658-4360 |