Size effects of tin oxide quantum dot gas sensors: from partial depletion to volume depletion
| Autor: | Qianru Zhang, Jianqiao Liu, Jingcheng Shi, Ce Fu, Liting Wu, Jiarong Lv, Ningning Su |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Tin oxide quantum dot
lcsh:TN1-997 Materials science 02 engineering and technology Electron 01 natural sciences Biomaterials Depletion region Electrical resistivity and conductivity 0103 physical sciences Size effect lcsh:Mining engineering. Metallurgy 010302 applied physics business.industry Metals and Alloys Volume depletion 021001 nanoscience & nanotechnology Tin oxide Grain size Surfaces Coatings and Films Semiconductor Quantum dot Chemical physics Ceramics and Composites Crystallite 0210 nano-technology business Gas sensor Receptor function |
| Zdroj: | Journal of Materials Research and Technology, Vol 9, Iss 6, Pp 16399-16409 (2020) |
| ISSN: | 2238-7854 |
| Popis: | The grain size effect is one of the fundamental characteristics of semiconductor gas sensors. However, it has not been fully understood due to the absence of studies on the volume-depleted grains. In this work, the gas-sensitive SnO2 quantum dots (QDs) from partial depletion to volume depletion are prepared to discuss the size effects. A facile aqueous-based method is used to prepare the size-controllable SnO2 QDs of 2.0–12.6 nm. The resistance shows a monotonically negative size effect while the response reaches the optimization when the grain radius is comparable to the depletion layer width. It is suggested that the design of highly sensitive gas sensors should consider the equal importance of the control of grain size and depletion layer width. The computational results illustrate size-dependent energy level of donors and number of quasi-free electrons, which are responsible for the negative size effect of resistivity in the volume-depleted SnO2 crystallites. This work provides a comprehensive understanding of grain size effects from partial depletion to volume depletion in semiconductor gas sensors. |
| Databáze: | OpenAIRE |
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