Preparation and Gas-Sensitive Properties of SnO<sub>2</sub>@Bi<sub>2</sub>O<sub>3</sub> Core-Shell Heterojunction Structure
The SnO<sub>2</sub>@Bi<sub>2</sub>O<sub>3</sub> core-shell heterojunction structure was designed and synthesized via a hydrothermal method, and the structure and morphology of the synthesized samples were characterized using X-ray diffraction (XRD), scanning elect...
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| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-01-01
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| Series: | Nanomaterials |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2079-4991/15/2/129 |
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| Summary: | The SnO<sub>2</sub>@Bi<sub>2</sub>O<sub>3</sub> core-shell heterojunction structure was designed and synthesized via a hydrothermal method, and the structure and morphology of the synthesized samples were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). Based on the conclusions from XRD and SEM, it can be observed that as the hydrothermal temperature increases, the content of Bi<sub>2</sub>O<sub>3</sub> coated on the surface of SnO<sub>2</sub> spheres gradually increases, and the diameter of Bi<sub>2</sub>O<sub>3</sub> nanoparticles also increases. At a hydrothermal temperature of 160 °C, the SnO<sub>2</sub> spheres are fully coated with Bi<sub>2</sub>O<sub>3</sub> nanoparticles. This paper investigated the gas-sensitive performance of the SnO<sub>2</sub>@Bi<sub>2</sub>O<sub>3</sub> sensor towards ethanol gas. Gas sensitivity tests at the optimal operating temperature of 300 °C showed that the composite prepared at 160 °C achieved a response value of 19.7 for 100 ppm ethanol. Additionally, the composite exhibited excellent response to 100 ppm ethanol, with a response time of only 4 s, as well as good repeatability. The excellent gas-sensitive performance of the SnO<sub>2</sub>@Bi<sub>2</sub>O<sub>3</sub> core-shell heterojunction towards ethanol gas is attributed to its p-n heterojunction material properties. Its successful preparation contributes to the realization of high-performance heterostructure ethanol gas sensors. |
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| ISSN: | 2079-4991 |