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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2025-01-01
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| author | Jin Liu Yixin Gao Yuanyuan Lv Mengdi Yang Haoru Guo Neng Li Danyang Bai Anyi Wang |
| author_facet | Jin Liu Yixin Gao Yuanyuan Lv Mengdi Yang Haoru Guo Neng Li Danyang Bai Anyi Wang |
| author_sort | Jin Liu |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-693e4b8204e0492c8f2e61bf7345725a |
| institution | Kabale University |
| issn | 2079-4991 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
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| series | Nanomaterials |
| spelling | doaj-art-693e4b8204e0492c8f2e61bf7345725a2025-01-24T13:44:14ZengMDPI AGNanomaterials2079-49912025-01-0115212910.3390/nano15020129Preparation and Gas-Sensitive Properties of SnO<sub>2</sub>@Bi<sub>2</sub>O<sub>3</sub> Core-Shell Heterojunction StructureJin Liu0Yixin Gao1Yuanyuan Lv2Mengdi Yang3Haoru Guo4Neng Li5Danyang Bai6Anyi Wang7School of Communication and Information Engineering, Xi’an University of Science and Technology, Xi’an 710054, ChinaSchool of Communication and Information Engineering, Xi’an University of Science and Technology, Xi’an 710054, ChinaSchool of Communication and Information Engineering, Xi’an University of Science and Technology, Xi’an 710054, ChinaSchool of Communication and Information Engineering, Xi’an University of Science and Technology, Xi’an 710054, ChinaSchool of Communication and Information Engineering, Xi’an University of Science and Technology, Xi’an 710054, ChinaSchool of Communication and Information Engineering, Xi’an University of Science and Technology, Xi’an 710054, ChinaSchool of Communication and Information Engineering, Xi’an University of Science and Technology, Xi’an 710054, ChinaSchool of Communication and Information Engineering, Xi’an University of Science and Technology, Xi’an 710054, ChinaThe 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.https://www.mdpi.com/2079-4991/15/2/129SnO<sub>2</sub>@Bi<sub>2</sub>O<sub>3</sub> heterojunctionshydrothermal methodgas sensorsethanol |
| spellingShingle | Jin Liu Yixin Gao Yuanyuan Lv Mengdi Yang Haoru Guo Neng Li Danyang Bai Anyi Wang Preparation and Gas-Sensitive Properties of SnO<sub>2</sub>@Bi<sub>2</sub>O<sub>3</sub> Core-Shell Heterojunction Structure Nanomaterials SnO<sub>2</sub>@Bi<sub>2</sub>O<sub>3</sub> heterojunctions hydrothermal method gas sensors ethanol |
| title | Preparation and Gas-Sensitive Properties of SnO<sub>2</sub>@Bi<sub>2</sub>O<sub>3</sub> Core-Shell Heterojunction Structure |
| title_full | Preparation and Gas-Sensitive Properties of SnO<sub>2</sub>@Bi<sub>2</sub>O<sub>3</sub> Core-Shell Heterojunction Structure |
| title_fullStr | Preparation and Gas-Sensitive Properties of SnO<sub>2</sub>@Bi<sub>2</sub>O<sub>3</sub> Core-Shell Heterojunction Structure |
| title_full_unstemmed | Preparation and Gas-Sensitive Properties of SnO<sub>2</sub>@Bi<sub>2</sub>O<sub>3</sub> Core-Shell Heterojunction Structure |
| title_short | Preparation and Gas-Sensitive Properties of SnO<sub>2</sub>@Bi<sub>2</sub>O<sub>3</sub> Core-Shell Heterojunction Structure |
| title_sort | preparation and gas sensitive properties of sno sub 2 sub bi sub 2 sub o sub 3 sub core shell heterojunction structure |
| topic | SnO<sub>2</sub>@Bi<sub>2</sub>O<sub>3</sub> heterojunctions hydrothermal method gas sensors ethanol |
| url | https://www.mdpi.com/2079-4991/15/2/129 |
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