Controllable Synthesis of Zn-Doped α-Fe<sub>2</sub>O<sub>3</sub> Nanowires for H<sub>2</sub>S Sensing
One-dimensional Zn-doped α-Fe<sub>2</sub>O<sub>3</sub> nanowires have been controllably synthesized by using the pure pyrite as the source of Fe element through a two-step synthesis route, including the preparation of Fe source solution by a leaching process and the...
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| Format: | Article |
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MDPI AG
2019-07-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/9/7/994 |
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| author | Kefeng Wei Sikai Zhao Wei Zhang Xiangxi Zhong Tingting Li Baoyu Cui Shuling Gao Dezhou Wei Yanbai Shen |
| author_facet | Kefeng Wei Sikai Zhao Wei Zhang Xiangxi Zhong Tingting Li Baoyu Cui Shuling Gao Dezhou Wei Yanbai Shen |
| author_sort | Kefeng Wei |
| collection | DOAJ |
| description | One-dimensional Zn-doped α-Fe<sub>2</sub>O<sub>3</sub> nanowires have been controllably synthesized by using the pure pyrite as the source of Fe element through a two-step synthesis route, including the preparation of Fe source solution by a leaching process and the thermal conversion of the precursor solution into α-Fe<sub>2</sub>O<sub>3</sub> nanowires by the hydrothermal and calcination process. The microstructure, morphology, and surface composition of the obtained products were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. It was found that the formation process of α-Fe<sub>2</sub>O<sub>3</sub> is significantly influenced by the introduction of Zn<sup>2+</sup>. The gas sensing measurements indicated that the sensor based on 1% Zn-doped α-Fe<sub>2</sub>O<sub>3</sub> nanowires showed excellent H<sub>2</sub>S sensing properties at the optimum operating temperature of 175 °C. Notably, the sensor showed a low H<sub>2</sub>S detection limit of 50 ppb with a sensor response of 1.5. Such high-performance sensing would be ascribed to the one-dimensional structure and high specific surface area of the prepared 1% Zn-doped α-Fe<sub>2</sub>O<sub>3</sub> nanowires, which can not only provide a large number of surface active sites for the adsorption and reaction of the oxygen and H<sub>2</sub>S molecules, but also facilitate the diffusion of the gas molecules towards the entire sensing materials. |
| first_indexed | 2024-12-21T13:30:29Z |
| format | Article |
| id | doaj.art-f5569668100d4037a3604688d2ff2a2b |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-12-21T13:30:29Z |
| publishDate | 2019-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-f5569668100d4037a3604688d2ff2a2b2022-12-21T19:02:20ZengMDPI AGNanomaterials2079-49912019-07-019799410.3390/nano9070994nano9070994Controllable Synthesis of Zn-Doped α-Fe<sub>2</sub>O<sub>3</sub> Nanowires for H<sub>2</sub>S SensingKefeng Wei0Sikai Zhao1Wei Zhang2Xiangxi Zhong3Tingting Li4Baoyu Cui5Shuling Gao6Dezhou Wei7Yanbai Shen8Shen Kan Engineering and Technology Corporation, MCC., Shenyang 110169, ChinaSchool of Resources and Civil Engineering, Northeastern University, Shenyang 110819, ChinaSchool of Resources and Civil Engineering, Northeastern University, Shenyang 110819, ChinaSchool of Resources and Civil Engineering, Northeastern University, Shenyang 110819, ChinaSchool of Resources and Civil Engineering, Northeastern University, Shenyang 110819, ChinaSchool of Resources and Civil Engineering, Northeastern University, Shenyang 110819, ChinaSchool of Resources and Civil Engineering, Northeastern University, Shenyang 110819, ChinaSchool of Resources and Civil Engineering, Northeastern University, Shenyang 110819, ChinaSchool of Resources and Civil Engineering, Northeastern University, Shenyang 110819, ChinaOne-dimensional Zn-doped α-Fe<sub>2</sub>O<sub>3</sub> nanowires have been controllably synthesized by using the pure pyrite as the source of Fe element through a two-step synthesis route, including the preparation of Fe source solution by a leaching process and the thermal conversion of the precursor solution into α-Fe<sub>2</sub>O<sub>3</sub> nanowires by the hydrothermal and calcination process. The microstructure, morphology, and surface composition of the obtained products were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. It was found that the formation process of α-Fe<sub>2</sub>O<sub>3</sub> is significantly influenced by the introduction of Zn<sup>2+</sup>. The gas sensing measurements indicated that the sensor based on 1% Zn-doped α-Fe<sub>2</sub>O<sub>3</sub> nanowires showed excellent H<sub>2</sub>S sensing properties at the optimum operating temperature of 175 °C. Notably, the sensor showed a low H<sub>2</sub>S detection limit of 50 ppb with a sensor response of 1.5. Such high-performance sensing would be ascribed to the one-dimensional structure and high specific surface area of the prepared 1% Zn-doped α-Fe<sub>2</sub>O<sub>3</sub> nanowires, which can not only provide a large number of surface active sites for the adsorption and reaction of the oxygen and H<sub>2</sub>S molecules, but also facilitate the diffusion of the gas molecules towards the entire sensing materials.https://www.mdpi.com/2079-4991/9/7/994α-Fe<sub>2</sub>O<sub>3</sub>Zn dopingnanowiresH<sub>2</sub>Sgas sensor |
| spellingShingle | Kefeng Wei Sikai Zhao Wei Zhang Xiangxi Zhong Tingting Li Baoyu Cui Shuling Gao Dezhou Wei Yanbai Shen Controllable Synthesis of Zn-Doped α-Fe<sub>2</sub>O<sub>3</sub> Nanowires for H<sub>2</sub>S Sensing Nanomaterials α-Fe<sub>2</sub>O<sub>3</sub> Zn doping nanowires H<sub>2</sub>S gas sensor |
| title | Controllable Synthesis of Zn-Doped α-Fe<sub>2</sub>O<sub>3</sub> Nanowires for H<sub>2</sub>S Sensing |
| title_full | Controllable Synthesis of Zn-Doped α-Fe<sub>2</sub>O<sub>3</sub> Nanowires for H<sub>2</sub>S Sensing |
| title_fullStr | Controllable Synthesis of Zn-Doped α-Fe<sub>2</sub>O<sub>3</sub> Nanowires for H<sub>2</sub>S Sensing |
| title_full_unstemmed | Controllable Synthesis of Zn-Doped α-Fe<sub>2</sub>O<sub>3</sub> Nanowires for H<sub>2</sub>S Sensing |
| title_short | Controllable Synthesis of Zn-Doped α-Fe<sub>2</sub>O<sub>3</sub> Nanowires for H<sub>2</sub>S Sensing |
| title_sort | controllable synthesis of zn doped α fe sub 2 sub o sub 3 sub nanowires for h sub 2 sub s sensing |
| topic | α-Fe<sub>2</sub>O<sub>3</sub> Zn doping nanowires H<sub>2</sub>S gas sensor |
| url | https://www.mdpi.com/2079-4991/9/7/994 |
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