Hierarchical Heterojunctions of Metal Sulfide WS 2 Nanosheets/Metal Oxide In 2 O 3 Nanofibers for an Efficient Detection of Formaldehyde.
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| Title: | Hierarchical Heterojunctions of Metal Sulfide WS 2 Nanosheets/Metal Oxide In 2 O 3 Nanofibers for an Efficient Detection of Formaldehyde. |
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| Authors: | Zhu, Lei1,2 (AUTHOR) leizhu@xjtu.edu.cn, Zhang, Jiaxin1 (AUTHOR), Wang, Jianan1 (AUTHOR) wangjn116@xjtu.edu.cn, Liu, Jianwei1,3 (AUTHOR), Yan, Wei1 (AUTHOR) wangjn116@xjtu.edu.cn |
| Source: | Nanomaterials (2079-4991). Nov2024, Vol. 14 Issue 21, p1702. 12p. |
| Subjects: | P-N heterojunctions, Gas detectors, Gas absorption & adsorption, Charge transfer, Nanostructured materials |
| Abstract: | The construction of transition metal dichalcogenides (TMDs) heterojunctions for high-performance gas sensors has garnered significant attention due to their capacity to operate at low temperatures. Herein, we realize two-dimensional (2D) WS2 nanosheets in situ grown on one-dimensional (1D) In2O3 nanofibers to form heterostructures for formaldehyde (HCHO) gas sensors. Capitalizing on the p-n heterojunctions formed between WS2 and In2O3, coupled with the high surface-to-volume ratio characteristic of 1D nanostructures, the WS2/In2O3 NFs sensor demonstrated an elevated gas response of 12.6 toward 100 ppm HCHO at 140 °C, surpassing the performance of the pristine In2O3 sensor by a factor of two. Meanwhile, the sensor presents remarkable repeatability, rapid response/recovery speed, and good long-term stability. The superior sensing capabilities of WS2/In2O3 NFs heterojunction are attributed to the combined impact of the increased charge transfer and the presence of more sites for gas adsorption. The research endows a potent approach for fabricating TMD heterojunctions to significantly enhance the gas sensing properties of gas sensors at relatively low temperatures. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | The construction of transition metal dichalcogenides (TMDs) heterojunctions for high-performance gas sensors has garnered significant attention due to their capacity to operate at low temperatures. Herein, we realize two-dimensional (2D) WS2 nanosheets in situ grown on one-dimensional (1D) In2O3 nanofibers to form heterostructures for formaldehyde (HCHO) gas sensors. Capitalizing on the p-n heterojunctions formed between WS2 and In2O3, coupled with the high surface-to-volume ratio characteristic of 1D nanostructures, the WS2/In2O3 NFs sensor demonstrated an elevated gas response of 12.6 toward 100 ppm HCHO at 140 °C, surpassing the performance of the pristine In2O3 sensor by a factor of two. Meanwhile, the sensor presents remarkable repeatability, rapid response/recovery speed, and good long-term stability. The superior sensing capabilities of WS2/In2O3 NFs heterojunction are attributed to the combined impact of the increased charge transfer and the presence of more sites for gas adsorption. The research endows a potent approach for fabricating TMD heterojunctions to significantly enhance the gas sensing properties of gas sensors at relatively low temperatures. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 20794991 |
| DOI: | 10.3390/nano14211702 |
