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New strategy towards assemble hierarchical heterostructure of SnO2/ZnO for NO2 detection in ppb-level

Abstract

Metal oxide hierarchical heterostructures (HHSs) gas sensors with controllable and novel nanostructures have attracted tremendous attention due to its multi-junctions, multi-phases, interfacial and synergic effects. Based on the various metal oxide materials, multifarious hierarchical nanostructures and heterostructures can be constructed to enhance sensor performance of the primary structure. Herein, the SnO2/ZnO HHSs are successfully prepared via the fast, simple, and low-cost microwave-assistant hydrothermal (MWAH) approach. Epitaxial growth of SnO2 nanorods (NRs) on the ZnO nanoflowers (NFs) formed the hierarchical structures are conducive to promoting the sensor performance. The detection limit is 2 ppb for NO2 based on the SnO2/ZnO HHSs. The sensor response toward 10 ppm NO2 is 52.3, which is 5- and 10-times higher than SnO2 and ZnO. The response and recovery time of SnO2/ZnO HHSs is 16 and 10 s, respectively. We believe that the strategy of synthesizing metal oxide with hierarchical heterostructures based on the MWAH method provides a novel insight for the next generation of gas sensors.

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Publication details

The article was received on 28 Jun 2019, accepted on 09 Aug 2019 and first published on 13 Aug 2019


Article type: Research Article
DOI: 10.1039/C9QI00788A
Inorg. Chem. Front., 2019, Accepted Manuscript

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    New strategy towards assemble hierarchical heterostructure of SnO2/ZnO for NO2 detection in ppb-level

    M. Xu, R. Yu, Y. Guo, C. Chen, Q. Han, J. Di, P. Song, L. Zheng, Z. Zhang, J. Yan, W. Zhao, J. Yun, C. Liu, Q. Li, Y. Wang, X. Wang and Z. Liu, Inorg. Chem. Front., 2019, Accepted Manuscript , DOI: 10.1039/C9QI00788A

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