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Co3O4–SnO2 nanobox sensor with a PN junction and semiconductor–conductor transformation for high selectivity and sensitivity detection of H2S

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Abstract

Uniform Co3O4–SnO2 nanoboxes have been synthesized successfully by a facile annealing treatment. Their hollow and cubic structure can be retained successfully during calcination. Due to their hollow structure and PN junction, these Co3O4–SnO2 nanobox sensors can detect H2S with high sensitivity at a low temperature of 180 °C. In addition, it was found that the Co3O4–SnO2 nanobox sensors obtained at a higher annealing temperature displayed a higher sensitivity and lower recovery time to H2S in a temperature range of 500 to 700 °C. X-ray photoelectron spectroscopy (XPS) was employed to confirm that the changes in resistance and the high sensitivities of the sensors are significantly attributable to the transformation of Co3O4 to CoSx with high conductivity under an H2S atmosphere.

Graphical abstract: Co3O4–SnO2 nanobox sensor with a PN junction and semiconductor–conductor transformation for high selectivity and sensitivity detection of H2S

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Publication details

The article was received on 05 Jul 2017, accepted on 23 Aug 2017 and first published on 25 Aug 2017


Article type: Paper
DOI: 10.1039/C7CE01240C
Citation: CrystEngComm, 2017, Advance Article
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    Co3O4–SnO2 nanobox sensor with a PN junction and semiconductor–conductor transformation for high selectivity and sensitivity detection of H2S

    P. Jiang, H. Zhang, C. Chen, J. Liang, Y. Luo, M. Zhang and M. Cai, CrystEngComm, 2017, Advance Article , DOI: 10.1039/C7CE01240C

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