Journal
NEW JOURNAL OF CHEMISTRY
Volume 46, Issue 32, Pages 15701-15711Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2nj02683j
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Funding
- Fundamental Research Funds for the Central Universities of NPU [G2020KY0503]
- NWPU research fund for young scholars [G2022WD01016]
- Basic Research Plan in Taicang City in China [TC2021JC04]
- Natural Science Basic Research Plan in Shaanxi Province of China [2021JM-050]
- National Natural Science Foundations of China [62004168, 62004169]
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Selective detection of noxious gases at low temperature is important in many industrial applications. In this study, SnS2/ZnS microspheres doped with 3.0 at% Sm were prepared and showed enhanced gas sensing performance, including higher response, fast response/recovery speed, low detection limit and good selectivity.
Selective detection of noxious gases at low temperature is imperative in some industrial applications. In this work, pure and Sm-doped SnS2/ZnS hierarchical microspheres were prepared by a sequential reflux condensation and hydrothermal process. The morphology, crystalline structure, defect density and chemistry composition of the as-prepared samples have been analyzed by SEM, TEM, PL, XRD and XPS spectra. Compared with sensors based on pure SnS2/ZnS samples, the 3.0 at% Sm-doped SnS2/ZnS samples exhibited a remarkable enhancement in triethylamine-sensing performance at room temperature (similar to 20 degrees C), including higher response, fast response/recovery speed, low detection limit and good selectivity. The improved gas sensing performance may be attributed to the SnS2/ZnS n-n nanoheterojunction, high crystal defect density, Sm2+/Sm3+ redox pairs, grain boundaries and gas channels in the sample. In addition, the gas sensing mechanism of the Sm-doped SnS2/ZnS hierarchical microspheres was also analyzed.
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