Abstract

Herein, SnS2 particles with two different morphologies are synthesized using a template‐free one‐step hydrothermal method. Flower‐ and plate‐like SnS2 are obtained using different solvents, ethyl alcohol, and deionized water, respectively, under the same synthesis conditions. The flower‐like SnS2 had a larger surface area and higher concentration of sulfur vacancies than plate‐like SnS2. The effects of the specific surface area and the number of sulfur vacancies in the gas‐sensing materials are studied using the gas‐sensing characteristics of SnS2 in the two morphologies. The gas sensitivities at 25 °C under 1 ppm NO2 are 73.5 and 129.5 for flower‐ and plate‐like SnS2, respectively. Both the flower‐ and plate‐like SnS2 gas sensors exhibited good gas selectivity for NO2 against SO2, CO, and NH3 at 25 °C. The response and recovery times are 540 and 1407 s for the flower‐like SnS2 and 214 and 18 s for the plate‐like SnS2, respectively. It is confirmed that a large specific surface area and the number of sulfur vacancies adversely affected the response and recovery times. Therefore, the plate‐like gas sensor is expected to be a good candidate for NO2 gas‐sensing applications at 27 °C.

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