Facile Synthesis of Template‐Free SnS 2 with Different Morphologies and Excellent Gas‐Sensing Performance for NO 2 Gas‐Sensor Applications

• Published in: Physica status solidi. A, Applications and materials science Vol. 219; no. 20
• Main Authors: Shin, Se-Hee, Park, Jong-Hwan, Ahn, Byung-Wook, Ro, Jae Chul, Suh, Su-Jeong
• Format: Journal Article
• Language: English
• Published: 01.10.2022
• ISSN: 1862-6300; 1862-6319
• DOI: 10.1002/pssa.202100827

Herein, SnS 2 particles with two different morphologies are synthesized using a template‐free one‐step hydrothermal method. Flower‐ and plate‐like SnS 2 are obtained using different solvents, ethyl alcohol, and deionized water, respectively, under the same synthesis conditions. The flower‐like SnS 2 had a larger surface area and higher concentration of sulfur vacancies than plate‐like SnS 2 . 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 SnS 2 in the two morphologies. The gas sensitivities at 25 °C under 1 ppm NO 2 are 73.5 and 129.5 for flower‐ and plate‐like SnS 2 , respectively. Both the flower‐ and plate‐like SnS 2 gas sensors exhibited good gas selectivity for NO 2 against SO 2 , CO, and NH 3 at 25 °C. The response and recovery times are 540 and 1407 s for the flower‐like SnS 2 and 214 and 18 s for the plate‐like SnS 2 , 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 NO 2 gas‐sensing applications at 27 °C.