Phase Engineering of SnSeX (X = 1,2) Microstructures for High-Performance NO2 Chemiresistive Room-Temperature Sensor Systems: Toward Highly Reliable and Robust Detection Properties under Humidity and Interfering Gas Conditions

• DOI: 10.1021/acssensors.4c02153
• Publication Date: 2025-01-17T05:34:26Z
• Authors: Yeongsik Hwa; Bokyeong Kim; Hwaim Park; Yeonjin Je; Myeong Doo Ryu; Jae-Won Lee; Yong-Ryun Jo; Ha-Rim An; Byoungchul Son; Bong-Yong Jeong; Jung-Shik Kong; Tae-Hoon Kim; Min Ryou; Yeong Jae Kim; Gyeong Hee Ryu; Hyunsung Jung; Joonhee Kang; Sang-Soo Chee

Two-dimensional SnSeX (X = 1, 2) has emerged as a promising candidate for NO2 chemiresistive sensor due to remarkable affinity gas adsorption. Although their sensing mechanism primarily relies on direct charge transfer, the underlying mechanisms of SnSe and SnSe2 remain unclear, despite various reported successes in phase engineering SnSeX. Here, we investigate hydrothermal route via 1-dodecanethiol (1-DDT), which served stabilizer, comprehensively demonstrate phase-dependent detection properties. As 1-DDT concentration increases, directly confirm that structure was gradually transformed one. This transformation correlates with gradual increase responses from 45 1430%, highest value among SnSeX-based sensors. The obtained SnSe2-based sensors also exhibit good discrimination without configuration arrays, under an interfering atmosphere humidity conditions. Our computational calculation unveils these outstanding performances are attributed well-constructed coupled single Se vacancy enhance stronger adsorption than SnSe. Finally, module system based SnSe2, enabling real-time monitoring gas.