Abstract
Two-dimensional SnS2 with stable electron transport capacity, high specific surface area, and high surface activity due to defects such as sulfur vacancies, is a suitable candidate for gas sensors at room temperature. Here, ultra-thin SnS2 nanopetals are synthesized and planar type sensors are obtained through coating SnS2 on a substrate with interdigitated electrodes. Samples annealed at different temperatures were characterized and their gas-sensing properties were compared. The sensor annealed at 200 °C in the air of the muffle furnace (SnS2-200) exhibits the best sensing performance with the high response of 24.20 to 100 ppb NO2 at RT and ultra-low detection limit of 5 ppb NO2. Moreover, the SnS2-200 sensor also possesses good repeatability, selectivity and long-term stability. The excellent sensing performances prove that the SnS2 holds excellent application prospects in the detection of trace-level NO2.
Published Version
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