The enhanced metallicity of ultrathin SnS2/MnS microflowers for effectively detecting triethylamine at low temperature

The development of low-temperature SnS2-based sensitive elements with unique surface adsorption and transport regulation for triethylamine (TEA) has always been an intractable challenge. In the present work, ultrathin SnS2/MnS microflowers with enhanced metallicity have been prepared by a facile one-step hydrothermal method, which is especially beneficial for achieving superior TEA-sensing performance under room temperature (RT) condition. Compared with pure SnS2, the SnS2/MnS-3 % can obviously exhibit higher responses of 17.85 and 23.67, faster response/recovery times of 165/506 and 156/344 s, and the enhanced gas selectivity and stability to 100 ppm TEA at 30 and 40 degrees C, respectively. Taking account of density functional theory (DFT) calculation, the transformation of SnS2-based sensors from semiconductive to metallic nature plays a critical role of the enhanced gas-sensing behavior with the increased gas molecules absorption and electron transport effi-ciency, which can provide a new strategy for constructing novel and effective sulfide RT gas-sensing composites.