The power consumption of the chemical resistive gas sensor should be considered when its performance is developed. One of the most effective methods for reducing the power consumption is to make the gas sensor work at room temperature. A tin disulfide (SnS 2 ) nanoparticle-based gas sensor with high sensitivity and fast recovery is proposed in this paper for detecting the nitrogen dioxide (NO 2 ). The experimental results show that the SnS 2 nanoparticle-based gas sensor has excellent gas sensing performance at room temperature, including high sensitivity, rapid response/recovery speed (28 s/1 s), high selectivity and good repeatability and reversibility. The main reason for the excellent performance of the SnS 2 nanoparticle-based gas sensor is mainly attributed to the unique physical affinity and favorable electronic band positions of the SnS 2 material, which promotes the physisorption and charge transfer of NO 2 gas molecules. It is expected that this work can provide guidance for the real-time rapid detection of NO 2 at room temperature.
Graphene-based nanocomposites have been widely investigated as promising anode materials because of the high specific capacity and good rate capability. However, effective distributing the nanomaterials into graphene conductive network still remains some challenges. In this study, the supercritical carbon dioxide (SC-CO 2 ) route as a good strategy is developed to prepare SnS 2 /reduced graphene oxide (RGO) nanocomposites, which integrates the complementary effect of ultrasmall SnS 2 nanopaticle and RGO nanosheet in the nanocompositions. The SnS 2 /RGO nanocomposite exhibits high initial discharge capacity of 1466.1 mA h g −1 (100 mA g −1 ), good capacity retention of about 492 mA h g −1 (100 mA g −1 ) after 70 cycles and good rate capacity as an anode material for lithium ion batteries. These results demonstrate that supercritical CO 2 (SC-CO 2 ) possess significant technological value to enhance the energy storage properties of other two-dimensional (2D) nanocomposites.
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