| Summary: | Ag@SnO<sub>2</sub> nanosheets were prepared through a hydrothermal method followed by heat treatment and a liquid reduction process. Many Ag nanoparticles (Ag NPs) were dispersed uniformly over the surface of the SnO<sub>2</sub> nanosheets. The thickness of the SnO<sub>2</sub> nanosheets was approximately 10 nm. After decoration with Ag NPs, the Ag@SnO<sub>2</sub> nanosheet sensors exhibited improved gas-sensing behaviors compared to the pure SnO<sub>2</sub> nanosheet sensor. The response of cross-linked SnO<sub>2</sub> nanosheets decorated by Ag NP sensors for 100 ppm formaldehyde vapor was up to 101.4, which was double that (45.5) of the pure SnO<sub>2</sub> nanosheet sensor. The response and recovery times of the Ag@SnO<sub>2</sub> sensor were 21 s and 23 s, respectively. The Ag@SnO<sub>2</sub> nanosheet sensors showed reasonable cycling stability, as demonstrated by testing with 100 ppm formaldehyde 10 times. The superior gas-sensing behaviors of the Ag@SnO<sub>2</sub> sensor were due to the large specific surface area, cross-linked nanostructure, and synergistic effect of the Ag NPs with huge sensitizing active sites and numerous SnO<sub>2</sub> nanosheets.
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