Construction of SnO2 nanofibers @ MoS2 nanosheets core-shell nanocomposites for high efficiency xylene detection

As a typical pollution gas , xylene poses a particularly serious threat to human health. The xylene sensors with low operating temperature, fast response speed, sufficient detection limit and satisfactory selectivity are required for safety protection. Herein, a novel xylene sensitive material (SnO 2 @MoS 2 ) was constructed by self-assembling MoS 2 nanosheets array on SnO 2 nanofibers . The response of SnO 2 @MoS 2 sensor was 23.5–100 ppm xylene vapor, which was much higher than that of single-component sensors. Additionally, the response/recovery times were 21.5/60.4 s with a limit of detection (LOD) as low as 0.5 ppm. The good sensitive was ascribed to the unique resistance characteristics of the hierarchical structure, the regulation of electronic property by heterojunctions , and the increase of adsorption sites caused by large specific surface areas and surface defects . This work enlightens a novel strategy on the construction of MoS 2 based core-shell hierarchical nanomaterials and future development of high efficiency xylene sensor.