Abstract
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 (SnO2@MoS2) was constructed by self-assembling MoS2 nanosheets array on SnO2 nanofibers. The response of SnO2@MoS2 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 MoS2 based core-shell hierarchical nanomaterials and future development of high efficiency xylene sensor.
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