【22/08/17】2020级硕士生张旺林Advanced Science：气敏纤维素摩擦电材料-Shuangxi Nie

Gas-sensitive materials are capable of dynamic identification and content monitoring of specific gases in the environment, and their applications in the field of gas sensing are promising. However, weak adsorption properties are the main challenge limiting the application of gas-sensitive materials. This work prepared a highly adsorbent gas-sensitive cellulose nanofiber (CNF)-based triboelectric material with a layered structure and applied it to self-powered gas sensing. The layered structure of the fluorosilylated cellulose nanofiber (PFOTES-CNF)-based gas-sensitive material further enhances the adsorption of the material due to electrostatic adsorption in the electrostatic field induced by triboelectricity. It was found that the ammonia-sensitive material obtained by loading Ti3C2Tx in PFOTES-CNF has a fast response/recovery (12 s/14 s), high sensitivity response (Vair/Vgas=2.1), high selectivity response (37.6 %) and low detection limit (10 ppm) for 100 ppm of ammonia gas. In addition, the ammonia-sensitive CNF-based triboelectric material can accurately identify NH3 concentration changes in the range of 10-120 ppm and transmit the signal wirelessly to the user interface, facilitating real-time online monitoring of NH3 in the environment. This study provides a novel strategy for designing and preparing high-performance gas-sensitive composites and guides the analysis of self-powered gas sensing.