The development of moisture-resistant room-temperature gas sensors based on semiconductor functional materials has always been a hot and difficult research topic in the field of gas sensors.Considering the high sensitivity and stability of metal oxide semiconductor,the room-temperature gas-sensing behaviors of MXene(Ti3C2Tx)and the hydrophobicity of polytetrafluoroethylene(PTFE),the PTFE/ZnO/MXene composite films were prepared by depositing the PTFE and ZnO layers orderly onto the MXene film surface via a magnetron sputtering method,followed by the construction of the gas sensors based on the composite films.The PTFE/ZnO/MXene composite films were characterized by SEM,TEM and XPS,and the gas-sensing and humidity-resistant properties of the composite films-based gas sensors were investigated.Results show that the PTFE/ZnO/Ti3C2Tx composite films-based gas sensors exhibite good selectivity,high sensitivity,and excellent reproducibility towards ammonia at room temperature.With the increase of the thickness of the PTFE layers,the humidity resistance of the composite films-based gas sensors gradually increases,but at the cost of sensitivity.
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