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Abstract: For developing highly sensitive, selective and stable gas sensing materials for the detection of volatile organic compounds, we report porous micro/nano-level structure Ag-LaFeO3 nanoparticles which have been successfully synthesized using a lotus leaf as a bio-template via a sol-gel process. Combined with the molecular imprinting technique, the selectivity of the gas sensor can be altered and enhanced gas-sensing properties are obtained due to the unique molecular recognition and large specific surface area. The Ag-LaFeO3 nanoparticles are found to exhibit an ultrahigh xylene response (Rg/Ra = 16.76 to 10 ppm), fast gas response and recovery (68 and 36 s) and superior selectivity against the other tested interfering gases at a relatively low operating temperature of 125 °C. They also exhibit excellent humidity stability and long-term stability with small deviations, and this result may deliver a new approach that enables the stable detection of xylene gas
Template and target information: xylene