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Schematic diagram of a gas sensor based on the prepared nanoparticles.Schematic diagram of the gas sensor testing measurement system.XRD patterns of Au/ZnO NPs modified with different Au-contents (Au/Zn at.%).Overview images of Au-ZnO synthesized using bamboo cellulose template (a) FE-SEM images of Au-ZnO NPs modified with different Au-contents of 0 % (b), 1% (c), 3% (d), 5% (e) and 7% (f).EDS pattern of the Au(7 at.%)/ZnO NPs.Responses (R) of ZnO and Au/ZnO NPs to different gases with a concentration of 100 ppm at 240 °C.Responses (R) of Au/ZnO modified with different Au-content versus working temperature (T).Responses (R) of Au/ZnO modified with different Au-content versus ethanol concentration (C); the inset shows the resistance related to response and recovery time.Gas-sensing cycle test of Au(7 at.%)/ZnO to 100 ppm ethanol at 240 °C.