Fig. 9From: Ag Nanoparticles Sensitized In2O3 Nanograin for the Ultrasensitive HCHO Detection at Room Temperaturea The response–recovery of the 5%Ag-In2O3 toward 1 ppm HCHO gas for 6 cycles at 30 °C. b Responses of 5%Ag-In2O3 sensor toward 1 ppm of HCHO under different humidity conditions at 30 °C. c Long-term stability tests of 5%Ag-In2O3 sensor toward 1 ppm HCHO after continuous evaluation for 36 days at 30 °CBack to article page