Formaldehyde (HCHO) gas sensing properties of a new sensor based on a sputtered vanadium pentoxide (V2O5) thin film decorated with evaporated gold (Au) nanoparticles (NPs) are studied and reported herein. The use of Au NPs effectively increases the surface area/volume (SA/V) ratio and enhances the catalytic activity of Au metal. Experimentally, good p-type sensing characteristics, including a high sensing response ratio of 73.1% under 20 ppm HCHO/air gas and a small recovery time of 6.8 s at 225 °C, are obtained. An extremely low detecting level of 15 ppb HCHO/air is also acquired. Due to these advantages and the benefits of simple structure and easy fabrication, the studied Au NP/V2O5 device is an excellent candidate for p-type consumption formaldehyde gas sensing and complementary metal oxide sensor array (CMOSA) applications.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials