ANSYS software is used to optimize the electrode structure of a gas sensor.The gas sensor for formaldehyde measurement was fabricated using plane technology on 3 mm×2 mm silicon substrate.The sensing films of Pd-doped SnO2 were synthesized by sol-gel.The average grain size of SnO2 is about 15 nm.The best heating temperature was about 230℃.The sensitivity under different gas volume was measured in 230℃,and also,the response and recovery times were measured.The experiment showed that the sensitivity of the se...