LIU Shiwei, HUA Kaifeng, SU Yi, LV Xiangyu, LI Cuiling, WANG Yujiang

(Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022)

Abstract: The synthesis and characterization of nano gold catalyst for formaldehyde electro-catalytic oxidation have been studied in this paper. The catalyst was characterized by TEM, SEM and XRD. The amperometric gaseous formaldehyde sensors were assembled and tested. A linear relationship between the oxidation current and the concentration of formaldehyde is obtained and the sensitivity is 760 nA/ ppm when the formal dehyde concentration is in the range of 0 to 50 ppm.

Key words: formaldehyde, nano gold, amperometric type, electro-catalysis, gas sensor