Enhanced formaldehyde sensing properties of IrO2-loaded porous foam-like Ga1.4In0.6O3 nanofibers with ultrathin pore walls

IrO 2 -loaded porous foam-like Ga 1.4 In 0.6 O 3 nanofibers with ultrathin pore walls were synthesized via a simple electrospinning and impregnation method for the detection of formaldehyde. This gas sensor based on IrO 2 -loaded Ga 1.4 In 0.6 O 3 nanofibers showed excellent sensitivity and selectivity towards trace formaldehyde. Especially, the response of the gas sensor based on 1% IrO 2 -Ga 1.4 In 0.6 O 3 nanofibers is as high as 46 towards 10 ppm formaldehyde, while it is only 7 for the gas sensor based on Ga 1.4 In 0.6 O 3 . Moreover, the gas sensor based on 1% IrO 2 -Ga 1.4 In 0.6 O 3 exhibited remarkable selectivity towards formaldehyde. The high sensitivity and good selectivity of IrO 2 -loaded porous Ga 1.4 In 0.6 O 3 nanofibers could be attributed to the specific catalytic activity of IrO 2 , the unique composition and the ultrathin structure of Ga 1.4 In 0.6 O 3 .