Porous Nd-doped In2O3 nanotubes with excellent formaldehyde sensing properties

Pure and Nd-doped porous In 2 O 3 nanotubes have been successfully synthesized by single-capillary electrospinning method. The SEM images displays the novel structure of Nd-doped In 2 O 3 which has pores distributed on the surface of nanotubes. The subsequent test results demonstrate that Nd-doped porous In 2 O 3 nanotubes possess excellent gas-sensing properties to formaldehyde. The response of Nd-doped porous In 2 O 3 nanotubes to 100   ppm formaldehyde is 44.6 at the optimum operating temperature of 240   °C, which is 3.6 times larger than that of pure porous In 2 O 3 nanotubes (12.5), and the response and recovery times to 100   ppm formaldehyde are 15 and 50   s, respectively.