Synthesis of Au-functionalized SnO_2 nanotubes using TeO_2 nanowires as templates and their enhanced gas sensing properties

摘要

Au-functionalized SnO_2 nanotubes were prepared for use as gas sensors using TeO_2 nanowires as templates. Transmission electron microscopy revealed tube diameters, tube lengths and tube wall thicknesses ranging from 50 to 200 nm, 5 to 50 μm, and 13 to 18 nm, respectively. The Au-functionalized SnO_2 nanotube sensors showed responses of 179-473 % to 1-5 ppm NO_2 at 300℃. These values are much higher than those obtained using bare SnO_2 nanotubes synthesized in this study and most other SnO_2 one-dimensional nanostructure-based sensors reported in the literature. The NO_2 gas sensing mechanism of the Au-functionalized SnO_2 nanotube sensors is also discussed.