Surfactant assisted solid-state synthesis and gas sensor application of a SWCNT/SnO2 nanocomposite material.
Although tin oxide has been the most widely investigated metal oxide material for gas detection, it suffers from the large resistance and high operating temperature. This could be overcome by hybridization with nanostructured carbon. In this work, tin oxide nanoparticles with ultrasmall sizes of 1-3 nm have been uniformly coated onto bundles of single-walled carbon nanotubes by a surfactant assisted solid state synthesis approach for the first time. Gas sensor properties of the as-synthesized nanocomposite material toward NO2 (from 5 to 60 ppm) are measured at 150 degrees C. Compared to the pure carbon tubes gas sensors, the nanocomposite gas sensor responds to NO2 in low concentrations with good linearity, high sensitivity, and fast recovery, while working at a relatively low temperature.
Lu
Jun
J
Department of Chemical Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong.
Ma
Anson
A
Yang
Shihe
S
Ng
Ka Ming
KM
D002244:Carbon / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry*; D008854:Microscopy, Electron; D046529:Microscopy, Electron, Transmission; D053758:Nanoparticles / Q000737:chemistry; D036103:Nanotechnology / Q000379:methods*; D037742:Nanotubes, Carbon / Q000737:chemistry*; D009585:Nitrogen Dioxide / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D055672:Static Electricity; D013501:Surface-Active Agents / Q000737:chemistry*; D013696:Temperature; D013997:Time Factors; D017971:Tin Compounds / Q000737:chemistry*; D014961:X-Ray Diffraction
D037742:Nanotubes, Carbon; D013501:Surface-Active Agents; D017971:Tin Compounds; D002244:Carbon; C045358:stannic oxide; D009585:Nitrogen Dioxide