中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 22 No. 2 February 2012 |
polythiophene/WO3 organic-inorganic hybrids
（TKL of Metal- and Molecule-based Material Chemistry, Key Laboratory of
Advanced Energy Materials Chemistry (MOE), Department of Chemistry, Nankai University, Tianjin 300071, China）
Abstract:Polythiophene (PTP) was prepared by a chemical oxidative polymerization and nanosized WO3 was prepared by a colloidal chemical method. The organic–inorganic PTP/WO3 hybrids with different mass fractions of PTP were obtained by a simple mechanically mixing the prepared PTP and WO3. The as-prepared PTP/WO3 hybrids have a higher thermal stability than the pure PTP. The gas sensing measurements demonstrate that the PTP/WO3 hybrid sensors exhibit higher response for detecting NO2 at low temperature than the pure PTP and WO3 sensor. The sensing mechanism is suggested to be related to the existence of p–n heterojunctions in the PTP/WO3 hybrids. The response of the PTP/WO3 hybrids is markedly influenced by the PTP mass fraction. The 20% PTP/WO3 hybrid shows high response and good selectivity to NO2 at low temperature (<90 oC). Therefore, the PTP/WO3 hybrids can be expected to be potentially used as gas sensor material for detecting NO2 at low temperature.
Key words: NO2 sensor; polythiophene/WO3; low temperature
