Abstract
Pt and Ag-codoped Te2O5 nanowires were synthesized by using a two-step process: thermal oxidation of Te powders followed by sputter-deposition of Ag. Multiple-networked sensors were fabricated by using four different types of nanowires: Pt and Ag-codoped Te2O5 nanowires, Ptdoped Te2O5 nanowires, Ag-doped Te2O5 nanowires and pristine Te2O5 nanowires; their acetone gas sensing properties were examined. The Pt and Ag-codoped Te2O5 nanowire sensor exhibited stronger response to acetone gas than the monometal-doped counterparts, as well as the undoped Te2O5 nanowire sensor. The codoped Te2O5 nanowire sensor also showed faster response to acetone gas than the latter. All four sensors showed an optimal operating temperature of 150 °C for acetone gas sensing and selectivity for acetone gas over CO, toluene, benzene and LPG gases. The underlying mechanism of the enhanced sensing performance of the Pt and Ag-codoped Te2O5 nanowire sensor is discussed.
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