Mechanosynthesis and gas-sensing properties of In2O3/SnO2 nanocomposites

作者：Yang HM^*; Zhang XC; Tang AD

来源：Nanotechnology, 2006, 17(12): 2860-2864.

DOI：10.1088/0957-4484/17/12/006

We report the successful synthesis of 30 wt% In2O3/SnO2 nanocomposites by heating the precursor obtained via a mechanochemical reaction, and investigate their gas-sensing properties. The samples were characterized by means of x-ray diffraction, scanning electron microscopy and x-ray photoelectron spectroscopy. Subsequent thermal treatment of the precursor for 2 h in air at 700 degrees C resulted in the formation of In2O3/SnO2 nanocomposites with an average crystal size of about 22 nm. In comparison to pure SnO2, the gas sensor fabricated from the as-synthesized In2O3/SnO2 nanocomposites has an excellent gas-sensing performance, such as high sensitivity (93 for 1000 ppm C2H5OH), a rapid response rate (within 5 s for 90% response and recovery times) and high selectivity to ethanol. To explain the enhanced sensitivity of the In2O3/SnO2 gas sensor, the gas-sensing mechanism is discussed.

• 出版日期2006-6-28
• 单位中南大学