锌掺杂氧化镍纳米线的制备及氧化镍基气敏传感器性能的研究

Fabrication of Zinc-doped Nickel Oxide Nanowires and Research on Gas Sensors based on NiO

为了提高NiO气敏材料的响应和恢复速度,采用磁场诱导肼还原法和高温氧化法制备Zn掺杂NiO纳米线,研究Zn掺NiO纳米线基传感器对于氨气的敏感性能。结果表明：随着Zn掺杂浓度的提高（摩尔分数2%～5%）,XRD衍射峰向小角度偏移0.2°～0.4°,且晶面间距增大0.01～0.02 nm,均说明锌离子已成功掺入到NiO晶格中;与未掺杂的NiO纳米线传感器相比,掺杂Zn的NiO纳米线传感器的响应速度提升了6～8倍,恢复速度提升了108～120倍;掺杂的NiO基气敏传感器同时拥有着优异的稳定性和选择性。

In order to improve the responses and recovery speeds of NiO gas sensing materials , Zn-doped NiO nanowires are pre-pared via reduction of Magnetic field induced hydrazine combined with subsequent high temperature oxidation , sensitivity to ammonia of sensors is researched based on Zinc-doped Nickel oxide nanowires .Results obtained from the research show that all the peaks of XRD have a slight shift toward lower angles （0.2＆#176;~0.4＆#176;） and the interplanar distance has a slight increase （0.01~0.02 nm） with in-creasing Zn dopant concentration from 2 to 5mol%, which is assigned to the successful incorporation of zinc ions in the NiO host struc-ture.The gas sensor based on NiO nanowires with 2~5mol%of Zn doping has 6~8 times faster response speed , and 108~120 times faster recovery speed than pure NiO sensor .Meanwhile, the doped NiO sensor has excellent stability and selectivity toward NH 3 gas o-ver other organic gases .