铝掺杂纳米氧化锌的液相火焰燃烧合成及其导电性研究

Al-doped ZnO Nano-particles Synthesized by Liquid-Feed Flame Spray Pyrolysis and Electrical Conductivity Study

采用液相火焰燃烧合成法制备得到了Al掺杂纳米氧化锌,该技术具有简单、连续和易于大规模产业化等优点。对合成得到的纳米ZnO进行了SEM和XRD表征,燃烧产物为直径约30~40nm的球形颗粒,为六方相结构。当掺杂浓度超过8mol%时导电氧化锌中出现立方相的ZnAl2O4尖晶石。Al掺杂纳米ZnO的导电性随着Al掺杂量的增加首先迅速提高,之后提高幅度逐渐变缓,在Al掺杂量为8.0mol%时,导电氧化锌的导电性最佳,而当掺杂量进一步增加后导电性反而有所降低。

Al-doped ZnO nano-particles were synthesized by liquid-feed flame spray pyrolysis, a single step, continuous, and scaleable process. The as-synthesized ZnO nano-particles were characterized by SEM and XRD. They exhibited small crystallite size ranging from 30 to 40 nm with spherical shape, and the crystal structure was wurtzite. The electrical conductivity of the ZnO nano-particles after reducing atmosphere heat treatment was investigated by varying Al doping concentration, and a minimum resistance was obtained at the doping concentration of 8 mol%.