摘要
采用溶胶凝胶方法制备了Al掺ZnO纳米粉体。并用X射线衍射仪(XRD)和电子顺磁共振(EPR)对样品进行表征。结果表明:Al以替位形式掺入ZnO,未改变原有结构,掺杂Al离子浓度为2%时,其结晶性最好。Al掺杂ZnO粉末在g=1.96和2.00处具有明显信号峰。g=1.96位置的信号是制备过程中产生的Zn-H键的信号位置,该信号与ZnO导电特性有密切关系;g=2.00是晶体中锌空位对应的信号。g=1.96处信号峰强度与煅烧时间的长短无关;煅烧时间越长越有利于晶体结构的完善,减少空穴的产生;Al的掺入不仅替代了部分Zn的位置,也填补了部分的锌空位;温度变化起到了和Al离子同样的功效,Al离子的掺入增强了温度变化对ZnO的影响。
Al doped ZnO powders were prepared by sol-gel method and characterized by electron paramagnetic resonance and X-ray diffraction. The results show that the way of Al ion mix into ZnO is displacement doping, and the wurtzite structure of ZnO does not change. When the concentration of Al ion in ZnO is 2%,its crystallinity is the best. The Al doping in ZnO powder has two obvious signal peaks at g = 1. 96 and 2. 00, while the g =1. 96 prepares the Zn-H key signal position which in the process produced,the signal have close relation with the conductive properties of ZnO; the g =2. 00 is correspondence with the zinc vacancy signal in crystal. The calcination time has no effect on the intensity of signal peak at g = 1. 96; The longer calcining time is,the more advantageous to crystal structure consummation and reduces the production of hole; The Al mixing in it not only substituted the some Zn position but also has filled the certain zinc vacancy; The temperature has the similar effect with Al and it is enhanced the effect on the ZnO by Al ion.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2014年第4期937-944,共8页
Journal of Synthetic Crystals
基金
国家重点基础研究发展计划(973计划)(2010CB226805)
国家自然科学基金(51074155)
