不同溶剂和Al掺杂对微波辅助合成ZnO纳米颗粒性能的影响

Effect of Different Solvent and Al Doping on the Properties of ZnO Nanoparticles Prepared by Microwave-assisted Synthesis

利用Zn(NO3)2作为Zn源,AlCl3为Al源,以水和乙二醇为溶剂,采用微波辅助合成法制备了一系列ZnO纳米颗粒。用X射线衍射仪和扫描电子显微镜对其相结构及形貌进行了表征和分析,结果表明,得到的纳米颗粒均为纯的ZnO纤锌矿结构,但溶剂种类对纳米颗粒形貌影响较大。水溶剂和乙二醇溶剂微波辅助合成法制备的ZnO纳米颗粒禁带宽度分别为2.85eV和3.12eV,掺Al后的禁带宽度缩减到2.78eV和3.10eV。ZnO纳米颗粒在450nm和560nm左右处有由于氧空位引起的较强蓝绿光发射,掺Al的ZnO光致发光峰只在560nm左右处出现。

ZnO nanoparticles were prepared by microwave-assisted synthesis using Zn（NO3）2 as Zn source,AlCl3 as Al source,water and ethylene glycol as solvent,respectively. The morphology and composition were studied by XRD and SEM. The results show that the obtained nanoparticles are all pure ZnO wurtzite structure and the solvent greatly affect the morphology. For undoped ZnO,the band gaps are 2. 85 eV and 3. 12 eV for the samples using water and ethylene glycol as solvents,respectively. After Al doping,the band gaps change to 2. 78 eV and 3. 10 eV. The ZnO nanoparticles have relatively strong blue and green light emitting bands at the wavelength of 450 nm and 540 nm due to the oxygen vacancies,and Al doped ZnO only at about 560 nm.