Ag掺杂ZnO纳米晶的发光特性

Photoluminescent Properties of Ag-Doped ZnO Nanocrystalline

以Zn(NO3)3.6 H2O,AgNO3为原料,明胶为模板分散剂,采用凝胶模板燃烧法制备纯ZnO和ZnO∶Ag纳米晶,利用XRD,SEM,TEM和PL谱对样品的结构和性能进行了研究.结果表明∶掺杂前后产物粒子形状均为球形,结晶良好,属六方晶系结构且无杂相;Ag占据部分Zn格位或填隙位进入ZnO晶格,掺入量约为1%(摩尔分数);纯ZnO平均粒径约为40 nm,掺杂样品的平均粒径约为45 nm,Ag掺杂轻微地影响ZnO晶粒生长.PL谱显示Ag掺杂能够调整ZnO纳米晶的能带结构?提高表面态含量,进而使得ZnO:Ag纳米晶的可见发光能力显著增强.

Pure and Ag-doped ZnO nanocrystalline have been successfully synthesized by means of gel-template combustion process using Zn（NO3）2·6H2O and AgNO3 as raw material and gelatin as a based template dispersant.The structure and properties of the as-synthesized samples were characterized by using XRD,SEM,TEM and PL techniques.The results show that the hexagonal products appear to be regularly spherical and the crystallinities are good.Ag＋ substituted Zn or gap positions to incorporate into nanocrystalline,the dopant content is about 1%（mole fraction）.The average particle sizes of pure ZnO nanocrystalline are about 40 nm,whereas the corresponding parameters of doped ZnO are respectively about 45 nm.This indicates that Ag doping could influence the growth of ZnO nanocrystalline.In addition,the Ag doping could tune the energy level structure and enrich the surface states of ZnO nanocrystalline,which leads to a stronger green emission peak at around 484 nm and 495 nm.