亲水性氧化锌纳米粒子控制合成及光学性质研究

Study on Controllable Synthesis and Optical Properties of Hydrophilic ZnO Nanoparticles

采用溶剂热分解法,以乙酰丙酮锌为原料,在亲水性有机溶剂聚乙二醇(PEG-600)、聚乙二醇单甲醚(MPEG-1000)、三甘醇(TEG)中合成了氧化锌纳米粒子。X-射线衍射(XRD)分析表明氧化锌纳米粒子为纤锌矿晶体结构。透射电镜(TEM)形貌观察结果表明,在不同溶剂PEG-600、MPEG-1000和TEG中合成的氧化锌纳米粒子其形状分别为短棒状、颗粒状以及由小晶粒团聚而成的球状粒子。合成的氧化锌纳米粒子表面修饰有亲水性有机分子,可以稳定分散于水溶液中。紫外-可见光吸收光谱和光致发光光谱研究显示,合成的氧化锌纳米粒子具有很强的紫外带隙吸收和发光性能,表明制备的氧化锌纳米粒子结晶性好,光学性能优异。

ZnO nanoparticles were synthesized in hydrophilic polyethylene glycol （PEG-600）, methoxy polyethylene glycols （MPEG-1000） and triethylene glycol （TEG） respectively by the solvothermal method with using zinc acetylacetone as the precursor. X-ray powder diffraction （XRD） analysis indicates that the nanoparticles have wnrtzite crystal structure of ZnO. Transmission electron microscope （TEM） morphology observation shows that the shape of ZnO nanoparticles prepared with PEG-600, MPEG-1000 and TEG is short rod-like, spherical nanoparticle and sub-microspheres aggregated by small crystal grains, respectively. The as-prepared ZnO nanoparticles are stable dispersed in aqueous solution due to the coating of hydrophilic organic molecules on their surface. Ultraviolet-visible absorption spectrum （UV-vis） and photoluminescence spectrum （PL） of the as-prepared ZnO nanoparticles show strong ultraviolet band gap absorption and luminescent properties. This result demonstrates that the asprepared ZnO nanopartieles possess excellent crystalline and optical properties.