Department of Solid State Physics, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India.
J Colloid Interface Sci. 2011 Jan 1;353(1):30-8. doi: 10.1016/j.jcis.2010.09.055. Epub 2010 Sep 25.
ZnO nanoparticles in the form of quantum dots (QDs) have been dispersed in SiO(2) matrix using StÖber method to form ZnO QDs-SiO(2) nanocomposites. Addition of tetraethyl orthosilicate (TEOS) to an ethanolic solution of ZnO nanoparticles produces random dispersion. On the other hand, addition of ZnO nanoparticles to an already hydrolyzed ethanolic TEOS solution results in a chain-like ordered dispersion. The photoluminescence spectra of the as-grown nanocomposites show strong emission in the ultraviolet region. When annealed at higher temperature, depending on the sample type, these show strong red or white emission. Interestingly, when the excitation is removed, the orderly dispersed ZnO QDs-SiO(2) composite shows a very bright blue fluorescence visible by naked eyes for few seconds indicating their promise for display applications. The emission property has been explained in the light of structure-property relationship.
采用 StÖber 法将 ZnO 纳米粒子制成量子点（QDs）的形式分散在 SiO(2)基质中，形成 ZnO QDs-SiO(2)纳米复合材料。将正硅酸乙酯（TEOS）添加到 ZnO 纳米粒子的乙醇溶液中会产生随机分散。另一方面，将 ZnO 纳米粒子添加到已经水解的乙醇 TEOS 溶液中会导致链状有序分散。生长的纳米复合材料的光致发光光谱在紫外区域显示出强烈的发射。在较高温度下退火时，根据样品类型，这些样品显示出强烈的红色或白色发射。有趣的是，当去除激发时，有序分散的 ZnO QDs-SiO(2)复合材料会发出非常明亮的蓝色荧光，肉眼可见几秒钟，这表明它们有望用于显示应用。根据结构-性质关系解释了发射性质。
