Yang Ping, Zhang Lipeng, Wang Yingzi
School of Material Science and Engineering, University of Jinan, Jinan 250022, PR China.
J Nanosci Nanotechnol. 2012 Dec;12(12):8999-9002. doi: 10.1166/jnn.2012.6726.
A sol-gel method has been developed to fabricate functional silica film with Au/SiO2/quantum dot (QD) core/shell/shell nanostructures which exhibited plasmonic enhanced photoluminescence (PL). Au nanoparticles (NPs) were homogeneously coated with a SiO2 shell by an optimal Stöber synthesis. Hydrophobic CdSe/ZnS QDs was transferred into water phase via a ligand exchange by a thin functional SiO2 layer consisted of partially hydrolyzed 3-aminopropyltrimethoxysilane (APS) sol. The Au/SiO2/QD core/shell/shell nanostructure was created by assembling the functional SiO2-coated QDs to the SiO2-coated Au NPs while QDs transferred into water phase. Those partially hydrolyzed APS molecules play an important role for the connection between the QDs and SiO2-coated Au NPs. The Au/SiO2/QD core/shell/shell nanostructures were embedded in functional sol-gel SiO2 films fabricated via spinning and dipping coating, in which the film revealed strong surface plasmon scattering and enhanced PL. Because of the dual functionality, the film is utilizable for various applications including biological and medical sensors, optical devices, and solar cells. This technique can serve as a general route for encapsulating a variety of nanomaterials in sol-gel films.
已开发出一种溶胶-凝胶法来制备具有金/二氧化硅/量子点（QD）核/壳/壳纳米结构的功能性二氧化硅薄膜，该结构表现出等离子体增强光致发光（PL）。通过优化的施托伯合成法，金纳米颗粒（NPs）被均匀包覆上二氧化硅壳层。疏水性的硒化镉/硫化锌量子点通过由部分水解的3-氨丙基三甲氧基硅烷（APS）溶胶组成的薄功能二氧化硅层进行配体交换转移到水相中。当量子点转移到水相中时，通过将功能化二氧化硅包覆的量子点组装到二氧化硅包覆的金纳米颗粒上，形成了金/二氧化硅/量子点核/壳/壳纳米结构。那些部分水解的APS分子在量子点与二氧化硅包覆的金纳米颗粒之间的连接中起重要作用。金/二氧化硅/量子点核/壳/壳纳米结构被嵌入通过旋涂和浸涂制备的功能性溶胶-凝胶二氧化硅薄膜中，其中薄膜显示出强烈的表面等离子体散射和增强的光致发光。由于具有双重功能，该薄膜可用于包括生物和医学传感器、光学器件和太阳能电池在内的各种应用。这种技术可作为在溶胶-凝胶薄膜中封装各种纳米材料的通用途径。
