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Synthesis and self-assembly of monodisperse silver-nanocrystal-doped silica particles

2007; Elsevier BV; Volume: 308; Issue: 2 Linguagem: Inglês

10.1016/j.jcis.2006.12.071

1095-7103

Chen Dong, Linlin Li, LIU Jian-Shu, Shuo Qi, Fangqiong Tang, Xiangling Ren, Wei Wu, Jun Ren, Lin Zhang,

Quantum Dots Synthesis And Properties

A simple method based on the Stöber reaction was developed to prepare silver-nanocrystal-doped silica composite particles. The silane coupling agent N-[3-(trimethoxysilyl)dropyl]ethylene diamine (TSD) incorporated Ag+ into a siloxane framework and a further chemical reducer reduced Ag+ to silver nanoparticles. TEM images showed that, in the presence of TSD, silver nanocrystals (fcc) of 2-8 nm were homogeneously doped in the silica particles, which showed a typical surface plasmon resonance (SPR) peak. The as-prepared Ag/SiO2 composite particles can be self-assembled into long-range ordered lattices (or photonic crystals) over large areas.