The synthesis of Au/SiO2 nanocomposites using chitosan/ PEI composite nanohydrogel as template
DANG Jie, AI Yuanyuan，ZHENG Xingwang*
(College of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi′an 710062, Shaanxi, China)
Abstract:
The nano-structral particles with gold core and silica shell were firstly synthesized by using the chitosan/PEI based nano-hydrogel as the template. The as-prepared Au/SiO2 nanocomposites were characterized by transmission electron microscopy (TEM), UV-Visible absorption spectroscopy and atomic absorption spectrometry (AAS).The results show that the as-prepared core-shell nanocomposites are spherical with the size about 70 nm, and the size of core and the shell is about 25 and 45 nm, respectively. More importantly,the gold nanoparticler in the core-shell nanocomposites is discrete,which is favorable to provide effectively a larger specific surface area.The results in the catalytic activity indicated that the prepared nanocomposites possess better performence.
KeyWords:
nanohydrogel template; gold@silica nanoparticles; chitosan
