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Study on the synthesis of Au/SiO2 nanocomposite hydrogel template method

Author: AiZuoZuo
Tutor: ZhengXingWang
School: Shaanxi Normal University
Course: Analytical Chemistry
Keywords: nanohydrogel template nanoparticles chitosan gold nanoparticles
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Type: Master's thesis
Year: 2013
Downloads: 58
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Abstract


In recent years, the functional nanomaterials have been widely developed in different fields such as biology, chemistry, catalytic research and so on, due to their excellent chemical properties. Among these nanomaterials, Au/SiO2nanocomposites was paid to much attention since its biocompatibility and it also owned the good optical and electrochemical properties.In this thesis, I firstly reviewed the development of the synthesis of the Au/SiO2nanocomposites and also pay much attention to review the analytical application of the Au/SiO2nanocomposites. Thereafter, we proposed a new scheme to synthesize the Au/SiO2nanocomposites by using the nanohydrogel as the template and our purpose was to control structure or state of the Au nanoparticles in this nanocomposites.1. The design and synthesis of the functional Au/SiO2structural nanomaterialsHerein, a new discrete-gold-particles core and silica shell nano-structural particles was firstly synthesized by using the chitosan/PEI nano-hydrogel as the template. The transmission electron microscopy (TEM), atomic absorption spectrometry (AAS) and UV spectrum were used to characterize the structure, and they also were used to explain the possible formation mechanism of prepared Au/SiO2nanocomposites, respectively. Our results show that the prepared core-shell nanocomposites is sphere shape with the size about70nm, and the core and the shell is about25and45nm, respectively. More importantly, our result also showed that gold nanoparticles are discrete state in the core region of the nanocomposites and they effectively provide a larger surface area. Based on these observing, a new method to synthesize Au/SiO2nanocomposites was developed. Lastly, the catalytic activity of the synthsized core-shell nanocomposites was studied and Au/SiO2nanocomposites presented the better catalytic activity.2. The synthesis of Au nanoclusters based on chitosan/SiO2hydrogel composite NanoparticlesThe reverse microemulsion method is used for synthesize chitosan/SiO2nanocomposites. The synthetic process is based on the porous structure of the chitosan hydrogel and a strong affinity with silica. Specifically, hydrogen bonding and supramolecular forces between chitosan hydrogel and silica can make the silica deposit in the chitosan skeleton structure. Thus, we successfully prepared microporous structure chitosan/SiO2nanocomposites. Then, the nanocomposites as a template has used to synthetize gold nanoclusters. Finally, the resonance scattering characteristics of gold nanocluster is applied to detect sulfur ion. Under the optimal conditions, the scattering intensity was proportional to the concentration of sulfur ion in range of1.00－6～1.0×10-4mol/L.

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