SiO2／Ag核壳复合粒子的制备与表征

首次引入活性SiO2微球作为核基，采用自组装液相还原技术，定向的在核基上沉积纳米银颗粒得到SiO2／Ag核壳复合粒子；并用红外、x射线衍射、场发射扫描电镜、能谱等分析表征该核壳复合粒子的形貌与结构。结果表明：利用活性SiO2作为核基，pH值为12．4，有表面活性剂参与的条件下，通过改变银前驱体浓度，可实现表面包覆致密、银壳厚度可控的核壳复合粒子化学制备技术。

Preparation and characterization of silver coated silica microspheres core-shell composite particles

Silver coated silica microspheres core-shell composite particles could be prepared by first introducing activated silica microspheres as a nuclear, with the self-assembled liquid-reduction technology, because the silver nanoparticals would easily deposit on this nuclear directly. The morphology and structure of these nanocomposite particles were characterized by an Infrared Spectrogram, X-ray diffraction, Scanning electron microscope and X-ray energy dispersive spectrum. The results show that the technology of preparing silica core-silver shell particles which coated dense silver shell have been realized with activated silica as nuclear, the pH of 12.4, a surfactant in the conditions, and the thickness of silver shell is controllable by changing the silver precursor concentration.