利用自组装法在空气-水界面制备了SiO2薄膜粒子,将所制薄膜粒子先后用AgNO3溶液与Na2S2O3溶液浸泡,并充分曝光,形成了一种形状如"西瓜"的SiO2-Ag纳米复合颗粒.采用X射线衍射(XRD)、透射电子显微镜(TEM)、紫外可见吸收光谱(UV-Vis)对其结构进行了表征和分析,并初步探讨了其结构的形成机理.结果表明,纳米Ag"瓜子"均匀地分散于SiO2"瓜瓤"颗粒中,形成的复合颗粒呈球形,粒径均匀.
SiO2-based air-water interfacial films with nano structure are prepared by self-assembled technology.The films are soaked into silver nitrate aqueous solution and sodium thiosulfate separately.Then the watermelonlike SiO2/AgBr nanocomposite particles are prepared by reaction of silver nitrate and sodium thiosulfate with template agent(CTAB).The feature and structure of nanocomposite particles are characterized by X-ray diffraction,transmission electron microscope (TEM) and ultraviolet visible absorption spectrometer.The results indicate that the silver nanoparticles(melon seeds) are homogenously distributed in silicas(flesh) and pherical with uniform and narrow-dispersed size distribution.The formation mechanism of morphologies of the nanocomposite particles is also investigated.
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