玻璃微珠/银核壳纳米复合粒子的制备及表征

通过添加聚合物表面活性剂,采用原位复合法制备了具有面心立方结构壳层的草莓状银包玻璃微珠核壳纳米复合粒子.用X射线衍射、扫描电镜及透射电镜等表征了复合粒子的形貌和结构.结果表明:随着溶液pH值的升高,反应速率加快,银的析出量增大,壳层银纳米粒子的特征峰也越强.十二烷基硫酸钠的加入使得表面呈蓬松态,而聚乙烯吡咯烷酮则使表面均匀致密,羧甲基纤维素钠使壳层颗粒生长呈不对称分布.随着银氨溶液浓度的增加,经液相还原的银纳米粒子相应增多,复合粒子壳层厚度也逐渐从30nm增大到52nm左右.

PREPARATION AND CHARACTERIZATION OF GLASS SPHERE/SILVER CORE-SHELL NANOCOMPOSITE PARTICLES

Silver-glass sphere core-shell nanocomposite particles with raspberry morphology which have intact face-centered cubic structure shell were prepared by the in-situ composite technique in the presence of surfactants. Nanocomposite particles were characterized by an X-ray diffraction, scanning electron microscope and transmission electron microscope. The results show that with the increase of the pH value, the rate of the reaction quickens, the output of silver increases, and the characteristic peaks of silver nanoparticles coated on the surface of the glass spheres become stronger. The coating surface is fluffy when sodium dodecyl sulfate is used as an additive, while it is even and compact when polyvinyl pyrolidone is added, and it grows asymmetrically when sodium carboxymethylcellulose is added. With the increase of the concentration of silver ammonia solution, more silver nanoparticles are produced from the reduced reaction and the shell thickness of the nanocomposite particles grows gradually from 30 nm to 52 nm.