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化学学报
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化学学报 ›› 2005, Vol. 63 ›› Issue (24): 2189-2193. 上一篇    下一篇

研究论文

SiO2/Ag核壳结构纳米粒子的制备及表征

胡永红1，容建华1，刘应亮*,1，满石清2   

  1. (暨南大学 1化学系 2物理系 广州 510632)
  • 投稿日期:2005-01-27 修回日期:2005-08-29 发布日期:2005-12-28
  • 通讯作者: 刘应亮

Preparation and Characterization of SiO2/Ag Core-shellNanoparticles

HU Yong-Hong1, RONG Jian-Hua1, LIU Ying-Liang*,1, MAN Shi-Qing2   

  1. (1 Department of Chemistry, 2 Department of Physics, Jinan University, Guangzhou 510632)
  • Received:2005-01-27 Revised:2005-08-29 Published:2005-12-28
  • Contact: LIU Ying-Liang

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以金纳米粒子为表面晶种, 通过化学还原的方法制备了二氧化硅/银核壳复合纳米粒子. 采用TEM, XRD及UV/vis对其结构、形貌以及光学性质进行了表征和研究, 结果表明所得到的复合粒子粒径均匀、银纳米壳光滑完整, 厚度可控. 并且随着银纳米壳厚度的增大, 其光学等离子体共振峰逐渐蓝移. 而当银纳米粒子在二氧化硅胶粒表面上生长的过程中, 它们的共振峰又逐渐红移, 直到完整的银壳形成.

关键词: SiO2胶体粒子, Ag纳米粒子, SiO2/Ag核壳粒子, 等离子体共振吸收

By using gold nanoparticles as the surface seed, SiO2/Ag core-shell composite nanoparticles were synthesized by chemical reduction method. Their morphology, structure and optical properties were characterized and investigated by transmission electron microscopy (TEM), X-ray diffraction (XRD), UV-vis absorption spectra. The results showed that the size distribution of the fabricated composite particles was narrow, silver nanoshells were smooth and complete, and the shell thickness could be controlled. And the optical plasmon resonance became gradually blue-shifted with the increase of the thickness of silver nanoshell. While the silver nanoparticles attached on the silica surface grew, their optical plasmon peak became gradually red-shifted until a complete silver shell was formed.

Key words: silica colloid particle, silver nanoparticle, SiO2/Ag core-shell particle, plasmon resonance absorption