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化学学报
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化学学报 ›› 2006, Vol. 64 ›› Issue (22): 2291-2295. 上一篇    下一篇

研究论文

Au和SiO2多壳结构的制备和表征

王毅, 谈勇, 丁少华, 李鹂, 钱卫平*   

  1. (东南大学生物科学与医学工程系 生物电子学国家重点实验室 南京 210096)
  • 投稿日期:2006-03-08 修回日期:2006-06-01 发布日期:2006-11-28
  • 通讯作者: 钱卫平

Fabrication and Characterization of Multishell Structures Based on Au and SiO2

WANG Yi; TAN Yong; DING Shao-Hua; LI Li; QIAN Wei-Ping*   

  1. (State Key Laboratory of Bioelectronics, Department of Biological Science and Medical Engineering, Southeast University, Nanjing 210096)
  • Received:2006-03-08 Revised:2006-06-01 Published:2006-11-28
  • Contact: QIAN Wei-Ping

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利用自组装技术和胶体还原化学, 制备出金纳米壳Au@SiO2以及SiO2包裹的金纳米壳SiO2@Au@SiO2; 去除SiO2@Au@SiO2颗粒中的金壳层, 获得含有可移动SiO2核的空心壳H-SiO2@M-SiO2. 结果显示: SiO2@Au@SiO2复合颗粒表面光滑, 并保留了金壳的近红外吸收特性; 通过改变复合颗粒外层SiO2厚度, 可以调节其等离激元共振峰的位置; 王水可以有效地去除SiO2@Au@SiO2中的金壳, 相应的等离激元共振峰消失.

关键词: 核-壳结构, 金纳米壳, SiO2包裹金纳米壳, 等离激元共振, 折射率

Gold nanoshells (Au@SiO2) and silica-covered gold nanoshells (SiO2@Au@SiO2) were fabricated by self-assembly and colloid reduction chem-istry. Hollow silica shells with movable silica spheres (H-SiO2@M-SiO2) were also prepared by the dissolution of gold shells within SiO2@Au@SiO2 particles. The results show that silica-covered gold nanoshells preserve the near-infrared absorbance of gold nanoshells. The plasmon resonance peaks of the resulting SiO2@Au@SiO2 could be controlled by changing the thickness of the outer silica shells. Furthermore, the gold shells within SiO2@Au@SiO2 particles could be removed by using aqua regia, and the related plasmon resonance peaks disappeared.

Key words: core-shell structure, gold nanoshell, silica-covered gold nanoshell, plasmon resonance, refractive index