Kim Kwan, Kim Hyung Soo, Park Hyoung Kun
Laboratory of Intelligent Interfaces, Department of Chemistry, Seoul National University, Seoul 151-742, Korea.
Langmuir. 2006 Sep 12;22(19):8083-8. doi: 10.1021/la0612015.
In this paper we describe a very simple electroless plating method used to prepare Ag-coated silica beads. Robust Ag nanostructures can be reproducibly fabricated by soaking silica beads in ethanolic solutions of AgNO(3) and butylamine. When the molar ratio of butylamine to AgNO(3) is far below 1.0, distinct nanosized Ag particles are formed on the silica beads, but by increasing the amount of butylamine, network-like Ag nanostructures are formed that possess very broad UV/vis absorption characteristics extending from near-UV to near-infrared regions. In conformity with the UV/vis absorption characteristics, the Ag-deposited silica beads were highly efficient surface-enhanced Raman scattering (SERS) substrates, with the enhancement factor estimated using benzenethiol as a model adsorbate to be larger than 10(6). Since another silica layer can be readily deposited onto the Ag surface, the Ag-coated silica beads should be invaluable in the development of SERS-based biosensors.
在本文中，我们描述了一种用于制备银包覆二氧化硅微珠的非常简单的化学镀方法。通过将二氧化硅微珠浸泡在硝酸银和丁胺的乙醇溶液中，可以可重复地制备出坚固的银纳米结构。当丁胺与硝酸银的摩尔比远低于1.0时，在二氧化硅微珠上形成明显的纳米级银颗粒，但通过增加丁胺的量，会形成具有从近紫外到近红外区域非常宽的紫外/可见吸收特性的网络状银纳米结构。与紫外/可见吸收特性一致，沉积银的二氧化硅微珠是高效的表面增强拉曼散射（SERS）基底，使用苯硫醇作为模型吸附质估计的增强因子大于10^6。由于可以很容易地在银表面再沉积一层二氧化硅层，银包覆的二氧化硅微珠在基于SERS的生物传感器开发中应该具有极高的价值。
