Department of Chemistry, Seoul National University, Seoul 151-742, Republic of Korea.
J Colloid Interface Sci. 2010 May 1;345(1):103-8. doi: 10.1016/j.jcis.2010.01.039. Epub 2010 Jan 18.
A one-pot, size-controlled preparation of amine-functionalized silver nanoparticles is possible using poly(ethylenimine) (PEI) as a reducing and a stabilizing agent simultaneously. The PEI-stabilized Ag nanoparticles thus prepared in aqueous phase can further be assembled into 2-dimensional (2-D) arrays at the water-toluene interface by heating. By the addition of benzenethiol (BT) into the toluene, a more robust 2-D film is formed, not only at the interface but also on the inner surface of the sampling bottle. The latter Ag film can also be formed, through brief contact with the mixture, on glass slides and even on dielectric beads and cotton fabrics. These Ag-coated films are highly surface-enhanced Raman scattering (SERS) active and also exhibit a very intense SERS spectrum of 4-aminobenzenethiol (4-ABT) or 4-nitrobenzenethiol (4-NBT) via a place-exchange reaction that takes place between BT and 4-ABT or 4-NBT. In addition, the Ag-coated fabrics would be used as antibacterial gauzes for the treatment of burned skin and also as antistatic mats for the ready dissipation of electrical energy buildup. The present electroless deposition method of Ag is thus expected to serve as a technique in high demand in various fields.
一锅法、尺寸可控的胺功能化银纳米粒子的制备可以使用聚乙烯亚胺（PEI）同时作为还原剂和稳定剂。在水相中制备的 PEI 稳定的 Ag 纳米粒子可以通过加热进一步在水-甲苯界面组装成二维（2-D）阵列。通过将苯硫醇（BT）加入到甲苯中，可以在界面上形成更稳定的 2-D 膜，不仅在界面上，而且在取样瓶的内表面上也可以形成。通过与混合物短暂接触，Ag 薄膜也可以形成在玻璃载玻片上，甚至形成在介电珠和棉织物上。这些 Ag 涂层薄膜具有很高的表面增强拉曼散射（SERS）活性，并且通过苯硫醇（BT）与 4-氨基苯硫醇（4-ABT）或 4-硝基苯硫醇（4-NBT）之间的位置交换反应，也表现出非常强的 4-ABT 或 4-NBT 的 SERS 光谱。此外，Ag 涂层织物可用作烧伤皮肤的抗菌纱布，也可用作防静电垫，以迅速消散积聚的电能。因此，目前的化学镀银方法有望成为各个领域急需的技术。
