在生物相容性溶液体系中金纳米链的合成及其光谱性质

Synthesis and Optical Property of Gold Nanochains in the Biocompatible Solution System

在生物相容性的葡萄糖-柠檬酸盐溶液体系中,研究了Au(III)离子的化学还原和金纳米粒子的各向异性生长;借助VIS/NIR光谱和透射电子显微镜的表征以及梯度离心分离技术,获得了具有多重孪晶、形状类似于马铃薯的链状金纳米粒子结构,其溶液具有2个表面等离子体共振吸收峰,分别呈现在光谱曲线较短和较长波长方向;研究了在含有球形和椭圆形金纳米粒子的溶液中由NaOH诱导所产生的自组装行为,获得了具有类似于金纳米棒光谱性质的金纳米链,其纵向共振吸收光谱峰位于大约800 nm波长处。简要讨论了在溶液体系中链状金纳米结构的形成和纳米粒子的自组装机理。

The chemical reduction of Au（III） ions and anisotropic growth of Au nanoparticles were studied in the biocompatible solution system containing glucose-citrate. Based on the characterization of VIS/NIR spectrum and transmission electron microscopy （TEM） as well as the technology of gradient centrifugation separation, a chain gold particle nanostructure of potato-like shape with multiple twin crystals was obtained and its solution had two characteristic surface plasmon resonance absorption peaks which appeared at the shorter and longer wavelength direction in the spectrum curve, respectively. The self- assembly property induced by NaOH in the solution containing spherical and elliptic gold nanoparticles was studied. The spectral curve profile of obtaining gold nanochains was similar to that of gold nanorod and the corresponding maximum longitudinal plasmon resonance absorption was located at longer wavelength≈800 nm. The formation of the chain gold nanostructure and self-assembly mechanism of gold nanoparticles are discussed briefly.