在SDS-PVP团簇软模板中自组装多脚状金纳米粒子

利用十二烷基硫酸钠(SDS)与聚乙烯吡咯烷酮(PVP)组成的团簇为软模板, 在微波辅助下以柠檬酸钠为还原剂快速还原氯金酸生成金晶并自组装成多脚状金纳米粒子. TEM结果显示, 得到回转直径约为50 nm的多脚状纳米结构, 电子衍射(ED)证实其为多晶结构. XRD结果表明, 该多脚状金纳米结构主要沿(111)晶面生长, 构成该纳米结构的晶粒尺寸约为12.7 nm. SDS与PVP组成的团簇结构对金纳米粒子的形貌有显著影响, 固定PVP浓度时, 随着SDS浓度增大, 金纳米粒子的形貌由球形向多脚状转变, 同时还原产物水溶液的UV-Vis光谱在800 nm附近的吸收逐渐增强.

Self-Assembly of Multipod-like Gold Nanoparticles in the Soft Template of SDS-PVP Clusters

Gold crystals are able to self-assemble into multipod-like nanoparticles through reducing HAuCl4 by sodium citrate in the soft template composed of sodium dodecyl sulfate (SDS)-polyvinylpyrrolidone (PVP) clusters assisted by microwave irradiation. TEM image displayed directly that the reduced products possessed multipod-like morphology with equivalent diameter around 50 nm, and electron diffraction (ED) pattern indicated that the gold crystals were polycrystalline. XRD pattern suggested that the multipod-like nanoparticles were self-assembled into tiny pure gold crystals with diameter about 12.7 nm, which were grown preferentially along (111) lattice plane. The cluster of SDS-PVP had great influence on the size and shape of gold nanoparticles. At a fixed level of PVP, as the concentration of SDS increased, the shape of gold nanoparticles changed from sphere to multipod, and UV-Vis absorption spectrum of gold nanoparticles showed that absorption bands at 800 nm became stronger. The preferred multipod-like gold nanoparticles could be obtained easily and quickly by controlling the composition of the soft template of SDS-PVP clusters.