聚共轭亚油酸基网状纳米金的制备及表面增强拉曼散射和催化性能

摘要

Networked poly( conjugated linoleic acid) ( PCLA) aggregates were prepared from a natural poly-merizable monomer, conjugated linoleic acid( CLA) , through a simple strategy of molecular self-assembly fol-lowed by controlled self-crosslinking. The morphology of the PCLA aggregates by transmission electron micro-scopy( TEM) , was a unique network structure with the CLA spherical particles as the junction units that were originated from the CLA micelles. Subsequently, the Au nano-network with core of CLA micelle(20 nm) was synthesized in 2 d through in situ reduction of gold on the surface of the PCLA network. It was found that the Au nano-network based on PCLA could be obtained if and only if PCLA provided both functions of in situ re-duction and model. Moreover, the Au nano-network based on PCLA displays better surface-enhanced Raman scattering( SERS ) for thiophenol and better catalytic effect on reduction of 4-nitrophenol than the normal spherical Au nanoparticles [(5±1) nm] does.%以天然不饱和脂肪酸共轭亚油酸( CLA)为绿色单体,通过简单的分子自组装和可控自交联反应制备聚共轭亚油酸(PCLA)聚集体。透射电子显微镜(TEM)结果显示, PCLA聚集体的形貌呈现独特网状结构,其联结单元为来自于CLA胶束的膨大颗粒。采用氯金酸在极性聚合物表面原位还原,2 d后在网状PCLA基底上制备得到以CLA胶束为核(20 nm)的网状纳米金结构,而且网状PCLA的原位还原作用与模板作用相结合是获得PCLA基网状纳米金的充分必要条件。与普通球形胶态金纳米颗粒[(5±1) nm]相比, PCLA基网状纳米金对苯硫酚具有更好的表面增强拉曼散射( SERS)效应,对对硝基苯酚具有更好的催化还原效果。