A novel type of stimuli-responsive dynamic helical polymer-metal nanoparticle nanocomposite formed by a helical poly(phenylacetylene) (PPA) combined with gold nanoparticles (AuNPs) is described. Thus, several PPA copolymers containing the ethynyl-4-benzamide of (S)-phenylglycine methyl ester (M1) to dictate the helical structure/sense of the copolymer, and the ethynyl-4-benzamide of the 11-((2-(2-(2-aminoethoxy)ethoxy)ethyl)amino)undecane-1-thiol (M2) to link the copolymer to the AuNPs are prepared. Different morphologies of these nanocomposites were obtained by considering the thiol ratio and the self-assembly properties of the PPA, which generates from dispersed AuNPs to fibre-like structures. All these nanocomposites show a dynamic chiral behaviour, it being possible to manipulate their helical sense by the action of external stimuli. Moreover, it is possible to control the aggregation of these nanocomposites into macroscopically chiral nanospheres with low polydispersity by using Ba2+ as a crosslinking agent.

中文翻译：

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手性金-PPA纳米复合材料，具有可调节的螺旋感和形态。

描述了一种新型的刺激响应的动态螺旋聚合物-金属纳米颗粒纳米复合材料，该复合材料由螺旋聚苯乙炔（PPA）与金纳米颗粒（AuNPs）结合而成。因此，几种PPA共聚物含有（S）-苯基甘氨酸甲酯（M1）的乙炔基-4-苯甲酰胺以决定共聚物的螺旋结构/感觉，以及11-（（2-（制备2-（2-氨基乙氧基）乙氧基）乙基）氨基）十一烷-1-硫醇（M2），将共聚物连接到AuNPs。通过考虑硫醇比率和PPA的自组装性能，可以得到这些纳米复合材料的不同形态，PPA的自组装性能是从分散的AuNP生成为纤维状结构。所有这些纳米复合材料都表现出动态的手性行为，可以通过外部刺激的作用来操纵它们的螺旋感。而且，