Groovy chiral gold particles Although plasmonic optical activity can arise from chiral assemblies of gold and silver nanoparticles, there are few examples of gold nanoparticles with intrinsic chirality and high optical activity. González-Rubio et al. show that morphological chirality can be induced during the seeded growth of gold nanoparticles, particularly for highly anisotropic nanorods. Chiral additives as cosurfactants formed helical micelles that directed the seeded growth to create grooves that maintained a chiral morphology. The resulting particles displayed high-intensity circular dichroism with anisotropy factors near 0.2 at near-infrared wavelengths. Science, this issue p. 1472 Seeded growth with gold nanorods and chiral micelle cosurfactants created nanoparticles with high chiroplasmonic activity. Surfactant-assisted seeded growth of metal nanoparticles (NPs) can be engineered to produce anisotropic gold nanocrystals with high chiroptical activity through the templating effect of chiral micelles formed in the presence of dissymmetric cosurfactants. Mixed micelles adsorb on gold nanorods, forming quasihelical patterns that direct seeded growth into NPs with pronounced morphological and optical handedness. Sharp chiral wrinkles lead to chiral plasmon modes with high dissymmetry factors (~0.20). Through variation of the dimensions of chiral wrinkles, the chiroptical properties can be tuned within the visible and near-infrared electromagnetic spectrum. The micelle-directed mechanism allows extension to other systems, such as the seeded growth of chiral platinum shells on gold nanorods. This approach provides a reproducible, simple, and scalable method toward the fabrication of NPs with high chiral optical activity.

中文翻译：

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各向异性金纳米晶体上的胶束定向手性种子生长

Groovy 手性金颗粒 尽管金和银纳米颗粒的手性组装可以产生等离子体光学活性，但具有内在手性和高光学活性的金纳米颗粒的例子很少。冈萨雷斯-卢比奥等。表明在金纳米粒子的种子生长过程中可以诱导形态手性，特别是对于高度各向异性的纳米棒。手性添加剂作为辅助表面活性剂形成螺旋胶束，引导种子生长以产生保持手性形态的凹槽。所得粒子在近红外波长处显示出高强度圆二色性，各向异性因子接近 0.2。科学，这个问题 p。1472 用金纳米棒和手性胶束助表面活性剂进行种子生长，产生了具有高手性等离子体活性的纳米粒子。通过在不对称助表面活性剂存在下形成的手性胶束的模板效应，可以设计表面活性剂辅助的金属纳米粒子 (NPs) 种子生长，以产生具有高手性活性的各向异性金纳米晶体。混合胶束吸附在金纳米棒上，形成准螺旋图案，引导种子生长成具有明显形态和光学手性的纳米颗粒。尖锐的手性皱纹导致具有高不对称因子 (~0.20) 的手性等离子体模式。通过改变手性皱纹的尺寸，可以在可见光和近红外电磁光谱内调整手性特性。胶束导向机制允许扩展到其他系统，例如金纳米棒上手性铂壳的种子生长。这种方法提供了一种可重复的、简单的、