Zhang Lingling, Chen Yilin, Zheng Jiapeng, Lewis George R, Xia Xinyue, Ringe Emilie, Zhang Wei, Wang Jianfang
Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, 999077, China.
Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, CB3 0FS, UK.
Angew Chem Int Ed Engl. 2023 Dec 21;62(52):e202312615. doi: 10.1002/anie.202312615. Epub 2023 Nov 27.
Chiral plasmonic nanoparticles have attracted much attention because of their strong chiroptical responses and broad scientific applications. However, the types of chiral plasmonic nanoparticles have remained limited. Herein we report on a new type of chiral nanoparticle, chiral Au nanorod (NR) with five-fold rotational symmetry, which is synthesized using chiral molecules. Three different types of Au seeds (Au elongated nanodecahedrons, nanodecahedrons, and nanobipyramids) are used to study the growth behaviors. Different synthesis parameters, including the chiral molecules, surfactant, reductant, seeds, and Au precursor, are systematically varied to optimize the chiroptical responses of the chiral Au NRs. The chiral scattering measurements on the individual chiral Au NRs and their dimers are performed. Intriguingly, the chiroptical signals of the individual chiral Au NRs and their end-to-end dimers are similar, while those of the side-by-side dimers are largely reduced. Theoretical calculations and numerical simulations reveal that the different chiroptical responses of the chiral NR dimers are originated from the coupling effect between the plasmon resonance modes. Our study enriches chiral plasmonic nanoparticles and provides valuable insight for the design of plasmonic nanostructures with desired chiroptical properties.
手性等离子体纳米粒子因其强烈的手性光学响应和广泛的科学应用而备受关注。然而，手性等离子体纳米粒子的种类仍然有限。在此，我们报道了一种新型的手性纳米粒子，即具有五重旋转对称性的手性金纳米棒（NR），它是使用手性分子合成的。使用三种不同类型的金种子（金拉长纳米十面体、纳米十面体和纳米双锥体）来研究生长行为。系统地改变不同的合成参数，包括手性分子、表面活性剂、还原剂、种子和金前驱体，以优化手性金纳米棒的手性光学响应。对单个手性金纳米棒及其二聚体进行了手性散射测量。有趣的是，单个手性金纳米棒及其端对端二聚体的手性光学信号相似，而并排二聚体的信号则大幅降低。理论计算和数值模拟表明，手性纳米棒二聚体不同的手性光学响应源于等离子体共振模式之间的耦合效应。我们的研究丰富了手性等离子体纳米粒子，并为设计具有所需手性光学性质的等离子体纳米结构提供了有价值的见解。
