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CSCD
Accurate researches on the surface plasmon resonance (SPR)-based applications of chiral plasmonic metal nanoparticles (NPs) still remain a great challenge. Herein, a series of chiral plasmonic metal NPs, e.g., chiral Au nanorods (c-Au NRs), c-Au@Ag core–shell, and c-Au@TiO2 core–shell NRs, with different chiroptical activities have been produced. Plasmonic circular dichroism (PCD) bands of c-Au NRs can be precisely tailored by tuning the longitudinal SPR (LSPR) and amount of Au NRs as seeds. Besides, a shift of PCD bands within ultraviolet–visible–near infrared ray (UV–vis–NIR) region can also be achieved through the functionalization of a shell of another metal or semiconductor. Interestingly, chirality transfer from c-Au core to Ag shell leads to new PCD bands at the near-UV region. The tuning of PCD bands and chirality transfer are confirmed by our developed theoretical model. Developing chiral Au NRs-based chiral plasmonic nanomaterials with tunable chiroptical activities will be helpful to understand the structure-direct PCD and to extend circularly polarized-based applications.
This work was supported by the National Natural Science Foundation of China (Nos. 21902148, 11774036, 12174032, and 22071172), the National Key Research and Development Program of China (No. 2017YFA0303400), and the National Natural Science Foundation of China-Research Grant Council (No. 11861161002). K. Y. W. acknowledges the support by the Patrick S. C. Poon endowed professorship. Luis M. Liz-marzan, Jorge Perez-Juste, and Isabel Pastoriza-Santos are thanked for their helpful comments on this work.