Chiral Au Nanorods: Synthesis, Chirality Origin, and Applications

Abstract

Chiral Au nanorods (c-Au NRs) with diverse architectures constitute an interesting nanospecies in the field of chiral nanophotonics. The numerous possible plasmonic behaviors of Au NRs can be coupled with chirality to initiate, tune, and amplify their chiroptical response. Interdisciplinary technologies have boosted the development of fabrication and applications of c-Au NRs. Herein, we have focused on the role of chirality in c-Au NRs which helps to manipulate the light− matter interaction in nontraditional ways. A broad overview on the chirality origin, chirality transfer, chiroptical activities, artificially synthetic methodologies, and circularly polarized applications of c-Au NRs will be summarized and discussed. A deeper understanding of light−matter interaction in c-Au NRs will help to manipulate the chirality at the nanoscale, reveal the natural evolution process taking place, and set up a series of circularly polarized applications.

Coated Chiral Plasmonic Nanorods with Enhanced Structural Stability

“…In the particular case of plasmonic nanomaterials, chiral structures have been reported for both individual nanoparticles (NPs) and multi-NP assemblies, which result in the so-called plasmonic optical activity. In practice, the chiroptical response can be recorded as plasmonic circular dichroism (CD), i.e., different interactions with circularly polarized light of opposite handedness, through excitation of asymmetric localized surface plasmon resonances (LSPRs). − Since the demonstration of the colloidal synthesis of highly efficient chiral Au helicoids by Nam et al, the synthesis of intrinsically chiral plasmonic NPs has seen a rapid development of various chiral Au NPs with different structures, including chiral nanorods (NRs), − nanoprisms, , nanorings, nanobipyramids, , and other helicoids. , Some of these studies involve applications of such chiral NPs in circularly polarized luminescence, , surface-enhanced Raman scattering, enantiomer-dependent immunological response, , and biosensing, which reflect the great potential of chiral plasmonic NPs. Considering the widespread presence of chirality in biological systems, much room is left for many other biological and clinical applications of chiral plasmonic NPs …”

Advances in Enantiomer-Dependent Nanotherapeutics

“…The fabrication of mirror-symmetric geometries in inorganic materials by top-down techniques including electron beam lithography is often the starting point for studying materials with chiral lattices . Recent research has also focused on developing bottom-up synthesis strategies to create chiral plasmonic gold nanostructures, including nanocubes and nanorods, with precise control of their chirality for easy and versatile fabrication. , However, if we focus on the chirality of such materials, this requires obtaining NPs as nonracemic wholes, which also implies the need to obtain the existence of chiral deviations at the atomic scale during NP growth. It is important to note that in such chiral structures, the chirality is only from the inorganic nucleus and not from surface ligands, and it is also worth investigating whether chiral stacking of atoms in the nucleus is mainly attributed to the inorganic nucleus or surface ligands.…”

Chiral Magnetic Oxide Nanomaterials: Magnetism Meets Chirality

“…[27][28][29] During the recent decades, much research effort has been devoted to endowing chirality to metallic nanomaterials, with the aim to explore their strong light-matter interactions. [30][31][32][33][34][35] The combination of chirality and magnetism in magnetic oxide nanomaterials (MONs) provides chiral MONs (CMONs) with novel functionalities and potential applications as shown in Figure 1. [36][37][38][39][40] The electromagnetic properties of chiral materials have been investigated under a static magnetic field by manipulating the interaction behaviors with light.…”