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Uniform Chiral Gap Synthesis for High Dissymmetry Factor in Single Plasmonic Gold Nanoparticle
journal contribution
posted on 2020-03-11, 14:46 authored by Nam Heon Cho, Gi Hyun Byun, Yae-Chan Lim, Sang Won Im, Hyeohn Kim, Hye-Eun Lee, Hyo-Yong Ahn, Ki Tae NamSynthesis
of chiral plasmonic materials has been highlighted for
the last decades with their optical properties and versatile potential
applications. Recently reported aqueous-based amino acid- and peptide-directed
synthesis of chiral plasmonic gold nanoparticles with 432 point-group
symmetry shows exceptionally high chiroptic response within 100 nm
scales. Despite its already excellent chiroptic response, a single-nanoparticle
dark field scattering study revealed that full chiroptic potential
of chiral gold nanoparticle is limited with its overall synthetic
uniformity. Based on this knowledge, we present a multi-chirality-evolution
step synthesis method for the enhancement of chiroptic response through
an increase in particle uniformity. Detailed time variant study and
interrelationship study of reaction parameters allowed the systematic
construction of design principles for chiral nanoparticles with exceptional
chiroptic response. With the application of precisely controlled growth
kinetic to two distinct growth regimes, modified chiral gold nanoparticles
showed significantly improved uniformity, achieving an improved dissymmetry
factor of g = 0.31. We expect that our strategy will
aid in precise morphology and property control for chiral nanomaterials,
which can be used in various plasmonic metamaterial applications.
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chiral gold nanoparticleuniformitychiral plasmonic gold nanoparticlesmulti-chirality-evolution step synthesis methodtime variant study100 nm scalesSingle Plasmonic Gold Nanoparticle Synthesischiroptic responseplasmonic metamaterial applicationschiral gold nanoparticleschiral plasmonic materialsUniform Chiral Gap Synthesis432 point-group symmetryHigh Dissymmetry Factor
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