Self-Assembled Peptide Functionalized Gold Nanopolyhedrons with Excellent Chiral Optical Properties

Abstract

Because of the unique optical properties of gold nanomaterials, the preparation of gold nanomaterials with excellent chirality has received extensive attention. In order to develop a simple fabrication method for three-dimensional chiral Au nanostructures with a size of several hundred nanometers, chiral gold nanoparticles were developed to transfer chirality of a peptide to gold nanoparticles. In this study, the controlled synthesis of asymmetric gold nanopolyhedrons was achieved. The asymmetric gold nanopolyhedrons prepared via peptide-directed growth can exhibit strong circular dichroism (∼±50 mdeg) couplets in the visible range (500–600 nm). Also, the morphology of chiral Au nanododecahedrons-peptide particles showed distorted and asymmetric properties. In order to prove that the size and spatial structure of gold nanopolyhedrons have an influence on their chiral optical properties, Au nanotrioctahedron-peptide particles were prepared by using Au nanotrioctahedrons with different morphologies. Au nanotrioctahedron-peptide particles also exhibited circular dichromatic couplets in the visible region.

Functionalized Gold Nanoparticles: Synthesis, Properties and Biomedical Applications

“…This indicated that SPPs had a significant field enhancement effect under incident light, which enhanced the CD effect of the prepared nanododecahedral-peptide. [52] Fang et al synthesized AuNPs/GO nanocomposites and tested their catalytic properties. In the presence of NaBH 4 , they selected 4-NP to be reduced to 4-AP.…”

“…Circular dichroism spectra of Au nanododecahedrons, peptide and Au nanododecahedrons-peptide particles (f). [52] Reprinted with permission from [52]. Copyright 2019 American Chemical Society.…”

Plasmonic chiral metasurface absorber based on bilayer fourfold twisted semicircle nanostructure at optical frequency

“…It has been known that the excitation of surface plasmons resonance will produce oscillating dipole elds due to the semicircle nanostructure with small diameters compared with the incident wavelength of the different CP lights [48][49]. When RCP or LCP light illuminate onto the semicircle nanostructure, it can be reasonably believed that the selective absorption and giant CD effect will emerge in the proposed CMSA and consequently resutling in the different distribution of the electric eld and magnetic eld components in each layer [49][50][51][52][53][54]. It can be observed that the electric dipole power is much stronger than the magnetic one in the designed semicircle nanostructure, revealing the predominance of electric dipole oscillations.…”

Chiral-selective Plasmonic Metasurface Absorber Based on Bilayer Fourfold Twisted Semicircle Nanostructure at Optical Frequency

“…The excitation of surface plasmons resonance will produce oscillating dipole elds due to the semicircle nanostructure with small diameters relative to the incident wavelength of the different CP lights [43][44][45][46]. When RCP or LCP light excites the semicircle nanostructure, a chiral-selective absorption and giant CD effect will occur, and the electric eld and magnetic eld components of each layer are different due to the chirality [46][47][48][49][50][51]. charges are separated and mainly accumulated at the corners of the each semicircle nanostructure, acting like an electric dipole.…”