A close-packed 3D plasmonic superlattice of truncated octahedral gold nanoframes

Abstract

We report the surface-enhanced Raman scattering (SERS) enhancement of three-dimensional (3D) close-packed plasmonic superlattices of truncated octahedral gold nanostructures. Experimentally, we resolved two different types of hot spots, one originates from the face-to-face contacts and the other is from the edge-to-edge contacts among the 3D close-packed plasmonic superlattice of gold nanostructures. The high degree of homogeneity of truncated octahedral Au@Pt nanoparticles (TOh Au@Pt NPs) and truncated octahedral Pt@Au nanoframes (TOh Pt@Au NFs) allowed them to self-assemble into remarkable 3D close-packed plasmonic superlattices. The morphological evolution and the corresponding optical behavior of TOh Pt@Au NFs were systematically monitored during each synthetic process. The measured SERS enhancement on the hot spots from the edge-to-edge contacts of TOh Pt@Au NFs was five times greater than the SERS response from the analogous face-to-face contacts of TOh Au@Pt NPs under the same given experimental conditions. The hollow interior and well-defined structural morphology of TOh Pt@Au NFs will allow researchers to design highly programmable 3D plasmonic superlattices for efficient SERS enhancement.

Progress of Nanomaterials in Photodynamic Therapy Against Tumor

“…Noble metal Pt nanozymes have catalase-like activity ( Cao et al, 2021 ). Truncated octahedral Au (ToHAu) can enhance LSPR by increasing the spatial separation and realizing the simultaneous participation of holes and electrons in the reaction due to the special structure of twin planes and stacking faults ( Yoon et al, 2017 ). Accordingly, Bu and his team designed and synthesized a comprehensive phototherapy nanomodulator (ToHAu@Pt-PEG-Ce6/HA) based on the enhanced LSPR effect Bu et al (2021) .…”

Completely green synthesis of rose-shaped Au nanostructures and their catalytic applications

“…9,10 Among the various reported structures, Au nanocrystals with 3D hierarchical structures such as ower-like architectures have attracted considerable attention because of their unique structural features, which include a high surface roughness, a large surface area-to-volume ratio, and abundant edges and sharp tips. [11][12][13][14][15][16][17][18] These unique features enable these nanocrystals to be used as advanced and high-performance materials, particularly catalysts. [19][20][21] Several synthesis strategies for synthesizing Au nanostructures with ower-like architectures have been reported, including a so template method, 18 hard template method, 21 electrochemical methods, 15,22 a galvanic replacement reaction, 23 and seeded-growth syntheses.…”

A Simulation Study for Field Enhancement due to Multiresonant Localized Surface Plasmon Excitation in the truncated Octahedral Gold Nanoparticle Arrays

“…An enhancement of electromagnetic field has been a main topic in nanoscale optics and related phenomena, because of its enormous potentials for various applications such as high sensitive molecular detection [1][2][3], imaging with ultrahigh spatial resolution [4][5][6][7][8][9], and ultrafast strong field emissions [10][11][12][13]. Specifically, increase of the effective cross section between light and matter due to field enhancement enabled the attomolar detection and characterization of molecules by means of the surface-Enhanced Raman Spectroscopy (SERS) recently [14][15][16]. In these researches, the assembly of closely packed, periodic arrays of single metallic nanoparticles was proven to be a key in generating hotspot with high controllability, where enormous increase of Raman scattering cross section was manifested.…”