A Versatile Synthetic Pathway for Producing Mesostructured Plasmonic Nanostructures

Abstract

Highly branched gold (Au) nanostructures with sharp tips are considered excellent substrates for surface‐enhanced Raman scattering (SERS)‐based sensing technologies. Here, a simple synthetic route for producing Au or Au‐Ag bimetallic mesostructures with multiple sharpened tips in the presence of carbon quantum dots (CQDs) is presented. The morphologies of these mesostructured plasmonic nanoparticles (MSPNs) can be controlled by adjusting the concentration of CQDs, reaction temperatures, and seed particles. The optimal molar ratio for [HAuCl4]/[CQDs] is found to be ≈25. At this molar ratio, the diameters of MSPNs can be tuned from 80 to 200 nm by changing the reaction temperature from 25 to 80 °C. In addition, it is found that hierarchical MSPNs consisting of multiple Au nanocrystals can be formed over the entire seed particle surface. Finally, the SERS activity of these MSPNs is examined through the detection of rhodamine 6G and methylene blue. Of the different mesostructures, the bimetallic MSPNs have the highest sensitivity with the ability to detect 10−7 m of rhodamine 6G and 10−6 m of methylene blue. The properties of these MSPN particles, made using a novel synthetic process, make them excellent candidates for SERS‐based chemical sensing applications.

Carbon dots-mediated synthesis of gold nanodendrites with extended absorption into NIR-II window for in vivo photothermal therapy

“…With the extension of reaction time, metallic Au continuously fused to form large nanoparticles. However, due to the existence of CDs, misorientations occurred at the interface of gold nanoparticles, resulting in lattice mismatches and crystal defects, thus forming a multi-branched structure [ 34 ]. Surprisingly, such unique structure enabled strong absorption with two characteristic peaks in the NIR-II window, which allowed for promising applications in deep-tissue PA and PTT (Fig.…”

Progress and prospects of nanozymes for enhanced antitumor therapy

“…With the rapid development of nanotechnology, nanomaterials which can be manipulated on atomic and molecular scale are applied in medicine (Chai et al, 2022;Wang et al, 2022c;Zhang et al, 2022d;Farheen et al, 2022;Yang et al, 2022). Novel nanomaterials have demonstrated outstanding potentials in clinical applications with diverse functions (Filik et al, 2021;Li et al, 2022b;Kim et al, 2022). Nanozymes are artificial nanomaterials that exhibit intrinsic catalytic properties similar to that of natural enzymes and are attracting a massive attention (Jiang et al, 2019;Liang and Yan, 2019).…”