Structural controls of AuNR@mSiO₂: tuning of the SPR, and manipulation of the silica shell thickness and structure

Abstract

End-selective etching the AuNRs of AuNR@mSiO2 can be managed to produce cavity-possessing, rattle-type, hollow, and shape-adaptive silica-coated nanocomposites.

Gold Nanorods: The Most Versatile Plasmonic Nanoparticles

“…The modified Stöber method has great flexibility due to its simple, time-saving, and operable procedure. First, the m-SiO 2 shell can be used to encapsulate Au-NR-based assemblies, such as Au NR dimers, random aggregates, and Au NR–quantum dot conjugates, to enhance their stability. − The mesopores can be used as nanoscale channels to allow for the diffusion of the oxidizing agent to selectively etch the Au NR core or as templates for growing Au nanowires that branch out from the Au NR core . Second, the m-SiO 2 shell permits further modification with other functional materials to acquire new physical properties or enhance the plasmonic properties.…”

Spectrum and size controllable synthesis of high-quality gold nanorods using 1,7-dihydroxynaphthalene as a reducing agent

“…The advantage of the seed-mediated method also lies in the capability of controlling the aspect ratio of AuNRs via changes in experimental conditions including silver ions, 20 cetyltrimethylammonium bromide (CTAB), 24 reducing agents, 25 hydrochloric acid, 26,27 and additives. 28,29 Due to the relatively linear relation existing between the LSPR wavelength and its added amount, silver ions are the most commonly used means for controlling. 19,20 This silver ion-dependent prepoerty originates from the growth mechanism called under-potential deposition of silver ion (Ag-UPD) that leads to the growth confinement of AuNR's diameter and growth facilitation of length.…”

Irregular particle morphology and membrane rupture facilitate ion gradients in the lumen of phagosomes

“…They might also have potential therapeutic applications, as the membrane rupturing by nanoparticles might be used for drug delivery ( 36 ) or to improve the immunogenicity of nanoparticle vaccination ( 14 ). Mesoporous spherical ( 37 , 38 , 39 , 40 , 41 , 42 ) as well as rod-shaped ( 43 ) silica particles are used as platforms for intracellular drug delivery. Silica nanoparticles with mesoscale porosity and virus-like size and nano-scale spikes have been proved to be promising drug-delivery systems in anti-cancer therapies ( 44 ).…”