Gold nanorod with high yield and great slenderness ratio and preparation method of gold nanorod

Abstract

The invention provides a gold nanorod with high yield and great slenderness ratio and a preparation method of the gold nanorod. A small number of hexadecylamine type cation surfactant ingredients with greater head groups are added into growth solution of the traditional seed growth method, the hexadecyl trimethyl ammonium bromide double-layer structure adsorbed on the surface of a gold rod can be partially substituted in the growth process through the ingredient addition, and the greater heat groups can tightly wrap the gold nanorod, so the substance exchange between the naked side surface of the gold nanorod and the growth solution is effectively inhabited, because the top point of the gold rod has greater curvature, the influence of the wrapping effect on the growth is less, and the slender gold nanorod with great slenderness ratio is obtained. For the continuous adjustment of the resonant wavelength of plasmas at the longitudinal surface of the synthesized gold nanorod, chloroauric acid hydrated is adopted as an oxidant so that the gold nanorod is gradually shortened, and the diameter of the gold nanorod is maintained unchanged.

Description

technical field [0001] The application of the present invention relates to a gold nanorod with high yield and large aspect ratio and a preparation method thereof, belonging to the technical field of nanomaterial preparation. Background technique [0002] Gold nanorods are rod-shaped gold nanoparticles ranging from a few nanometers to hundreds of nanometers. In recent years, due to their unique surface plasmon properties, they have attracted extensive attention from researchers. They are widely used in biosensing, optical storage, catalysis, and nanoelectronics. And clinical treatment and other fields have shown great application prospects. [0003] A variety of methods have been developed to prepare gold nanorods, including electrochemical reduction, photochemical synthesis, and seed growth. Among these methods, the seed growth method proposed and improved by the groups led by American scientists Murphy and EI~Sayed respectively is the most mature, and can obtain gold nanor...

AI Technical Summary

Problems solved by technology

However, the highest yield of gold nanorods prepared by the reported three-step method is less than 50%, and multi-step purification is required, which is not conducive to the large-scale application of gold nanorods; The gold nanorods with bulk resonance wavelength need to be adjusted after the synthesized gold nanorods

Commonly used methods include adding sulfide, heat treatment and oxygen oxidation, etc. Once these reactions are started, it is often difficult to precisely control and stop them. Therefore, it is necessary to develop a controllable and pollution-free resonance wavelength adjustment method for gold nanorods.

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