CN-122007400-A - Preparation method of gold nanorod assembly

CN122007400ACN 122007400 ACN122007400 ACN 122007400ACN-122007400-A

Abstract

The invention belongs to the fields of material chemistry and molecular electronics, and discloses a preparation method of a gold nanorod assembly. The preparation method comprises the steps of providing a dispersion system containing a plurality of gold nanorods in a liquid phase medium, introducing heterocyclic ring assembly molecules anchored on the surfaces of the gold nanorods into the dispersion system, wherein the heterocyclic ring assembly molecules comprise aromatic heterocyclic rings providing structural rigidity, sulfur-containing anchoring groups forming coordination bonds with the gold surfaces and groups or atoms capable of forming hydrogen bonds, and the gold nanorod assembly comprises at least two gold nanorods and the heterocyclic ring assembly molecules respectively positioned on each gold nanorod, and the two gold nanorods are connected with each other through the hydrogen bond supermolecular effect formed between complementary functional groups of the heterocyclic ring assembly molecules. The preparation of gold nanorod assemblies with high yield and linear orientation is achieved by using heterocyclic assembly molecules.

Inventors

HONG WENJING
WANG DONGDONG
LI XIAOHUI
TANG CHUN
WANG XIAOJING
Xiong Shenglun
WU WENFENG
ZHANG GUIMING
HUANG BAOGUI

Assignees

微瑞精仪(厦门)科技有限公司
厦门大学

Dates

Publication Date: 20260512
Application Date: 20260413

Claims (10)

1. The preparation method of the gold nanorod assembly is characterized by comprising the following steps of: providing a dispersion comprising a plurality of gold nanorods in a liquid medium; Introducing into the dispersion a heterocyclic assembly molecule anchored to the gold nanorod surface, the heterocyclic assembly molecule comprising an aromatic heterocycle providing structural rigidity, a sulfur-containing anchoring group forming a coordination bond with the gold surface, and a group or atom capable of forming a hydrogen bond; The gold nanorod assembly comprises at least two gold nanorods and heterocyclic assembly molecules respectively positioned on each gold nanorod, wherein the two gold nanorods are mutually connected through at least two hydrogen bonds formed between complementary functional groups of the heterocyclic assembly molecules.
2. The method according to claim 1, wherein the aromatic heterocycle is a pyridine ring.
3. The method according to claim 1, wherein the sulfur-containing anchor group forming a coordinate bond with the gold surface is at least one of a mercapto group and a thiomethyl group.
4. The method according to claim 1, wherein the sulfur-containing anchor group forming a coordinate bond with the gold surface is a thiomethyl group.
5. The method according to claim 1, wherein the hydrogen bond-forming group or atom is at least one of pyridine nitrogen and amino group.
6. The method of claim 1, wherein the hydrogen bond-forming groups or atoms are pyridine nitrogen and amino groups.
7. The method of claim 1, wherein the heterocyclic assembly molecule is 2-amino-4-methylsulfanyl-pyridine.
8. The method of claim 1, wherein the gold nanorods have a length of 75.0±0.5 nm and a width of 18.5±0.3 nm.
9. The method of claim 1, wherein the molar ratio of gold nanorods to the heterocyclic assembly molecules in the dispersion is 1:2250000 to 1:3500000.
10. The method of claim 1, wherein the molar ratio of gold nanorods to the heterocyclic assembly molecules in the dispersion is 1:2500000.

Description

Preparation method of gold nanorod assembly Technical Field The invention belongs to the fields of material chemistry and molecular electronics, and particularly relates to a preparation method of a gold nanorod assembly. Background Currently, bottom-up self-assembly techniques have evolved into multi-scale technology systems covering atomic, molecular, and biological systems, whose application is expanding deeply from basic assembly to functional device fabrication. However, in the field of molecular electronics and the like where a precise electrode-molecule interface needs to be constructed, the electrode material needs to meet the dual stringent requirements of nanoscale feature size (to achieve atomic molecular contact) and surface chemical modifier (to support self-assembly precise regulation) at the same time. Gold nanorods become ideal electrode candidate materials by virtue of unique geometric anisotropy and excellent surface chemical activity. Nevertheless, the gold nanorod assembly which is stable in structure and suitable for high-yield molecular structure construction still faces significant challenges such as low yield, orientation bending and the like, the success rate of subsequent molecular device preparation is affected if the yield is low, and the orientation bending limits the alignment connection between the assembly and an external circuit and restricts the practical application of the assembly in molecular electronic devices. Disclosure of Invention Aiming at the problems in the prior art, the invention provides a preparation method of a gold nanorod assembly, which realizes the obtaining of the gold nanorod assembly with high yield and linear orientation by utilizing heterocyclic assembly molecules. The aim of the invention is achieved by the following technical scheme: the invention provides a preparation method of a gold nanorod assembly, which comprises the following steps: providing a dispersion comprising a plurality of gold nanorods in a liquid medium; Introducing into the dispersion a heterocyclic assembly molecule anchored to the gold nanorod surface, the heterocyclic assembly molecule comprising an aromatic heterocycle providing structural rigidity, a sulfur-containing anchoring group forming a coordination bond with the gold surface, and a group or atom capable of forming a hydrogen bond; The gold nanorod assembly comprises at least two gold nanorods and heterocyclic assembly molecules respectively positioned on each gold nanorod, wherein the two gold nanorods are mutually connected through at least two hydrogen bonds formed between complementary functional groups of the heterocyclic assembly molecules. In some embodiments, the aromatic heterocycle is a pyridine ring. In some embodiments, the sulfur-containing anchoring group that forms a coordination bond with the gold surface is at least one of a sulfhydryl group, a thiomethyl group. In some embodiments, the sulfur-containing anchor group that forms a coordination bond with the gold surface is a thiomethyl group. In some embodiments, the hydrogen bond-forming group or atom is at least one of pyridine nitrogen, amino. In some embodiments, the groups or atoms capable of forming hydrogen bonds are pyridine nitrogen and amino groups. In some embodiments, the heterocyclic assembly molecule is 2-amino-4-methylsulfanyl-pyridine. In some embodiments, the gold nanorods have a length of 75.0±0.5 nm and a width of 18.5±0.3 nm. In some embodiments, the molar ratio of gold nanorods to the heterocyclic assembly molecules in the dispersion is 1:2250000 to 1:3500000. In some embodiments, the molar ratio of gold nanorods to the heterocyclic assembly molecules in the dispersion is 1:2500000. Compared with the prior art, the invention has the following beneficial technical effects: According to the preparation method of the gold nanorod assembly, the assembling molecules used by the preparation method are used for enhancing the anchoring efficiency with gold by replacing the traditional sulfhydryl group with the more stable thiomethyl group, meanwhile, due to the directional hydrogen bonding effect of the aromatic heterocycle which is rigid in molecular structure and can form a hydrogen bond and pi-pi accumulation of the aromatic heterocycle, the efficient assembly of the assembly under the multi-mode synergistic effect is realized, the technical bottlenecks of low assembly yield, oriented bending and the like caused by bending of the traditional flexible alkyl chain hydrogen bond molecules due to conformational distribution are solved, and the gold nanorod assembly with high yield and linear orientation is obtained. Drawings FIG. 1 is a diagram of 1H NMR（CDCl3, 298, K) of 2-amino-4-methylsulfanyl-pyridine; FIG. 2 is a scanning electron microscope characterization graph (a, b), a gold nanorod ultraviolet absorption spectrum graph (c), and a gold nanorod size measurement graph (d-e) of the gold nanorod of example 1; FIG. 3 is a scanning elec