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Method for regulating and controlling morphology of nano-gold assembly through one-step method

A nano-gold, assembly technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as increasing the distance between particles, weakening the coupling effect between nanoparticles, and hindering the self-assembly process. , to achieve the effect of expanding prospects

Pending Publication Date: 2021-11-02
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, surfactants can increase the charge density on the surface of nanoparticles, which not only hinders the subsequent self-assembly process, but also increases the distance between particles, weakening the inter-nanoparticle coupling effect in the assembly.

Method used

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  • Method for regulating and controlling morphology of nano-gold assembly through one-step method
  • Method for regulating and controlling morphology of nano-gold assembly through one-step method
  • Method for regulating and controlling morphology of nano-gold assembly through one-step method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: pH is the nano-gold assembly under the condition of 5.2

[0034] Take a 25 ml beaker, add 20 ml of 1% chloroauric acid aqueous solution and a rotor, add NaOH solution to adjust the pH to 5.2, then add 3 ml of cyclohexanone, cover the beaker with plastic wrap, and stir with the rotor, forming a beaker at the interface. layer of gold nanoparticles, remove the plastic wrap, and after the cyclohexanone is completely volatilized, use a silicon wafer to transfer the nano-gold assembly. The electron microscope picture of described nano gold assembly body is as figure 1 As shown, it consists of nano-gold sheets, rods and balls.

Embodiment 2

[0035] Embodiment 2: pH is the nano-gold assembly film under the condition of 5.2

[0036] Take a 25 ml beaker, add 20 ml of 1% chloroauric acid aqueous solution and a rotor, add NaOH solution to adjust the pH to 5.2, then add 3 ml of cyclohexanone, cover the beaker with plastic wrap, and stir with the rotor, forming a beaker at the interface. layer of nano-gold particles, remove the plastic wrap, and when cyclohexanone volatilizes, slowly add polyurethane cyclohexanone solution. After cyclohexanone is completely volatilized, polyurethane forms a thin film to fix the nano-gold assembly, forming a flexible nano-gold assembly body film.

Embodiment 3

[0037]Embodiment 3: pH is the nanogold assembly under the condition of 6.5, 6.8, 7.0, 7.2

[0038] Take a 25 ml beaker, add 20 ml, 1% chloroauric acid aqueous solution and rotor, add NaOH solution to adjust pH to 6.5, 6.7, 7.0, 7.2 respectively, then add 3 ml cyclohexanone, cover the beaker with plastic wrap, The rotor is stirred, and a layer of gold nanoparticles is formed at the interface, the plastic wrap is removed, and the gold nanometer assembly is transferred out with a silicon wafer. Electron micrographs of nano-gold assemblies under the 4 kinds of pH conditions are as follows: figure 2 As shown, it is composed of satellite-structured gold nanoparticles (there are many small gold nanospheres on the surface of large gold nanospheres), and as the pH increases, the number of small gold nanospheres increases.

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Abstract

The invention relates to a method for regulating and controlling the morphology of a nano-gold assembly through a one-step method. The method for regulating and controlling the morphology of the nano-gold assembly through the one-step method comprises the following steps of S1, preparing a chloroauric acid aqueous solution, and regulating and controlling the pH value of the chloroauric acid aqueous solution; S2, adding a cyclohexanone solution above the chloroauric acid aqueous solution, and sealing with a preservative film to construct a cyclohexanone / water binary system; S3, slightly stirring the cyclohexanone / water binary system through a rotor; S4, forming a nano-gold particle assembly layer at a cyclohexanone / water interface; and S5, removing the preservative film, and taking out the nano-gold assembly after cyclohexanone is completely volatilized. According to the method, direct transformation from a chloroauric acid solution to the morphology-controllable nano-gold assembly is achieved, and surface activity is not used in the process. Therefore, the surfaces of the prepared assembly particles are cleaner, the distance between the particles is smaller, and the performance of the assembly is better.

Description

technical field [0001] The invention belongs to the field of self-assembly of nanomaterials, and specifically relates to a method for regulating the morphology of nano-gold assembly in one step. Background technique [0002] Compared with individual nanoparticles, assembled nanoparticles exhibit many novel or stronger properties due to interparticle coupling effects, which open up new avenues for fabricating functional materials with specific physical and chemical properties. In addition, nanoparticle assembly is also an important way to connect the nanoworld with the macroscopic world. [0003] The properties of nanoparticle assemblies are closely related to the morphology of individual nanoparticles and the spatial position between particles. Among them, the performance of a single nanoparticle is mainly determined by its size and shape, and the spatial position between particles mainly refers to the distance and orientation between particles. For example, gold nanoparti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B82Y30/00B82Y40/00B22F1/00
CPCB22F9/24B82Y40/00B82Y30/00
Inventor 钟鹭斌郑煜铭
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI