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Method for assembling differently charged metal nanoparticles onto surface of substrate in bidirectional and controllable manner

A technology of metal nanoparticles and gold nanoparticles, which is applied in the direction of nanotechnology, nanotechnology, nanostructure manufacturing, etc., can solve problems such as difficulty in meeting ever-changing needs, and achieve a two-way and controllable effect of the process

Inactive Publication Date: 2019-04-23
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, the existing charged substrate surface is often only charged with one kind of charge, such as a positively charged substrate surface or a negatively charged substrate surface, and then self-assembles with the corresponding metal nanoparticles, which is difficult to meet the increasing changes in practical applications. need

Method used

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  • Method for assembling differently charged metal nanoparticles onto surface of substrate in bidirectional and controllable manner
  • Method for assembling differently charged metal nanoparticles onto surface of substrate in bidirectional and controllable manner
  • Method for assembling differently charged metal nanoparticles onto surface of substrate in bidirectional and controllable manner

Examples

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Embodiment 1

[0026] This embodiment provides a method for two-way controllable self-assembly of metal nanoparticles with different charges on the surface of a substrate, which includes the following steps:

[0027] (a) Take the silicon wafer and place it in a beaker, ultrasonicate it for 8 minutes in the order of acetone, ethanol and deionized water; then put it into Piranha solution (a mixture of concentrated sulfuric acid and 30% hydrogen peroxide, the volume ratio is 7:3) 30 min for surface hydroxylation treatment, rinse with deionized water and dry after taking it out; immerse in a mixed solution of 3-aminopropyltriethoxysilane, ethanol and water (3-aminopropyltriethoxy The volume ratio of silane, ethanol and water is 1:98:1), let it stand overnight to modify the surface with positively charged functional groups to obtain the first modified substrate, and then ultrasonically wash it with deionized water for 3~5 times and dry it for later use; as a comparison , also adjusted the volume ...

Embodiment 2

[0032] This example provides a method for two-way controllable self-assembly of metal nanoparticles with different charges on the surface of the substrate, which is basically the same as that in Example 1, except that in step (b), 2 h, its SEM image is as follows image 3 (e) shown.

Embodiment 3

[0034] This example provides a method for two-way controllable self-assembly of metal nanoparticles with different charges on the surface of the substrate, which is basically the same as that in Example 1, except that in step (b), succinic anhydride acetone solution is added for 3 h , its SEM image is shown in image 3 (g) shown.

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Abstract

The invention relates to a method for assembling differently charged metal nanoparticles onto the surface of a substrate in a bidirectional and controllable manner. The method comprises the followingsteps of (a) placing the substrate into Piranha solution for surface hydroxylation, and washing and then immersing the surface-hydroxylated substrate into a mixed solution of 3-aminopropyl triethoxysilane, ethanol and water for surface positive charge functional group modification to obtain a first modified substrate, wherein the volume ratio of 3-aminopropyl triethoxysilane, ethanol and water inthe mixed solution is 1:50-150:0.5-5; (b) immersing the first modified substrate into succinic anhydride acetone solution for reaction to obtain a second modified substrate; (c) immersing the second modified substrate into metal nanoparticle solutions with different surface charge properties for self-assembly, then extracting, washing and blow-drying the immersed second modified substrate. Therefore, the method for assembling the differently charged metal nanoparticles onto the surface of the substrate in the bidirectional and controllable manner achieves self-assembly of differently charged metal nanoparticles and ensures a bidirectional and controllable process.

Description

technical field [0001] The invention belongs to the field of nanomaterials and relates to a self-assembly method, in particular to a method for bidirectionally controllable self-assembly of metal nanoparticles with different charges on the surface of a substrate. Background technique [0002] In recent years, the emergence and improper development of nano-optics have rapidly driven people's research and interest in metal nanostructures. Metal nanostructures have a unique collective electronic oscillation behavior, which is often called the surface plasmon resonance (SPR) of metal nanostructures. The plasmon resonance properties of metal nanostructures are closely related to the specific structure of metal nanostructures, including the size of metal nanoparticles, the shape of metal nanoparticles and the spacing between metal nanoparticles. In addition to changes in the properties of the metal nanoparticles themselves that change the plasmon resonance properties of the metal...

Claims

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Application Information

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IPC IPC(8): B82B3/00
CPCB82B3/0061
Inventor 江林钟留彪王雅雯李东孙迎辉
Owner SUZHOU UNIV
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