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Simple preparation method of Ag-Au composite nanometer periodic structure with high SERS activity

A periodic structure and nanotechnology, applied in the field of nanomaterials, can solve problems such as lack of universality, and achieve stable and reliable SERS performance

Pending Publication Date: 2020-04-21
NANTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology has strong operability and high controllability, and the signal uniformity and batch reproducibility have been greatly enhanced. However, due to the limitation of the template size, obtaining a nano-gap or nano-tip with high SERS activity usually requires high-end precision equipment, not universal

Method used

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  • Simple preparation method of Ag-Au composite nanometer periodic structure with high SERS activity
  • Simple preparation method of Ag-Au composite nanometer periodic structure with high SERS activity
  • Simple preparation method of Ag-Au composite nanometer periodic structure with high SERS activity

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preparation example Construction

[0028] The invention provides a simple preparation method of an Ag-Au composite nano-periodic structure with high SERS activity, comprising the following steps:

[0029] Step 1, depositing a layer of silver film on the channel surface of the single-pass anodized aluminum template;

[0030] Step 2, forming discontinuous silver nanoparticles on the bottom of the channel and the walls of the pores through the high-temperature confined spheroidization process of the metal film to obtain a template-based silver nanoparticle array substrate;

[0031] Step 3, immersing the template-based silver nanoparticle array substrate obtained in step 2 in a gold ion solution for different times to obtain an Ag-Au composite nano-periodic structure;

[0032] Step 4, soak the Ag-Au composite nano-periodic structure obtained in step 3 in different molecular solutions to be tested, take it out after 30 minutes, rinse with ultrapure water, and blow dry with nitrogen to obtain the sample to be tested....

Embodiment 1

[0038] In this example, a single-pass anodic alumina template with a pore diameter of 450 nm and a pore depth of 500 nm was selected to prepare an initial silver nanoparticle array. The thickness of the silver film deposition was 35 nm, the spheroidization temperature was 400 ° C, and the spheroidization time was 2 hours. After 5 minutes of substitution reaction, Ag was obtained. -Au composite nanoperiodic structures.

[0039] Specific steps are as follows:

[0040]First, a 35nm silver film is deposited on the channel surface of the single-pass anodized aluminum template, and then discontinuous silver nanoparticles are formed on the bottom and wall of the channel through a high-temperature confined spheroidization process to obtain a template-based silver nanoparticle array substrate ; The obtained template-based silver nanoparticle array substrate was soaked in the gold ion solution for 5 minutes to react. After taking it out, it was washed with ultrapure water and dried by e...

Embodiment 2

[0042] The difference between this embodiment 2 and embodiment 1 is that the substitution reaction time is 15min, and the concentration of the four kinds of detection molecules is 10 -6 M.

[0043] Specific steps are as follows:

[0044] First, a 35nm silver film is deposited on the channel surface of the single-pass anodized aluminum template, and then discontinuous silver nanoparticles are formed on the bottom and wall of the channel through a high-temperature confined spheroidization process to obtain a template-based silver nanoparticle array substrate ; Soak the obtained template-based silver nanoparticle array substrate in the gold ion solution for 15 minutes to react, take it out, wash it with ultrapure water, and dry it with electric heat to obtain the Ag-Au composite nano-periodic structure; finally, the prepared Ag- After 30 days of preservation, the Au composite nano-periodic structure was soaked in different concentrations of 6-Mercaptopurine (6-MP) and methylene ...

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Abstract

The invention belongs to the technical field of nano materials, and discloses a simple preparation method of an Ag-Au composite nano periodic structure with high SERS activity. The simple preparationmethod comprises the following steps that a layer of silver film is evaporated on the surface of a single-pass anodic aluminum oxide template pore channel, and the silver film forms silver nanoparticles which are uniformly distributed in the pore channel through a high-temperature confinement spheroidizing process; and a substitution reaction is carried out by using Au<1> solution to obtain the Ag-Au composite nano periodic structure for SERS activity detection of various probe molecules. Compared with the prior art, the method has the advantages that the problem of poor repeatability of SERSsignals of traditional nano-particle colloid is solved, controllable preparation as well as SERS high-repeatability and high-activity detection of the large-area Ag-Au composite nano periodic structure are realized, the preparation cost of the periodic nano structure is greatly reduced, and the method is suitable for batch production.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a simple preparation method for an Ag-Au composite nano-periodic structure with high SERS activity. Background technique [0002] Surface-enhanced Raman scattering (Surface-enhanced Raman scattering, SERS) refers to the phenomenon that when the measured molecules are adsorbed on the rough metal surface, the Raman scattering signal is amplified abnormally. This technology is an emerging surface detection technology developed on the basis of Raman spectroscopy, and has now reached the level of single-molecule detection. In addition to relying on the accuracy of the instrument, the improvement of the detection level of SERS also requires the preparation of a detection substrate with high sensitivity and good repeatability. The research results show that the activity of the SERS substrate mainly comes from the enhancement of the electromagnetic field on the surface of the subs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/30C23C14/18C23C14/58B22F9/24B22F1/00G01N21/65
CPCC23C14/30C23C14/18C23C14/58B22F9/24G01N21/658B22F1/054
Inventor 方靖淮吴静
Owner NANTONG UNIVERSITY
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