Silver-gold porous nanorod array, preparation method and purpose of silver-gold porous nanorod array

A nanorod array and nanorod technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of electromagnetic field enhancement of porous gold nanorods, failure to synthesize products, thin gold film thickness, etc. problem, to achieve the effect of improving the overall SERS activity, improving the electromagnetic field enhancement, and ensuring stability

Inactive Publication Date: 2013-10-02
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, both the platinum-coated porous gold nanorod array and its synthesis process have shortcomings. First, although the product has excellent performance in the field of catalysis, it is greatly limited by the platinum coating. The key role played by the porous gold nanorod array in the SERS effect; secondly, the size of the porous gold nanorods in the product is too large, and the top of the rods is often bonded, which affects the generation of electromagnetic field enhancement between the porous gold nanorods ; Again, the thickness of the gold film supporting the porous gold nanorod array is relatively th

Method used

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  • Silver-gold porous nanorod array, preparation method and purpose of silver-gold porous nanorod array

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Experimental program
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Effect test

Embodiment 1

[0036] The concrete steps of preparation are:

[0037] Step 1, first place the aluminum oxide template coated with a gold film on one side in the mixed electrolyte, and electrodeposit it under a constant voltage direct current voltage of 0.2V for 10 minutes; wherein, the mixed electrolyte is electrolyzed by silver nitrate electrolyte and chloroauric acid The solution is mixed according to the ratio of gold ions and silver ions contained in the two at a ratio of 1:2 to obtain an alumina template with a gold film on one side and an array of gold-silver alloy nanorods deposited in the holes. Then put the aluminum oxide template with a gold film on one side and gold-silver alloy nanorod arrays deposited in the holes in a nitric acid solution with a concentration of 65wt% at 0°C for 10 minutes to obtain a gold film on one side and gold-silver alloy nanorod arrays in the holes. Alumina templates for gold porous nanorod arrays.

[0038] Step 2, first coating liquid methyl methacryla...

Embodiment 2

[0041] The concrete steps of preparation are:

[0042] Step 1, first place the aluminum oxide template coated with a gold film on one side in the mixed electrolyte, and electrodeposit it under a constant voltage direct current voltage of 0.35V for 7 minutes; wherein, the mixed electrolyte is electrolyzed by silver nitrate electrolyte and chloroauric acid The solution is mixed according to the ratio of gold ions and silver ions contained in the two at a ratio of 1:3 to obtain an alumina template with a gold film on one side and an array of gold-silver alloy nanorods deposited in the holes. Then put the aluminum oxide template with a gold film on one side and gold-silver alloy nanorod arrays deposited in the holes in a nitric acid solution with a concentration of 66wt% at 0.5°C for 7.5 minutes to obtain a gold film on one side and a gold-silver alloy nanorod array in the holes. Alumina template with gold porous nanorod arrays.

[0043] Step 2, first coating liquid methyl methac...

Embodiment 3

[0046] The concrete steps of preparation are:

[0047]Step 1, first place the aluminum oxide template coated with a gold film on one side in the mixed electrolyte, and electrodeposit it under a constant voltage direct current voltage of 0.5V for 5 minutes; wherein, the mixed electrolyte is electrolyzed by silver nitrate electrolyte and chloroauric acid The solution is mixed according to the ratio of gold ions and silver ions contained in the two at a ratio of 1:3.5 to obtain an alumina template with a gold film on one side and gold-silver alloy nanorod arrays deposited in the holes. Then put the aluminum oxide template with a gold film on one side and gold-silver alloy nanorod arrays deposited in the holes in a nitric acid solution with a concentration of 67wt% at 1°C for 5 minutes to obtain a gold film on one side and gold-silver alloy nanorod arrays in the holes. Alumina templates for gold porous nanorod arrays.

[0048] Step 2, first coating liquid methyl methacrylate on t...

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Abstract

The invention discloses a silver-gold porous nanorod array, a preparation method and a purpose of the silver-gold porous nanorod array. The array comprises porous gold nanorods coated with 3-15nm silver films and arranged on a methyl methacrylate substrate coated with a gold film, wherein the nanorods are 150-250nm in length, and 50-70nm in diameter; and holes are 5-20nm in diameter. The method comprises the steps of placing an aluminum oxide template coated with a gold film in a mixed electrolytic solution for electro-deposition, obtaining an aluminum oxide template coated with the gold film and provided with a gold-silver alloy nanorod array deposited in holes, placing the aluminum oxide template in a nitric acid solution for reaction to obtain an aluminum oxide template coated with the gold film and provided with a porous gold nanorod array in holes, coating the other side of the gold film with liquid methyl methacrylate, solidifying, then sequentially placing the aluminum oxide template in a silver nitrate electrolytic solution for the electro-deposition and aqueous alkali for removing the aluminum oxide template, or sequentially placing the aluminum oxide template in aqueous alkali for removing the aluminum oxide template, coating a silver film by an ion sputtering method, and obtaining the objective product. The array can serve as an SERS (Surface Enhanced Raman Scattering) activity substrate for detecting trace organic matters.

Description

technical field [0001] The invention relates to a nanorod array, its preparation method and application, in particular to a silver-gold porous nanorod array, its preparation method and application. Background technique [0002] In recent years, detection methods based on the nanostructured surface-enhanced Raman scattering (SERS) effect have attracted widespread attention because of their "fingerprint" recognition ability, high sensitivity, and ease of rapid detection. Theoretical and experimental studies have shown that the SERS effect mainly comes from the enhanced electromagnetic field generated between nanounits. The gaps between nano-units will generate a strong local coupling electric field, which is usually called "hot spot". Platinum Coated, Nanoporous Gold Nanorod Arrays: Synthesis and Characterization", Adv.Mater.2007, 19, 1612–1615 ("Synthesis and Characterization of Platinum Coated Porous Gold Nanorod Arrays", Journal of Advanced Materials, Volume 19, 2007 1612...

Claims

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Application Information

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IPC IPC(8): B22F1/00C25D7/04C25D5/02C23C14/16G01N21/65B82Y30/00B82Y40/00
CPCG01N21/658
Inventor 陈斌孟国文黄竹林许巧玲朱储红钱益武
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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