Metal surface enhanced Raman scattering substrate with three-dimensional period structure and preparation method thereof

A technology that enhances Raman scattering and metal surfaces, applied in Raman scattering, material excitation analysis, etc., can solve the problems of complicated process, poor flexibility, easy to break, etc., and achieve simple and fast preparation process, high detection sensitivity, and signal Responsive even effect

Inactive Publication Date: 2012-03-21
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, the bottom-up method is based on the chemical synthesis of nanoparticles such as gold and silver. Although this method is simple and easy to synthesize, it has great disadvantages.
Specifically include: 1. The SERS substrate prepared by using the nanoparticles synthesized by the solution method, in fact, only a small part of the particles have SERS activity, and other nanoparticles cover the surface of the substrate to inhibit the SERS detection effect
2. It is difficult to control the aggregation effect of nanoparticles prepared from solution, which will inevitably affect the stability and repeatability of SERS detection results
Third, it is particularly important that the method for controlling the synthesis of stable nano-SERS active hotspots is still immature, that is to say, the control of synthesizing nanostructures with specific morphology still has a certain degree of randomness
Similarly, this substrate also has three disadvantages: 1. It is difficult to completely control the substrate with such a large surface area technically, which may lead to inconsistent surface morphology between different batches of substrates
Second, because it can only be synthesized on a two-dimensional plane, the space utilization rate is not high
3. Usually this kind of substrate has poor mechanical properties, especially poor flexibility and easy to break
On the one hand, this kind of technology is complex and costly; on the other hand, it is difficult to realize the metal surface enhanced Raman substrate with three-dimensional ordered structure.

Method used

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  • Metal surface enhanced Raman scattering substrate with three-dimensional period structure and preparation method thereof
  • Metal surface enhanced Raman scattering substrate with three-dimensional period structure and preparation method thereof
  • Metal surface enhanced Raman scattering substrate with three-dimensional period structure and preparation method thereof

Examples

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Effect test

Embodiment 1

[0029] Select the natural Pteropus spp. as a template, immerse it in 8%-20% dilute nitric acid for 1-5 hours, then dry it, then immerse it in 5%-50% ethylenediamine for 6-24 hours, and then put it in 1-10 ×10 -4 M HAuCl 4 Solution 2-10 hours, alcohol cleaning, then put into 1-5% NaBH 4 2-10 minutes in solution. Rinse and dry. Then it is further put into the electroless silver plating solution with potassium sodium tartrate as the reducing agent for electroless silver plating, and the metalized butterfly wings are further taken out under the optical microscope to place a single scale on a clean silicon wafer, then drop phosphoric acid on the scale, soak 72 hours, then rinsed with deionized water, and then dried in vacuum to obtain a metal Ag surface-enhanced Raman scattering substrate with a three-dimensional periodic structure (see figure 1 ).

[0030] The metal Ag surface-enhanced Raman scattering substrate with the three-dimensional periodic structure obtained above was ...

Embodiment 2

[0032]Select the natural Pteropus spp. as a template, immerse it in 8%-20% dilute nitric acid for 1-5 hours, then dry it, then immerse it in 5%-50% ethylenediamine for 6-24 hours, and then put it in 1-10 ×10 -4 M HAuCl 4 Solution 2-10 hours, alcohol cleaning, then put into 1-5% NaBH 4 2-10 minutes in solution. Rinse and dry. Then it is further put into an electroless gold plating solution with tartaric acid as a reducing agent for electroless gold plating. Further, a single scale of the metallized butterfly wing was taken out under an optical microscope and placed on a clean silicon wafer, and then phosphoric acid was dropped on the scale, soaked for 72 hours, then washed with deionized water, and then dried in a vacuum to obtain a three-dimensional periodic structure. Metallic Au surface-enhanced Raman scattering substrate (see figure 2 ).

[0033] The metal Au surface-enhanced Raman scattering substrate with a three-dimensional periodic structure obtained above was use...

Embodiment 3

[0035] Select the natural Pteropus spp. as a template, immerse it in 8%-20% dilute nitric acid for 1-5 hours, then dry it, then immerse it in 5%-50% ethylenediamine for 6-24 hours, and then put it in 1-10 ×10 -4 M HAuCl 4 Solution 2-10 hours, alcohol cleaning, then put into 1-5% NaBH 4 2-10 minutes in solution. Rinse and dry. Then it is further put into an electroless copper plating solution with formaldehyde as a reducing agent for electroless copper plating. Further, a single scale of the metallized butterfly wing was taken out under an optical microscope and placed on a clean silicon wafer, and then phosphoric acid was dropped on the scale, soaked for 72 hours, then washed with deionized water, and then dried in a vacuum to obtain a three-dimensional periodic structure. Metallic Cu surface-enhanced Raman scattering substrate (see image 3 ).

[0036] The metal Cu surface-enhanced Raman scattering substrate with the three-dimensional periodic structure obtained above wa...

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Abstract

The invention relates to a metal surface enhanced Raman scattering substrate with a three-dimensional period structure and a preparation method thereof and belongs to a chemical detection technology. The preparation method comprises the following steps of: soaking an amine-modified bio-template into a chloroauric acid solution so that catalyzed metal ions are introduced; then carrying out chemical plating treatment on activated sodium borohydride to obtain a metalized bio-template; and finally, carrying the metal ions on the metalized bio-template so as to obtain the metal surface enhanced Raman scattering substrate. The metal surface enhanced Raman scattering substrate prepared by the preparation method, provided by the invention, carries on and copies the three-dimensional period structure of a natural organism. The technology is simple and flexible and the cost is low. The obtained three-dimensional period metal substrate has higher surface enhanced Raman effects, can be used for effectively enhancing Raman signals, and has the advantages of uniform signal response and good repeatability.

Description

technical field [0001] The invention relates to a material and method in the technical field of chemical detection, in particular to a metal surface-enhanced Raman scattering substrate with a three-dimensional periodic structure based on natural butterfly wings as a template and a preparation method thereof. Background technique [0002] In 1974, Fleischmann et al. obtained high-quality surface Raman spectra of pyridine on electrochemically rough micro-nano-structured Ag electrodes. In 1977, Van Duyne and Creighton et al. systematically studied the same system, and after excluding the factors of increasing molecular concentration and resonance effects, they pointed out that the enhancement of 5-6 orders of magnitude came from a surface enhancement effect related to the rough electrode surface. That year, after the announcement of this discovery, it aroused widespread interest in the scientific community, and named this phenomenon Surface Enhanced Raman Scattering (Surface En...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65C23C18/44C23C18/40
Inventor 张荻顾佳俊谭勇文
Owner SHANGHAI JIAO TONG UNIV
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