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Surface processing method for surface enhanced Raman spectrum substrate material

A surface-enhanced Raman and substrate material technology, applied in Raman scattering, material excitation analysis, nanotechnology, etc., can solve the problems of complex operation steps, power consumption, strict operation requirements, etc., and achieve stable operation process and high dispersion , good stability effect

Active Publication Date: 2014-01-08
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Kauffmann, J.M. et al. (Kauffmann, J.M. et al. Electrochim. Acta 1998, 43, 3467–3473) found that the oxidation of hydrogen peroxide is too strong, which will make I - Totally removes and oxidizes the gold nanoparticle surface
Therefore, although this method is simple and practical, it can effectively remove I- on the surface of gold nanoparticles, but the surface of the final gold nanoparticles is covered with a layer of oxide, the substance to be tested cannot be effectively adsorbed on the oxide surface, and the Raman enhanced activity is still low. ; (2) Electrochemical oxidation method
ZQ Tian et al. (ZQ Tian et al. Anal. Chem. 2008, 80, 5118–5125) used electrochemical methods to oxidize I on the surface of gold nanoparticles - , the strongly adsorbed I - Converted to weakly adsorbed species such as IO3-, but the method is complicated in operation steps, needs to consume electric energy, and the operation requirements are strict, and the surface of the treated gold nanoparticles is easy to re-adsorb I - or use I - Fully culled without generating IO 3- and other weakly adsorbed species, resulting in the surface of gold nanoparticles being too clean for stable storage

Method used

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  • Surface processing method for surface enhanced Raman spectrum substrate material
  • Surface processing method for surface enhanced Raman spectrum substrate material
  • Surface processing method for surface enhanced Raman spectrum substrate material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Take a 50mL round-bottomed flask, add 19mL ultrapure water, 2mg chloroauric acid, 1mL sodium citrate aqueous solution (5mM) in sequence, and stir for 5-10min until a clear solution;

[0028] (2) Add 1mL sodium borohydride aqueous solution (0.1M);

[0029] (3) Stir at room temperature for 4 hours and then stand still, the resulting product is named A and stored at 4°C;

[0030] (4) Take a 500mL round bottom flask and add 300mL ultrapure water, 600mg chloroauric acid, 3g PVP and stir for 15-20min to a clear solution in sequence;

[0031] (5) Add potassium iodide (0.25M aqueous solution, 25mL), ascorbic acid (0.15M aqueous solution, 20mL), A (0.05mL) in sequence

[0032] (6) After stirring at room temperature for 15 minutes, let it stand, and the resulting product is named B;

[0033] (7) Add 0.001 mL of concentrated ammonia water (25% aqueous solution) to B, stir at room temperature for 30 minutes, and name the product C.

[0034] See the result figure 1 , figure 2 with image ...

Embodiment 2

[0036] (1) Follow the steps (1)-(6) of Example 1 to synthesize product B;

[0037] (2) Add 10 mL of concentrated ammonia (25% aqueous solution) to product B, and stir for 30 min at room temperature.

Embodiment 3

[0039] (1) Follow the steps (1)-(6) of Example 1 to synthesize product B;

[0040] (2) Add 0.001 mL of methylamine aqueous solution (25%) to product B, and stir at room temperature for 10 minutes.

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Abstract

The invention discloses a surface processing method for surface enhanced Raman spectrum substrate material. The surface processing method includes the following steps that (1), metal nano-particles and an appropriate amount of amine substances are mixed; (2), mixing is performed for appropriate time at appropriate temperature. The surface processing method is simple in technology, the cost and usage amount of the amine substances used for the processing method are low, and the surface processing method is stable in operation technology and good in repeatability.

Description

Technical field [0001] The present invention relates to the field of Raman spectroscopy detection, in particular to a surface treatment method for surface enhanced Raman spectroscopy substrate materials. Background technique [0002] Surface-enhanced Raman spectroscopy is a kind of spectroscopy technology for rapid detection of surface molecular structure of substances. Its main feature is that it can quickly obtain fingerprint information of trace substances in complex systems, and has the advantages of high sensitivity and high accuracy. Surface-enhanced Raman spectroscopy technology not only plays an important role in basic scientific research such as DNA detection, molecular adsorption behavior on electrode surface and bioimaging, but also in practical fields such as quality inspection, food safety, explosives, drugs, gems, and artwork identification. It is widely used. [0003] Commonly used surface-enhanced Raman spectroscopy active substrate materials are mainly gold or sil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00G01N21/65B82Y40/00
Inventor 郑南峰刘圣杰
Owner XIAMEN UNIV
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