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A surface-enhanced Raman scattering substrate and its preparation method

A surface-enhanced Raman and substrate technology, applied in the direction of Raman scattering, material excitation analysis, etc., can solve the problems of poor repeatability and stability, low Raman scattering efficiency, low detection sensitivity, etc., to achieve good stability, surface Raman Strong Mann scattering effect and strong Raman enhancement effect

Active Publication Date: 2018-02-09
SHENZHEN INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the first aspect of the embodiment of the present invention provides a surface-enhanced Raman scattering substrate, which is used to solve the problem of low Raman scattering efficiency and detection sensitivity of rough metal structure substrates and nano-metal sol substrates in the prior art. Low, poor repeatability and stability

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  • A surface-enhanced Raman scattering substrate and its preparation method
  • A surface-enhanced Raman scattering substrate and its preparation method
  • A surface-enhanced Raman scattering substrate and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Add chloroauric acid (10mmol / L, 250μL), freshly prepared, cooled sodium borohydride (10mmol / L, 600μL) and cetyltrimethylammonium bromide (0.1mol / L, 9.75mL) to 25mL Place the beaker in an ice bath for 4 hours to prepare a brown gold nano-single crystal seed solution, the size of the gold nano-single crystal seed is 3~5nm;

[0041] HAuCl 4 (10mmol / L, 0.5mL), CTAB (0.1mol / L, 10mL), silver nitrate (10mmol / L, 100μL), hydrochloric acid (1.0mol / L, 200μL) after mixing, then add ascorbic acid (0.1mol / L, 55μL), after mixing, a mixed solution is obtained. When the mixed solution becomes colorless, under continuous stirring, add 12μL of the gold nano single crystal seed solution obtained above to the above mixed solution. Keep in a water bath at ℃ for 12 hours to obtain gold nanorod seed crystals. After washing twice with deionized water, re-dissolve the gold nanorod seed crystals into 1 mL of deionized water to obtain a gold nanorod seed crystal solution;

[0042] Under continuous sti...

Embodiment 2

[0051] Add chloroauric acid (10mmol / L, 250μL), freshly prepared, cooled sodium borohydride (10mmol / L, 600μL) and cetyltrimethylammonium bromide (0.1mol / L, 9.75mL) to 25mL Place the beaker in an ice bath for 4 hours to prepare a brown gold nano-single crystal seed solution, the size of the gold nano-single crystal seed is 3~5nm;

[0052] HAuCl 4 (10mmol / L, 0.5mL), CTAB (0.1mol / L, 10mL), silver nitrate (10mmol / L, 80μL), hydrochloric acid (1.0mol / L, 200μL) after mixing, then add ascorbic acid (0.1mol / L, 55μL), after mixing, the mixed solution is obtained. When the mixed solution becomes colorless, under continuous stirring, add 12μL of the obtained gold nano single crystal seed solution to the above mixed solution. Keep in a water bath at ℃ for 14 hours to obtain gold nanorod seed crystals. After washing 3 times with deionized water, re-dissolve the gold nanorod seed crystals in 1 mL of deionized water to obtain a gold nanorod seed crystal solution;

[0053] Under continuous stirring...

Embodiment 3

[0056] Add chloroauric acid (10mmol / L, 250μL), freshly prepared, cooled sodium borohydride (10mmol / L, 500μL), cetyltrimethylammonium bromide (0.1mol / L, 9.75mL) to 25mL In the beaker, then place the beaker in an ice bath for 6 hours to prepare a brown gold nano-single crystal seed solution, the size of the gold nano-single crystal seed is 3~5nm;

[0057] HAuCl 4 (10mmol / L, 0.5mL), CTAB (0.1mol / L, 10mL), silver nitrate (10mmol / L, 20μL), hydrochloric acid (1.0mol / L, 200μL) after mixing, then add ascorbic acid (0.1mol / L, 55μL), after mixing, a mixed solution is obtained. When the mixed solution becomes colorless, under continuous stirring, add 12μL of the gold nano single crystal seed solution obtained above to the above mixed solution. Keep in a water bath at ℃ for 12 hours to obtain gold nanorod seed crystals. After washing twice with deionized water, re-dissolve the gold nanorod seed crystals into 1 mL of deionized water to obtain a gold nanorod seed crystal solution;

[0058] Unde...

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Abstract

An embodiment of the present invention provides a surface-enhanced Raman scattering substrate, including a hydrophobic substrate and a plurality of gold nanoparticles attached to the hydrophobic substrate, the gold nanoparticles are in the shape of a cuboid, and the gold nanoparticles Each surface of the particle is concave, and the gold nanoparticles have eight tapered corners. The surface-enhanced Raman scattering substrate has good stability and strong Raman enhancement effect, which can make the detection concentration of dye molecules, aniline organic substances and other substances as low as <10-10mol / L, reaching the single-molecule detection level. The embodiment of the present invention also provides a preparation method of the surface-enhanced Raman scattering substrate, which has simple process and convenient operation.

Description

Technical field [0001] The invention relates to the technical field of nanomaterials and optics, in particular to a surface enhanced Raman scattering substrate and a preparation method thereof. Background technique [0002] Raman spectroscopy is a spectroscopic technique for studying molecular vibrational energy levels and can be widely used in the field of molecular recognition. However, ordinary Raman scattering signals are very weak and difficult to detect, which limits its application in actual production. Surface-enhanced Raman scattering (SERS) spectroscopy technology greatly enhances ordinary Raman signals by constructing a substrate with a special surface, thereby effectively detecting low-concentration molecules. It is a trace analysis technique with wide application potential. Since the surface enhanced Raman scattering effect was discovered in the 1970s, it has been widely used due to its good selectivity and high sensitivity. [0003] Experimental and theoretical stud...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/65B22F9/24
Inventor 张春阳张林飞
Owner SHENZHEN INST OF ADVANCED TECH
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