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Au nano dendrites surface-reinforced Raman scattering substrate and preparation method thereof

A surface-enhanced Raman and dendrite technology, applied in Raman scattering, measuring devices, instruments, etc., can solve problems such as complex steps and expensive experimental equipment, and achieve reliable signals, low cost, and uniform appearance

Inactive Publication Date: 2016-09-28
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although there are many advantages of the template method, this method involves many complicated steps and expensive experimental equipment

Method used

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  • Au nano dendrites surface-reinforced Raman scattering substrate and preparation method thereof
  • Au nano dendrites surface-reinforced Raman scattering substrate and preparation method thereof
  • Au nano dendrites surface-reinforced Raman scattering substrate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1 A method for preparing an Au nanodendritic surface-enhanced Raman scattering substrate, comprising the following steps:

[0041] A. The preparation of the Au spin-coated ZnO nanorod array substrate produced on the ITO conductive glass includes the following steps: (1) Pre-deposit a film thickness of about 15 mm on the ITO substrate by atomic layer (ALD) deposition. -25 nm ZnO seed layer to obtain a ZnO seed layer substrate; (2) the substrate of the ZnO seed layer produced on the ITO conductive glass prepared in step (1) is used as a working electrode, zinc nitrate hexahydrate and hexamethylene The mixed solution of base tetramine is used as the electrolyte, and the ZnO nanorod array is controlledly electrodeposited on the surface of the ZnO seed layer by the constant current electrodeposition method. The concentration of the mixed solution is 25mM. In the mixed solution, zinc nitrate hexahydrate and hexamethylene The molar ratio of base tetramine is 1:1; (3) A...

Embodiment 2

[0044] A, is identical with the A step of embodiment 1;

[0045] B. Add 80ml HAuCl to 100ml electrolyzer 4 (0.5g L -1 ) solution as the electrolyte, insert the Au spin-coated ZnO nanorod array substrate produced on the ITO conductive glass prepared in step A into the electrolytic cell, as the working electrode, the effective part immersed in the electrolyte is 2.5 cm×0.8 cm, Using the graphite sheet as the counter electrode, turn on the reverse working current and adjust it to 1mA. Au nanodendrites grow on the surface of the Au spin-coated ZnO nanorod array substrate. After 1.5 h, the current is turned off, and the Au spinners are rinsed with alcohol and water in turn. The coated ZnO nanorod array substrate was dried to obtain a SERS active substrate.

[0046] The above-mentioned active substrate with a SERS effect on the surface is used as a Raman detection substrate, and R6G is used as a probe molecule, and the Raman detection is performed according to the method in Exampl...

Embodiment 3

[0048] A, is identical with the A step of embodiment 1;

[0049] B. Add 80ml HAuCl to 100ml electrolyzer 4 (0.5g L -1 ) solution as the electrolyte, insert the Au spin-coated ZnO nanorod array substrate produced on the ITO conductive glass prepared in step A into the electrolytic cell, as the working electrode, the effective part immersed in the electrolyte is 2.5 cm×0.8 cm, A graphite sheet was used as the counter electrode. Turn on the reverse working current and adjust it to 2 mA, Au nanodendrites grow on the surface of the Au spin-coated ZnO nanorod array substrate, turn off the current after 1 h, wash the Au spin-coated ZnO nanorod array with alcohol and water in turn The substrate was dried to obtain a SERS active substrate.

[0050] The above-mentioned active substrate with a SERS effect on the surface is used as a Raman detection substrate, and R6G is used as a probe molecule, and the Raman detection is performed according to the method in Example 1, and the charact...

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Abstract

The invention discloses an Au nano dendrites surface-reinforced Raman scattering substrate and a preparation method thereof. The SERS active substrate is a layered micro nano structure composited by precious metal Au and a semiconductor ZnO. The preparation method employs a two-step constant current deposition method, an Au spin-coated ZnO nano rod array substrate generated on an ITO electro-conductive glass is taken as a work electrode, graphite flake is taken as a counter electrode, the Au nano dendrites can be produced. The active substrate is formed by a main part (the Au nano rod) hollow structure and a lim Au dendrite. The method has the advantages of simple process, low cost, small current, and low voltage, the Au dendrite can be transferred to a silicon chip substrate; the substrate obtained in the invention has the advantages of high stability, and ordered and controllable structure, and has high stability in the Raman spectroscopy detection.

Description

technical field [0001] The invention belongs to the technical field of laser Raman detection and nanomaterials, and specifically relates to an Au nanodendritic surface-enhanced Raman scattering (SERS) substrate and a preparation method thereof. The active substrate is a layered hierarchical micro-nano structure array . Background technique [0002] Due to the weak signal and poor effect of ordinary Raman scattering, if the scattering effect is changed by increasing the laser intensity, it may cause certain damage to the sample and side effects such as photobleaching. If the surface adsorbed substances are detected or the concentration of the detected molecules is low, the conventional Raman detection is insufficient, so other auxiliary enhancement methods are needed. Therefore, Surface Enhanced Raman Scattering Spectroscopy (SERS) emerged as a means of Raman enhancement. SERS technology originates from the adsorption of trace molecules on Au, Ag, Cu and other noble metals a...

Claims

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Application Information

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IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 张海宝王化田兴友陈林李潇潇刘研研宁俊锟
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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