Transparent flexible surface enhanced Raman active substrate and preparation method thereof

A flexible surface, Raman active technology, applied in Raman scattering, material excitation analysis, etc., can solve the problems of time-consuming and complex process, and achieve the effect of simple process, controllable structure and uniform morphology

Inactive Publication Date: 2015-04-08
ANHUI NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most SERS substrates are hard and opaque. It is generally necessary to use a solvent to extract the substance to be tested from the surface of the object to be detected, and then drop it on the SERS substrate for detection. The whole process is complicated and time-consuming.

Method used

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  • Transparent flexible surface enhanced Raman active substrate and preparation method thereof
  • Transparent flexible surface enhanced Raman active substrate and preparation method thereof

Examples

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Embodiment 1

[0020] Example 1: In this example, a nanowire array is prepared on a PET substrate, and Ag nanoparticles are loaded on the surface of the nanowire by coating technology, and the -4 M's rhodamine (R6G) was used as a probe molecule for the surface-enhanced Raman spectroscopy test. The specific process is as follows:

[0021] 1) Preparation of nanowire arrays: A PET plastic film with a thickness of about 200 μm of a certain size is placed flat on the substrate plate of the plasma chamber, and the substrate plate is water-cooled. After pre-evacuation, then pass high-purity O 2 , the flow rate is 20–100 sccm, and the air pressure in the control chamber is less than 10 Pa. Turn on the RF power to start etching, the RF power is 100–200W, the etching time is 5–20 min, and a nanowire array is produced on the PET surface;

[0022] 2) Ag nanoparticle loading: transfer the PET plastic film after plasma etching to the thermal evaporation chamber, and pre-evacuate to 10 -5 Pa, turn on th...

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Abstract

The invention discloses a transparent flexible surface enhanced Raman active substrate and a preparation method thereof. The preparation method of the substrate comprises the following steps: taking a transparent flexible material such as polybutylene terephthalate (PET) plastics as a substrate, performing O2 plasma etching to form a nano wire array, loading gold, silver and other precious metal nanoparticles on the nano wire surface by virtue of a coating technology, and forming a three-dimensional nanometer structure array. The transparent flexible surface enhanced Raman active substrate provided by the invention is uniform in morphology and controllable in structure and has high-density electromagnetic hot spots in three-dimensional distribution. Therefore, the substrate has high sensitivity and reproducibility. The PET plastic film is high in flexibility and high in transparency, and incident laser and Raman scattered light easily penetrate through the substrate at low loss, so that the substrate can be used for in-situ detection of to-be-detected objects. The preparation method provided by the invention is simple in process, large-area preparation is easily realized, even roll-to-roll production process is permitted, and the cost is low.

Description

technical field [0001] The invention relates to a transparent flexible surface-enhanced Raman active substrate and a preparation method thereof, in particular to a surface-enhanced Raman active substrate based on a noble metal-loaded nanowire three-dimensional structure array and a preparation method thereof. Background technique [0002] Surface-enhanced Raman spectroscopy (SERS) utilizes the surface-enhanced Raman scattering effect of the substrate, which greatly enhances the detection sensitivity of Raman spectroscopy, and can provide rich structural information of analytes through non-destructive testing. In the detection of quantitative analytes, it has great application potential in biochemistry, environmental chemistry, biophysics and molecular biology. The high sensitivity of SERS depends on the enhancement effect of the SERS substrate, which mainly comes from the electromagnetic field enhancement localized in the metal nanogap, that is, the electromagnetic hotspot. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
Inventor 左则文朱凯
Owner ANHUI NORMAL UNIV
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