Preparation method of flexible SERS substrate, prepared substrate and application thereof

A substrate and flexible technology, applied in the field of preparation of flexible SERS substrates, can solve the problems of time-consuming and laborious, loss of SERS activity, complex loading technology, etc., and achieve the effect of improving the convenience of use and good SERS performance

Pending Publication Date: 2021-03-09
NORTHWEST UNIVERSITY FOR NATIONALITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that in the prior art, the expensive metal nanoparticles loaded on the carbon fiber cloth are easy to be oxidized in the air and lose the SERS activity. At the same time, the loading technology is relatively complicated, time-consuming and laborious.

Method used

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  • Preparation method of flexible SERS substrate, prepared substrate and application thereof
  • Preparation method of flexible SERS substrate, prepared substrate and application thereof
  • Preparation method of flexible SERS substrate, prepared substrate and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0050] The preparation method of flexible SERS substrate, comprises the following steps:

[0051] (1) Preliminary oxidation of carbon cloth

[0052]Measure 36mL concentrated sulfuric acid (mass fraction 98%) and 4mL concentrated phosphoric acid (mass fraction 85%) into a 100mL clean and dry beaker, and preheat the beaker to 50°C with a water bath; take a piece with a size of 2.5× 4cm 2 , carbon with a mass of 22mg is placed in the above mixed acid, and 1.8g KMnO is slowly added to the beaker 4 , and continue heating at 50°C for 6 hours to complete the preliminary oxidation of the carbon cloth.

[0053] (2) Deep oxidation of carbon cloth

[0054] After completing step (1), slowly add concentration to the reaction system and be 30% H 2 o 2 , until the reaction system no longer produces bubbles;

[0055] (3) cleaning carbon cloth

[0056] After the reaction in step (2) is completed and cooled to room temperature, the carbon cloth is taken out, washed with distilled water, ...

Embodiment 2

[0073] The preparation method of flexible SERS substrate, comprises the following steps:

[0074] (1) Preliminary oxidation of carbon cloth

[0075] Measure 100mL of concentrated nitric acid (69%) into a 300mL clean and dry beaker, and preheat the beaker to 90°C with a water bath; take a piece with a size of 5×5cm 2 , Carbon with a mass of 55 mg is placed in the above acid, and 4.5 g of potassium perchlorate (KClO 4 ) and heated at 90°C for 8 hours to complete the preliminary oxidation of the carbon cloth.

[0076] (2) Deep oxidation of carbon cloth

[0077] After completing step (1), slowly add 30% H to the reaction system 2 o 2 , until the reaction system no longer produces bubbles;

[0078] (3) cleaning carbon cloth

[0079] After the reaction in step (2) is completed and cooled to room temperature, the carbon cloth is taken out, washed with distilled water, and dried to obtain a flexible carbon oxide cloth. The characterization of the flexible oxidized carbon cloth ...

Embodiment 3

[0081] The preparation method of flexible SERS substrate, comprises the following steps:

[0082] (1) Preliminary oxidation of carbon cloth

[0083] Measure 200mL perchloric acid into a 500mL clean and dry beaker, and preheat the beaker to 70°C with a water bath; take a piece with a size of 6×8cm 2 , Carbon with a mass of 1.056g is placed in the above acid, and 9gNaMnO is slowly added to the beaker 4 And heated at 70°C for 3 hours to complete the preliminary oxidation of the carbon cloth.

[0084] (2) Deep oxidation of carbon cloth

[0085] After completing step (1), slowly add 30% H to the reaction system 2 o 2 , until the reaction system no longer produces bubbles.

[0086] (3) cleaning carbon cloth

[0087] After the reaction in step (2) is completed and cooled to room temperature, the carbon cloth is taken out, washed with distilled water, and dried to obtain a flexible carbon oxide cloth. The characterization of the flexible oxidized carbon cloth prepared in this e...

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Abstract

The invention discloses a preparation method of a flexible SERS (Surface Enhanced Raman Scattering) substrate, and relates to the technical field of surface enhanced Raman scattering. The preparationmethod comprises steps of (1) primarily oxidizing a carbon cloth; (2) deeply oxidizing the carbon cloth: adding hydrogen peroxide into the reaction system in the step (1) until no bubbles are generated in the reaction system, and cooling to room temperature; and (3) taking out the carbon oxide cloth, cleaning and drying to obtain the flexible SERS substrate. The invention also provides the flexible SERS substrate prepared by the preparation method and application of the flexible SERS substrate in trace detection of organic matters. The preparation method has the beneficial effects that noble metal nanoparticles do not need to be loaded on the carbon cloth, and the commercial carbon cloth is oxidized by adopting a simple oxidation method, so that rich oxygen-containing functional groups aregenerated on the surface of the commercial carbon cloth. By utilizing the charge transfer property between the surface functional group and the organic matter and the foldability of the carbon cloth,the SERS substrate which is flexible and convenient to use is formed.

Description

technical field [0001] The invention relates to the technical field of surface-enhanced Raman scattering, in particular to a method for preparing a flexible SERS substrate, the prepared substrate and applications thereof. Background technique [0002] The surface-enhanced Raman scattering (SERS) effect has an important application in the field of trace detection of organic pollutants. However, at present, the substrates with SERS performance are mainly derivatives and structures based on Au, Ag, Cu and graphene, and their preparation methods are complicated and expensive. In addition, these materials are generally used as SERS substrates in powder form, such as The patent publication No. CN 102978629A discloses the preparation and application of Mo / Ag layered metal matrix composites as SERS substrates. The morphology of the Ag coating of Mo / Ag layered metal matrix composites is an island structure, and the composition of the coating is Ag. Due to the lack of flexibility, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 孟淑娟张平苏琼孙万虹
Owner NORTHWEST UNIVERSITY FOR NATIONALITIES
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