Flexible erasable SERS (surface-enhanced Raman scattering) active substrate and preparation method thereof

A substrate and flexible support technology, applied in the field of SERS substrates, can solve the problems of low detection ability, inability to complex explosive molecules, and inability to detect explosives, etc., and achieve the effects of short sampling time and simple sampling steps.

Inactive Publication Date: 2015-08-19
CHENGDU SCI & TECH DEV CENT CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned substrates all have the disadvantages of low detection ability or inability to detect explosives.
This is due to the limitations of the above-mentioned substrates in terms of the amount of metal nanoparticles adsorbed, and the explosive molecules cannot be directly complexed with metal nanoparticles, so the above-mentioned substrates cannot detect explosives.

Method used

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  • Flexible erasable SERS (surface-enhanced Raman scattering) active substrate and preparation method thereof
  • Flexible erasable SERS (surface-enhanced Raman scattering) active substrate and preparation method thereof
  • Flexible erasable SERS (surface-enhanced Raman scattering) active substrate and preparation method thereof

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preparation example Construction

[0033] More specifically, the method for preparing a flexible and wipeable surface-enhanced Raman substrate of the present invention includes the following steps:

[0034](1) At least one of polyacrylamide, polyvinyl alcohol and chitosan is selected as the basic raw material, and the raw material is dissolved to obtain an aqueous solution. If chitosan is used, an aqueous acetic acid solution can be used for dissolution. During the dissolution process, proper heating can be used to promote the dissolution rate and dissolution rate of the raw materials. The completely dissolved solution is frozen at a temperature below -20°C for 4 to 24 hours to completely freeze the water in it into ice. The completely frozen raw materials are placed in a freeze dryer for vacuum freeze-drying treatment for 4-96 hours, preferably freeze-dried for 24-72 hours, to prepare a flexible support material (flexible support layer) with a porous structure.

[0035] (102) Put the above-mentioned flexible ...

Embodiment 1

[0044] Preparation of flexible nano-gold surface-enhanced Raman substrates:

[0045] 1) Preparation of flexible support layer with porous structure

[0046] Dissolve polyvinyl alcohol powder in an aqueous solution, heat and stir in a water bath until completely dissolved, and obtain a polyvinyl alcohol solution with a mass fraction of 8%. Weigh an appropriate amount of polyvinyl alcohol solution into a plastic disc, slowly add 4% borax aqueous solution dropwise and keep stirring, and place the polyvinyl alcohol solution in a -20°C refrigerator to freeze after it forms a gel state 4 hours. After the completely frozen polyvinyl alcohol was placed in a freeze dryer for 24 hours, a flexible support material with a porous structure was prepared. Put the flexible support layer with porous structure into deionized water for 30 minutes and ultrasonically clean it until the pH of the aqueous solution is ≈7, take out the flexible support layer with porous structure, and set aside. Th...

Embodiment 2

[0055] Preparation of flexible silver nanosphere surface-enhanced Raman substrate:

[0056] 1) Preparation of flexible support layer with porous structure

[0057] The chitosan powder was dissolved in an aqueous solution, placed in a water bath, heated and stirred until completely dissolved, and a chitosan solution with a mass fraction of 3% was prepared. Weigh an appropriate amount of chitosan solution and put it into a plastic disc, then place it in a refrigerator at -20°C for 12 hours. The fully frozen chitosan was put into a freeze dryer for 48 hours, and then a flexible support material with a porous structure was prepared. Put the flexible support layer with porous structure into deionized water for 10 minutes and ultrasonically clean it until the pH of the aqueous solution is ≈7, take out the flexible support layer with porous structure, and set aside.

[0058] 2) Preparation of silver nanosphere solution

[0059] Weigh 0.2 g of silver nitrate solid and dissolve it i...

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Abstract

The invention discloses an SERS (surface-enhanced Raman scattering) substrate comprising a flexible supporting layer and a metal nano-film which is adhered to the flexible supporting layer, wherein the flexible supporting layer is a flexible material with a porous structure, and the metal nano-film is subjected to surface modification treatment. According to a prepared flexible porous SERS substrate for wipe sampling, disclosed by the invention, a surface-enhanced Raman substrate can be used for rapidly detecting organic chemical substances particularly 2,4,6-trinitrotoluene on the surfaces of solid materials.

Description

technical field [0001] The invention relates to a substrate material for surface-enhanced Raman detection (SERS), in particular to a SERS substrate for realizing rapid detection of trace substances on a solid surface. The SERS substrate of the invention can be used for rapid detection of trace explosives on solid surfaces, and has high sensitivity and high reproducibility. Background technique [0002] In recent years, with the continuous occurrence of terrorist violence, mass incidents and the use of high-tech explosive devices and other factors, the international and domestic security situation has become increasingly severe. Especially the hidden explosives in the luggage of passengers in public places seriously threaten the life safety of passengers. How to quickly detect whether passengers carry or have been in contact with explosives during the security check process has become an urgent problem to be solved. [0003] Surface Enhanced Raman Scattering (Surface Enhanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
Inventor 王聪唐昶宇王群梅军刘焕明
Owner CHENGDU SCI & TECH DEV CENT CHINA ACAD OF ENG PHYSICS
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