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SERS substrate based on novel composite material, and preparation method thereof

A technology of composite materials and substrates, applied in the field of SERS substrates based on new composite materials and its preparation, can solve the problems of shedding and escape, low signal intensity of analytes, etc.

Pending Publication Date: 2022-02-25
FOSHAN WATER GRP GAOMING WATER SUPPLY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Odor substances, as volatile organic substances, are adsorbed by the precious metal substrate, and because the system is open, they are easy to fall off and escape from the surface of the material, resulting in low analyte signal intensity

Method used

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  • SERS substrate based on novel composite material, and preparation method thereof
  • SERS substrate based on novel composite material, and preparation method thereof
  • SERS substrate based on novel composite material, and preparation method thereof

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Embodiment 1

[0032] Embodiment 1: The preparation method of the SERS substrate based on novel composite material

[0033] The SERS substrate based on the novel composite material was prepared as follows:

[0034] S1: Preparation of Au@Ag core-shell nanoparticles, including the following steps:

[0035] S1a: Au nanoparticles (Au NPs) were prepared by the citrate reduction method: first, 950 μL of 5 g / L HAuCl was added to 60 mL of distilled water 4 4H 2 O aqueous solution, put the solution in a 120°C water bath, heat it to boiling under stirring conditions, and then quickly add 500 μL of 1% trisodium citrate solution. Stop heating when the color of the solution turns into a stable wine red, and cool to room temperature for later use.

[0036]S1b: Take 6 mL of Au NPs, add 120 μL of 1% trisodium citrate solution, and shake for 10 min. Add 320 μL of 10 mM ascorbic acid solution, and then slowly drop in 320 μL of 10 mM silver nitrate solution under shaking conditions. Continue to shake for ...

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Abstract

The invention discloses a preparation method of an SERS substrate based on a novel composite material. The preparation method comprises the following steps: S1, synthesizing Au@Ag NPs with a core-shell structure; S2, synthesizing Ag NPs; S3, synthesizing Ag NPs@CoNi-LDH; S4, synthesizing AgNPs@CoNi-LDH@GO: dispersing the Ag NPs@CoNi-LDH prepared in step S3 into ethanol, adding 2 mg / mL of graphene oxide dispersion liquid, heating the mixed solution in a water bath at 60 DEG C, violently stirring for 2 hours, centrifuging, collecting precipitate, washing with ethanol, and re-dispersing in ethanol to obtain ethanol dispersion liquid of the Ag NPs@CoNi-LDH@GO; and S5, preparing the SERS substrate: dispensing the Au@Ag NPs ethanol dispersion liquid prepared in step S1 on a mold, performing air drying, dispensing a layer of Ag NPs@CoNi-LDH@GO ethanol dispersion liquid prepared in step S4, and taking down the mold after natural air drying, thereby obtaining the SERS substrate. The SERS substrate prepared by the preparation method is high in adsorption capacity and can be used for simultaneously and rapidly detecting dimethyl sulfide and 2, 4-di-tert-butylphenol.

Description

technical field [0001] The invention belongs to the field of odor substance detection, and in particular relates to a SERS substrate based on a novel composite material and a preparation method thereof. Background technique [0002] Smell is a common problem in freshwater lakes around the world. Solving the problem of unpleasant taste and smell in water is an important issue that the world is paying attention to and striving to achieve. Among the many smelling substances, geosmin and 2-methylisoborneol are the most widely studied objects. Volatile organic compounds such as β-cyclic citral, phenols and thioethers have also received more and more attention in recent years. The current detection methods for these chemical substances mainly include sensory evaluation by trained analysts, gas chromatography coupled with mass spectrometry (GC-MS) and other methods. The sensory evaluation method needs to invest a lot of time and energy in advance to train specialized personnel, a...

Claims

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Application Information

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IPC IPC(8): B01J20/281B01J20/30G01N21/65
CPCB01J20/281G01N21/658
Inventor 谭智恒梁晓燕谭日新邓俊杰何巧儿
Owner FOSHAN WATER GRP GAOMING WATER SUPPLY CO LTD
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