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PDMS-Based (polydimethylsiloxane-based) surface-enhanced Raman spectrum substrate and preparation method thereof

A surface-enhanced Raman and sponge technology, applied in the field of Raman spectroscopy, can solve the problems of expensive TERS technology equipment, weak signal, complicated operation, etc., and achieve the effect of enhancing the enhancement effect, enhancing the binding force, and large specific surface area.

Inactive Publication Date: 2017-10-17
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For in situ SERS analysis technology, TERS technology equipment is extremely expensive, complicated to operate, and the signal is weak

Method used

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  • PDMS-Based (polydimethylsiloxane-based) surface-enhanced Raman spectrum substrate and preparation method thereof
  • PDMS-Based (polydimethylsiloxane-based) surface-enhanced Raman spectrum substrate and preparation method thereof
  • PDMS-Based (polydimethylsiloxane-based) surface-enhanced Raman spectrum substrate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Such as figure 1 The shown surface-enhanced Raman spectroscopy substrate based on PDMS sponge includes a support body 1 with three-dimensional mesh pores and a layer of metal particles 2 attached to the surface of the pores of the support body 1, and the support body 1 is In the PDMS sponge, the metal particles 2 are nanoparticles, specifically silver particles with a particle diameter of 50 nm.

[0044] A first intermediate layer 31 is also provided between the pore surface of the support body 1 and the metal particles 2, and the first intermediate layer 31 is composed of monomolecular APTMS.

[0045] The preparation method of the surface-enhanced Raman spectroscopy substrate based on PDMS sponge comprises the following steps:

[0046] 1) Preparation of support 1: First, add 2ml of p-xylene solvent and 4g of sugar to the mixture of polydimethylsiloxane and curing agent with a mass ratio of 7:1, and then bathe in water at 60°C for 14h to obtain PDMS Sponge precursor; ...

Embodiment 2

[0050] Such as Figure 4 The shown surface-enhanced Raman spectroscopy substrate based on PDMS sponge includes a support body 1 with three-dimensional mesh pores and two layers of metal particles 2 attached to the surface of the pores of the support body 1. The support body 1 is In the PDMS sponge, the metal particles 2 of the first layer and the metal particles 2 of the second layer are both silver particles with a particle diameter of 50 nm.

[0051] A first intermediate layer 31 is also provided between the pore surface of the support body 1 and the first layer of metal particles 2, and the first intermediate layer 31 is composed of monomolecular APTMS. A second intermediate layer 32 is provided between the first layer of metal particles 2 and the second layer of metal particles 2, and the second intermediate layer 32 is composed of mutually cross-linked APTMS.

[0052] The preparation method of the surface-enhanced Raman spectroscopy substrate based on PDMS sponge compris...

Embodiment 3

[0059] Compared with Example 2, the PDMS sponge-based surface-enhanced Raman spectroscopy substrate of this example has the difference that: both the first intermediate layer 31 and the second intermediate layer 32 are composed of single-molecule APTMS. When used for the first time, the use effect of the base of this embodiment is the same as that of the base of Example 2. However, after repeated use, under the conditions of the same concentration and the same analyte, the enhancement effect of the substrate of this embodiment on the characteristic peaks is obviously weakened, which may be caused by the shedding of some silver particles, which shows that the two methods of this embodiment The bonding force between two layers of metal particles 2 is significantly lower than that between two layers of metal particles 2 in Example 2.

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Abstract

The invention discloses a PDMS-based (polydimethylsiloxane-based) surface-enhanced Raman spectrum substrate, comprising metal particles and a support having three-dimensional mesh pores; the metal particles are attached to the pore surface of the support; the support is PDMS sponge. As the support has three-dimensional mesh structure and large specific surface area and can load more metal particles more evenly, enhancement effect of the substrate can be significantly improved, characteristic peaks, and particularly those at low wave number, of an analysis subject can be clearly tested; further, when the support is PDMS sponge, sampling can be more effectively and more quickly performed as the sponge is hydrophilic, both solid surface dirt and liquid pollutant dirt can be detected, the substrate is particularly suitable for detecting pesticides on the surface of vegetables and fruits and in vegetable and fruit juice; furthermore, the sponge is elastic and may deform correspondingly according to roughness of the surface of an object to be detected so as to better absorb the object to be adsorbed, and the substrate is a flexible substrate.

Description

technical field [0001] The invention relates to the technical field of Raman spectroscopy, in particular to a PDMS sponge-based surface-enhanced Raman spectroscopy substrate and a preparation method thereof. Background technique [0002] Surface Enhanced Raman Scattering (Surface Enhanced Raman Scattering, hereinafter referred to as SERS) technology is a vibrational spectroscopy analysis technology. The generation of SERS must rely on noble metal (usually Au, Ag, Cu, etc.) nanomaterials as signal-enhancing substrates in most cases. SERS not only has a fast analysis speed (from a few seconds to a few minutes), but also the analysis sensitivity can reach the single-molecule level. Traditional SERS substrates are mostly gold-silver nano-sols or rigid solid substrates based on gold-silver nanomaterials, and the sample solution needs to be collected and dropped on the SERS substrate before SERS analysis can be performed. Therefore, conventional SERS substrates are generally not...

Claims

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Application Information

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IPC IPC(8): G01N21/65C23C24/00
CPCC23C24/00G01N21/658
Inventor 范美坤龚正君孙姬
Owner SOUTHWEST JIAOTONG UNIV
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