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SERS substrate based on paper fiber substrate and preparation method thereof

A technology of fiber substrate and paper fiber, which is applied in the field of excitonic nanophotonics and optical sensing, can solve the problems of limited, complicated and uneven preparation process, and achieve the advantages of simple preparation method, low cost and reduced preparation cost Effect

Pending Publication Date: 2019-09-27
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The SERS enhancement effect of the two-dimensional metal nanostructure prepared on the flat substrate is limited compared with the three-dimensional structure plasmon and SERS enhancement effect, and there are problems such as planarization, templating, inhomogeneity, and complicated preparation process.

Method used

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  • SERS substrate based on paper fiber substrate and preparation method thereof
  • SERS substrate based on paper fiber substrate and preparation method thereof
  • SERS substrate based on paper fiber substrate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1: Realization of different paper fiber SERS substrates

[0042] Add an aqueous solution of chloroauric acid to the toluene solution in which tetraoctylammonium bromide is dissolved, and stir. Wherein tetraoctyl ammonium bromide quality is 1.5g, and toluene solvent volume is 80ml, and chloroauric acid quality is 0.32g, and the volume of water is 2ml, then adds 20ml sodium borohydride aqueous solution to above-mentioned mixed solution, and its concentration is 0.37mol / 1, stop stirring after 5min, and chemical reaction finishes; Wherein, the mass ratio of each reactant Tetraoctyl ammonium bromide, chloroauric acid, sodium borohydride is 12:1:9; The organic phase is removed by vacuum distillation to obtain a black viscous liquid containing gold nanoparticles; methanol is added to the black viscous liquid, and the gold nanoparticles settle, and then the solvent is removed, and the remaining solvent between the particles is evaporated to dryness to obtain Gold nano...

Embodiment 2

[0043] Example 2: Effect of concentration of gold nanoparticle suspension on Raman enhancement performance of paper fiber SERS substrate

[0044]With reference to example 1, the ethanol suspension liquid that concentration is 10mg / mL, 15mg / mL, 30mg / mL, 50mg / mL gold nanoparticle is drop-coated on filter paper, forms four test areas on fiber paper, and gold nanoparticle in different areas SERS substrates with different particle area coverage. The sample was placed on a heating plate at a temperature of 110°C, and after the solvent evaporated to dryness, a paper fiber SERS substrate was prepared, such as Figure 9 (a)-(d), the particle surface density is about 10%, 15%, 30%, and 50% of the projected coverage area ratio respectively. Set the concentration to 10 -3 The mol / L rhodamine 6G alcohol solution was drip-coated on the above four substrates, and the Raman signal was excited by a 785nm excitation light source to obtain an enhanced Raman spectrum. The output power of excit...

Embodiment 3

[0045] Example 3: Raman enhanced performance of paper fiber SERS substrates with different concentrations of rhodamine 6G

[0046] Prepare gold nanoparticles with reference to Example 1, the volume concentration of the configuration substance is 120ml of ethanol suspension of gold nanoparticles of 15mg / mL and it is drip-coated on three parts of filter paper respectively (each part of filter quality corresponds to 40ul, that is, three parts of filter paper The substrates are the same), and the sample is placed on a heating plate at a temperature of 110 °C, and the paper fiber SERS substrate is prepared after the solvent is evaporated to dryness. Set the concentration to 10 - 4 mol / L, 10 -5 mol / L, 10 -6 The mol / L rhodamine 6G ethanol solution was drop-coated on the filter paper respectively, and a 785nm excitation light source was used to excite the Raman signal, and the laser power was set to 100mW and the integration time was 1s. The obtained Raman-enhanced spectra of diffe...

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Abstract

The invention relates to a SERS substrate based on a paper fiber substrate and a preparation method thereof, and belongs to the technical field of isoexciton nano-photonics and optical sensing. The gold nanoparticles coated with tetraoctyl ammonium bromide are adhered on the surface of paper fiber substrate to form a detection region. The particle size of gold nanoparticles is 100-160nm. A gap is formed between the gold nanoparticles in the detection region. According to the gold nanoparticle colloids coated with tetraoctyl ammonium bromide prepared based on the common paper fibers and the conventional chemical method and the low temperature heat treatment process, the photophysical properties, the SERS performance and the detection sensitivity can reach the current level of high-end preparation technology at present.

Description

technical field [0001] The invention belongs to the technical field of plasmon nanophotonics and optical sensing. A simple and easy method of assembling metal nanoparticles on paper fibers to realize SERS substrate is proposed for trace detection of substances. Background technique [0002] Raman scattering is inelastic scattering, and the frequency shift of Raman scattering light relative to the incident light has nothing to do with the frequency of the incident light, but corresponds to the vibration and rotation information of molecular characteristics. Therefore, Raman spectroscopy can reveal the structure of substances, and can identify and identify substances. However, due to the weak intensity of scattered light, the identification and detection of trace substances face great challenges. [0003] SERS has high sensitivity, and its advantage lies in its electromagnetic enhancement and chemical enhancement performance, which is a good surface optical sensing technolog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65B82Y30/00B22F1/00B22F9/24
CPCG01N21/658B82Y30/00B22F9/24B22F1/102B22F1/054
Inventor 张新平穆云云
Owner BEIJING UNIV OF TECH
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