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SERS (Surface-Enhanced Raman Spectroscopy) substrate taking insoluble fiber as template and preparation method thereof

A soluble and fiber-based technology, applied in liquid chemical plating, coatings, instruments, etc., can solve the problems of lower detection limit, high cost of Raman scattering substrate, and inability to enrich, and achieve good uniformity

Inactive Publication Date: 2019-03-01
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above problems, the present invention aims at the shortcomings of high cost and inability to enrich the existing surface-enhanced Raman scattering substrates, and provides a SERS substrate with insoluble fibers as a template and a preparation method thereof. The method has higher sensitivity, especially Detect low-concentration target molecules in aqueous solution. Target molecules can be adsorbed on the surface of cellulose-nanosilver in a large amount of solution for enrichment, further reducing the detection limit, and has the advantages of good uniformity. At the same time, its preparation method Simple, can be used for low-concentration detection in fields such as pesticide residues and the environment

Method used

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  • SERS (Surface-Enhanced Raman Spectroscopy) substrate taking insoluble fiber as template and preparation method thereof
  • SERS (Surface-Enhanced Raman Spectroscopy) substrate taking insoluble fiber as template and preparation method thereof
  • SERS (Surface-Enhanced Raman Spectroscopy) substrate taking insoluble fiber as template and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Combine 15mL 0.2% (mass fraction, the same below) insoluble cellulose with 15mL concentration of 12*10 -3 mol / L AgNO 3 Mix in a Erlenmeyer flask, stir magnetically at room temperature for 20 minutes, turn on the heating switch, heat to boiling under stirring conditions, and when the color changes to orange and remains unchanged, take it out and cool to room temperature. Under vigorous stirring, add 4mL concentration of 1*10 - 3 mol / L hydroxylamine hydrochloride and 3.6mL concentration is 1*10 -3 The color of the mixed solution of mol / L sodium hydroxide solution turns gray-brown, and then slowly stir for 10 minutes to make it stable, and the SERS substrate is obtained.

Embodiment 2

[0033] Combine 15mL 0.15% (mass fraction, the same below) insoluble cellulose with 15mL concentration of 10*10 -3 mol / LAgNO 3 Mix in a Erlenmeyer flask, stir magnetically at room temperature for 20 minutes, turn on the heating switch, heat to boiling under stirring conditions, and when the color changes to orange and remains unchanged, take it out and cool to room temperature. Add 1mL of 20*10 dropwise under ice bath and vigorous stirring -3 mol / L, the color turns gray-brown, and then slowly stirred for 15 minutes to make it stable, and the SERS substrate was obtained.

Embodiment 3

[0035] Combine 15mL 0.2% (mass fraction, the same below) insoluble cellulose with 15mL concentration of 30*10 -3 mol / LAgNO 3 Mix it with an Erlenmeyer flask, stir magnetically at room temperature for 20 minutes, turn on the heating switch, heat to boiling under stirring, and when the color changes to orange and remains unchanged, take it out and cool to room temperature. Under vigorous stirring, add 7mL concentration of 1*10 - 3 mol / L hydroxylamine hydrochloride and 6mL concentration is 1*10 -3 The color of the mixed solution of mol / L sodium hydroxide solution turns gray-brown, and then slowly stir for 10 minutes to make it stable, and the SERS substrate is obtained.

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Abstract

The invention discloses an SERS (Surface-Enhanced Raman Spectroscopy) substrate taking insoluble fiber as a template and a preparation method thereof. The method comprises the following steps: mixingand stirring micro-nanoscale insoluble porous cellulose serving as a template with a silver nitrate solution of a certain concentration, so that silver particles are fully adsorbed on the surface of the cellulose; performing in-situ reduction on the sliver particles with reducing agents such as hydroxylamine hydrochloride and sodium borohydride to form cellulose-nano-silver to serve as the SERS substrate. When the SERS substrate is applied to the detection of malachite green, the SERS substrate has an adsorption effect on the malachite green, and has the effect of further lowering the detection limit of the malachite green. The prepared substrate has high uniformity, and an adsorption effect on target molecules. Meanwhile, the substrate has the best detection state for high-concentration and low-concentration target molecules during dynamic detection.

Description

technical field [0001] The invention belongs to the technical field of surface-enhanced Raman scattering, and in particular relates to a SERS substrate with an insoluble fiber as a template and a preparation method thereof. Background technique [0002] Malachite green is often used as a fungicide in aquaculture, but it has been banned due to its high residue, carcinogenic and teratogenic effects. However, due to its cheap price and good bactericidal properties, there are still some illegal use cases, so it is very important to detect malachite green in aquaculture products quickly and at low concentrations. [0003] Surface-enhanced Raman scattering (SERS) spectroscopy has attracted extensive attention and applied research due to the existence of the SERS substrate, which can detect trace substances, and has the characteristics of rapidity, non-destructiveness, and high sensitivity, and its enhancement factor has reached 10. 13 -10 15 . However, the raw materials for the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65C23C18/44
CPCC23C18/44G01N21/658
Inventor 吴长机先丽卢玉栋朱兰瑾沈慧英游文强
Owner FUJIAN NORMAL UNIV
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