Surface enhanced raman spectrum printing test paper for field test and preparation method thereof

A surface-enhanced Raman and on-site detection technology, which is applied in the field of sensitive detection and analysis, to improve the effect, improve the rapidity and stability, and ensure the effect of repeatability and stability

Active Publication Date: 2013-05-22
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007]At present, because the surface of the paper SERS substrate has a micron structure and its roughness is large, the noble metal nanoparticles are only deposited or printed by simple physical methods, resulting in a detection signal Unstable and poor signal repeatability; it will also greatly enhance the Raman signal of the paper itself, which interferes with the Raman signal of the molecule to be tested and is not suitable for on-site detection. The present invention provides a surface enhancement for on-site detection. Raman spectrum printing test paper ensures the repeatability and stability of SERS detection signal and improves the detection effect of SERS

Method used

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  • Surface enhanced raman spectrum printing test paper for field test and preparation method thereof
  • Surface enhanced raman spectrum printing test paper for field test and preparation method thereof
  • Surface enhanced raman spectrum printing test paper for field test and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] (2) Place the paper covered with silicon dioxide after the treatment in (1) in a mixture of 3-aminopropyltrimethoxysilane (APTMS) and ethanol with a volume ratio of 1:200, and take it out after 30 minutes Dried paper base;

[0082] (3) heating the gold aqueous solution to boiling, and then adding a 1% sodium citrate aqueous solution to react to prepare monodisperse gold nanoparticles;

[0083] (4) Centrifuge the gold nanoparticles in (3) at 5000 rpm, pour off 95% of the supernatant, and then add 3 mL of glycerol per 10 mL to adjust its viscosity and surface tension to obtain nano Silver ink; and use 0.1mm microporous PTFE membrane to remove large particles in the ink.

[0084] (5) Put the nano-gold ink in (4) in the inkjet printer cartridge, apply the piezoelectric principle to drive the nano-gold ink to print on the paper substrate in (2), and get the surface-enhanced Raman spectroscopy (SERS) printing test paper .

[0085] Embodiment 2: A preparation method of a su...

Embodiment 2

[0087] (2) Put the paper covered with titanium dioxide after the treatment in (1) in the mixed solution of 3-(tritylmercapto)propionic acid and ethanol with a volume ratio of 1:1000, take it out after 10 minutes and dry it to obtain paper substrate;

[0088] (3) heating the aqueous solution of silver to boiling, and then adding a 1% sodium citrate aqueous solution to react to obtain monodisperse silver nanoparticles;

[0089] (4) Centrifuge the silver nanoparticles in (3) at 5000 rpm, pour off 95% of the supernatant, and then add 1mL of glycerin per 10mL to adjust its viscosity and surface tension to obtain silver nanoparticles Ink: use 0.1mm microporous PTFE membrane to remove large particles in the ink.

[0090] (5) Put the nano-silver ink in (4) in the inkjet printer cartridge, apply the piezoelectric principle to drive the nano-silver ink to print on the paper substrate in (2), and get the surface-enhanced Raman spectroscopy (SERS) printing test paper .

[0091] Example...

Embodiment 3

[0093] Since the preparation of the SERS paper substrate is achieved by printing, common printing paper, filter paper, filter membrane and photographic paper (corresponding to figure 1 a, b, c, d in). It can be seen from the figure that the surface of these papers is composed of tens of micron fiber structures or units of several microns.

[0094] (2) Synthesis and selection of silica nanospheres

[0095] Silica is a non-toxic, odorless, non-polluting non-metallic material, and has the characteristics of optical transparency, non-Raman activity, and biocompatibility. The precursor used in this experiment is TEOS, with NH 3 As the catalyst and ethanol as the solvent, first mix TEOS and an appropriate amount of ethanol into a 500mL three-necked conical round-bottomed flask with a ground stopper, and stir for 3min with a magnetic stirrer at a fixed speed of 500 rpm to make TEOS and ethanol Mix well; also mix appropriate amount of deionized water and ammonia water, and stir at...

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Abstract

The invention provides a surface enhanced raman spectrum printing test paper for field test, a preparation method thereof and application for field test of pesticide residue, explosive, cordial, environmental pollutants, illegal additives and the like. The surface enhanced raman spectrum printing test paper has high reproductibility and hyperstability. Polyhydroxy compounds on the surface of the paper and inorganic nanometer oxidized granules of non-raman active substances are utilized for weak interaction, upper functional groups are modified on an inorganic nanometer oxide through a chemical method, so that noble metal nanometer granules can be captured and fixed actively by the groups, and the nanometer oxide plays a role of leveling and covering the paper signals so as to guarantee the repeatability and stability of the detection of SERS(surface enhanced raman spectroscopy). Rapid detection on raman signals is improved, the detection range is enlarged, and the surface enhanced raman spectrum printing test paper is suitable for detection of materials in three states, namely, solid, liquid and gas.

Description

technical field [0001] The invention belongs to the technical field of sensitive detection and analysis, and in particular relates to a high-reproducibility, ultra-stable surface-enhanced Raman spectrum printing test paper and a preparation method thereof, and its effects on pesticide residues, explosives, stimulants, and the environment. Applications for on-site detection of pollutants and illegal additives, etc. [0002] Background technique: [0003] Surface-enhanced Raman spectroscopy (SERS) technology is an important means of trace analysis and detection. It can only enhance the target molecule or group in an extremely complex system to obtain simple and clear spectral information, and the enhancement factor can reach 10. 14 -10 15 , enabling single-molecule detection. After decades of rapid development, various explorations have been made in the preparation of SERS substrates around chemical and physical methods, and many gratifying achievements have been made. Ho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
Inventor 杨良保刘洪林刘锦淮田中群
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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