Method for detecting VOC gas by MOF-coated gold nanoparticle enhanced Raman spectroscopy

A Raman spectroscopic detection, gold nanoparticle technology, applied in Raman scattering, measurement devices, material analysis by optical means, etc., can solve the problem of SERS activity decline, etc. Simple, reproducible results

Inactive Publication Date: 2021-04-30
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It should also be pointed out that these reports mainly focus on the Ag substrate, and Ag is very easy to be oxidized, which leads to a rapid decline in its SERS activity.

Method used

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  • Method for detecting VOC gas by MOF-coated gold nanoparticle enhanced Raman spectroscopy
  • Method for detecting VOC gas by MOF-coated gold nanoparticle enhanced Raman spectroscopy
  • Method for detecting VOC gas by MOF-coated gold nanoparticle enhanced Raman spectroscopy

Examples

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Embodiment 1

[0036] In this embodiment, Au@ZIF-8 nanoparticles are taken as an example for illustration.

[0037] Such as figure 1 Shown is a schematic flow chart for the preparation of Au@ZIF-8 nanoparticles with different structures. The specific preparation method is as follows:

[0038] 1. Preparation of 55nm Au nanoparticles: take 200mL HAuCl with a mass fraction of 0.01% 4 Add the aqueous solution into a 250mL round-bottomed flask, heat it to boiling under stirring, take 1.5mL of sodium citrate aqueous solution with a mass fraction of 1% with a pipette gun and add it to the reaction solution, the reaction color gradually turns from transparent to black and finally turns to soil Yellow color, continue to heat for 30 minutes, wait for complete reaction and cool down to room temperature naturally, the resulting solution is 55nm Au nano sol. Take 40mL of 55nm Au solution, add 20mL of 2.5% polyvinylpyrrolidone (PVP) aqueous solution with a molecular weight of 5500, and mix overnight to...

Embodiment 2

[0047] In this example, Au@MIL-100 nanoparticles are taken as an example for illustration, and the specific preparation method of nanoparticles is as follows:

[0048] 1. Adopt the method for sodium citrate to reduce chloroauric acid in Example 1 to obtain 55nm Au sol, take out 30ml of 55nmAu solution, add 3ml 1*10^(-8) thioglycolic acid solution, evenly divide into three parts, mix overnight, that is A sol of 55 nm Au particles modified with thioglycolic acid can be obtained.

[0049] 2. Preparation of Au@MIL-100 nanoparticle sol. Put 3 parts of thioglycolic acid-modified Au solutions into three round-bottomed flasks by centrifugal concentration, put them in a 70°C water bath, and add 3, 6, and 9 mL of 0.1mM FeCl respectively 3 Then add 3, 6, 9 mL of 0.1mM trimesic acid ethanol solution, shake evenly, take out after continuing to water bath for 30 minutes, quench in ice bath, and end the reaction process, you can get different shells For Au@MIL-100 core-shell nanoparticles ...

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Abstract

The invention discloses a method for detecting VOC gas by MOF-coated gold nanoparticle enhanced Raman spectroscopy, and relates to the field of surface enhanced Raman spectroscopy detection. The preparation method comprises the following steps: 1) preparing high-dispersion Au nanoparticle sol with a surface plasmon resonance effect; (2) adjusting the amount of the added metal organic framework compound precursor in the high-dispersion Au nanoparticle sol prepared in the step (1), controlling the reaction time and temperature, and ending the reaction process in an ice bath shock cooling mode to obtain uniform and extremely-thin thickness-adjustable Au nanoparticle sol Au@(MOF) coated with the metal organic framework compound; and (3) preparing the Au@MOF nanoparticle sol obtained in the step (2) into a detection chip, and directly carrying out SERS detection on different VOCs gases with low concentrations. The preparation method is simple, the synthetic raw materials are simple, the particle size of the core gold and the thickness of the shell MOF material are controllable and adjustable, and very small nano gaps can be formed among particles, so that a very strong SERS coupling effect is generated.

Description

technical field [0001] The invention relates to the field of surface-enhanced Raman spectroscopy detection, in particular to a method for detecting VOC gas by enhanced Raman spectroscopy of MOF-coated gold nanoparticles. Background technique [0002] Surface-enhanced Raman spectroscopy (SERS), as a non-destructive, fast and ultra-sensitive molecular detection technique, is widely used in analysis, catalysis, sensing and other fields. Generally speaking, molecules need to be close to the plasma surface (<5nm) to greatly enhance their own Raman signal. Molecules are generally adsorbed on the surface of metal nanoparticle substrates (Au, Ag, Cu, etc.) through chemical or physical interactions. Its surface plasmon resonance effect (SPR) enables good molecular SERS signals to be obtained under excitation light of a specific wavelength. However, for some molecules, especially VOC (volatile organic compound) gases, it is difficult to interact with the SERS substrate, so it is e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 李剑锋陈清奇张华
Owner XIAMEN UNIV
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