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
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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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