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Gold nanoparticle-molybdenum disulfide-gold ultra-sensitive SERS substrate material and preparation method thereof

A technology of gold nanoparticles and molybdenum disulfide, which is applied in the field of detection, can solve the problems of complex operation, structural design defects, and the inability of SERS substrates to be widely used, and achieve the effects of good stability and simple preparation methods

Active Publication Date: 2018-01-19
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned structure has obtained a large enhanced SERS signal, the above-mentioned SERS substrate cannot be widely used due to defects in the design of the structure and complicated operation.

Method used

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  • Gold nanoparticle-molybdenum disulfide-gold ultra-sensitive SERS substrate material and preparation method thereof
  • Gold nanoparticle-molybdenum disulfide-gold ultra-sensitive SERS substrate material and preparation method thereof
  • Gold nanoparticle-molybdenum disulfide-gold ultra-sensitive SERS substrate material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Mix 200 μl of 50 mg / ml chloroauric acid solution with 100 ml of deionized water, heat to boiling, then add dropwise 700 μl of 1 wt% sodium citrate solution, and heat to 100° C. for 10 minutes to obtain a gold nanoparticle solution. Take 0.5g cysteine ​​and dissolve it in 100ml deionized water to obtain solution A. Dissolve 0.5 g of sodium molybdate in 100 ml of deionized water to obtain solution B. Solution A and solution B were mixed and sonicated for 2 hours at a volume ratio of 2:1 to obtain a molybdenum sulfide precursor solution. Take 40-80ml of gold nanoparticle solution, mix it with molybdenum sulfide precursor solution, and conduct a hydrothermal reaction at 200°C for 12 hours. After the reaction, the solution is centrifuged, washed, and dried for 24 hours to obtain a gold nanoparticle-molybdenum sulfide core-shell structure. nanomaterials. Gold nanoparticles-molybdenum disulfide core-shell nanomaterials are dispersed in ethanol, and about 200 μl of the soluti...

Embodiment 2

[0026] Mix 200 μl of 70 mg / ml chloroauric acid solution with 100 ml of deionized water, heat to boiling, then add dropwise 700 μl of 2wt% sodium citrate solution, and heat to 100° C. for 10 minutes to obtain a gold nanoparticle solution. Take 0.7g cysteine ​​and dissolve it in 100ml deionized water to obtain solution A. Take 0.7g of sodium molybdate and dissolve it in 100ml of deionized water to obtain solution B. Solution A and solution B were mixed and ultrasonicated for 2 hours at a volume ratio of 2:1, and 40-80ml of gold nanoparticle solution was added, mixed with the ultrasonic mixture of A and B above, and hydrothermally reacted at 200°C for 12 hours. After the reaction, the solution was centrifuged , cleaning, and drying for 24 hours, the gold nanoparticle-molybdenum sulfide core-shell nanomaterial can be obtained. Gold nanoparticles-molybdenum disulfide core-shell nanomaterials are dispersed in ethanol, and about 200 μl of the solution is spin-coated on a clean silic...

Embodiment 3

[0029] 200 μl of 80 mg / ml chloroauric acid solution and 100 ml of deionized water were mixed, heated to boiling, then 700 μl of 3 wt% sodium citrate solution was added dropwise, heated to 100° C. for 10 minutes to obtain a gold nanoparticle solution. Take 0.8g cysteine ​​and dissolve it in 100ml deionized water to obtain solution A. Dissolve 0.8g of sodium molybdate in 100ml of deionized water to obtain solution B. Solution A and solution B were mixed and ultrasonicated for 3 hours at a volume ratio of 2:1, and 40-80ml of gold nanoparticle solution was added, mixed with the ultrasonic mixture of A and B above, and hydrothermally reacted at 200°C for 12 hours. After the reaction, the solution was centrifuged , cleaning, and drying for 24 hours, the gold nanoparticle-molybdenum sulfide core-shell nanomaterial can be obtained. Gold nanoparticles-molybdenum disulfide core-shell nanomaterials are dispersed in ethanol, and about 200 μl of the solution is spin-coated on a clean sili...

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Abstract

The invention relates to a gold nanoparticle-molybdenum disulfide-gold ultra-sensitive SERS substrate material and a preparation method thereof. The structure is a gold nanoparticle / molybdenum disulfide / gold sandwich structure with the gold nanoparticle as a core, the molybdenum disulfide as a shell, and a layer of gold particles with a certain "hot sopt" effects evaporated on the surface of the core-shell structure in a vacuum mode. The molar ratio of the nano-material element is molybdenum: sulfur: gold being 1.0:1.9: 1.0. The chemical formula of molybdenum disulfide is MoS2. Compared with the prior art, the preparation method of the gold nanoparticle-molybdenum disulfide-gold ultra-sensitive SERS substrate material is convenient and fast. According to the gold nanoparticle-molybdenum disulfide-gold SERS substrate material, MoS2 serves as a supporting body to adsorb target molecules, a double-plasma coupling effect exists between the Au nano particles, the "hot spot" effect enhancedan SERS signal, the MoS2 is in bridge connection with the Au so as to realize the ultra-sensitive detection of rhodamine B molecules, the detection limit can reach 10-10 mol / L, and the repeatability and the stability of the rhodamine B is detected to be good.

Description

technical field [0001] The invention belongs to the technical field of detection, and relates to a gold nanoparticle-molybdenum disulfide-gold ultrasensitive SERS base material and a preparation method. Background technique [0002] Surface-enhanced Raman spectroscopy, also known as SERS, overcomes the shortcomings of low sensitivity of Raman spectroscopy and can achieve ultrasensitive detection of molecules. Noble metals such as gold, silver, and copper have good plasmonic enhancement effects, and are commonly used SERS substrate materials. It has always been a challenging research topic to select a suitable support body and construct a suitable substrate material structure to improve the sensitivity, stability and uniformity of SERS detection. At present, scientists have carried out a lot of work in the preparation of SERS substrate materials, and continue to expand its application range. For example, the construction of a substrate material combining copper nanoparticle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/02G01N21/65
Inventor 李炫华郭绍晖杨琳仝腾腾朱金萌
Owner NORTHWESTERN POLYTECHNICAL UNIV
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