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Method for preparing macro-size closely-packed gold nanoparticle monolayer film

A gold nanoparticle and close-packed technology, which is applied in the direction of nanotechnology, can solve the problems of limited quantitative detection, gold nanoparticle monolayer film does not have Raman signal, no good self-assembly method, etc., and achieves the effect of simple operation

Active Publication Date: 2018-09-14
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As-prepared gold nanoparticle monolayers do not have uniform Raman signals, limiting their quantitative detection in the Raman-enhanced field
Also, there are no good self-assembly methods for larger sizes of 30-150 nm

Method used

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  • Method for preparing macro-size closely-packed gold nanoparticle monolayer film
  • Method for preparing macro-size closely-packed gold nanoparticle monolayer film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Sodium citrate and chloroauric acid were prepared into sodium citrate solution with 1% mass percent concentration and 1% chloroauric acid solution with mass percent concentration by using ultrapure water.

[0043] At the same time, use an oily solvent (one of toluene, hexane, pentanol or heptanol) to configure the amines (one of octadecylamine, octadecylamine or quaternary ammonium salt) to a molar concentration of 0.0001 mol / liter amine-containing oily solution.

[0044] Weigh 1.5 ml of sodium citrate solution and 0.5 ml of chloroauric acid solution in a ratio of 3:1 by volume.

[0045] The two-necked flask is fixed on the heating platform and adds 48 milliliters of ultrapure water (the volume ratio of chloroauric acid solution, sodium citrate solution and ultrapure water is 1:3:96), rapidly heated to reflux at 100 degrees Celsius; Add 1 ml of chloroauric acid solution into boiling water; then add 1.5 ml of sodium citrate solution into boiling water containing chloroa...

Embodiment 2

[0049] Using ultrapure water, the required raw materials tris and chloroauric acid are formulated into solutions respectively, wherein the molar concentration of the tris solution is 0.1 mol / liter, and the mass percent concentration of the chloroauric acid solution is 1 %; Use oily solvent (one in toluene, hexane, pentanol, heptanol etc.) simultaneously to configure amines (one in octadecylamine, octadecylamine, quaternary ammonium salt, etc.) into a molar concentration of 0.001 mol / L oily solution containing amines.

[0050] Weigh 2 ml of Tris solution, 0.5 ml of chloroauric acid solution and 10 ml of the 16nm gold nanoparticle sol in Example 1 according to the volume ratio of 4:1:20.

[0051] The two-necked flask was fixed on the heating platform and added 37.5 ml of ultrapure water (the volume ratio of tris solution, chloroauric acid solution, 16 nanometer gold nanosol and ultrapure water was 4:1:20 :75), rapidly heated to reflux at 100 degrees Celsius; 0.5 milliliters of ...

Embodiment 3

[0055] The difference between this embodiment and Example 2 is that the consumption of ultrapure water and 16 nanometer gold nano-sol is 46 milliliters and 1.5 milliliters, so that tris solution, chloroauric acid solution, 16 nanometer gold nano-sol The volume ratio to ultrapure water is 4:1:3:92 (2ml, 0.5ml, 1.5ml and 46ml). The molar concentration of the amine-containing oily solution is configured to be 0.05 mol / liter.

[0056] Take by weighing 5 milliliters of above-mentioned gold nanoparticle sols and 2 milliliters of amine-containing oily solutions respectively by the volume ratio of gold nanoparticle sol and amine-containing oily solution 5:2, make it mix completely,

[0057] All the other conditions are the same as in Example 2, and the single-particle size can be obtained as a macro-sized close-packed single-layer film of gold nanoparticles with a size of 60 nanometers, and its transmission electron microscope photo is as follows figure 1 shown.

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Abstract

Disclosed is a method for preparing a macro-size closely-packed gold nanoparticle monolayer film. The method comprises the steps that firstly, amines are configured into an amine-containing oily solution with the molar concentration being 0.0001-0.1 mol / L through an oily solvent; then 16-nanometer gold nanoparticles are used as seeds, and gold nanoparticle sol with the size range being 30-150 nanometers is prepared through a seed growing method; then the gold nanoparticle sol and the amine-containing oily solution are fully mixed with the volume ratio being 5:(1-3), still standing is conducted, and after an upper layer oil phase fully volatilizes, the macro-size gold-based self-assembled monolayer closely-packed nanofilm is obtained; and finally, the film is completely fished out by usinga glass sheet subjected to acid and alkali treatment, and the surface of the film is washed by ethyl alcohol and then dried under vacuum or nitrogen atmosphere. According to the method, operation is easy, the closely-packed gold nanoparticle monolayer film which is monolayer, high in quality, close in packing and macro in size, and can be used as a Raman enhanced substrate can be obtained, the uniform surface enhanced Raman scattering property is achieved, and thus quantitative detection of the macro-size closely-packed gold nanoparticle monolayer film in the field of Raman enhancement is achieved.

Description

technical field [0001] The invention relates to a method for preparing a macro-sized close-packed gold nanoparticle monolayer film that can be used as a Raman enhanced substrate, and belongs to the technical field of noble metal nanoparticle self-assembly. Background technique [0002] Surface-enhanced Raman scattering is an optical tool with fingerprint-specific detection, which can quickly and sensitively detect biochemical molecules in trace amounts, and has many applications in medicine, biology, chemistry, optics, etc. Therefore, its substrate stability, detection sensitivity, and reproducibility are of paramount importance. At present, people have enhanced the stability and sensitivity of surface-enhanced Raman scattering through various means, but the reproducibility of its detection is still a big problem. [0003] The construction of the substrate is the key to improving the quality of surface-enhanced Raman scattering detection: the material, "hot spot" and arrang...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B82Y40/00
CPCB22F9/24B82Y40/00
Inventor 夏海兵夏侯玉娇陶绪堂
Owner SHANDONG UNIV