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A kind of sol and method for preparing surface-enhanced Raman substrate

A surface-enhanced Raman and substrate technology, applied in the field of nanomaterials and Raman detection, can solve the problems of high preparation cost, low enhancement factor, complex and cumbersome process, etc., and achieve the effect of easy preparation, strong enhancement performance and high sensitivity

Inactive Publication Date: 2018-04-20
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a simple, fast, cheap and easy-to-preparation method for preparing a surface-enhanced substrate in order to overcome the defects of high preparation cost, complex and cumbersome process, poor repeatability and low enhancement factor in the prior art

Method used

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  • A kind of sol and method for preparing surface-enhanced Raman substrate
  • A kind of sol and method for preparing surface-enhanced Raman substrate
  • A kind of sol and method for preparing surface-enhanced Raman substrate

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Silver Nanoparticle Synthesis

[0034] Weigh 18 mg silver nitrate (AgNO 3 ) was dissolved in 100 mL ultrapure water, fully dissolved, and another 2 mL of sodium citrate (Na 3 C 6h 5 o 7 ) solution (1 wt%) for later use, that is, weigh 0.023 g sodium citrate dihydrate (Na 3 C 6 h 5 o 7 2H 2 O) Dissolve in 2 ml ultrapure water. AgNO 3 The solution was heated to boiling, and Na was gradually added dropwise while stirring. 3 C 6 h 5 o 7 solution to boiling AgNO 3 In the solution, continue to stir and keep the solution boiling for 15 min, then stop heating, and the solution is naturally cooled to room temperature to obtain a gray-green silver sol, which is stored in the dark at 4 °C. The average particle size of the synthesized silver nanoparticles is about 60 nm, and the maximum absorption wavelength is 425 nm when irradiated with ultraviolet-visible light.

[0035] Self-Assembly of Silver Nanoparticles on the Surface of Si Sheet

[0036] 0.5 ml of ascorbic...

Embodiment 2

[0046] Silver Nanoparticle Synthesis

[0047] Weigh 18 mg silver nitrate (AgNO 3 ) was dissolved in 100 mL ultrapure water, fully dissolved, and another 3 mL of sodium citrate (Na 3 C 6 h 5 o 7 ) solution (1 wt%) for later use. AgNO 3 The solution was heated to boiling, and Na was gradually added dropwise while stirring. 3 C 6 h 5 o 7 solution to boiling AgNO 3 In the solution, continue to stir and keep the solution in a boiling state for 60 min, then stop heating, and the solution is naturally cooled to room temperature to obtain a gray-green silver sol, which is stored in the dark at 4 °C. The average size of the synthesized silver nanoparticles is about 59 nm.

[0048] Self-Assembly of Silver Nanoparticles on the Surface of Si Sheet

[0049] 0.04 ml of ascorbic acid (AA) was added to 20 ml of freshly prepared silver sol under vigorous stirring to activate it. A 1 cm×1 cm silicon wafer was washed with ultrapure water, acetone, ethanol, and ultrapure water in seq...

Embodiment 3

[0053] Silver Nanoparticle Synthesis

[0054] Silver nanoparticles were synthesized according to the method of Example 1.

[0055] Self-Assembly of Silver Nanoparticles on the Surface of Si Sheet

[0056] Activate by adding 2 ml of 0.1 M ascorbic acid (AA) to 20 ml of freshly prepared silver sol under vigorous stirring. A 1 cm×1 cm silicon wafer was washed with ultrapure water, acetone, ethanol, and ultrapure water in sequence, and N 2 blow dry. Then immersed in the activated silver sol, assembled for 1 h.

[0057] Morphology and property analysis of surface-enhanced Raman substrates

[0058] Figure 4 It is the SEM image of the silver nanoparticles assembled on the Si surface after adding the activator AA. It can be seen that the AgNPs are assembled into a single layer, but due to the large amount of AA added, AgNPs aggregate in some areas. When using R6G to detect its Raman performance, it is measured that 10 -7 M R6G I SERS =9.83×10 4 , the Raman enhancement eff...

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Abstract

The invention relates to a sol and a method for preparing a surface-enhanced Raman substrate. The surface-enhanced Raman substrate of the present invention includes a substrate and a sensitive layer. The substrate is a silicon wafer or a glass substrate. The sensitive layer is silver nanoparticles deposited on the surface of the substrate through self-assembly. The preparation method of the surface-enhanced Raman substrate comprises the following steps: dissolving 9‑‑18 mg of silver nitrate (AgNO3) in 100 mL of ultrapure water, fully dissolving, and taking another 2 mL of sodium citrate (Na3C6H5O7) solution, The silver sol was prepared and then activated with ascorbic acid. The substrate was immersed in the activated silver sol and assembled for 1‑72 h. The simple self-assembly strategy proposed by the present invention is cheap, simple, high in sensitivity and fast in speed.

Description

technical field [0001] The invention relates to the fields of nanomaterials and Raman detection, in particular to a solution and a method for preparing a surface-enhanced Raman substrate. Background technique [0002] It has been a great challenge to prepare a chemically stable, uniform, high-enhanced and reproducible surface-enhanced Raman substrate using a simple method. The shape, size and aggregation state of plasmonic nanostructures will affect the enhancement performance. Molecules adsorbed in nanostructure interstices (often called hotspots) have enhanced performance orders of magnitude higher than molecules adsorbed on the surface of isolated nanoparticles. In order to obtain greater signal enhancement, it is important to increase the density of surface-enhanced Raman substrate nanoparticles and reduce the distance of the nanostructure gap. With the rapid development of nanoscience and technology, methods for preparing surface-enhanced Raman substrates are also eme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C18/44G01N21/65B82Y40/00
Inventor 廖俊生姜交来汪小琳贾建平吴昊曦王少飞张靖杜云峰
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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