Production method of simple and high-effective Raman enhanced substrate

A substrate, high-efficiency technology, applied in the field of fluorescent materials, can solve problems such as limited use

Inactive Publication Date: 2016-12-21
SHANGHAI LANGYAN OPTOELECTRONICS TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the lack of sensitivity limits its use in ultra-high sensitivity detection

Method used

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  • Production method of simple and high-effective Raman enhanced substrate
  • Production method of simple and high-effective Raman enhanced substrate
  • Production method of simple and high-effective Raman enhanced substrate

Examples

Experimental program
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Embodiment 1

[0027] This embodiment relates to a preparation method of silver nanoparticles modified porous gold surface enhanced Raman substrate, such as figure 1 As shown, the steps are as follows:

[0028] 1. Preparation of porous gold:

[0029] Immerse a 100nm thick gold-silver alloy film in concentrated nitric acid for about 30 minutes to obtain porous gold with a pore size of 29nm. In this gold-silver alloy film, the mass fractions of gold and silver elements are 35% and 65% respectively;

[0030] Take out the porous gold and wash it repeatedly in deionized water to remove the residual chemicals on its surface;

[0031] 2. Preparation of seed crystals:

[0032] 10mL of 0.5mmol / LAgNO 3 Add the aqueous solution to 10mL of 0.5mmol / L sodium citrate aqueous solution, stir vigorously, and quickly add 0.6mL of 10mmol / L NaBH 4 Solution, after stirring, a suspension of silver nanoparticles, i.e. seed crystals, is obtained;

[0033] 3. Making the Ag@NPG substrate:

[0034] The porous gol...

Embodiment 2

[0041] This embodiment relates to a preparation method of silver nanoparticles modified porous gold surface enhanced Raman substrate, such as figure 2 As shown, the steps are as follows:

[0042] 1. Preparation of porous gold:

[0043] Immerse a 90nm thick gold-silver alloy film in concentrated nitric acid for about 5 minutes to obtain porous gold with a pore size of 22nm. In this gold-silver alloy film, the mass fractions of gold and silver elements are 30% and 70% respectively;

[0044] Take out the porous gold and wash it repeatedly in deionized water to remove the residual chemicals on its surface;

[0045] 2. Preparation of seed crystals:

[0046] 9mL of 0.45mmol / LAgNO 3 Add the aqueous solution to 9mL of 0.45mmol / L sodium citrate aqueous solution, stir vigorously, and quickly add 0.5mL of 9mmol / L NaBH 4 Solution, after stirring, a suspension of silver nanoparticles, i.e. seed crystals, is obtained;

[0047] 3. Making the Ag@NPG substrate:

[0048] Put the porous gol...

Embodiment 3

[0052] This embodiment relates to a preparation method of silver nanoparticles modified porous gold surface enhanced Raman substrate, such as figure 2 As shown, the steps are as follows:

[0053] 1. Preparation of porous gold:

[0054] Immerse a 110nm thick gold-silver alloy film in concentrated nitric acid for about 3 hours to obtain porous gold with a pore size of 36nm. In the gold-silver alloy film, the mass fractions of gold and silver elements are 40% and 60% respectively;

[0055] Take out the porous gold and wash it repeatedly in deionized water to remove the residual chemicals on its surface;

[0056] 2. Preparation of seed crystals:

[0057] 11 mL of 0.55 mmol / LAgNO 3 Add the aqueous solution to 11mL of 0.55mmol / L sodium citrate aqueous solution, stir vigorously, and quickly add 0.7mL of 11mmol / L NaBH 4 Solution, after stirring, a suspension of silver nanoparticles, i.e. seed crystals, is obtained;

[0058] 3. Making the Ag@NPG substrate:

[0059] The porous go...

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Abstract

The invention provides a production method of a simple and high-effective Raman enhanced substrate. The production method includes the steps of: respectively preparing a porous gold thin film and a seed crystal; soaking the porous gold thin film in a SnCl2 solution and air-drying the thin film, and soaking the thin film in a water solution containing the seed crystal, silver nitrate and polyvinylpyrrolidone so as to prepare an Ag@NPG substrate under irradiation of ultraviolet light, namely, the Raman enhanced substrate, wherein the porous gold thin film is prepared through a dealloying method. The seed crystal is prepared through a step of adding an AgNO3 water solution to a sodium citrate water solution with intensive stirring and quick addition of a NaBH4 solution to prepare the seed crystal. Compared with the prior art, the substrate integrates the porous gold and silver nano particles and can be matched with a portable Raman spectrum instrument for detection of molecules such as p-aminothiophenol, crystal violet in water solution, rhodamine 6G, etc.

Description

technical field [0001] The invention relates to a simple and efficient preparation method of a Raman enhanced substrate, which belongs to the technical field of fluorescent materials and can be used in conjunction with a portable Raman spectrometer to detect dye molecules. Background technique [0002] Surface-enhanced Raman spectroscopy (SERS) is an analytical and testing method with broad application prospects. The desktop Raman spectrometer analyzer used in traditional laboratories has the characteristics of high sensitivity, high resolution, and wide spectral range. Various accessories. Such instruments are bulky and not suitable for rapid on-site detection. The portable Raman spectrometer can detect unknown objects on the spot, and can quickly obtain the basic information of the substance before obtaining the laboratory analysis results, which not only ensures the safety of the operation, but also realizes rapid and accurate identification. However, the sensitivity o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65C23C18/14
CPCG01N21/658C23C18/14
Inventor 曾和平张玲仰敏
Owner SHANGHAI LANGYAN OPTOELECTRONICS TECH
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