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Preparation method of nano silver substrate for SERS (Surface Enhanced Raman Scattering)

A nano-silver and substrate technology, applied in the direction of Raman scattering, material excitation analysis, etc., can solve the problems of unsatisfactory SERS substrate reproducibility, poor control of the substrate, short storage time, etc., and achieve strong Raman benefits and process conditions Easy to control, long-lasting effects

Active Publication Date: 2013-11-20
FUJIAN AGRI & FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to overcome the shortcomings of existing SERS substrates such as unsatisfactory reproducibility, short storage time, and poor regulation of the substrate, the purpose of the present invention is to provide a preparation method for nano-silver substrates for SERS, which has the advantages of simple process, convenient operation, and Fast, easy control of process conditions, etc.

Method used

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  • Preparation method of nano silver substrate for SERS (Surface Enhanced Raman Scattering)
  • Preparation method of nano silver substrate for SERS (Surface Enhanced Raman Scattering)
  • Preparation method of nano silver substrate for SERS (Surface Enhanced Raman Scattering)

Examples

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Embodiment 1

[0028] Use deionized water to prepare 100ml of a 0.1% methylcellulose (molecular weight of 100000, methoxy content of 27.5%) solution, add 0.1g of sodium citrate with methylcellulose, and stir evenly to increase to 75°C, add 100ml of 10mmol / L silver ammonia solution under stirring conditions, adjust the pH to 6.8, and react at 75°C for 2.5 hours to obtain the nano-silver substrate for SERS. The transmission electron microscope image of the nano-silver substrate is shown figure 1 , Nano size is 50-80nm, stable storage period is 8 months.

Embodiment 2

[0030] Use deionized water to prepare 100ml of hydroxyethyl cellulose with a mass fraction of 0.75% (the molecular weight of hydroxyethyl cellulose is 220,000-250,000, and the degree of substitution is 1.8-2.0) solution, add 0.5g of sodium citrate, and stir evenly. Raise to 70℃, add 100ml of 5mmol / L silver ammonia solution under stirring conditions, adjust the pH to 7, and react at 70℃ for 3 hours to obtain nano silver substrates for SERS, transmission electron microscope of nano silver substrates See picture figure 2 , Nano size is 60-80nm, stable storage period is 8 months.

Embodiment 3

[0032] Use deionized water to prepare 100ml of 0.075% mass fraction of hydroxypropyl methylcellulose (molecular weight: 20000-150000, methoxy content of 25-30%, hydroxypropyl 7.0-12%) solution, and add 0.05g of lemon After stirring the sodium, the temperature is raised to 75°C, 100ml of 7.5mmol / L silver ammonia solution is added under stirring, the pH is adjusted to 7, and the reaction is carried out at 75°C for 1.5 hours to obtain the nano-silver substrate for SERS. The transmission electron microscope picture of the nano silver substrate is shown image 3 , Nano size is 60-70nm, stable storage period is 8 months.

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Abstract

The invention discloses a preparation method of a nano silver substrate for SERS (Surface Enhanced Raman Scattering). The preparation method comprises the steps of dissolving a cellulose derivative in deionized water, adding a certain amount of sodium citrate, uniformly stirring while heating to a certain temperature, adding a silver ammonia solution with the same volume as that of a methylcellulose solution, regulating the pH value to be 6-8, and reacting for 1.5h-3.5h at a temperature of 60-90 DEG C to obtain the nano silver substrate for SERS. The preparation method is simple in process, convenient to operate and rapid in preparation; raw materials are low in cost and process conditions are easily controlled; the production process is greatly simplified, time is saved and the cost is lowered. The prepared nano silver substrate has the advantages of controllable and adjustable particle size, long storage time, stable property and the like, and has a strong SERS effect and wide application prospect.

Description

Technical field [0001] The invention belongs to the technical field of nano materials science and laser Raman detection, and specifically relates to a nano silver substrate for surface enhanced Raman spectroscopy and a preparation method thereof. Background technique [0002] The surface-enhanced Raman scattering (SERS) effect can greatly enhance the Raman signal intensity of certain species adsorbed on the surface of certain nanostructures. The surface-enhanced Raman spectroscopy developed from this is a surface detection with ultra-high sensitivity Spectroscopy technology has been successfully used in the fields of surface chemistry, electrochemistry, analytical chemistry and biological detection. Surface-enhanced Raman spectroscopy (SERS) requires less sample detection, is non-destructive to samples, and has the advantages of high sensitivity . [0003] In the surface-enhanced Raman spectroscopy technology, the incident laser wavelength, the excitation intensity, and the analys...

Claims

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Application Information

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IPC IPC(8): G01N21/65
Inventor 卢玉栋陈礼辉黄六莲
Owner FUJIAN AGRI & FORESTRY UNIV
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