SERS substrate material and preparation method thereof

A substrate material and substrate technology, applied in the field of environmental science, can solve the problems of complex preparation process of film substrate, influence on test results, difficult process control, etc., and achieve the effect of cheap raw materials, simple process, and inhibition of agglomeration

Inactive Publication Date: 2016-10-05
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the addition of a variety of organic solvents during the preparation process, organic matter will remain on the surface of the obtained film, which will affect the test results, and the preparation process of the film substrate is complicated and the process is difficult to control

Method used

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  • SERS substrate material and preparation method thereof
  • SERS substrate material and preparation method thereof
  • SERS substrate material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Ultrasonically disperse 2 g of boehmite in 10 g of deionized water, spin-coat the colloidal solution on the surface of a clean silicon substrate with a homogenizer at a speed of 700 rev / min, dry at room temperature for 30 min, and place it in a muffle furnace for 15 The heating rate of ℃ / min was heated to 500 ℃, and then cooled naturally after 2 hours of heat preservation to obtain a nano-alumina coated carrier with a uniform pore size distribution and a coating thickness of 1.2 μm. Prepare 5 ml of silver nitrate solution with a mass fraction of 0.1% and 5 ml of sodium citrate solution with a mass fraction of 0.05%, and mix the two solutions to obtain a reaction solution. Immerse the nano-alumina-coated carrier in the reaction solution, irradiate it under a 100w ultraviolet mercury lamp for 1h, take out the carrier, wash it with deionized water, and then dry it under high-purity nitrogen to obtain a nano-Ag surface-enhanced Raman spectrum base material.

Embodiment 2

[0027] Ultrasonically disperse 3g of boehmite in 10g of deionized water, spin-coat the colloid solution on the surface of a clean silicate glass substrate with a homogenizer at a speed of 700rev / min, dry it at room temperature for 30min, and place it in a muffle furnace Heating to 500°C at a heating rate of 5°C / min, keeping the temperature for 2 hours, and then cooling naturally to obtain a nano-alumina coated carrier with a uniform pore size distribution and a coating thickness of 1.5 μm. Configure 5 ml of silver nitrate solution with a mass fraction of 0.05% and 5 ml of sodium citrate solution with a mass fraction of 0.05%, and mix the two solutions to obtain a reaction solution. Immerse the nano-alumina-coated carrier in the reaction solution, irradiate it under a 100w ultraviolet mercury lamp for 2 hours, take out the carrier, rinse it with deionized water, and then dry it under high-purity nitrogen to obtain a surface-enhanced Raman spectrum of nano-Ag base material.

Embodiment 3

[0029] Ultrasonically disperse 2g of boehmite in 10g of deionized water, spin-coat the colloidal solution on the surface of a clean silicate glass substrate with a homogenizer at a speed of 500rev / min, dry it at room temperature for 30min, and place it in a muffle furnace Heating to 500°C at a heating rate of 5°C / min, keeping the temperature for 2 hours, and cooling naturally to obtain a nano-alumina coated carrier with a uniform pore size distribution and a coating thickness of 1.2 μm. Prepare 5 ml of silver nitrate solution with a mass fraction of 0.1% and 5 ml of sodium citrate solution with a mass fraction of 0.01%, and mix the two solutions to obtain a reaction solution. Immerse the nano-alumina-coated carrier in the reaction solution, irradiate it under a 100w ultraviolet mercury lamp for 0.5h, take out the carrier, wash it with deionized water, and then dry it under high-purity nitrogen to obtain a nano-Ag surface-enhanced Raman Spectral base material. figure 1 It is a...

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Abstract

The invention provides a SERS substrate material and a preparation method thereof. The preparation method comprises the following steps: preparing a nanometer alumina coating with a certain thickness and uniform pore size distribution from boehmite; impregnating the coating in a precious metal precursor solution; and carrying out deposition and immobilization of precious metal nanoparticles by using a method employing a combination of a reducing agent and irradiation by a high-pressure mercury lamp. The method uses cheap raw materials, is simple in process and has easily controllable process conditions; and the obtained SERS substrate material has good stability and uniform hot spot distribution and shows high sensitivity and repeatability in ultralow-concentration detection.

Description

technical field [0001] The invention relates to the fields of environmental science, analytical chemistry, biochemistry and the like, in particular to a surface-enhanced Raman spectrum base material and a preparation method thereof. Background technique [0002] Surface-enhanced Raman spectroscopy (SERS) technology has extremely high sensitivity, and the detection sensitivity of certain molecules is 10 times higher than that of ordinary Raman spectroscopy. 2 ~10 14 times, it can detect monomolecular layer and submonolayer substances adsorbed on the metal surface, and provide rich molecular structure information. As a spectroscopic analysis technique with development potential, SERS has broad application prospects in chemistry, physics, biology, medicine, environmental monitoring, public safety and so on. As we all know, the preparation of active substrates is the key to obtain better SERS signals, especially the preparation of SERS active substrates with strong enhancement...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C26/00G01N21/65
Inventor 王田禾杨靖瑛杨勇俞佳杰
Owner NANJING UNIV OF SCI & TECH
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