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Surface enhanced raman spectroscopy substrate of continuous three dimensional structural nano silver and preparation method thereof

A surface-enhanced Raman and three-dimensional structure technology, which is applied in nanostructure manufacturing, Raman scattering, nanotechnology, etc., can solve the problems of poor signal uniformity, complex preparation process, and low sensitivity of nano-silver surface-enhanced Raman spectroscopy substrate. Achieve the effect of fast and accurate signal searching, high detection sensitivity and strong Raman signal

Inactive Publication Date: 2009-10-28
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of poor signal uniformity, low sensitivity, complex preparation process and high cost of the nano-silver surface-enhanced Raman spectrum substrate prepared by the prior art

Method used

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  • Surface enhanced raman spectroscopy substrate of continuous three dimensional structural nano silver and preparation method thereof
  • Surface enhanced raman spectroscopy substrate of continuous three dimensional structural nano silver and preparation method thereof
  • Surface enhanced raman spectroscopy substrate of continuous three dimensional structural nano silver and preparation method thereof

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specific Embodiment approach 1

[0010] Specific Embodiment 1: In this embodiment, the continuous three-dimensional structure nano-silver surface-enhanced Raman spectroscopy substrate consists of a polyaniline film (1), a nano-gold layer (2) and a three-dimensional nano-silver layer (3) from bottom to top. The film (1) is made of undoped polyaniline powder and N-methylpyrrolidone at a mass ratio of 1:3.

[0011] Schematic diagram of the structure of the surface-enhanced Raman spectrum substrate of the continuous three-dimensional structure nano-silver in this embodiment, such as figure 1 shown. The surface-enhanced Raman spectrum substrate of the continuous three-dimensional nano-silver structure in this embodiment can be widely used in the detection of organic molecules and biomolecules at ppm level concentrations.

specific Embodiment approach 2

[0012] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the thickness of the polyaniline film (1) in the surface-enhanced Raman spectroscopy substrate of nano-silver with continuous three-dimensional structure is between 80 and 200 μm. Other parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0013] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that the particle size of the gold in the nano-gold layer (2) in the surface-enhanced Raman spectroscopy substrate of nano-silver with continuous three-dimensional structure is 10-100 nm. Other parameters are the same as those in Embodiment 1 or Embodiment 2.

[0014] In this embodiment, the nano-gold layer (2) of the obtained continuous three-dimensional structure nano-silver surface-enhanced Raman spectroscopy substrate is characterized by surface microscopic morphology, such as figure 2 shown. Depend on figure 2 It can be seen that the nano-gold particles are evenly distributed on the nano-gold layer (2), and the particle size distribution is between 10-100 nm.

[0015] In this embodiment, the nano-gold layer provides a large number of continuous active points for the growth of nano-silver particles, and provides good conditions for the growth of a continuous three-dimensional structured n...

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Abstract

A surface enhanced raman spectroscopy substrate of continuous three dimensional structural nano silver and a preparation method thereof relate to a surface enhanced raman spectroscopy substrate of nano silver and a preparation method thereof. The invention solves the problems of the surface enhanced raman spectroscopy substrate of nano silver prepared by the prior art, such as poor signal uniformity, low sensitivity, complicated preparation technique and high cost. The substrate consists of a polyaniline film, a nano gold layer and a three dimensional nano silver layer sequentially from bottom to top. The preparation method of the substrate comprises the steps of: dissolving undoped polyaniline powder in N-methylpyrrolidone to form homogeneous solution, spreading the solution on a glass substrate, conducting curing to obtain the polyaniline film; later dipping the polyaniline film in gold-bearing solution to obtain the nano gold layer; and then dipping the polyaniline film coated with the nano gold layer in silver nitrate soluation for reaction to obtain the surface enhanced raman spectroscopy substrate of the continuous three dimensional structural nano silver. The substrate can be used for detection of organic molecules and biological molecules with ppm concentration and has uniform signal response, high sensitivity, simple and fast method, and low cost.

Description

technical field [0001] The invention relates to a nano-silver surface-enhanced Raman spectrum substrate and a preparation method thereof. Background technique [0002] Surface-enhanced Raman spectroscopy was discovered in the 1970s. It was developed based on the Raman spectroscopy discovered in 1927, but the signal intensity of surface-enhanced Raman spectroscopy is several to ten orders of magnitude stronger than that of Raman spectroscopy. Simple, fast and cheap technical means for molecules and biomolecules. Metallic silver is the best substrate for surface-enhanced Raman spectroscopy, and its signal intensity is generally two to three orders of magnitude higher than that of metallic gold. Therefore, there are currently many researches focusing on the preparation, assembly, and surface modification of nano-silver substrates for surface-enhanced Raman spectroscopy. etc. research work. [0003] Surface-enhanced Raman spectroscopy requires a certain roughness on the surfac...

Claims

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Application Information

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IPC IPC(8): G01N21/65B82B3/00
Inventor 徐平韩喜江张彬
Owner HARBIN INST OF TECH
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