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Method for improving enhancement factors of surface-enhanced infrared absorption spectrum

A technology of infrared absorption spectroscopy and surface enhancement, which is applied in the field of electrochemical detection and can solve problems such as not getting ideal results.

Active Publication Date: 2013-02-13
JIANGXI INST OF RARE EARTHS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

According to our experimental observation, the direct combination of nanorods and metal island films cannot achieve the desired effect

Method used

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  • Method for improving enhancement factors of surface-enhanced infrared absorption spectrum
  • Method for improving enhancement factors of surface-enhanced infrared absorption spectrum
  • Method for improving enhancement factors of surface-enhanced infrared absorption spectrum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Preparation of gold nano-island membranes. 0.03M NaAuCl 4 Solution, 0.3M Na 2 SO 4 , 0.1MNa 2 S 2 o 3 , 0.1M NH 4 The Cl mixed solution and the HF solution with a volume fraction of 3% were mixed sequentially at a volume ratio of 1:1:1, and quickly and evenly dropped on the surface of the silicon crystal heated to 70°C in a water bath, and deposited for 60s. Then, the silicon crystal deposited with the gold film was installed on the surface-enhanced infrared spectroscopy reaction cell.

[0045] Add 0.5 mL of ethanol to the reaction cell as a background spectrum. Then add 0.5mL 2mM p-mercaptoaniline (PATP) ethanol solution, collect the sample spectrum, each spectrum is superimposed by 512 scans, after monitoring for 20min, the intensity of the infrared absorption spectrum remains basically unchanged, indicating that the adsorption of PATP on the surface of the gold film reaches saturation, the obtained curve is as follows figure 2 Shown in solid line (a). Then...

Embodiment 2

[0048] According to the method provided in Example 1, the first layer is a gold nano-island film, the second layer is D-penicillamine, and the third layer is a sandwich structure of gold nanorods, and the enhancement factor reaches 500 times.

Embodiment 3

[0050] According to the method provided in Example 1, the enhancement factor is expanded to 400 times with the first layer being a gold nano-island membrane, the second layer being PATP, and the third layer being a gold nanoparticle-supported macroporous carbon sandwich structure.

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Abstract

The invention provides a method for improving enhancement factors of a surface-enhanced infrared spectrum by means of a sandwich structure. In the sandwich structure, a first layer is a gold nano-island film; a second layer is a material to be detected; and the third layer is a metal nanorod. Infrared light excites the gold nano-island film and the metal nanorod to couple between surface plasma fields, so that an infrared absorption spectrum of analytes in the sandwich structure is greatly enhanced. The analytes can be replaced into the material required to be detected according to the experimental requirements. Due to the adoption of the method, the enhancement factors of the surface-enhanced infrared spectrum are better improved, and the application field of surface-enhanced infrared is hopefully expanded.

Description

technical field [0001] The invention relates to the field of electrochemical detection, in particular to a method for increasing the enhancement factor of a surface-enhanced infrared absorption spectrum. Background technique [0002] Surface-enhanced infrared absorption means that when materials with infrared activity are modified on metal island films such as gold, silver, and copper, the electrons of the metal island film are excited by infrared light to form surface plasmons, which are coupled with the incident light field to make the absorbing molecules The infrared absorption is greatly enhanced, resulting in a surface-enhanced infrared absorption phenomenon. Therefore, surface-enhanced infrared absorption spectroscopy (Surface-Enhanced Infrared Absorption spectroscopy, SEIRAS) is an important analysis and detection method for studying the structure and function of interface molecules. However, the enhancement factor of the metal thin film prepared by the vacuum evapor...

Claims

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Application Information

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IPC IPC(8): G01N21/35
Inventor 曹凤娟姜秀娥
Owner JIANGXI INST OF RARE EARTHS CHINESE ACAD OF SCI
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