Uniform-height nano-silver surface-enhanced Raman scattering active substrate

An active substrate, nano-silver technology, applied in the field of analytical chemistry, to achieve the effect of simple and easy preparation process, strong uniformity and good method reproducibility

Inactive Publication Date: 2013-08-14
FUZHOU UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, many self-assembly methods are difficult to control the physical spacing of nanoparticles, forming a large number of "hot spots" (J.Phys. Chem. Lett., 2012, 3, 2303)

Method used

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  • Uniform-height nano-silver surface-enhanced Raman scattering active substrate
  • Uniform-height nano-silver surface-enhanced Raman scattering active substrate
  • Uniform-height nano-silver surface-enhanced Raman scattering active substrate

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Embodiment 1

[0032] The following examples illustrate the operation process of applying the method of the present invention to prepare a highly uniform nano-silver SERS active substrate in conjunction with the accompanying drawings:

[0033] (1) Preparation of nano-silver sol

[0034] Nano silver sol was prepared by chemical reduction method (J. Phys. Chem. C 2010, 114, 7427–7431). In 40mL of PEG solution, add 444mg of PVP, heat to 80°C, after the solution is stirred until clear, quickly add 1mL of 0.5M silver nitrate solution, continue heating and stirring, the color of the solution changes from colorless to light yellow. The solution was transferred to an 80mL polytetrafluoroethylene reactor and heated to 260° for 24h. Characterized by TEM, the average particle size was 60 nm ( figure 2 ).

[0035] (2) Preparation of highly uniform nano-silver SERS active substrate

[0036] First, use a mixed solution of concentrated sulfuric acid and 30% hydrogen peroxide (volume ratio 4:1) to oxid...

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Abstract

The invention discloses a uniform-height nano-silver SERS (Surface Enhanced Raman scattering) active substrate and a preparation method thereof. A surfactant CTAB (Cetyltrimethyl Ammonium Bromide) serves as a coupling agent; glass, silicon or silicon dioxide serves as a solid-phase matrix; nano-silver particles are fixed by using a physical absorption method and are distributed on the surface of a solid-phase substrate in a single-layer manner; CTAB generates autogenous shrinkage in the drying process to reduce the distance between the two adjacent nano-silver particles, so that the nano-silver particles are distributed densely; a great number of hotspot structures are generated; and the SERS effect of the substrate is enhanced. The uniform-height nano-silver SERS active substrate can be prepared simply and quickly with low cost by using the method. The prepared SERS active substrate is convenient to store and carry, and is expected to conduct the high-sensitivity rapid analysis on certain environmental pollutants or food safety contaminants in a laboratory and outdoor fields.

Description

technical field [0001] The invention belongs to the field of analytical chemistry, and in particular relates to a highly uniform nano-silver SERS active substrate and a preparation method thereof. Background technique [0002] The surface-enhanced Raman scattering (SERS) analysis method has the advantages of high sensitivity, short detection time, low interference, and the ability to obtain the fingerprint information of species by detecting molecular vibration spectra. It has been widely used in surface science, analytical science, and detection of biological systems. (Chem. Soc. Rev., 2008, 37, 885; Chem. Soc. Rev., 2008, 37, 898). However, whether SERS can be applied in practice depends largely on the enhancement, uniformity and stability of the SERS substrate (Mater. Today, 2012, 15, 16). Therefore, the preparation of SERS active substrates with good uniformity, high stability and strong enhancement effect is still a research hotspot in the field of SERS. [0003] The...

Claims

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Application Information

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IPC IPC(8): G01N21/65B81C1/00
Inventor郭隆华徐杨杨黄浩邱彬林振宇陈国南
OwnerFUZHOU UNIV