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Surface-enhanced Raman scattering substrate based on surface plasmon polariton local-field coupling effect and preparation method of surface-enhanced Raman scattering substrate

A surface plasmon and surface-enhanced Raman technology, applied in Raman scattering, material excitation analysis, etc., can solve the problems of difficulty in preparing large-area micro-nano structures, high production costs, poor stability and repeatability, and achieve controllable High reliability, low cost and high repetition rate

Inactive Publication Date: 2012-07-11
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

At present, most of the SERS substrates prepared by chemical methods are disordered structures. Although the preparation method is simple and can obtain a high enhancement factor, the stability and repeatability are poor; physical methods such as electron beam lithography (Electron Beam Lithography, EBL), ion Techniques such as Foucsed ion beam (FIB) can prepare ordered structures with good repeatability, but their fabrication costs are high and it is difficult to fabricate large-area micro-nano structures.

Method used

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  • Surface-enhanced Raman scattering substrate based on surface plasmon polariton local-field coupling effect and preparation method of surface-enhanced Raman scattering substrate
  • Surface-enhanced Raman scattering substrate based on surface plasmon polariton local-field coupling effect and preparation method of surface-enhanced Raman scattering substrate
  • Surface-enhanced Raman scattering substrate based on surface plasmon polariton local-field coupling effect and preparation method of surface-enhanced Raman scattering substrate

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specific Embodiment

[0032] Preparation of structure (A): First, Ag particles were prepared by the wet chemical method reported by Skrabalak et al. 2S is the catalyst, PVP is the surfactant, and the mixed solution of ethylene glycol and silver nitrate is continuously stirred under the condition of 150°C oil bath, and the silver nitrate is reduced to obtain Ag nanocube 1, and the aqueous solution of Ag nanocube is obtained after centrifugation. Then, an Ag nanoscale thin film 3 is evaporated on a clean glass substrate 4 using vacuum evaporation equipment. A layer of PMMA / anisole solution was then spin-coated on the Ag film, and dried in an oven at 85°C to form a film 2. Finally, an aqueous solution of Ag nanocubes was added dropwise on the PMMA layer and allowed to dry naturally. Among them, the preparation of Ag nanoparticles by wet chemical method is a commonly used method in this field. The method reported by Skrabalak et al. is one of the methods for preparing Ag nanoparticles by wet chemical ...

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Abstract

The invention discloses a surface-enhanced Raman scattering substrate based on a surface plasmon polariton local-field coupling effect and a preparation method of the surface-enhanced Raman scattering substrate, and relates to a molecular detection and recognition technique and a preparation method of a metal micro / nano structure. The surface-enhanced Raman scattering substrate consists of the metal micro / nano structure with nano-scale gaps. The surface plasmon polariton local-field coupling effect exists in the gaps. The specific types of the surface-enhanced Raman scattering substrate comprises an Ag nano particle and Ag membrane coupling system, an Ag nano particle and Ag nano aperture array coupling system, and an Ag nano sphere cap and Ag nano aperture coupling system. The preparation method comprises a wet chemical method and a vacuum thermal evaporation deposition method. The preparation method of the surface-enhanced Raman scattering substrate is safe, simple and convenient, complex equipment is not required, the cost is low, the structure is stable and controllable, the repeatability is high and high enhanced factors can be provided at the same time.

Description

technical field [0001] The present invention relates to the field of molecular recognition technology and micro-nano composite structure preparation, in particular to a surface-enhanced Raman scattering substrate based on surface plasmon polaritons (Surface Plasmon Polaritons, SPPs) local field coupling effect, specifically including: The volume polariton coupling effect and its enhanced optical effect, using polymethyl methacrylate (PMMA) film or polystyrene (PS) balls that are easy to form a film and have controllable thickness as the spacer layer, can easily and effectively adjust the metal micro The optical properties of the nano-coupling structure, and based on this structure, the innovative design and application scheme of the surface-enhanced Raman scattering (SERS) spectroscopy measurement of the probe molecule. Background technique [0002] Raman spectroscopy is a spectroscopic technique to study the vibrational energy levels of molecules and can be widely used in t...

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Application Information

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IPC IPC(8): G01N21/65
Inventor 温晓镭王沛张斗国鲁拥华明海
Owner UNIV OF SCI & TECH OF CHINA
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