Silver nano lattice surface enhanced raman active substrate and preparation method thereof
一种表面增强拉曼、活性基底的技术，应用在拉曼散射、纳米技术、材料激发分析等方向，能够解决影响吸附分子光谱稳定性、设备昂贵、制备成本高等问题，达到显著表面拉曼增强效果、增强信号均一稳定、易于工业生产的效果
Inactive Publication Date: 2012-07-18
SHANGHAI UNIV
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Problems solved by technology
There are many traditional SERS active substrates commonly used at present, such as: electrochemically roughened noble metal active electrode substrates, noble metal sol active substrates, vacuum-evaporated noble metal island film active substrates, and chemically etched and chemically deposited noble metal active substrates. However, these self-assembled The surface roughness provided by the active substrate is difficult to control and thus affects the stability, uniformity and repeatability of the spectra of adsorbed molecules
In recent years, the methods for preparing ordered surface nanostructures that have been studied more have some disadvantages and limitations in preparation and application. For example, the surface nanostructures prepared by electron beam lithography and scanning probe method have a small area, Low yield and expensive equipment; for self-organized growth methods and nanoimprint methods, it is often difficult to adjust the structural parameters of surface nanostructures
Moreover, its development is limited due to its cumbersome preparation procedures, high preparation costs and low preparation efficiency.
Method used
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Experimental program
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Effect test
Embodiment 1
[0027] Embodiment 1: In this embodiment, UTAM is used as a template to prepare a large-area ordered and uniform Ag nanoparticle lattice on a Si substrate, and a 1 × 10 -7 M's rhodamine (rhodamine 6G, R6G) was used as the probe molecule for the surface Raman spectrum test. First, a 0.2 mm thick 99.999% aluminum sheet was ultrasonically cleaned with acetone for 30 min, annealed at 450-550 °C under nitrogen protection, and then placed in a mixture of ethanol and perchloric acid (volume ratio 1:9) at a temperature of 0 °C under constant flow. Electrochemical polishing under the condition of (750 mA) to prepare a spare aluminum sheet. The pretreated spare aluminum sheet was oxidized in 0.3 M oxalic acid at 40 V for 12 h at 4°C, taken out, and placed in a mixed solution of 1.8w% chromic acid and 6w% phosphoric acid with a volume ratio of 1:1. Corrosion at a temperature of 60°C for 10 h; rinsed repeatedly with deionized water, then placed in an electrolytic cell, and carried out sec...
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Abstract
The invention discloses a silver nano lattice surface enhanced raman active substrate and a preparation method thereof. According to the substrate, silicon single crystal is used as an underlay; a silver nanoparticle array structure is deposited on the silicon surface; the particle size of the silver nanoparticles is 30-90 nm; and the center distance of the particles is 99-111 nm. The silver nano lattice surface enhanced raman active substrate provided by the invention has a uniform shape and a controllable structure, and has an obvious surface raman enhancement effect on analytes of different concentrations, and an enhancement signal is uniform and stable. According to the method, the structural parameters and the shape of a silver nano lattice can be adjusted according to structural parameters of an ultra-thin aluminum oxide template, so that different influences of different metal nano lattice substrates on a raman surface enhancement effect are realized. The substrate and the method have the advantages of easiness for operation, low cost and easiness for industrial production.
Description
technical field [0001] The invention relates to a silver nano-lattice surface-enhanced Raman active substrate and a preparation method thereof, in particular to a silver nano-lattice surface enhancement based on UTAM (Ultra-Thin Alumina Mask, ultra-thin alumina template) surface nano-preparation technology. Raman active substrate and method for its preparation. Background technique [0002] Surface-enhanced Raman Scattering (SERS) has attracted widespread attention since it was discovered in 1974, because of its high sensitivity, it can detect monomolecular layers and sublayers adsorbed on metal surfaces. Molecules in the monolayer, which can give the structural information of surface molecules, are considered to be a very effective tool for probing interface properties and intermolecular interactions, and characterizing surface molecular adsorption behavior and molecular structure. SERS technology has gradually become a powerful research method in the field of surface scie...
Claims
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IPC IPC(8): G01N21/65B82Y40/00
Inventor 付群雷勇窦金霞郑燕胡芸芸王沙沙周懿吴明红李珍
Owner SHANGHAI UNIV
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