Metal nanodot array surface enhancing Raman active base and preparation method thereof

Abstract

The invention discloses a metal nanodot array surface enhancing Raman active base and a preparation method thereof. The base takes silicon single crystals as the substrate, and metal nano particles forming an array structure are deposited on the surface of silicon; and further, the particle sizes of the metal nano particles range from 16 to 85nm, and the center distances of the particles range from 99 to 111nm. The metal nanodot array surface enhancing Raman active base provided by the invention is uniform in morphology, is controllable in structure, has a remarkable surface Raman enhancing effect on analytes of different concentration, and has a uniform and stable enhancing signal. Through the method provided by the invention, structural parameters and morphology of the metal nanodot array can be adjusted according to structural parameter of an ultrathin aluminum oxide template, and different influences on the Raman surface enhancing effect by different metal nanodot array bases can be realized; and further, the base and method have the advantages of simplicity for operation, low cost and easiness for industrial production.

Description

technical field [0001] The invention relates to a gold nano-lattice surface-enhanced Raman active substrate and a preparation method thereof, in particular to a gold nano-lattice surface enhancement technology based on UTAM (Ultra-Thin Alumina Mask, ultra-thin alumina template) surface nano preparation technology Raman active substrate and preparation method thereof. Background technique [0002] Surface-enhanced Raman spectroscopy (SERS) is a high-sensitivity real-time nondestructive testing technique for studying molecular surfaces and their interactions. Surface-enhanced Raman spectroscopy overcomes the shortcomings of low sensitivity of ordinary Raman spectroscopy. It can give molecular structure information and infer the adsorption orientation of molecules on the substrate surface. It has a wide range of applications in the fields of biology, chemistry, medicine and environmental monitoring. . The signal of SERS is closely related to the substrate. The activity of the...

AI Technical Summary

Problems solved by technology

[0003] 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, but these self-assembled Reactive substrates provide difficult-to-control surface roughness, which affects the stability, uniformity, and reproducibility of 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.

Images