Preparation method of micro/nano dendritic silver super-hydrophilicity film and application of film in surface enhanced Raman substrate

Abstract

The invention relates to a preparation method of a micro / nano dendritic silver super-hydrophilicity film and application of the film in a surface enhanced Raman substrate, belonging to the technical field of hydrophilic films. The preparation method comprises the following steps: parallelly arranging a flat high-purity aluminum sheet of which the thickness is no more than 500 mu m and the purity is more than 99% on a substrate, and immersing into a mixed solution composed of a silver nitrate solution with a mol concentration of 0.1-5 mmol / L and dilute sulfuric acid with a mass concentration of 15-65% while keeping the relative position unchanged, wherein the volume ratio of the silver nitrate solution to the dilute sulfuric acid is (3-7):1, the temperature is room temperature, and shaking should be avoided; and growing a micro / nano dendritic silver film on the substrate from the aluminum sheet taken as the center to the periphery through self assembling and spreading, taking out the substrate deposited with the micro / nano dendritic silver film from the solution through a liquid level uniform decline method, separating the remaining aluminum sheet, rinsing multiple times, and naturally drying. The film can be used for a surface enhanced Raman scattering active substrate for quick on-site real-time detection of a trace amount of substances.

Description

technical field [0001] The invention belongs to the technical field of hydrophilic thin films, and relates to a micro-nano dendritic silver super-hydrophilic surface-enhanced Raman scattering active substrate capable of rapid, on-site and real-time detection of substance traces. technical background [0002] Raman scattering spectroscopy has been widely used in many scientific research fields such as materials, physics, chemistry, and biology because of its unique and outstanding advantages such as fast, on-site, and real-time. The discovery of surface-enhanced Raman scattering (SERS) technology has greatly improved the sensitivity of Raman spectroscopy detection, which can amplify the Raman scattering signal of the detected substance by 10 3 ~10 6 times or even higher, enabling ultra-low concentration and trace detection, and even single-molecule detection. Therefore, surface-enhanced Raman scattering technology further increases the scientific research potential and appl...

AI Technical Summary

Problems solved by technology

The disadvantage is that the preparation of noble metal nanoarrays has high requirements on instruments and equipment, and usually requires electron beam etching, focused ion beam milling or magnetron sputtering, etc. The preparation process is more complicated and the preparation cost is higher.

Moreover, when the noble metal nanoarray is used for material detection, if the low-concentration solution is directly subjected to surface-enhanced Raman scattering detection, the probe molecules will still undergo thermal motion in the liquid environment, making it impossible for the excitation light to continuously and stably capture the probe molecules. , so that the surface-enhanced Raman scattering signal of the detected substance cannot be continuously and stably output, such as figure 2 shown

This unfavorable factor usually makes the quality of the collected surface-enhanced Raman scattering spectrum poor, and even the SERS signal of the detected substance cannot be effectively obtained. The probe molecular solution on the noble metal nanoarray is dried before the surface-enhanced Raman scattering spectrum can be collected

This shortcoming still makes the use of noble metal nanoarrays for surface-enhanced Raman scattering spectroscopy detection lose the outstanding advantage of rapid Raman detection, and in some cases also indirectly affects the on-site and real-time performance of detection.

[0008] To sum up, the most commonly used and most effective surface-enhanced Raman scattering detection methods today make Raman spectroscopy detection lose its outstanding advantage of "rapidity" that is different from many other modern analysis and testing technologies, and indirectly Affect the on-site and real-time performance of detection

However, other more sensitive Raman scattering enhancement methods such as TERS do not have fast, on-site and real-time characteristics at all.

Images