Flexible nanometer column array with top end coated with precious metal and preparation method and application thereof

Abstract

The invention discloses a flexible nanometer column array with the top end coated with precious metal and a preparation method and application thereof. The preparation method comprises: pouring a polymer solution in a duct of a single-pass aluminium oxide template; enabling the polymer solution to be cured and formed in the duct of the template; placing the aluminium oxide template after a pouredpolymer is formed in chloride solution of which the activity is lower than that of aluminium to soak for 5 to 10min, and removing an aluminium layer on the back of the template; placing the template after a polymer nanocolumn is placed in a pore and the aluminium layer on the back is removed into acid solution to etch off the aluminium oxide template so as to prepare a size-controllable flexible transparent nanocolumn array thin film; placing precious metal particles on one surface of a flexible transparent nanocolumn array in a mode of electron beam evaporation or magnetron sputtering so as to prepare the flexible nanocolumn array with the top end coated with precious metal. The flexible nanocolumn array and the preparation method are simple and convenient to operate and good in effect.

Description

technical field [0001] The invention relates to the preparation and application of periodic nanometer materials, in particular to the controllable preparation and application of a flexible nanocolumn array whose top is coated with noble metal, and belongs to the field of nanotechnology. Background technique [0002] In recent years, nanopillar array films have attracted widespread attention in the field of optical film preparation due to their unique anti-reflection effects, especially flexible polymer nanopillar arrays with high transparency and insulation, and are also gradually being used in the field of biocompatible materials. become a research hotspot. At present, the methods for preparing nanopillar arrays mainly include etching technology (including electron or ion beam etching), photolithography technology, and nanoimprinting technology, etc., but the required experimental costs are high and the operation is complicated, which is not universal. [0003] Surface-e...

AI Technical Summary

Problems solved by technology

Theoretical and experimental studies have shown that the SERS activity is strongly dependent on the nanoscale active sites in the substrate structure. These active sites are a strong guarantee for the generation of super-strong local electromagnetic fields, but the preparation of large-scale uniform and controllable active sites is still a challenge. a huge challenge

So far, many researchers have used silicon nanopore templates to prepare large-scale periodic nanostructures. Template preparation costs are high

In order to achieve a uniform gap below 10nm, many researchers have recently used atomic layer deposition to control the gap, but it is difficult for such a gap orientation to be at a zero-degree angle with the laser incident direction of the Raman spectrometer, which affects the local electromagnetic field. Effective excitation, because in the actual SERS signal detection process, the laser is generally incident on the surface of the SERS substrate from top to bottom, so we not only have to make a periodic noble metal structure with a gap below 10nm, but also consider these The orientation of the nanogap maximizes the enhancement of the local electromagnetic field

[0004] In addition, in the actual detection process based on the SERS substrate, the detected samples with various shapes will be encountered, which requires the SERS substrate to have a certain degree of flexibility; in addition, when detecting biological samples, in order not to destroy some measured samples The activity of the sample often requires the SERS substrate to have a certain biocompatibility. At present, there are not many reports on the flexible SERS active substrate with biocompatibility. This is also an urgent problem to be solved in the preparation of efficient SERS active substrates. question

Images