Gold nanotube array with gold and sliver nanowires built on surface and preparation method and application thereof

Abstract

The invention discloses a gold nanotube array with gold and sliver nanowires built on the surface and a preparation method and application thereof. The gold and sliver nanowires growing on the radial direction of each tube are built on the inner wall and the outer wall of each gold nanotube of the array, wherein the external diameter of each gold nanotube is 60-80 nm, the lengths of the gold and sliver nanowires are 6-10 nm, and the diameters of the wires are 3-6 nm. The method comprises the following steps: using an aluminum sheet to manufacture a through-hole alumina template with a two-step anodic oxidation method, carrying out evaporation deposition of gold film on one surface of the through-hole alumina template, then putting the through-hole alumina template into gold electrolyte for electro-deposition, and thus obtaining the alumina template which is coated with the gold film on one surface and provided with gold nanotubes in holes; removing the alumina template in an acid or alkali solution, and putting the gold nanotube array in mixed liquid of aniline and lauryl sodium sulfate for ultrasonic reaction; sequentially adding a chloroauric acid solution and a silver nitrate solution drop by drop in the mixed liquid subjected to the ultrasonic reaction, leaving to stand at the room temperature, and thus obtaining the target product. The target product can be used as an SERS substrate and is used for tract detection of organic pollutants.

Description

technical field [0001] The invention relates to a gold nanotube array, its preparation method and application, in particular to a gold nanotube array with gold and silver nanowires on its surface, its preparation method and application. Background technique [0002] Since the discovery of carbon nanotubes (CNTs), it has been found that nanotubes of other materials also have unique physical properties, so the synthesis of nanotubes of various materials has attracted people's attention. Among them, in addition to good electrical conductivity, excellent mechanical properties and optical properties, gold (Au) nanotubes can also produce surface-enhanced Raman scattering (SERS) effect through the interaction between free electrons on the surface and incident light. As a powerful tool for trace detection, SERS technology has high sensitivity and "fingerprint effect", and has broad application prospects in the fields of environment, chemistry, and biology. Recently, people have mad...

AI Technical Summary

Problems solved by technology

Both the gold nanotube array and its preparation method are unsatisfactory. First of all, although the gold nanotube array can be used as a SERS active substrate, its specific surface area is still relatively small, and the SERS activity of the precious metal gold is also low. is not the highest, which limits the further enhancement of the adsorption capacity and SERS activity of the molecules to be tested; secondly, the preparation method is too cumbersome, and it is impossible to prepare a SERS substrate with higher adsorption capacity and stronger SERS activity.

Images