Nickel nanorod-nickel oxide nanosheet hierarchical structure array modified with silver nanoparticles and preparation method and application thereof

Abstract

The invention discloses a nickel nanorod-nickel oxide nanosheet hierarchical structure array modified with silver nanoparticles and a preparation method and application thereof. The array is a nickel nanorod array which consists of conical top-outcropped nickel nanorods and nickel oxide nanosheets attached onto the nickel nanorods, wherein the nickel nanorod array is located on an alumina template, and the surfaces of the nickel nanorods are all modified with the silver nanoparticles. The method comprises the following steps of: firstly carrying out secondary anodic oxidation, reaming and one-side silver film plating on an aluminum sheet; electrodepositing the aluminum sheet in a nickel electrolyte, and then, chemically removing a silver film, so as to obtain the alumina template, in which nickel nanorod arrays are placed; floating the alumina template on the surface of alkaline liquid, and then, soaking the alumina template in concentrated ammonia, so as to obtain the nickel nanorod array which is located on the alumina template, wherein nickel hydroxide nanosheets are attached onto the conical top-outcropped nickel nanorods of the nickel nanorod array; and calcining the nickel nanorod array, and then, sputtering the silver nanoparticles on the surface of the nickel nanorod array, thereby producing a target product. The nickel nanorod-nickel oxide nanosheet hierarchical structure array modified with the silver nanoparticles can serve as a surface-enhanced Raman scattering active substrate, and the content of rhodamine or tetrachlorobiphenyl attached onto the nickel nanorod-nickel oxide nanosheet hierarchical structure array is measured by using a laser Raman spectrometer.

Description

technical field [0001] The invention relates to a hierarchical structure array, its preparation method and application, in particular to a silver nanoparticle-modified nickel nanocolumn-nickel oxide nanosheet hierarchical structure array, its preparation method and application. Background technique [0002] The transition metal nickel has magnetism and good plasticity, as well as good corrosion resistance. Nano-nickel has attracted more and more attention because of its large specific surface area and excellent properties in many aspects. At present, people have made unremitting efforts to obtain nano-nickel materials, such as a "metallic nickel nanotube and its preparation method" announced on December 10, 2008 in the Chinese invention patent specification CN100441348C. The outer diameter of the metal nickel nanotubes recorded in this manual is 15-150 nanometers; the preparation method first uses the sensitized and activated anodized aluminum porous template as the cathode...

AI Technical Summary

Problems solved by technology

However, there are deficiencies in both the product and its preparation method. First, although nickel nanotubes have unknown specific uses, it is difficult to use them as active substrates for surface-enhanced Raman scattering (SERS) to rapidly and sensitively detect Identify the fingerprint feature information of the molecule to be tested; secondly, the preparation method cannot obtain a nickel nanostructure substrate with high SERS activity

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