Rapid preparation method of AU@Cu2O nanocomposite in yolk-shell structure

Abstract

The invention relates to a rapid preparation method of an AU@Cu2O nanocomposite in a yolk-shell structure. According to the nano material, the coverage degree of a shell layer can be controlled by regulating parameters of concentration, temperature and the like of CTAB. The preparation method comprises the following main steps: (1) adding a certain quantity of Vitamin C in mixed liquor of CuSO4.5H2O and cetyl trimethylammonium bromide (CTAB), stirring, and dissolving; (2) adding 3ml of aqueous solution of gold octahedron in the solution; (3) keeping the solution for 20min at the temperature of 60 DEG C, and then adding a certain quantity of NaOH solution dropwise; and (4) carrying out centrifugation on the obtained product, washing precipitates with deionized water and ethanol for many times, and finally dispersing in an ethanol solution. The AU@Cu2O nano material in the yolk-shell structure has very important application value in the aspects of catalysis, surface-enhanced raman scattering (SERS) and the like.

Description

technical field [0001] The present invention relates to an AuCu with a hollow yolk-shell structure 2 A rapid preparation method for O nanocomposites. Background technique [0002] Nanocomposites with egg yolk-shell structure are a kind of core void shell nanomaterials with special hollow structure. Due to the special hollow structure of this core-shell nanomaterial, the contact area between the reactant and the core and shell materials can be increased, so that the respective characteristics of the core and shell nanomaterials can be fully utilized. Therefore, it is prepared from different materials. The yolk-shell nanocomposites can exhibit different characteristics, which make them have important application value in catalysis, chemical sensors, drug delivery, microreactors and other fields. The preparation methods of nanocomposites with egg yolk-eggshell structure generally include sacrificial template method, Ostwald ripening method, post-dipping method and selective e...

AI Technical Summary

Problems solved by technology

Although this method can successfully construct different yolk-eggshell nanostructures, its disadvantages are also obvious: first, the preparation method is relatively complicated, and the method requires at least three steps of coating-coating-emptying, and the process is relatively cumbersome Lengthy; secondly, the selection of the middle template layer also has strict requirements: the template cannot react with the core material and the shell material but can cover each other, and can be removed by a gentle method without damaging other substances; in addition, the outermost layer The shell must have a porous structure so that the template material in the middle can penetrate the shell and be removed during the dissolution process

However, the sacrificial template method in the preparation of AuCu 2 O egg yolk-eggshell structure has encountered some difficulties: the first difficulty is if the commonly used SiO 2 As a sacrificial template, ammonia water is usually used as a catalyst, and it can be combined with Cu 2 O forms unstable Cu(NH 3 ) 2 + complex ions and eventually destroy Cu 2 O shell structure; followed by dissolving SiO 2 The commonly used HF will also affect Cu 2 O has a dissolution effect; moreover, Cu 2 Cu in O + It is in an intermediate valence state, has poor stability, and is not easy to prepare hollow-structured nanomaterials by high-temperature curing.

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