Preparation method of polyvinyl alcohol composite film with embedded silver-wrapped nanoparticles

Abstract

The invention discloses a preparation method of a polyvinyl alcohol composite film with embedded silver-wrapped nanoparticles, comprising the following steps: (1) preparing a polyvinyl alcohol-silver nitrate solution; (2)preparing a polyvinyl alcohol-silver nitrate film by using spin coating method or casting film method; and (3) irradiating the polyvinyl alcohol-silver nitrate film with ultraviolet light. The prepared composite film has the characteristics of uniform metal nanoparticle size distribution, controllable dimension, uniform shape, and uniform dispersion.

Description

technical field [0001] The invention relates to the fields of polymer-metal nanoparticle composite material, photochemistry, optical storage, biological antibacterial and the like, and is a composite material preparation method for preparing metal nanoparticle by an ultraviolet light reduction method. Background technique [0002] Polymer / metallic silver nanocomposites combine the properties of metal nanoparticles and the processability of polymers, opening up a new path for the development of nanocomposite systems with advanced and novel properties. Generally, there are two preparation techniques for such composite materials: in situ and ex situ. In the ex situ technology, the polymerization of polymer monomers and the nucleation of metal nanoparticles are carried out separately, and then the nanocomposites are realized by mechanical mixing. In situ technology, metal nanoparticles are generated in a polymer matrix by decomposition (photoreduction, radiation reduction, ther...

AI Technical Summary

Problems solved by technology

The nanoparticles formed by this method have a wide size distribution, uneven particle dispersion, and the surface of the nanoparticles is easily passivated by surfactants or oxide layers, making it difficult to achieve a high degree of uniformity in polymer-metal nanoparticle mixing (see article Gamma-irradiation assisted seeded growth of Ag nanoparticles within PVA matrix, Materials Chemistry and Physics 128(2011)109-113)

At the same time, the use of chemical reducing agents is likely to cause unnecessary side reactions, and may even deteriorate the mechanical properties of the polymer matrix.

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