Preparation method of ultra-thin metal nanosheets

Abstract

The invention relates to a preparation method of ultra-thin metal nanosheets. The preparation method for metal nanosheets is used for preparing ultrathin metal nanosheets with special appearances on the basis of using a magnetron sputtering or thermal evaporation or other deposition film forming technology, a film stripping process, an ultrasonic technique and the like. The preparation method comprises the following steps: step 1, a plurality of polymer films with nanometers thicknesses are coated on the surface of a substrate, and then heat curing or photocuring is performed on the coated polymer films; step 2, a plurality of metal films with nanometers thicknesses are formed on the surface of the polymer films through sputtering by using a magnetron sputtering, or thermal evaporation or other deposition film forming technology; step 3, the substrate with the nano metal film formed through sputtering is soaked in resolvent, and since the polymer films are resolved through resolvent, the nano metal film layer drops off the surface of the substrate; and step 4, ultrasonic processing is performed on the dropped off the nano metal films in the resolvent, so that the metal nanosheets formed by metal nano particle arrays comprising stably connected ultra-thin metal films formed by metal atoms with a plurality of nanometers thick are formed.

Description

technical field [0001] The invention belongs to the technical field of preparation of noble metal or other metal nanoparticles, in particular to a nanosheet composed of nanoparticle arrays stably connected by an ultrathin metal film and a preparation method thereof. Background technique [0002] Noble metal nanoparticles have a significant optical localization enhancement effect due to the surface plasmon resonance effect in the visible light band. These noble metal nanoparticles also have good stability and low biological toxicity. Therefore, in biological imaging and sensing, surface enhanced Raman scattering detection , Photocatalysis, photovoltaic devices and optoelectronic integrated devices have important applications. At present, there are a variety of preparation strategies for noble metal nanostructures, among which noble metal nanorods, nanosheets, polyhedrons, hollow shells and other nanostructures have been synthesized by the polyhydric process, and their tunable...

AI Technical Summary

Problems solved by technology

However, the currently reported technology mainly uses organic molecules, DNA or other materials to link nanoparticles together. The linked nanoparticles are dynamic and unstable, and their surface plasmon resonance coupling effect is very weak, and this This kind of dynamic and unstable interconnected nanoparticle array is not conducive to the preparation of nanofunctional devices, thus limiting its application in the fields of integrated optics, optoelectronic integrated devices, etc.

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