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Controlled method of preparing metal nano particle

A technology of metal nanoparticles and metal thin films, applied in the field of controllable preparation of nanoparticles, can solve the problems of time-consuming, expensive, unsuitable for large-scale production, etc., and achieve the effect of simple production process and low cost

Inactive Publication Date: 2007-08-08
SUN YAT SEN UNIV
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Problems solved by technology

Among them, the electron beam exposure method can accurately control the diameter and distribution of the formed nanoparticles, but it is expensive and time-consuming, so it is not suitable for large-scale production; Can not adapt to large-area preparation and other shortcomings and cannot be widely used

Method used

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  • Controlled method of preparing metal nano particle
  • Controlled method of preparing metal nano particle
  • Controlled method of preparing metal nano particle

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Embodiment Construction

[0027] Generally speaking, the melting point of a metal bulk structure is relatively high, and its melting point will drop significantly as the size shrinks. For example, the melting point of a gold block is 1064°C, but when its size is reduced to 2nm, the melting point also drops. It is 227°C. It can be seen that the melting point of nanoscale metals is much lower than that of bulk structures. Based on this principle, the present invention adopts the method of heat-treating the metal film at a temperature far lower than the melting point of the metal to make it melt rapidly to obtain metal nanoparticles. First, a uniform metal film is obtained on a substrate with a flat surface by coating technology, and then Under the protection of an inert gas, the metal thin film is heat-treated, and the metal particles are melted into dispersed droplets by continuing heating under a hydrogen atmosphere, and finally cooled to room temperature under the protection of an inert gas to form me...

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Abstract

The controllable way of making metal nanometer grains features in using film coating technique to deposit a even thickness layer of metal coating on the liner surface, heat treating the liner in inert atmosphere to rise the temperature, turning off the inert gas to introduce hydrogen for further heating, smelting the metal thin film into scatter small drops, turning off hydrogen and stopping heating, with inert gas in to cool to normal temperature. It is simple in process, low in cost, feasible of making big area of metal nanometer grain.

Description

technical field [0001] The invention relates to the technical field of design and manufacture of nanometer materials, in particular to a method for controllably preparing nanoparticles. Background technique [0002] Due to their special photoelectric and catalytic properties, metal nanoparticles are widely used in various fields. For example, in the preparation of one-dimensional nanomaterials, metal nanoparticles are often used as catalysts or etching masks. In the process of using metal nanoparticles to prepare one-dimensional nanomaterials, the diameter of the formed one-dimensional nanomaterials depends on the diameter of the nanoparticles, so if the diameter of the nanoparticles can be controlled, a one-dimensional nanomaterial array with controllable diameter can be obtained . At present, the methods for preparing metal nanoparticle arrays mainly include electron beam exposure method, template method, colloidal crystal etching method and so on. Among them, the electr...

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Application Information

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IPC IPC(8): B22F9/04
Inventor 许宁生姚日晖佘俊聪邓少芝陈军
Owner SUN YAT SEN UNIV