Submicron or micron monodisperse single crystal conductive gold ball and preparation method thereof

Abstract

The invention discloses a submicron or micron monodisperse single crystal conductive gold ball and a preparation method thereof. The preparation method comprises the following steps that a small-size monodisperse single crystal conductive gold ball colloidal solution is adopted as a seed solution; chloroauric acid and poly (diallyldimethylammonium chloride) are added into the seed solution, stirring is conducted at a room temperature for 2 hours, and reacting is conducted at 180 DEG C-200 DEG C for 1 hour-2 hours to prepare a single crystal gold nano octahedral colloidal solution; a polishing agent is added into the single crystal gold nano octahedron colloidal solution, and reacting is conducted at 100 DEG C for 5 hours to prepare a monodisperse single crystal conductive gold ball colloidal solution with the enlarged size; and the monodisperse single crystal conductive gold ball colloidal solution with the enlarged size is adopted as a seed solution, the above seed solution treatment step is executed again, and iteration is carried out until the size of the single crystal conductive gold ball reaches a preset requirement. The conductive gold ball is uniform in size and good in monodispersity, the preparation technology is simple and easy to operate, the requirement for instruments and equipment is low, and complex and expensive instruments do not need to be used.

Description

technical field [0001] The invention relates to the field of submicron or micron gold particles, in particular to a submicron or micron monodisperse single crystal conductive gold ball and a preparation method thereof. Background technique [0002] Conductive gold balls can be used for ultra-fine pitch circuit connections of precision electronic devices, and have been widely used in flat panel displays, hard disk drive heads, microwave high-frequency communications, memory modules, optical coupling devices, surface packaging and other fields, for example: in the field of liquid crystal display , because the chip is too small, the traditional pins cannot achieve circuit conduction, and the conductive gold ball replaces the solder, so it is called the bone of the liquid crystal display and the pin of the chip. However, conductive gold balls, as a "stuck neck" material, are monopolized by foreign companies. [0003] The size of conductive gold balls is only one-thirtieth of th...

AI Technical Summary

Problems solved by technology

At present, most of the preparation methods of gold spheres use the liquid phase reduction method with gold ions as the precursor, sodium citrate as the reducing agent, and surfactants as the stabilizer; this method can obtain monodisperse gold spheres, but its The size is often less than 150nm, and submicron and micron-sized gold balls cannot be produced, which cannot meet the needs of the industry

In order to obtain micron-sized gold spheres, researchers have recently developed a method for preparing conductive gold spheres of "full wet pulverization + plasma spheroidization", but the preparation process of this method is complicated, requiring high equipment and high energy consumption , thus increasing the production cost, which is not conducive to large-scale application

The electrochemical reduction method can prepare micron-sized gold nanoparticles, but the shape of the particles is polyhedral, and it is impossible to obtain high-quality conductive gold spheres

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