Method and device for preparing boron-doped nano silicon material

Abstract

The invention discloses a method and a device for preparing a boron-doped nano silicon material. The method comprises the following steps of: placing a rod-like raw material serving as an electrode raw material in a spark discharge chamber; applying a voltage to the electrode raw material by using a pulse power supply and generating sparks under the protection of a dielectric gas or liquid material; partially melting and gasifying the electrode raw material; injecting the molten and gasified electrode raw material into a dielectric gas or liquid to form nanoparticles; and separating and collecting the nanoparticles by using a filter cloth-containing particle collection device. By the method and the device provided by the invention, the spark discharge area of the electrode raw material can be improved, so that the capacity for preparing the nanoparticles is improved; the requirement on scale production is met; and the distance among electrode raw materials can be controlled so as to control the size of the formed nanoparticles and improve the particle size distribution uniformity.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and in particular relates to a device and method for preparing boron-doped nano-silicon materials by using a controllable spark discharge method. Background technique [0002] Nanoparticles, especially semiconductor nanoparticles, such as silicon nanoparticles, have a very wide range of applications in the fields of electronics, optoelectronics, solar energy and biomedicine. For example, as the anode material of lithium battery, silicon nanoparticles can store up to 4.4 lithium atoms per silicon atom, enabling the storage capacity to reach 4200mAHg -1 Theoretical value, much higher than the storage capacity of the current graphite anode 370mAHg -1 . For another example, the printed electronic ink based on silicon nanoparticles has gradually changed the preparation process of semiconductor devices, solar devices, optical, electrical, magnetic and various biomedical sensor devices, from tra...

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Problems solved by technology

It is characterized by low cost and high yield, but it is difficult to avoid cross-contamination of various chemical components in the synthesis process

[0006] The commonly used spark discharge method to prepare nanoparticles cannot control the distance between the electrode raw materials, which leads to the inability to control the spark discharge process, making the prepared nanoparticles uneven in size, most of the prepared particles are in the micron range, and the actual nanoparticle production capacity not tall

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