High-efficiency automatic tungsten needle manufacturing device and method

Abstract

The invention discloses an automation high-efficiency direct-current-controlled dynamic manufacturing device and method of tungsten needles. In the device, an electrochemical reaction principle is adopted, a tungsten wire is driven by a linear motor to move up and down in NaOH corrosion liquid in a reciprocating manner so that a reaction is carried out between an anode tungsten wire and a cathode annular copper electrode, and the change of current in a circuit is monitored by utilizing a sampling resistor, a low-pass filter circuit, a voltage follower and a high-speed comparer; when the tungsten wire is corroded to be broken in an electrolyte solution, the sudden change of the current in the circuit causes an output signal of the comparer to change, a voltage applying circuit is switched off and a whole electrolytic corrosion process is finished; and furthermore, the conical degree and the tip radius of the tungsten needle can be adjusted by utilizing the change of motion speed of the linear motor. The device and the method, disclosed by the invention, have the characteristics of high automation degree of tungsten needle preparation, good repeatability and high efficiency.

Description

Technical field: [0001] The invention relates to the field of preparation of nano-tungsten needles, in particular to a method and device for preparing nano-tungsten needles by utilizing the idea of ​​automatic control and dynamic corrosion. Background technique: [0002] Tungsten needles, as a common probe, are widely used in nanotechnology-related fields, such as scanning tunneling microscopes, focused particle beam instruments, nanomanipulator probes and other instruments. Especially in the field of nano-testing that requires probes to have high hardness and high conductivity, such as nano-indentation, nano-wire extraction and performance testing, it is widely used. The quality of the tungsten needle tip is one of the main factors that determine the performance of the scanning tunneling microscope and the focused particle beam. The smaller the radius of curvature and the more symmetrical the shape of the tungsten probe tip, the higher the resolution and image quality. In...

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Problems solved by technology

[0006] For static corrosion, both the tungsten needle and the cathode remain static. When the tungsten needle is inserted into the electrolyte, the meniscus formed by the surface tension of the solution will affect the corrosion, and it is difficult to control the shape of the tungsten needle, the corrosion time, and the corrosion level; Dynamic corrosion, if piezoelectric ceramics are used, the cost is high, and because the lifting speed of the tungsten needle is very slow, the corrosion speed is slow, and the corrosion efficiency is not very high; if manual operation is used, the position of the tungsten needle cannot be adjusted due to the uneven lifting speed of the tungsten needle. System control will affect the macroscopic shape of the tungsten needle, resulting in low production efficiency

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