A Scanning Tunneling Microscope Needle Corrosion Instrument

Abstract

The invention discloses a scanning tunneling microscope needle point corrosion instrument which comprises a mechanical component, a working circuit and a control power source. The control power source comprises a control circuit and a control panel. The control circuit comprises a voltage regulating and stabilizing module, a voltage measuring module, a current measuring module, a threshold value setting module, a sampling comparison module and a voltage output module. A sampling resistor R2 adopted by the voltage regulating and stabilizing module is located at a high-potential position, and an LM319 type comparator is adopted by the sampling comparison module. Due to the facts that a sampling resistor in a control circuit of an original needle point corrosion instrument is moved away from a whole load voltage collecting system according to the design control circuit of the scanning tunneling microscope needle point corrosion instrument, and the sampling resistor is changed to be located at the high-potential position, real-time current can be precisely measured, constant-voltage output at the two ends of a load resistor is guaranteed, current is gradually reduced along with increasing of load resistance, single-parameter changing is easy to control and analyze, stability in the corrosion process is improved, and the manufacturing successful rate of needle points is improved.

Description

technical field [0001] The invention relates to a scanning tunneling microscope needlepoint manufacturing device, in particular to a scanning tunneling microscope needlepoint erosion instrument. Background technique [0002] The scanning tunneling microscope (STM) is a very high-resolution surface research instrument, which allows people to observe atoms in real space for the first time. In recent years, with the development of surface science, it has been widely used, and has gradually become a necessary research method for condensed matter and surface physics laboratories. As a component in direct contact with the research surface, the needle tip plays an extremely important role in the various components of the STM. For most STM experiments, the commonly used tip materials are tungsten W or platinum-iridium Pt-Ir, and the quality of the tip directly affects the resolution of STM. [0003] Due to the requirement of high-quality tips for scanning probe microscopy, various...

AI Technical Summary

Problems solved by technology

The main disadvantage of this method is that if the circuit cannot be cut off in time, it will continue to react and cause the needle tip to become blunt. Therefore, it is necessary to design an automatic power-off circuit system to meet its requirements.

The corrosion voltage, load resistance and corrosion current of the circuit system designed by the traditional needle point corrosion instrument will all change. The uncertainty and continuous change of multiple reaction parameters will increase the difficulty of experimental control, resulting in the instability of experimental results and reducing Success Rate of Needle Tip Fabrication

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