Design And Research Of Scanning Tunneling Microscope In Non-high Static Environment

Scanning tunneling microscopes have been widely used in various fields since their inception.However,the existing STM has limitations,and its resolution is so high that any small interference(such as sound,vibration,thermal drift,electrical fluctuations,etc.)will have a huge impact on its imaging,so almost all STM need to work in a highly static environment such as sound insulation,isolation,and thermal stability.However,the high static working environment and complicated operation limit its wider application space.Therefore,the high static environment and the wider application space are a pair of contradictions of STM.The breakthrough of high static environment is also a breakthrough in the field of STM applications.The high-rigidity STM developed in this paper can break through the limitations of high static environments and obtain atomic resolution images in harsh environments.This STM system is divided into three parts: the mirror body,the circuit and the control system.It is also the main work of this paper:(1)Highly rigid scanning tunneling microscope body designed and manufactured by itself.Through extensive analysis and comparison,our designed mirror body consists of a large thrust piezoelectric motor and a separate micro-scanning head.This structure is the key to STM’s ability to overcome the effects of non-high static environments to achieve atomic-level resolution images.It has the advantages of compact structure,small size,high thrust and high precision,and is suitable for various non-high static environments such as strong magnetic field,large noise and solution.After testing the mirror body,the atomic image of the graphite sample in the atmospheric environment was obtained,which confirmed the correctness of the design of the mirror structure.(2)The overall circuit of the scanning tunneling microscope designed and fabricated by itself.In order to cooperate with the self-made mirror body,we have designed the corresponding three-part circuit.In addition to the power supply circuit and the high-voltage drive circuit,there are also the most critical preamplifier circuits,which can achieve ultra-high current resolution.Our unique circuit design The method also greatly reduces the noise and leakage current interference of the circuit.(3)Control systems and software designed and developed by ourselves.In order to generate the special driving signal of the piezoelectric inertia motor in the mirror body.Built a controller on its own and developed a software that integrates motor stepping,scanning imaging,data storage and spectrum measurement functions according to the operating environment of the controller.