A micro-current detection device for single-molecule conductance measurement system

A conductance measurement and detection device technology, applied to measuring devices, using digital measurement technology to measure, changing range circuits, etc., can solve problems such as conductance changes, and achieve good linearity, high sensitivity, and large dynamic range.
CN104655920BActive Publication Date: 2017-12-01ZHEJIANG NORMAL UNIVERSITY
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Patents(China)
Current Assignee / Owner
ZHEJIANG NORMAL UNIVERSITY
Publication Date
2017-12-01

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Abstract

The invention relates to a micro-current detection device, in particular to a micro-current detection device for a single-molecule conductance measurement system. The micro-current detection device is provided with a see-saw circuit, a four-section current-voltage conversion circuit, pre-filter circuits, in-phase amplifying circuits, post-filter circuits and an optoelectronic isolation ADC acquisition card, wherein the four-section current-voltage conversion circuit is circumscribed with a shielded input tunnel current signal; the four-section current-voltage conversion circuit is output to an STM controller through the see-saw circuit to be used for imaging control; 4 paths of voltage signals of the four-section current-voltage conversion circuit after being subjected to current-voltage conversion sequentially pass through the pre-filter circuits, the in-phase amplifying circuits, the post-filter circuits and the four-channel optoelectronic isolation ADC data acquisition card clamped with an input port of a PC; the PC automatically judges the present current value calculated by selecting a voltage result at the same time through software. The micro-current detection device is wide in measuring range, self-adaptive, high in sensitivity, large in dynamic range and high in linearity.
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Description

technical field

[0001] The invention relates to a micro-current detection device, in particular to a micro-current detection device for a single-molecule conductance measurement system which is mainly applied to but not limited to a scanning tunneling microscope molecular conductance measurement system. Background technique

[0002] With the development of split junction metal quantum conductance and single molecular junction conductance detection technologies such as scanning tunneling microscope split junction (STM-BJ) technology and mechanically controlled split junction (MCBJ) technology, researchers have begun to use this method to detect metal atoms Line conductance and single-molecule junction conductance, among which the scanning tunneling microscope split junction method (STM-BJ) is the most widely used. Usually, the scanning tunneling microscope molecular conductance measurement system is realized by transforming the commercialized scanning tunneling microscope: dr...

Claims

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