Electrochemical detection method through partial morphology scanning

A detection method and local area technology, applied in the field of electrochemical testing, can solve the problems of difficult feedback current density signal, single detection signal, weak signal, etc.

Inactive Publication Date: 2014-09-10
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Abstract
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide an electrochemical detection method for local area morphology scanning, which overcomes the shortcomings of conventional scanning electrochemical microscopes such as weak signals, difficulty in obtaini

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  • Electrochemical detection method through partial morphology scanning
  • Electrochemical detection method through partial morphology scanning
  • Electrochemical detection method through partial morphology scanning

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Embodiment 1

[0074] Such as figure 1 As shown, the electrochemical test device includes: (1) double potentiostat, (2) probe signal receiving device, (3) lock-in amplifier, (4) sample signal collector, (5) electrolytic cell leveling knob , (6) test probe, (7) sample fixing platform, (8) test sample, (9) reference electrode, (10) test electrolytic cell, (11) electrolytic cell upper cover, (12) counter electrode. Among them, (2) the probe signal receiving device also includes a three-dimensional stepping motor and a piezoelectric ceramic sensor, (6) the test probe can use platinum disk electrodes (Pt purity > 99.9%) and gold disk electrodes (Au purity > 99.9%), (9) The reference electrode is an Ag / AgCl electrode. The equivalent circuit diagram of the test sample is shown in figure 2 As shown, the test probes were cleaned in acetone, alcohol, and ultrapure water in sequence for 30 minutes, then rinsed thoroughly with ultrapure water, and dried with nitrogen or argon. The sample to be teste...

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Abstract

The invention provides an electrochemical detection method through partial morphology scanning by using an electrochemical detection device. The method comprises the following steps: performing rapid and long-distance control on a probe through a three-dimensional stepper motor, performing short-distance precise control through a piezoelectric ceramic sensor, keeping constant potential on a tested sample through a double-constant potential rectifier, meanwhile externally exerting an alternating current potential signal onto the testing probe, acquiring imaging information of three-dimensional spatial distribution of the electrochemical signal such as real part Zre, imaginary part -Zim, an absolute module value Z and a phase angle -Phase of a sample partial area through a data acquisition module, and acquiring element parameter information of an equivalent circuit. By adopting the method, the defects that a conventional scanning electrochemical microscope is weak in signal, hard in obtaining a feedback current density signal, single in detection signal and the like are overcome, partial microcosmic impedance distribution characteristics of the surface of a sample can be obtained, the information is rich, and the real characteristics of the sample can be studied and analyzed.

Description

technical field [0001] The invention relates to the technical field of electrochemical testing, in particular to an electrochemical detection method of local area morphology scanning. Background technique [0002] There are many local and microscopic image scanning methods, such as atomic force microscope (AFM), scanning tunneling microscope (STM), profilometer, scanning electrochemical microscope (SECM) and so on. In response to the harsh requirements under special research conditions, researchers combined atomic force microscopy with scanning electrochemical microscopy, atomic force microscopy and infrared spectroscopy, etc. The combination of technical means has significantly expanded the application fields of these local scanning technologies. Among them, scanning electrochemical microscopy, which is mainly used in the field of electrochemistry, has become one of the necessary means to characterize the microscopic surface reactions and kinetic properties of substances af...

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Application Information

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IPC IPC(8): G01N27/26G01B7/28
Inventor 王巍许立坤隋永强李相波闫永贵
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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