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Compound microprobe for in-situ measurement of STM image and chloride ion concentration distribution and preparation method thereof

A technology for in-situ measurement of chloride ion concentration, applied in measurement devices, scanning probe technology, scanning probe microscopy, etc., to achieve the effects of high sensitivity, good practicability, and simple process operation

Inactive Publication Date: 2014-11-19
XIAMEN LE GANG MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no report about the composite microprobe preparation technology that can simultaneously measure the metal surface STM image and the chloride ion concentration distribution in situ at home and abroad.

Method used

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  • Compound microprobe for in-situ measurement of STM image and chloride ion concentration distribution and preparation method thereof
  • Compound microprobe for in-situ measurement of STM image and chloride ion concentration distribution and preparation method thereof
  • Compound microprobe for in-situ measurement of STM image and chloride ion concentration distribution and preparation method thereof

Examples

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preparation example Construction

[0047] In the preparation process of the composite microprobe of the present invention, the characteristics of the glass tube to facilitate the drawing of small diameters are skillfully utilized, and the drawing method is used to prepare the glass capillary, and then the Pt wire and the Ag wire are put into the glass capillary, and the The tip of the Pt wire and Ag wire can be polished to a very small size, especially the tip of the Pt wire, so that the Pt wire has the characteristics of sensitive tunnel current, so as to realize the in-situ measurement of the metal surface STM image and chloride ion concentration distribution.

[0048] figure 2 The STM-assisted scanning microelectrode measurement system is shown, which consists of four parts: scanning tunneling microscope (STM) measurement platform; scanning microprobe and control / drive unit; tunnel current signal and micro-area potential signal measurement unit and measurement Signal control and processing unit. The STM m...

example 1

[0053] Take Pt wire (99.9% purity) and Ag wire (99.9% purity) with a cross-sectional diameter of 10 μm and a length of 3 cm and clean them; take a double-tube glass tube with a wall thickness of 100 μm between the two tubes, and use 30% The mixture of H2O2 and concentrated sulfuric acid in a ratio of 1:4 was cleaned and dried in an oven; the treated double-tube glass tube was stretched with a glass tube stretcher to prepare a glass containing two glass capillaries with a tip inner diameter of 10 μm tube; put Pt wire and Ag wire into the tips of two glass capillaries respectively, so that the tip positions are respectively encapsulated with a section of Pt wire and Ag wire, and encapsulated and fixed with epoxy resin, wherein the parallel distance between Pt wire and Ag wire is 30 μm ;After the resin is completely cured, the tip of the glass capillary is ground into a 30-degree cone surface by a glass grinder, so that the tips of the Pt wire and the Ag wire are fully exposed, an...

example 2

[0055] Take Pt wire (99.9% purity) and Ag wire (99.9% purity) with a cross-sectional diameter of 20 μm and a length of 4 cm and clean them; take a double-tube glass tube with a wall thickness of 150 μm between the two tubes, and use 30% H2O2 Wash the mixed solution mixed with concentrated sulfuric acid in a ratio of 1:4, and dry it in an oven; stretch the treated double-tube glass tube with a glass tube stretcher to prepare a glass tube containing two glass capillaries with a tip inner diameter of 10 μm ;Put the Pt wire and the Ag wire into the tip positions of two glass capillaries respectively, so that the tip positions are respectively encapsulated with a section of Pt wire and Ag wire, and encapsulated and fixed with epoxy resin, wherein the parallel distance between the Pt wire and the Ag wire is 40 μm; After the resin is completely cured, the tip of the glass capillary is ground into a cone with an angle of about 45 degrees by a glass grinder, so that the tips of the Pt w...

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Abstract

The invention discloses a compound microprobe for in-situ measurement of STM image and chloride ion concentration distribution. The compound microprobe consists of a Pt microelectrode and an Ag microelectrode placed in parallel in double-tube glass tube to form the double electrodes. An end pipeline of the double-tube glass tube envelops segments of the Pt microelectrode and the Ag microelectrode by drawing. A tip of the double tube glass tube is grinded into a cone surface of 30 to 60 degrees. The tip surface of the Pt microelectrode and the tip surface of the Ag electrode are both exposed on the cone surface and the Ag microelectrode is located above the Pt microelectrode. The surface of the tip end of the Ag microelectrode forms an Ag or AgCl end surface by chlorination. The invention also provides a method of preparing the compound microprobe. The compound microprobe is high in measuring accuracy and easy to use, and has the functions of STM image scanning and micro-area two-dimensional chloride ion distribution measurement.

Description

technical field [0001] The invention relates to a composite microprobe and a preparation method thereof, which are used in a Scanning Microelectrode Measurement (SMET) system assisted by a Scanning Tunneling Microscope (STM) to simultaneously measure the STM image of a metal surface and the concentration distribution of chloride ions in situ. Background technique [0002] The local destruction of metal passivation film and various forms of local corrosion induced by it, such as pitting corrosion, crevice corrosion and stress corrosion cracking, are closely related to the distribution of chloride ions on the surface and the behavior of interface micro-regions. A variety of models about the mechanism of pitting corrosion that have been proposed so far are recognized as chloride ions are the most critical inducing factor of localized corrosion. Therefore, the development of chloride ion microsensor technology and the in situ measurement of the concentration distribution of chlo...

Claims

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Application Information

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IPC IPC(8): G01Q60/16G01N27/30
Inventor 林昌健林理文温力熊
Owner XIAMEN LE GANG MATERIALS TECH
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