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Preparation method and application of miniature pH sensor

A sensor and sensing electrode technology, applied in the field of electrochemical detection, can solve the problems of tip impurities blocking the air port, limiting the application range of electrodes, etc., achieving good specificity and stability, high sensitivity and accuracy, and good robustness sexual effect

Active Publication Date: 2020-03-27
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current ion-transport pH sensors based on artificial solid-state pores exist at the nanoscale, and the tips are very fragile and easily blocked by impurities, which limits the application range of this type of electrode.

Method used

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  • Preparation method and application of miniature pH sensor
  • Preparation method and application of miniature pH sensor
  • Preparation method and application of miniature pH sensor

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preparation example Construction

[0050] The invention discloses a preparation method and application of a miniature pH sensor. Compared with the traditional electrochemical detection method, the present invention has the advantages of high time resolution and high stability compared with the traditional rectification voltammetry, and the electrode size is micron order. And the combination of the modified conical hole electrode and various electrochemical instruments can be applied to online analysis and detection in complex environments such as environment, physiology, pathology or cells.

[0051] The principle of the detection and analysis method of a kind of miniature pH sensor provided by the invention is as follows:

[0052] The model provided by the present invention takes the ion transport principle in the micropore as a model, and the micropore after the inner wall modification changes in the pH of the electrolyte solution outside the hole, and the H + Then it enters the tube and combines with the pol...

Embodiment

[0063] 1. Preparation of glass nanotubes used

[0064] Borosilicate glass tube (outer diameter 1.50mm, inner diameter 1.10mm, length 10cm), using CO 2 The laser puller adopts the following procedures to obtain glass nanotubes with an average size of 300 nm:

[0065] (Cycle 1) heat=320, filament=5, velocity=20, delay=128, pull=50;

[0066] (Cycle 2) heat=350, filament=4, velocity=15, delay=130, pull=175.

[0067] The drawn glass tube was polished to a diameter of 10 microns under a polishing machine.

[0068]Then, a 5% solution of 2-bromo-2-methyl-N-[3-(triethoxysilyl)propyl]propanamide in acetonitrile was added to the tip of the electrode and left overnight. Next, the electrode is cleaned successively with acetonitrile, ethanol, and water to obtain a glass microtube electrode with an initiator on the surface. In the next step, 1 mL of N-vinylimidazole was added to 10 mL of deionized water and placed in a three-necked flask for deoxygenation for 30 min. Put cuprous bromide...

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Abstract

The invention relates to a preparation method and application of a miniature pH sensor, and particularly provides a sensing electrode. The sensing electrode comprises: a glass capillary tube with openings at two ends; and an electrochemical probe, wherein the electrochemical probe is modified on the inner wall of the opening in one end of the glass capillary tube, and the diameter of an opening atone end of the glass capillary tube modified with the electrochemical probe is 8-12 microns. The sensing electrode can realize ion regulation and control in a micron pore passage, further realizes high-sensitivity detection of a to-be-detected substance (such as hydrogen ions), has good robustness, and can be combined with various electrochemical instruments for use, so that the sensing electrodeis used for on-line analysis and detection in complex environments such as environments, physiology, pathology or cells.

Description

technical field [0001] The invention relates to the field of electrochemical detection, in particular, the invention relates to a preparation method and application of a miniature pH sensor. Background technique [0002] The pH value is one of the important physical and chemical parameters of the solution. pH measurement is of great significance in many fields such as industry, agriculture, medicine, environment, chemistry, life science, etc. Therefore, the pH value in the solution can be obtained quickly and accurately in real time It has great significance and wide application. The common pH detection methods are pH test paper and pH glass electrode. Although pH test paper can be used conveniently in daily life, individual differences in human eyes limit the use of test paper for color discrimination errors. Although the pH glass electrode has a more precise and accurate pH value, the electrode size is large and difficult to miniaturize, which limits its application rang...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30G01N27/48A61B5/1473A61B5/145
CPCA61B5/14539A61B5/1473G01N27/302G01N27/48
Inventor 毛兰群张凯林于萍
Owner INST OF CHEM CHINESE ACAD OF SCI
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