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Electrochemical probe type humidity sensor

A humidity sensor, electrochemical technology, applied in the field of electrochemistry

Inactive Publication Date: 2007-10-24
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there is no similar report on the use of electrochemical means to make electrochemical probe type humidity sensors based on the unique physical and chemical properties of ionic liquids and redox couples dissolved in them.

Method used

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  • Electrochemical probe type humidity sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Preparation of 1-ethyl-3-methylimidazolium bromide

[0045] Under room temperature and stirring conditions, 9.1ml of bromoethane (0.126mol) was slowly added dropwise to 10ml of N-methylimidazole. After 24h, it was washed with ethyl acetate three times, filtered, and vacuum-dried. Reaction equation:

[0046]

Embodiment 2

[0048] Preparation of [1-ethyl-3-methylimidazole][tetrafluoroboric acid] ionic liquid

[0049] Under the conditions of room temperature and rapid stirring, the HBF 4 Acid (15.2cm 3 0.116mol) Slowly add Ag 2 O slurry (13.49g 0.058mol Ag 2 O dissolved in 50cm 3 water), stir quickly. The reaction vessel was wrapped with aluminum foil to prevent light fall. Stir for another 1 h until Ag 2 O reacted completely to give a colorless solution. Add 22.24g 0.116mol of 1-ethyl-3-methylimidazolium inner salt obtained in Example 1, stir at room temperature for 2h, filter and separate. At 70°C, vacuum-dried, the product was a colorless liquid. The reaction equation is:

[0050]

Embodiment 3

[0052] Preparation of 1-butyl-3-methylimidazolium bromide

[0053] Under stirring at room temperature, slowly drop 6.46ml of n-bromobutane (0.06mol) into 4.76ml of N-methylimidazole. After 24h, wash with ethyl acetate three times. Filter and dry in vacuo. The reaction equation is:

[0054]

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Abstract

The invention relates to an electrochemical probe humidity sensor and a relative production, which comprises a humidity sensitive material with room temperature ion liquid, at least two electrodes, an electrochemical probe containing an oxidization reduction couple, a power supply, a current meter and a signal circuit. The oxidization reduction couple is dissolved in ion liquid, with reversible process. The invention is characterized in that the invention uses room temperature ion liquid as the sensitive film of humidity, which has dissolved reversal oxidization reduction couple as the electrochemical probe. The invention uses the cooperation of water molecule and room temperature ion liquid film, to affect the electrochemical reaction current of the oxidization reduction couple to realize humidity detection. The inventive humidity sensor has stable property, high sensitivity, simple structure and low cost or the like.

Description

technical field [0001] The invention belongs to the field of electrochemical technology, in particular to an electrochemical probe type humidity sensor and a manufacturing method thereof. Background technique [0002] Humidity not only plays an important role in industrial production, quality management, and environmental control, but also is a physical quantity closely related to our human life. In the field of humidity measurement, the humidity sensor is manufactured on the basis that its functional materials can produce physical or chemical effects related to humidity, and it has the function of converting the physical quantity of humidity into a measurable electrical signal. According to the sensing principle, it includes capacitive humidity sensor (CN1220393A), resistive humidity sensor (CN1431489A), optical fiber humidity sensor (CN1036635A), and weight type resonance method, microwave method, thermoelectric method, etc.; according to the principle of humidity sensitiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/403G01N27/26
Inventor 王荣朱国阳
Owner SHANGHAI NORMAL UNIVERSITY
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