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Moisture-sensitive sensor based on titanium-containing organic framework material and preparation method thereof

A metal-organic framework and moisture-sensitive sensor technology, applied in the direction of material impedance, etc., to achieve high specific surface area, good detection performance, and simple preparation methods

Inactive Publication Date: 2013-02-13
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few reports on the moisture-sensing properties of MOFs.

Method used

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  • Moisture-sensitive sensor based on titanium-containing organic framework material and preparation method thereof
  • Moisture-sensitive sensor based on titanium-containing organic framework material and preparation method thereof
  • Moisture-sensitive sensor based on titanium-containing organic framework material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] First, wipe the substrate with acetone and ethanol cotton balls until it is clean, then place the substrate in acetone, ethanol and deionized water in sequence, ultrasonically clean it for 5 minutes, and finally dry it at 100°C for later use;

[0031] Au metal interdigitated electrodes were prepared by screen printing technology. According to the ratio of ink: Au powder: diluent mass ratio of 1:1.5:3, the Au powder was stirred to make a paste; the paste was injected into the On the screen plate of the electrode pattern, the paste is scraped at a certain inclination angle (30°) and pressure (5 N), the electrode is printed and dried, and then cured by ultraviolet light, thereby completing the preparation of the metal interdigitated electrode.

[0032] Prepare MIL-125(Ti) by hydrothermal method: at room temperature, dissolve 0.5g terephthalic acid, 0.25mL titanium tetraisopropoxide in a mixed solution of 9mL N, N-dimethylformamide and 1mL ethanol , stirred evenly, then tra...

Embodiment 2

[0036] First, wipe the substrate with acetone and ethanol cotton balls until it is clean, then place the substrate in acetone, ethanol and deionized water in sequence, ultrasonically clean it for 5 minutes, and finally dry it at 100°C for later use;

[0037] The preparation process of the Au metal interdigitated electrode is the same as that in Example 1.

[0038] Preparation of MIL-125(Ti) by hydrothermal method: the experimental process is the same as in Example 1.

[0039] Put the prepared sensitive material into a mortar and grind thoroughly for 30 minutes. Then drop deionized water into the mortar (the mass ratio of sample to water is 5:1), and continue to grind for 30 minutes to obtain a viscous slurry; dip a small amount of sensitive film slurry with a medicine spoon, and apply it on On the substrate, the number of times of coating is 2 times, and then dried at 60°C to obtain an element with a sensitive film thickness of 3 μm. Place the above-prepared element in a hum...

Embodiment 3

[0042] First, wipe the substrate with acetone and ethanol cotton balls until it is clean, then place the substrate in acetone, ethanol and deionized water in sequence, ultrasonically clean it for 5 minutes, and finally dry it at 100°C for later use;

[0043] The preparation process of the Au metal interdigitated electrode is the same as that in Example 1.

[0044] Preparation of MIL-125(Ti) by hydrothermal method: the experimental process is the same as in Example 1.

[0045] Put the prepared sensitive material into a mortar and grind thoroughly for 30 minutes. Then drop deionized water into the mortar (the mass ratio of sample to water is 5:1), and continue to grind for 30 minutes to obtain a viscous slurry; dip a small amount of sensitive film slurry with a medicine spoon, and apply it on On the substrate, the number of coatings is 3 times, and then dried at 60° C. to obtain an element with a sensitive film thickness of 4 μm. Place the above-prepared element in a humidity ...

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Abstract

The invention particularly relates to a titanium-containing organic framework material MIL-125 (Ti) moisture-sensitive sensor and a preparation method thereof. The preparation method comprises the following steps of: firstly, utilizing a silk screen print method to prepare an Au metal inter-digital electrode on a ceramic substrate; utilizing a hydrothermal method to prepare an MIL-125 (Ti) sensitive material; and utilizing a coating method to coat the sensitive material on the metal inter-digital electrode to prepare a moisture-sensitive element. The adopted testing humidity range is 33-100% of RH (Relative Humidity), the adopted testing voltage is 1 V and the frequency is 100 Hz. The MIL-125 (Ti) moisture-sensitive sensor prepared by the preparation method has the advantages of simple preparation process, small device volume, suitableness for large-batch production, higher sensitivity to humidity, smaller humidity hysteresis and faster responding time; and the moisture-sensitive sensor has the huge application value on the aspect of moisture-sensitive detection.

Description

technical field [0001] The invention belongs to the technical field of humidity sensors, and in particular relates to a humidity sensor based on a titanium-containing metal organic framework (MOF) with MIL-125 (Ti) as a humidity sensitive material and Au as a metal interdigital electrode and its preparation method. Background technique [0002] Humidity is closely related to people's life and industrial production. In human life, if the air is too humid, it will make people feel dull, and if the air is too dry, it will make people's skin feel uncomfortable and cause diseases. Therefore, instruments should be used to detect and control the humidity in the room; in industrial production, the control of humidity is directly related to the quality of the product; in addition, the storage of grain, high-altitude weather detection, and greenhouse planting are also inseparable from humidity detection. [0003] The humidity sensor uses humidity-sensitive materials to directly abso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/02
Inventor 刘彩霞张莹阮圣平张宇鹏沈亮温善鹏郭文滨董玮李伟张晶晶
Owner JILIN UNIV
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