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Preparation method of gas sensor based on metal phthalocyanine and use method of gas sensor

A gas sensor and metal phthalocyanine technology, applied in the field of preparation of gas sensors, can solve the problems of inability to detect at room temperature, slow response and recovery speed, etc., and achieve the effects of improving gas sensor response speed, recovery speed, and synthesis speed.

Active Publication Date: 2018-08-03
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the shortcomings of the prior art described above, the object of the present invention is to provide a method for preparing a gas sensor based on metal phthalocyanine and a method of use thereof, for solving the problem of response and recovery speed of the metal phthalocyanine gas sensor in the prior art Slow and unable to detect at room temperature

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  • Preparation method of gas sensor based on metal phthalocyanine and use method of gas sensor
  • Preparation method of gas sensor based on metal phthalocyanine and use method of gas sensor
  • Preparation method of gas sensor based on metal phthalocyanine and use method of gas sensor

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Embodiment 1

[0039] This embodiment provides a method for preparing a gas sensor based on metal phthalocyanine: dissolve metal phthalocyanine in a mixed solution of DMF and water, the mass ratio of DMF and water is 1:1, and drop it on the electrode to form a covering The metal phthalocyanine film on the electrode has an average film thickness of 200nm; the metal phthalocyanine film is composed of nanofibers, and the average length of the nanofibers is 200nm; the electrode is an interdigitated electrode.

[0040] The preparation of described metal phthalocyanine comprises the following steps:

[0041] Step 1: Trimellitic anhydride, urea, CoCl 2 And after ammonium molybdate is mixed and ground into powder according to the molar ratio of 400:2500:150:1, the ground powder is added into a container, heated to 200°C, and kept for 12 hours;

[0042] Step 2: Soak the product obtained in step 1 with 1mol / L hydrochloric acid for 14 hours, filter and wash to make the pH of the product reach 7;

[0...

Embodiment 2

[0049]According to Embodiment 1, this implementation provides a method for using a metallophthalocyanine-based gas sensor, comprising the following steps:

[0050] Step 1: Place the sensor in a closed cavity, fill it with dry air, and apply a voltage of 0.5V to the sensor;

[0051] Step 2: Introduce 50ppm of NO into the airtight cavity 2 Gas and maintain the concentration of gas atmosphere;

[0052] Step 3: Fill the airtight cavity with dry air, and irradiate the sensor with a laser with a wavelength of 395nm and a power of 50mW to make NO 2 For desorption, the laser irradiation incident angle is 0°, and the laser irradiation distance is 10 cm.

[0053] image 3 It is the NO that the sensor is placed in the concentration of 50ppm in this embodiment 2 The gas sensitivity response map measured in the gas, the recovery part is assisted by laser irradiation. Among them, Ig is the current value after the test gas is passed through, and Ia is the current value when the dry air ...

Embodiment 3

[0055] This embodiment provides a method for preparing a gas sensor based on metal phthalocyanine: dissolve metal phthalocyanine in a mixed solution of DMF and water, the mass ratio of DMF and water is 2:1, and drop it on the electrode to form a covering The metal phthalocyanine film on the electrode has an average film thickness of 100nm; the metal phthalocyanine film is composed of nanofibers, and the average length of the nanofibers is 100nm; the electrode is an interdigitated electrode.

[0056] The preparation of metal phthalocyanine comprises the following steps:

[0057] Step 1: Trimellitic anhydride, urea, NiCl 2 And after ammonium molybdate is mixed and ground into powder according to the molar ratio of 400:3000:180:4, the ground powder is added into the container, heated to 220°C, and kept for 18 hours;

[0058] Step 2: soak the product obtained in step 1 with 1.5mol / L hydrochloric acid for 18 hours, filter and wash to make the pH of the product reach 7.5;

[0059]...

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Abstract

The invention provides a preparation method of a gas sensor based on metal phthalocyanine and a use method of the gas sensor. The preparation method comprises the following steps: dissolving the metalphthalocyanine into a mixed solution of N,N-dimethylformamide and water and dropping the mixed solution on an electrode; drying to form a metal phthalocyanine thin film covering the electrode, wherein the electrode is an interdigital electrode. The invention also provides the use method of the gas sensor based on the metal phthalocyanine. The use method comprises the following steps: putting thesensor into a sealed cavity, filling the sealed cavity with detect gas with preset concentration and maintaining preset concentration gas atmosphere; filling the closed cavity with dry air or nitrogenduring recovering; in addition, enabling the detection gas to be desorbed by using a laser irradiation sensor. According to the method, the problems of slow response, low recovery speed and no possibility of carrying out normal temperature detection of the metal phthalocyanine gas sensor in the prior art can be effectively solved.

Description

technical field [0001] The invention belongs to the field of gas detection, and in particular relates to a preparation method and a use method of a gas sensor. Background technique [0002] At present, commercial gas sensors are mainly based on traditional metal oxide semiconductor sensors and solid electrolyte sensors, which detect gas concentrations in the order of one part per million (ppm) Work under the environment, high power consumption, low sensitivity, poor anti-interference ability and other problems. [0003] Metal phthalocyanine (Metal Phthalocyanine, MPc) has a unique macrocyclic conjugated structure and is an organic semiconductor material with excellent performance, so it can be used as a sensitive material to prepare organic gas sensors. Compared with traditional metal-oxide-semiconductor sensors and solid-state electrolyte sensors, MPc gas sensors have the advantages of abundant raw material sources, low cost, simple film-making process, and easy compatibil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
CPCG01N27/126G01N27/127
Inventor 杨志蒋文凯韩雨彤胡南滔苏言杰周志华
Owner SHANGHAI JIAO TONG UNIV
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