QCM (Quartz Crystal Microbalance) gas sensor modified by polyaniline nanowires as well as preparation method and application of QCM gas sensor

A gas sensor, nanowire technology, applied in nanotechnology, nanotechnology, nanotechnology for sensing, etc., can solve the problems of difficult to control the thickness of the film, weak bonding between the film and the surface of the electrode, and poor consistency of the prepared components. Achieve the effect of low cost, improved gas sensing performance and fast response time

Inactive Publication Date: 2018-06-29
ZHEJIANG UNIV
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Problems solved by technology

Quartz crystal microbalance sensor for detecting HCN gas and its preparation method and application (CN101988882A), discloses a nanorod-shaped copper oxide modified quartz crystal microbalance gas sensor, using a drop coating method to modify the sensitive material on the surface of the quartz crystal electrode, It has good sensitivity and selectivity to hydrogen cyanide gas, but there are problems such as difficult control of film thickness, weak bonding between film and electrode surface, poor consistency of prepared components, etc.

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  • QCM (Quartz Crystal Microbalance) gas sensor modified by polyaniline nanowires as well as preparation method and application of QCM gas sensor
  • QCM (Quartz Crystal Microbalance) gas sensor modified by polyaniline nanowires as well as preparation method and application of QCM gas sensor
  • QCM (Quartz Crystal Microbalance) gas sensor modified by polyaniline nanowires as well as preparation method and application of QCM gas sensor

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preparation example Construction

[0033] A preparation method of the gas sensor:

[0034] Proceed as follows:

[0035] 1) Dissolve 2-10 mL of aniline monomer in 60-90 ml of water and stir to form a uniform aniline solution. The water is ultra-pure water with a resistivity of 18.2 MΩ·cm;

[0036] 2) Take 1-5 mL of perchloric acid, dissolve it in 15-30 mL of water, stir to form a uniform perchloric acid solution, and the water is ultrapure water with a resistivity of 18.2 MΩ·cm;

[0037] 3) Mix equal volumes of the solutions obtained in steps 1) and 2), and stir evenly to obtain a 30-50 mL mixed solution;

[0038] 4) Add 0.005 ~ 0.05g hydroxyethyl cellulose to the mixed solution obtained in step 3);

[0039] 5) Immerse the quartz wafer in a mixed solution of 98% concentrated sulfuric acid and 30% hydrogen peroxide with a volume ratio of 1:3, take it out after two minutes, rinse it, and dry it in nitrogen to obtain the treated quartz crystal micro balance;

[0040] 6) Connect one pin of the quartz crystal mic...

Embodiment 1

[0049] Dissolve 2 mL of aniline in 60 mL of water and stir to form an aqueous solution of aniline. Dissolve 1 mL of perchloric acid in 15 mL of water to obtain an aqueous solution of perchloric acid. The above solutions were mixed in equal volumes and stirred to obtain 15 mL of mixed solution. Take 0.005g of hydroxyethyl cellulose and add it into the above mixed solution, stir to dissolve it. Remove the metal shell of the quartz crystal microbalance, immerse the quartz wafer in a mixed solution of concentrated sulfuric acid with a mass fraction of 98% and hydrogen peroxide with a mass fraction of 30% at a volume ratio of 1:3, take it out after two minutes, rinse it with water, and Blow dry under nitrogen. Connect one pin of the QCM to the electrochemical workstation as the working electrode, and the other pin is suspended in the air. The silver / silver chloride electrode is used as the reference electrode, and the platinum electrode is used as the auxiliary electrode to form ...

Embodiment 2

[0051] Dissolve 6 mL of aniline in 80 mL of water and stir to form an aqueous solution of aniline. Dissolve 3 mL of perchloric acid in 20 mL of water to obtain an aqueous solution of perchloric acid. The above solutions were mixed in equal volumes and stirred to obtain 20 mL of mixed solution. Take 0.02g of hydroxyethyl cellulose and add it to the above mixed solution, stir to dissolve it. Remove the metal shell of the quartz crystal microbalance, immerse the quartz wafer in a mixed solution of concentrated sulfuric acid with a mass fraction of 98% and hydrogen peroxide with a mass fraction of 30% at a volume ratio of 1:3, take it out after two minutes, rinse it with water, and Blow dry under nitrogen. Connect one pin of the QCM to the electrochemical workstation as the working electrode, and the other pin is suspended in the air. The silver / silver chloride electrode is used as the reference electrode, and the platinum electrode is used as the auxiliary electrode to form a t...

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Abstract

The invention discloses a QCM (Quartz Crystal Microbalance) gas sensor modified by polyaniline nanowires as well as a preparation method and application of the gas sensor. The gas sensor is characterized in that a polyaniline thin film with a nanowire-shaped structure is modified on an electrode surface of a QCM and is 80-120nm in diameter and 500-1000nm in length. A gas-sensitive film is generated by an electrochemical polymerization method. The gas sensor has good sensitivity, resilience and repeatability under room temperature, the selectivity is good, and the preparation method is simple and easy to operate, so that the QCM gas sensor can be widely applied in trace-level detection of gas under the room temperature.

Description

technical field [0001] The invention belongs to the technical field of gas sensors, and relates to a quartz crystal microbalance gas sensor modified by polyaniline nanowires capable of detecting gas at room temperature, a preparation method and an application thereof. Background technique [0002] With the increasing demand for gas detection, gas sensors have been more and more widely used in industrial, medical, safety, food detection and other fields. At present, the sensitive materials used in gas sensors mainly include inorganic metal oxide semiconductor materials and organic conductive polymer materials. Among them, metal oxide semiconductor materials are the most commonly used. lower and less selective. Organic conductive polymer materials such as polyaniline, polypyrrole, polythiophene, etc. can be used at room temperature, have good conductivity, and are simple in preparation and reliable in performance, and have many applications in the field of gas sensors. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/00B82Y30/00B82Y40/00B82Y15/00
CPCB82Y15/00B82Y30/00B82Y40/00G01N5/00
Inventor 王俊邓凡霏
Owner ZHEJIANG UNIV
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