Cerium-doped zinc oxide nanofiber qcm humidity sensor and preparation method thereof

A zinc oxide nanometer, humidity sensor technology, applied in instruments, scientific instruments, material weighing, etc., can solve the problems of long response time of humidity sensors, affecting the practical application of sensors, etc., to shorten sampling time, strong practicability, preparation simple method effect

Inactive Publication Date: 2019-05-31
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the humidity sensor prepared by the QCM method has a long response time to humidity, which affects the practical application of the sensor.

Method used

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  • Cerium-doped zinc oxide nanofiber qcm humidity sensor and preparation method thereof
  • Cerium-doped zinc oxide nanofiber qcm humidity sensor and preparation method thereof
  • Cerium-doped zinc oxide nanofiber qcm humidity sensor and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0031] A preparation method of zinc oxide nanofiber QCM humidity sensor, comprising the following steps:

[0032] (1) Preparation of zinc oxide nanofiber sensitive layer: 1.2 grams of zinc acetate, 0.08 grams of cerium nitrate, 0.45 grams of deionized water and 2.0 grams of absolute ethanol were mixed and then magnetically stirred, 1.2 grams of polyvinylpyrrolidone with a molecular weight of 1.3 million and 8.5 grams After mixing absolute ethanol, heat and stir in a water bath at 60°C for 2 hours. After the solution is evenly stirred, slowly pour the cooled PVP solution into the zinc acetate solution, and stir magnetically for 1 hour to prepare a precursor spinning solution doped with cerium zinc oxide. The prepared cerium-doped zinc oxide nanofibers were prepared by spinning, the spinning temperature was 20°C, the humidity was 60%, the spinning distance was 13.5 cm, and the spinning voltage was 25 kV; the prepared cerium-doped zinc oxide nanofibers were placed in a muffle Dur...

Embodiment 2

[0036] A preparation method of a zinc oxide nanofiber quartz crystal microbalance humidity sensor, comprising the following steps:

[0037] (1) Preparation of the zinc oxide nanofiber sensitive layer: first dissolve 1 gram of polyethylene oxide PEO (relative molecular mass 5,000,000) in deionized water, place it in the Erlenmeyer flask A, and stir it with a magnetic stirrer for 4 hours at room temperature. To obtain solution A, add 1.2 grams of zinc acetate and 0.08 grams of cerium nitrate into a conical flask B equipped with 2 grams of absolute ethanol and 0.45 grams of deionized water, and stir for 2 hours under a magnetic stirrer to obtain inorganic salt solution B, mix The prepared polymer solution A and inorganic salt solution B are fully stirred with a magnetic stirrer for 2 hours to obtain a precursor spinning solution of zinc oxide; the positive pole of the high voltage power supply of the electrospinning device is connected to the needle tip of the syringe, and the neg...

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Abstract

The invention discloses a QCM (quartz crystal microbalance) humidity sensor adopting cerium doped zinc oxide nano-fiber and a preparation method of the QCM humidity sensor. The humidity sensor adopts an electrospun cerium doped zinc oxide nano-fiber membrane as a humidity sensitive material of the QCM quality type sensor, the primary morphology of the nano-fiber membrane is reserved, the nano-fiber membrane is directly attached to an electrode, the technology reserves the feature that a special arrangement mode of cerium doped zinc oxide nanowires in the nano-fiber can directly influence the sensing property of the fiber, and accordingly, the humidity sensor has better and more stable humidity sensitive performance, and the defect of long humidity response time of a conventional QCM quality type sensor is overcome; the QCM humidity sensor has the remarkable advantages of simple preparation method, high sensitivity, fast response, good repeatability and simplicity in operation.

Description

technical field [0001] The invention belongs to the field of moisture-sensitive materials and humidity sensors, and in particular relates to a QCM humidity sensor doped with cerium-doped zinc oxide nanofibers and a preparation method thereof. Background technique [0002] The humidity sensor refers to a sensor that detects the humidity of the external environment. The sensing and control of humidity has a huge market demand in human life and various industrial and agricultural production fields, such as food packaging, room temperature agriculture, weather forecasting, electronic device manufacturing, etc. Nanomaterials have the advantages of small size and large specific surface area, and people gradually apply them in gas sensors to improve their gas-sensing properties. At present, polymers and metal oxides are widely used as sensing materials. Although gas sensors with polymers as sensitive materials have certain advantages, their response time and recovery time are usu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N5/00
Inventor 张红娣龙云泽公茂刚李照建刘燕杰闫旭于桂凤
Owner QINGDAO UNIV
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