QCM (quartz crystal microbalance) formaldehyde sensor with chemical and physical adsorption effects and preparation method thereof

A technology of formaldehyde sensor and adsorption effect, which is applied in the direction of using material absorption and weighing, can solve the problems of reporting or recording, and achieve the effects of low cost, enhanced system structure, and increased specific surface area

Active Publication Date: 2014-12-10
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
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Problems solved by technology

[0007] The above two groups have conducted related research on QCM formaldehyde sensors from the aspects of polyethyleneimine (PEI) materials, functionalized SBA-15 and diphenylsulfone-based chain complexes, and have made corresponding achievements and applied for related applications, However, neither of these two groups has conducted relevant research and applied for patents on the deposition of composite film formaldehyde sensors with different adsorption effects on both sides of the QCM sensor electrode, and there is no relevant report or record in the prior art.

Method used

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  • QCM (quartz crystal microbalance) formaldehyde sensor with chemical and physical adsorption effects and preparation method thereof
  • QCM (quartz crystal microbalance) formaldehyde sensor with chemical and physical adsorption effects and preparation method thereof
  • QCM (quartz crystal microbalance) formaldehyde sensor with chemical and physical adsorption effects and preparation method thereof

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Embodiment 1

[0041] A QCM formaldehyde sensor with chemical physical adsorption effect, comprising a quartz crystal microbalance (QCM) substrate 1, the quartz crystal microbalance (QCM) used in the quartz crystal microbalance (QCM) substrate 1 is AT tangential type quartz crystal plate, the fundamental frequency of the quartz crystal microbalance (QCM) substrate 1 is 3MHz to 15MHz. The upper surface of the quartz crystal microbalance (QCM) substrate 1 is provided with an upper metal electrode 2, and the lower surface of the quartz crystal microbalance (QCM) substrate 1 is provided with a lower metal electrode 3. The electrode 2 and the lower metal electrode 3 are both gold or silver electrodes. In this embodiment, the upper metal electrode 2 is a gold electrode, and the lower metal electrode 3 is a silver electrode. Of course, the upper metal electrode 2 can also be a silver electrode. Electrode, the lower metal electrode 3 is a gold electrode. On one surface of the upper metal electrode ...

Embodiment 2

[0043] A QCM formaldehyde sensor with chemical physical adsorption effect, comprising a quartz crystal microbalance (QCM) substrate 1, the quartz crystal microbalance (QCM) used in the quartz crystal microbalance (QCM) substrate 1 is AT tangential type quartz crystal plate, the fundamental frequency of the quartz crystal microbalance (QCM) substrate 1 is 3MHz to 15MHz. The upper surface of the quartz crystal microbalance (QCM) substrate 1 is provided with an upper metal electrode 2, and the lower surface of the quartz crystal microbalance (QCM) substrate 1 is provided with a lower metal electrode 3. The electrode 2 and the lower metal electrode 3 are both gold or silver electrodes. In this embodiment, the upper metal electrode 2 and the lower metal electrode 3 are all gold electrodes. Of course, the upper metal electrode 2 and the lower metal electrode can also be gold electrodes. 3 are silver electrodes. On one surface of the upper metal electrode 2 and the lower metal elect...

Embodiment 3

[0045] On the basis of Embodiment 1 or Embodiment 2, the formaldehyde sensitive film 4 is mainly made of a solution prepared from an organic polymer sensitive material and a graphene dispersion. The formaldehyde sensitive film 4 is a composite sensitive film prepared by a solution prepared from an organic polymer sensitive material and a graphene dispersion by air spraying, spot coating or inkjet printing. The method in this embodiment adopts the method of air spraying Composite sensitive membranes were prepared. The organic polymer sensitive material includes two materials: a polymer sensitive material having a physical adsorption effect on formaldehyde gas and a polymer sensitive material having a chemical adsorption effect on formaldehyde gas, and the polymer sensitive material having a physical adsorption effect on formaldehyde gas The materials are polypyrrolidone (PVP), poly 3-hexylthiophene (P3HT), polyvinylidene fluoride (PVDF), polyepichlorohydrin (PECH), polyethylene...

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Abstract

The invention discloses a QCM (quartz crystal microbalance) formaldehyde sensor with chemical and physical adsorption effects and a preparation method thereof, belonging to QCM formaldehyde sensors in the technical field of gas sensors. A sensor substrate is a QCM, and formaldehyde sensitive films 4 with chemical and physical adsorption effects are deposited on two sides of a QCM electrode, respectively, wherein the sensitive films are composite sensitive films prepared from organic polymer sensitive materials and carbon nano tubes or graphene and other materials through processes such as gas blowout, dispensing or ink-jet printing. According to the sensor, the high specific surface area and supporting characteristics of materials such as the nano tubes or graphene as well as adsorption or specific response performance of polymer materials are fully utilized, chemical / physical enhancement effects of double-sided composite sensitive films are exerted, and the sensitivity and adsorption / desorption rate of the sensor are improved. The sensor has the advantages of simple preparation process, low cost, high sensitivity, capability of operating at room temperature and the like and the technical scheme disclosed by the invention can be widely applied to QCM formaldehyde sensors.

Description

technical field [0001] The invention relates to a QCM formaldehyde sensor with both chemical adsorption effect and physical adsorption effect, belonging to the technical field of gas sensors. Background technique [0002] With the continuous improvement of people's living standards, interior decoration is also gradually rising. Materials such as plywood, paint, and coatings in interior decoration will release formaldehyde gas. As a protoplasmic poison, formaldehyde has the characteristics of long-term, latent and concealed harm to human health. Formaldehyde gas is one of the volatile organic gases (VOCs). The U.S. Environmental Protection Agency and the World Health Organization (WHO) have identified formaldehyde gas as a harmful substance and listed it as an indoor air quality monitoring tool. Important indicators. Indoor air pollutants mainly include formaldehyde (HCHO), benzene series, total volatile organic compounds, etc. The first prerequisite for improving indoo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/02
Inventor 太惠玲何应飞徐晓颖蒋亚东杜晓松谢光忠
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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