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Formaldehyde gas sensor

A formaldehyde gas and sensor technology, used in instruments, scientific instruments, measuring devices, etc., can solve the problems of long reaction time, reduced sensitivity and low detection efficiency of the sensing layer, reduce the detection limit and reaction time, and improve the detection sensitivity. Effect

Inactive Publication Date: 2009-01-21
张薰予 +2
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Problems solved by technology

[0004] Generally speaking, the above-mentioned existing formaldehyde gas sensor has the following disadvantages, for example: the interdigitated electrode group is arranged on the upper surface of the sensing layer, so that the interdigitated electrode group reduces the gas sensing layer and the organic volatilization. The contact area of ​​the gas reduces the sensitivity and the minimum detection limit is high; in addition, due to the long reaction time of the sensing layer, the measurement time of the existing gas sensor is long, which leads to the low detection efficiency

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Embodiment Construction

[0022] In order to make the above and other objects, features and advantages of the present invention more obvious and understandable, the preferred embodiments of the present invention, together with the accompanying drawings, are described in detail as follows:

[0023] Please refer to figure 1 As shown, the formaldehyde gas sensor disclosed in the preferred embodiment of the present invention includes a substrate 1 , an electrode layer 2 and a gas sensing layer 3 . One side of the substrate 1 is provided with the electrode layer 2 , and the gas sensing layer 3 is disposed on one side of the electrode layer 2 such that the electrode layer 2 is interposed between the substrate 1 and the gas sensing layer 3 . The substrate 1 is used to support the electrode layer 2 and the gas sensing layer 3 . The electrode layer 2 is used to measure the resistance value of the gas sensing layer 3 . The gas sensing layer 3 is a catalyst for a specific gas to be sensed to catalyze the oxidat...

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Abstract

The invention relates to a formaldehyde gas sensor, which comprises a substrate, an electrode layer and a gas sensing layer, wherein the substrate is made of insulating materials, the electrode layer is arranged on one side of the substrate, the gas sensing layer is at least made of nickel oxide (NiO) and is arranged on one side of the electrode layer, and the electrode layer is led to be arranged between the substrate and the gas sensing layer, and the thickness of the gas sensing layer is between 0.3 and 0.52mum. The formaldehyde gas sensor can effectively improve detection sensitivity and detection efficiency, which lowers the minimum detection limit and the reaction time.

Description

technical field [0001] The invention relates to a gas sensor, in particular to a formaldehyde gas sensor. Background technique [0002] Because formaldehyde (formaldehyde, HCHO) has the advantages of high chemical activity, high purity and relatively cheap, it is widely used and applied in industrial production of building materials and chemical raw materials of most household products. Formaldehyde in building and furniture coatings will gradually release free formaldehyde into the environment during long-term use. However, if the human body is exposed to excessive formaldehyde, it may cause respiratory or skin inflammation, eye irritation, and may even cause cancer. Therefore, it is necessary to develop a formaldehyde gas sensor to detect the concentration of formaldehyde in the environment. [0003] The existing formaldehyde gas sensor, as described in the invention patent No. I239400 of Taiwan Patent No. I239400 "Miniature sensor for organic volatile gas and its manufac...

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Application Information

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IPC IPC(8): G01N27/407
Inventor 李佳言江哲铭傅龙铭林哲信周伯丞王禹翔
Owner 张薰予
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