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Bismuth ferrite formaldehyde gas sensor in red light auxiliary mode and preparation method thereof

A technology of formaldehyde gas and auxiliary mode, which is applied in the field of formaldehyde sensors, can solve the problems of difficult formaldehyde accurate detection and device stability degradation, and achieve the effects of improving accuracy and sensitivity, improving selectivity, and being easy to carry

Inactive Publication Date: 2020-12-04
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, commercial semiconductor gas sensors are still difficult to achieve accurate detection of sub-ppm concentration of formaldehyde, and there are problems of selectivity and sensitivity.
[0004] In the existing technology, the use of light field assistance instead of traditional heating assistance can achieve precise gas detection. For example, under the ultraviolet light field, the performance of gas sensors such as sensitivity and response recovery time has been greatly improved, but the introduction of ultraviolet light cause a decrease in the stability of the device

Method used

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  • Bismuth ferrite formaldehyde gas sensor in red light auxiliary mode and preparation method thereof
  • Bismuth ferrite formaldehyde gas sensor in red light auxiliary mode and preparation method thereof
  • Bismuth ferrite formaldehyde gas sensor in red light auxiliary mode and preparation method thereof

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preparation example Construction

[0057] According to an embodiment of the present invention, a method for preparing a holmium ferrite formaldehyde gas sensor in the red light-assisted mode is also proposed, including the following steps:

[0058] Prepare the packaging shell and base, and reserve the position of the gas channel;

[0059] Mix 0.1g of holmium ferrite with 3mm of deionized water, grind thoroughly to form holmium ferrite paste;

[0060] Coating holmium ferrite paste onto the interdigitated electrodes to form a sensitive layer on the electrode base of the interdigitated electrodes;

[0061] Then naturally air-dry for 8 hours, and then age the prepared sensitive layer for 24 hours after the deionized water evaporates;

[0062] Fix the electrode base to the support inside the base, so that the sensitive layer is fixed to the support together;

[0063] Fix the LED light source with a predetermined wavelength of 660nm into the packaging shell and face the sensitive layer, then seal the packaging shel...

example 1

[0068] 1) Mix 0.1g of holmium ferrite with 3mL of deionized water, fully grind until there is no obvious graininess, and form holmium ferrite paste; coat the holmium ferrite paste material on the interdigitated electrode with silver / palladium, in the A sensitive layer is formed on the electrode substrate of the interdigitated electrode; then the sensitive layer formed on the electrode substrate of the interdigitated electrode is naturally air-dried for 8 hours, and after the deionized water evaporates, the prepared sensor is aged for 24 hours;

[0069] 2) Fix and install the electrode base of the interdigitated electrode on the bracket in the cavity of the base;

[0070] 3) Fixing the LED light source with a wavelength of 470nm in the encapsulation shell, and then sealing the encapsulation shell on the base, at this time, the sensitive layer on the base of the interdigitated device is in a blue light environment;

[0071] 4) Connect the pins of the sensitive layer on the subst...

example 2

[0073] 1) Mix 0.1g of holmium ferrite with 3mL of deionized water, fully grind until there is no obvious graininess, and form holmium ferrite paste; coat the holmium ferrite paste material on the interdigitated electrode with silver / palladium, in the A sensitive layer is formed on the electrode substrate of the interdigitated electrode; then the sensitive layer formed on the electrode substrate of the interdigitated electrode is naturally air-dried for 8 hours, and after the deionized water evaporates, the prepared sensor is aged for 24 hours;

[0074] 2) Fix and install the electrode base of the interdigitated electrode on the bracket in the cavity of the base;

[0075] 3) Fixing the 530nm wavelength LED light source in the packaging shell, and then sealing the packaging shell on the base, at this time, the sensitive layer on the base of the interdigitated device is in a green light environment;

[0076] 4) Connect the pins of the sensitive layer on the substrate of the inter...

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Abstract

The invention provides a bismuth ferrite formaldehyde gas sensor in a red light auxiliary mode and a preparation method of the bismuth ferrite formaldehyde gas sensor. The bismuth ferrite formaldehydegas sensor comprises a packaging shell, a base, an LED light-emitting source arranged in the packaging shell and a sensitive element arranged in the base. The packaging shell is arranged to package the base to form a sensor body, a gas channel allowing formaldehyde gas to pass through is formed in the edge of the base, and the gas channel comprises at least one inlet and at least one outlet; a bracket fixed on the base is also arranged in the base, the sensitive element comprises an interdigital electrode, an electrode substrate and a bismuth ferrite material coated on the interdigital electrode, the interdigital electrode and the bismuth ferrite material form a sensitive layer, and the electrode substrate is adhered and fixed on the bracket; and the LED light-emitting source is arrangedto be a 660-nm LED light-emitting source and used for emitting red light towards the sensitive layer, so that the sensitive layer is located in a red light environment for formaldehyde gas detection.

Description

technical field [0001] The invention relates to the technical field of formaldehyde sensors, in particular to a holmium ferrite formaldehyde gas sensor in a red light-assisted mode and a preparation method thereof. Background technique [0002] Formaldehyde is a highly dangerous volatile organic compound (VOC) gas, which can cause skin poisoning, leukemia and respiratory system cancer. As an important adhesive in daily decoration materials, urea-formaldehyde resin will slowly release formaldehyde gas over decades. According to my country's "Hygienic Standards for Formaldehyde in Indoor Air", the maximum allowable concentration of formaldehyde in indoor air is 0.08mg / m 3 (~80ppb). Therefore, the monitoring of indoor formaldehyde concentration is a very important and urgent task. [0003] At present, although there are many technical means that can detect formaldehyde gas at sub-ppm levels, such as spectrophotometry, electrochemical detection, gas chromatography, liquid chr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
CPCG01N27/12
Inventor 张勇孟繁朴曹觉先宋逸俏胡金勇张志勇
Owner XIANGTAN UNIV