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Gas sensing module and its preparation method and application

A technology of gas sensing and gas sensing materials, which is applied in the field of new functional materials, can solve the problems of poor material stability and sensitivity, large noble metal particles, and low resistance, and achieve simple preparation methods, large specific surface area, and low energy consumption. low effect

Active Publication Date: 2022-02-15
CHINA PETROLEUM & CHEM CORP +2
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  • Abstract
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Problems solved by technology

[0003] The purpose of the present invention is to provide a gas sensing module and its preparation method and application in order to overcome the problems of low material output, large precious metal particles obtained by loading precious metals, and poor material stability and sensitivity in the prior art. , the gas sensing module has the characteristics of simple material preparation method, large output, simple loading method of precious metals, less dosage, good sensitivity and stability, and low resistance.

Method used

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  • Gas sensing module and its preparation method and application
  • Gas sensing module and its preparation method and application
  • Gas sensing module and its preparation method and application

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preparation example Construction

[0052] According to the preparation method of the gas sensing module of the present invention, the method comprises:

[0053] 1) Mixing a tin-containing compound, a C2-C6 organic dibasic acid, hydrazine hydrate and hydrochloric acid, performing a hydrothermal reaction, and then performing solid-liquid separation to obtain a tin dioxide carrier;

[0054] 2) Loading the noble metal on the tin dioxide carrier to obtain a noble metal-loaded gas-sensitive sensing material;

[0055] 3) loading the noble metal-loaded gas-sensitive sensing material on the microsensor chip;

[0056] Wherein, the noble metal is selected from one or more of the metal elements of Group IB and Group VIII.

[0057] Preferably, the noble metal is selected from one or more of Ag, Au, Pd and Pt.

[0058] In step 1), as long as the tin-containing compound can be dissolved in an acidic aqueous solution to obtain tin cations (Sn 4+ or Sn 2+ ), preferably tin-containing inorganic salts or oxides. The tin-cont...

preparation example 1

[0076] Microfabrication methods such as photolithography and evaporation are prepared on the surface of silicon wafers such as Figure 5 The shown interdigitated Au electrode (10 microns in width) was used as the sensing electrode 1, and the Au resistance wire for heating (5 microns in width) was used as the heating electrode 2, thereby obtaining a microsensor chip. And three microsensor chips are integrated and connected to a control circuit board.

Embodiment 1

[0078] (1) Mix 1g stannous dichloride dihydrate, 2g oxalic acid and 100mL deionized water, add 0.1mL concentrated hydrochloric acid (35%), 2.16g hydrazine hydrate (50wt%), and stir to form a transparent homogeneous mixed solution;

[0079] (2) Put the above mixed solution into the reaction kettle, conduct hydrothermal treatment at 160°C for 20 hours, and centrifuge after cooling;

[0080] (3) Collect the solid precipitate, add deionized water and ultrasonically disperse for 10 min, collect by centrifugation again, and repeat 3 times to obtain tin dioxide microspheres;

[0081] (4) Weigh 0.1 g of the above-mentioned tin dioxide microspheres, add it to 10 mL of AgNO with a concentration of 1 mmol / L 3 In the aqueous solution, the xenon lamp with a power of 300W was irradiated with ultraviolet light for 20 minutes to make AgNO 3 Decompose, then centrifuge at 10,000 rpm for 5 minutes, separate the filter residue, add deionized water to wash, centrifuge again to separate the filter...

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Abstract

The invention relates to the field of new functional materials, and discloses a gas sensing module and its preparation method and application. The gas sensing module includes a micro-sensor chip and a noble metal-loaded gas-sensitive sensing material loaded on the micro-sensor chip; wherein , the noble metal-loaded gas-sensitive sensing material includes a tin dioxide carrier and a noble metal supported on the tin dioxide carrier, and the noble metal is selected from one or more of the metal elements of Group IB and Group VIII. The gas sensing module provided by the invention has the characteristics of simple material preparation method, large output, simple way of loading precious metals, less dosage, good sensitivity and stability, low resistance and the like.

Description

technical field [0001] The invention relates to the field of new functional materials, in particular to a gas sensing module and its preparation method and application. Background technique [0002] Among the various gas-sensing sensing materials known at present, tin dioxide is the most commonly used, the best repeatable, and the most stable response, but it is also a material with poor specificity. Due to tin dioxide on such as H 2 , CO, H 2 S. NO x All kinds of gases have different degrees of response, so it is not suitable as a sensitive material for single gas detection. In recent years, with the development of technologies such as intelligent detection, multi-component gas sensors have gradually become an indispensable technical tool in the field of analysis and detection. Based on large-scale gas sensor arrays, the development and integration of intelligent detection devices with big data characteristics provides favorable strategic support for a new generation of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/26
CPCG01N27/26
Inventor 赵宇鑫胡适牟善军刘全桢王林张健中梁文杰霍子扬
Owner CHINA PETROLEUM & CHEM CORP
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