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Piezoelectric type hydrogen sensor and its preparation and uses

A sensor and piezoelectric technology, applied in the field of hydrogen sensors, can solve the problems of transportation and storage leakage, non-quantitative detection, small hydrogen molecular weight, etc., and achieve the effects of simple operation, low manufacturing cost and simple preparation process

Inactive Publication Date: 2008-10-22
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the content of hydrogen in the air is about 4%-75%, it will explode when it encounters an open flame. In addition, the molecular weight of hydrogen is small and colorless and odorless. It is easy to leak and difficult to detect during reprocessing, transportation and storage, thus causing a big security risk
In the existing technology, the detection of hydrogen leakage generally uses sensitive components, mostly non-quantitative detection, and only simple alarm information is given. Therefore, it is particularly important to quantitatively detect the content of hydrogen in the air.

Method used

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  • Piezoelectric type hydrogen sensor and its preparation and uses
  • Piezoelectric type hydrogen sensor and its preparation and uses
  • Piezoelectric type hydrogen sensor and its preparation and uses

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Take 50mg of multi-walled carbon nanotubes (MWNTs), in 3M HNO 3 Reflux for 3 hours, then wash, filter, and dry at 60°C for later use.

[0026] 2) Take 5mg of MWNTs, in turn in 0.1M SnCl 2 +0.1M HCl, 1mM PdCl 2 Immerse in +0.1M HCl for 10min, 4 consecutive times, filter, wash and dry.

[0027] Disperse it in 1 mM PdCl with 2 mL of ammonia added dropwise 2 +0.1M HCl+60g / L EDTA100ml solution, add 50μL N 2 h 4 , heated to 50°C, after 50min, filtered, washed and dried. Pd nanoparticles can be well combined with carbon nanotubes, such as Figure 1 Show.

[0028] 3) Put the quartz crystal sheet Cr / Pt (9M Hz) in concentrated H 2 SO 4 : 30%H 2 o 2 Soak in the solution of (1:3) for 20 minutes, take out and soak in absolute ethanol for 20 minutes, and then dry under infrared lamp.

[0029] 4) Disperse 2mg of Pd-MWNTs composite material into 2mL of DMF solution, and sonicate for 30 minutes.

[0030] 5) Take 10 μL of the above dispersion liquid and drop it on the ele...

Embodiment 2

[0032] 1) Remove 100mg of SiO 2 (100 mesh), followed by 0.1M SnCl 2 +0.1M HCl, 1mM PdCl 2 Immerse in +0.1M HCl for 10min, 4 consecutive times, filter, wash and dry.

[0033] Disperse it in 1 mM PdCl with 2 mL of ammonia added dropwise 2 +0.1M HCl+60g / L EDTA100ml solution, add 50μL N 2 h 4 , heated to 50°C, after 50min, filtered, washed and dried to obtain Pd-SiO 2 nanocomposites.

[0034] 2) Quartz crystal plate Cr / Pt (9M Hz) in concentrated H 2 SO 4 : 30%H 2 o 2 Soak in the solution of (1:3) for 20 minutes, take out and soak in absolute ethanol for 20 minutes, and then dry under infrared lamp.

[0035] 3) Take 2mg of Pd-SiO 2 The composite material was dispersed into 2mL DMF solution and sonicated for 30 minutes.

[0036] 4) Take 10 μL of the above-mentioned dispersion liquid, drop it on the electrode surface of the quartz crystal plate, test it on the quartz crystal microbalance after the solvent evaporates, and record the relationship between the frequency chang...

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Abstract

The invention relates to a hydrogen sensor, in particular to a piezoelectric hydrogen sensor and preparation and application of the same. The piezoelectric hydrogen sensor comprises a quartz crystal microbalance and hydrogen sensitive materials, wherein, the hydrogen sensitive materials are nanophase materials which are loaded with Pd nano microparticles and are then fixed on a wafer of the quartz crystal microbalance. The hydrogen sensor can quantitatively detect the concentration of hydrogen at room temperature, and have simple and convenient operation and good repeatability. The piezoelectric hydrogen sensor prepared adopts a carbon nano tube to load Pd, overcomes the defect of loose bonding force of the Pd and matrixes, improves the sensitivity of hydrogen detection and also has the advantages of simple technique, wide application range, low manufacturing cost and so on.

Description

technical field [0001] The invention relates to a hydrogen sensor, in particular to a piezoelectric hydrogen sensor and its preparation and application. Background technique [0002] Hydrogen is a reducing gas commonly used in modern chemical production, and it is also an important raw material for future clean energy. When the content of hydrogen in the air is about 4%-75%, it will explode when it encounters an open flame. In addition, the molecular weight of hydrogen is small and colorless and odorless. It is easy to leak and difficult to detect during reprocessing, transportation and storage, thus causing A great security risk. In the existing technology, the detection of hydrogen leakage generally uses sensitive components, mostly non-quantitative detection, and only simple alarm information is given. Therefore, it is particularly important to quantitatively detect the content of hydrogen in the air. Contents of the invention [0003] The object of the present invent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00G01N19/00
Inventor 孙立贤邹勇进向翠丽徐芬
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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