Gas sensor for detecting trace benzene

A gas sensor and gas sensitive film technology, which is applied in nanotechnology, nanotechnology, nanotechnology and other directions for sensing, can solve the problems of long detection period, inability to achieve accurate and rapid detection of trace benzene on-site, and high cost. The effect of short response time, simple structure and low cost

Inactive Publication Date: 2013-12-04
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these tests can accurately detect the concentration of trace benzene in the environment, these methods generally have shortcomings such as long detection period and high cost, and require professionally trained skilled technicians to operate instruments and equipment, and cannot realize the on-site detection of trace benzene in the environment. Accurate and fast detection

Method used

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  • Gas sensor for detecting trace benzene
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  • Gas sensor for detecting trace benzene

Examples

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Effect test

Embodiment 1

[0029] A gas sensor for detecting trace amounts of benzene, such as figure 1 As shown, it includes a gas-sensitive film, a first electrode, and a second electrode that are distributed sequentially from top to bottom. The second electrode is prepared by anodizing an aluminum plate. The gas sensitive film is prepared by sputtering process, and the gas sensitive film is formed by coating the treated carbon nanotubes on the surface of the first electrode, and the thickness of the gas sensitive film is 5 μm.

[0030] The second electrode is prepared by the following steps:

[0031] Take a high-purity aluminum plate with a thickness of 3 mm, firstly clean it ultrasonically for 15 minutes in a mixed solution of acetone and ethanol with a volume ratio of 2:1, and then polish it in a mixed solution of ethanol and perchloric acid with a volume ratio of 3:1 (Ra ≤0.01μm) for 15 minutes; then, wash it with deionized water and place it in a 0.25mol / L oxalic acid solution, anodize it at a D...

Embodiment 2

[0041] A gas sensor for detecting trace amounts of benzene, such as figure 1 As shown, it includes a gas-sensitive film, a first electrode, and a second electrode that are distributed sequentially from top to bottom. The second electrode is prepared by anodizing an aluminum plate. Prepared by sputtering process, the gas sensitive film is formed by coating the treated carbon nanotubes on the surface of the first electrode, and the thickness of the gas sensitive film is 8 μm.

[0042] The second electrode is prepared by the following steps:

[0043] Take a high-purity aluminum plate with a thickness of 5 mm, firstly clean it ultrasonically for 20 minutes in a mixed solution of acetone and ethanol with a volume ratio of 1:1, and then polish it in a mixed solution of ethanol and perchloric acid with a volume ratio of 4:1 (Ra ≤0.01μm) for 5 minutes; then, wash it with deionized water and place it in a 0.3mol / L oxalic acid solution, anodize at a DC voltage of 40V for 0.5h, and coat...

Embodiment 3

[0051] A gas sensor for detecting trace amounts of benzene, such as figure 1 As shown, it includes a gas-sensitive film, a first electrode, and a second electrode that are distributed sequentially from top to bottom. The second electrode is prepared by anodizing an aluminum plate. The gas sensitive film is prepared by sputtering process, and the gas sensitive film is formed by coating the treated carbon nanotubes on the surface of the first electrode, and the thickness of the gas sensitive film is 10 μm.

[0052] The second electrode is prepared by the following steps:

[0053] Take a high-purity aluminum plate with a thickness of 1 mm, firstly clean it ultrasonically for 30 minutes in a mixed solution of acetone and ethanol with a volume ratio of 1.5:1, and then polish it in a mixed solution of ethanol and perchloric acid with a volume ratio of 2:1 (Ra ≤0.01μm) for 10min; then, wash it with deionized water and place it in a 0.35mol / L oxalic acid solution, anodize at a DC vol...

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Abstract

The invention relates to the field of gas sensors, in particular to a gas sensor for detecting trace benzene. The gas sensor for detecting the trace benzene comprises a gas sensitive membrane, a first electrode and a second electrode, wherein the gas sensitive membrane, the first electrode and the second electrode are sequentially distributed from top to bottom. The second electrode is prepared through an aluminum plate by means of anodic oxidation. The first electrode is prepared through the practice that a direct-current magnetron sputtering process is carried out on precious metal on the surface of the second electrode. The gas sensitive membrane is formed after the surface of the first electrode is coated by a processed carbon nano tube. The gas sensor is short in detection cycle, low in production cost, simple in operation and capable of quickly and accurately detecting the trace benzene.

Description

technical field [0001] The invention relates to the field of gas sensors, in particular to a gas sensor for detecting trace amounts of benzene. Background technique [0002] Benzene is a colorless, sweet-smelling transparent liquid at room temperature with a strong aromatic odor. Benzene is flammable, toxic, and a carcinogen. Benzene is a hydrocarbon and the simplest aromatic hydrocarbon. It is hardly soluble in water, easily soluble in organic solvents, and can also be used as an organic solvent itself. Benzene can paralyze the central nervous system and cause acute poisoning. In severe cases, headache, nausea, vomiting, confusion, loss of consciousness, coma, convulsions, etc. will occur, and severe cases will die due to central paralysis. A small amount of benzene can also cause drowsiness, dizziness, rapid heart rate, headache, tremor, confusion, unconsciousness and other phenomena. Ingestion of foods containing too much benzene can cause symptoms such as vomiting, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/02B82Y15/00
Inventor 惠国华邵拓李晨迪王南露周瑶詹玉丽周于人杜桂苏马美娟顾佳璐李曼蔡艳芳许晓岚黄洁王敏敏
Owner ZHEJIANG GONGSHANG UNIVERSITY
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