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Sensitive material for benzene vapor detecting sensor and preparation method of gas sensor

A technology for detecting sensors and gas-sensitive elements, which is applied in the direction of analyzing materials, material analysis by electromagnetic means, instruments, etc., can solve the problems of high material cost, complex equipment, and high maintenance cost, and achieves improved sensitivity and selectivity. Effect of temperature and power consumption, simple preparation process

Active Publication Date: 2014-04-02
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The reported benzene vapor detection sensors include quartz microcrystal balance detection method, photoelectric sensor, electrochemical sensor, LB film sensor, gas chromatography sensor, infrared detector and carbon nanotube sensor, etc., but there are some unavoidable shortcomings. For example, the equipment is huge and inconvenient to carry; the equipment is complicated and the maintenance cost is high; the synthesis of organic sensitive materials is complicated and the yield is not high; the detection limit cannot meet the indoor environmental testing standards;

Method used

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  • Sensitive material for benzene vapor detecting sensor and preparation method of gas sensor
  • Sensitive material for benzene vapor detecting sensor and preparation method of gas sensor
  • Sensitive material for benzene vapor detecting sensor and preparation method of gas sensor

Examples

Experimental program
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Effect test

Embodiment 1

[0021] The preparation method of benzene vapor detection sensor sensitive material and gas sensor in this example comprises the following steps:

[0022] a.SnO 2 Preparation of nanomaterials: with SnCl 4 ·5H 2 O as a raw material, dissolved in deionized water to make a 0.05mol / L solution, stirred magnetically in a constant temperature water bath at 40°C for 30 minutes, added ammonia water dropwise to adjust the pH to 2-5; centrifuged to obtain a white colloidal precipitate, and then used to Ionized water and absolute ethanol were centrifuged and washed several times, dried to obtain gel particles, annealed at 500 ° C for 2 hours, and finely ground with an agate mortar to obtain SnO 2 nanomaterials;

[0023] b.SnO 2 / V 2 o 5 Preparation of nanocomposites: the SnO 2 :V 2 o 5 According to the mass ratio of 99:1, the two nanomaterials are mixed and ground evenly, and the solid-state reaction is carried out at 600 ° C for 2 hours to obtain SnO 2 / V 2 o 5 Nanocomposite ...

Embodiment 2

[0026] The preparation method of benzene vapor detection sensor sensitive material and gas sensor in this example comprises the following steps:

[0027] a.SnO 2 Preparation of nanomaterials: with SnCl 4 ·5H 2 O as the raw material, dissolved in deionized water to make a 0.1 mol / L solution, stirred magnetically in a constant temperature water bath at 40°C for 40 minutes, added ammonia water dropwise to adjust the pH to 2-5; centrifuged to obtain a white colloidal precipitate, and then used Ionized water and absolute ethanol were centrifuged and washed several times, dried to obtain gel particles, annealed at 500 ° C for 2 hours, and finely ground with an agate mortar to obtain SnO 2 nanomaterials;

[0028] b.SnO 2 / V 2 o 5 Preparation of nanocomposites: the SnO 2 :V 2 o 5 According to the mass ratio of 9:1, the two nanomaterials are mixed and ground evenly, and the solid-state reaction is carried out at 600 ° C for 3 hours to obtain SnO 2 / V 2 o 5 Nanocomposite ma...

Embodiment 3

[0031] The preparation method of benzene vapor detection sensor sensitive material and gas sensor in this example comprises the following steps:

[0032] a.SnO 2 Preparation of nanomaterials: with SnCl 4 ·5H 2 O as the raw material was dissolved in deionized water to make a 0.2 mol / L solution, magnetically stirred in a constant temperature water bath at 40°C for 50 minutes, and ammonia water was added dropwise to adjust the pH to 2-5; a white colloidal precipitate was obtained after centrifugation, and then used to Ionized water and absolute ethanol were centrifuged and washed several times, dried to obtain gel particles, annealed at 500 ° C for 2 hours, and finely ground with an agate mortar to obtain SnO 2 nanomaterials;

[0033] b.SnO 2 / V 2 o 5 Preparation of nanocomposites: the SnO 2 :V 2 o 5 According to the mass ratio of 4:1, the two nanomaterials are mixed and ground evenly, and the solid-state reaction is carried out at 600 ° C for 3 hours to obtain SnO 2 / ...

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Abstract

The invention relates to a sensitive material for a benzene vapor detecting sensor and a preparation method of a gas sensor and belongs to the technical field of function materials, sensing technology and environmental monitoring technology. The preparation method includes: using SnO2 prepared by a sol-gel method and commercial V2O5 to prepare a composite material by means of solid-phase reaction, and using the composite material as the sensitive material to detect benzene vapor; subjecting the gas sensor coated with the SnO2 / V2O5 nano-composite material to calcination at 500 DEG C, and welding the gas sensor according to a thick-film semiconductor gas sensor manufacture process, namely, welding a quadrangular electrode lead platinum filament; and ageing and packaging after drying so that the gas sensor for detecting benzene vapor is prepared. The prepared gas sensor for detecting the benzene vapor has the advantages of high sensitivity, high selectivity, low power consumption and the like, and can be used for detecting benzene vapor and methylbenzene vapor in the atmosphere or indoor environment.

Description

technical field [0001] The invention relates to a preparation method of a sensitive material for a benzene vapor detection sensor and a gas sensor, and belongs to the technical fields of functional materials, sensing technology and environmental monitoring. Background technique [0002] Benzene is a colorless, sweet-smelling transparent liquid at room temperature with a strong aromatic odor and a boiling point of 80.1°C. It is hardly soluble in water but easily soluble in organic solvents. It is also widely used as an organic solvent in various building materials and glues, paints, and leather products used in interior decoration. As we all know, benzene is very harmful to the human body. It was identified as a strong carcinogen by the World Health Organization many years ago. Therefore, it is not only necessary but also necessary to monitor the concentration of benzene vapor in the environment. Many countries have taken the detection of benzene vapor as an important indica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/00B82Y40/00
Inventor 徐甲强张飞虎赵宏滨段智明向群
Owner SHANGHAI UNIV
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