Method for preparing pine-needle-shaped zinc oxide gas sensor

A gas-sensing sensor, zinc oxide technology, applied in the field of gas-sensing sensors, can solve problems such as no related reports, and achieve the effects of good gas-sensing performance, high sensitivity and fast stability

Inactive Publication Date: 2015-07-08
HARBIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, some literatures have reported that zinc oxide is prepared by biological template method, such as preparing mesoporous zinc oxide by using lignin as template, synthesizing nanorod zinc oxide by using paper as template and synthesizing hollow spherical zinc oxide by using coccus as template, etc., cotton fiber Compared with other templates, which are cheap, easy to obtain and environmentally friendly, there is no relevant report on the method of synthesizing the inorganic functional material zinc oxide using cotton fiber as a biological template

Method used

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  • Method for preparing pine-needle-shaped zinc oxide gas sensor
  • Method for preparing pine-needle-shaped zinc oxide gas sensor
  • Method for preparing pine-needle-shaped zinc oxide gas sensor

Examples

Experimental program
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Effect test

Embodiment 1

[0011] Sodium hydroxide solution with a molar concentration of 1mol / L is used to impregnate the cotton fiber for 10 hours and then dried at 90°C for later use. The treated cotton fiber is impregnated in a molar ratio of n (zinc nitrate): n (citric acid) = 4:1 to form 8 hours in the sol, and then dried at 60 ° C to form a gel, and finally the gel was heated to 400 ° C in a temperature-programmed furnace with a heating rate of 1 ° C / min and calcined for 2 hours to obtain pine needle-shaped zinc oxide;

[0012] Weigh 10 mg of the above-prepared pine needle-shaped zinc oxide and put it into an agate mortar, then add anhydrous ethanol and deionized mixed solution with a volume ratio of 1:1, grind for 20 minutes, and then evenly coat it in hydrochloric acid and ethanol for ultrasonic treatment On the alumina ceramic tube core, let it stand to dry for 10h;

[0013] The coated ceramic tube core was heated to 500°C for 3 hours at a temperature-programmed furnace at a rate of 3°C / min,...

Embodiment 2

[0016] Sodium hydroxide solution with a molar concentration of 3mol / L was used to impregnate the cotton fibers for 8 hours and then dried at 80°C for later use. The treated cotton fibers were impregnated in a molar ratio of n (zinc nitrate): n (citric acid) = 5:1 to form in the sol for 6 hours, then dried at 70°C to form a gel, and finally the gel was heated to 500°C in a temperature-programmed furnace at a rate of 3°C / min and calcined for 2 hours to obtain pine needle-shaped zinc oxide;

[0017] Weigh 1 mg of the above-prepared pine needle-shaped zinc oxide and put it into an agate mortar, then add anhydrous ethanol and deionized mixed solution with a volume ratio of 3:1, grind for 10 minutes, and then evenly coat it in hydrochloric acid and ethanol for ultrasonic treatment On the alumina ceramic tube core, let it stand to dry for 6h;

[0018] The coated ceramic tube core was heated to 450°C for 1 hour at a temperature-programmed furnace at a rate of 1°C / min, and then a resis...

Embodiment 3

[0020] Sodium hydroxide solution with a molar concentration of 6mol / L was used to impregnate the cotton fibers for 4 hours and then dried at 100°C for later use. The treated cotton fibers were impregnated in a molar ratio of n (zinc nitrate): n (citric acid) = 3:1 to form 4h in the sol, and then dried at 80°C to form a gel, and finally the gel was heated to 600°C in a temperature-programmed furnace with a heating rate of 5°C / min and calcined for 2h to obtain pine needle-shaped zinc oxide;

[0021] Weigh 20 mg of the above-prepared pine needle-shaped zinc oxide and put it into an agate mortar, then add anhydrous ethanol and deionized mixed solution with a volume ratio of 2:1, grind for 30 minutes, and then evenly coat it in hydrochloric acid and ethanol for ultrasonic treatment On the alumina ceramic tube core, let it stand to dry for 15 hours;

[0022] The coated ceramic tube core was heated to 550°C for 5 hours at a rate of 5°C / min in a temperature-programmed furnace, and a r...

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Abstract

The invention discloses a method for preparing a pine-needle-shaped zinc oxide gas sensor, and belongs to the technical field of gas sensors. The method disclosed by the invention comprises the following steps: as cotton fibers are taken as a template, synthesizing pine needle shaped zinc oxide with the gas-sensitive property by utilizing a sol-gel process and adjusting reaction parameters; and coating the prepared pine-needle-shaped zinc oxide on the outer surface of an alumina ceramic tube, thereby obtaining the gas sensor. According to the method disclosed by the invention, raw materials participating in the reaction are cheap and readily available, the method is environmentally friendly, easy to operate, high in product yield and good in gas sensitive property, and the prepared pine-needle-shaped zinc oxide has high sensitivity, selectivity, stability and rapid response-recovery time on ethanol gas.

Description

technical field [0001] The invention belongs to the technical field of gas sensors, in particular to a method for preparing a pine needle-shaped zinc oxide gas sensor. Background technique [0002] With the rapid development of modern science and technology, the scale of industrial production has expanded rapidly, and the types and quantities of flammable, explosive, toxic and harmful gases used and produced in the production process have also continued to increase. Once they leak, they will seriously pollute the environment and cause explosions. , fire and poisoning hazards. With the wide application of organic decorative materials and the improvement of the airtightness of residential structures, the health problems caused by indoor pollutant gases released in the home and work environment have also been paid more and more attention. In addition, the grade assessment and safe storage of agricultural products such as grain, vegetables and fruits, the preservation and stora...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/00
Inventor 张有科
Owner HARBIN UNIV
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