A kind of preparation method of three-dimensional porous zno nano flake gas-sensing material and gas-sensing element

A technology of three-dimensional porous and gas-sensing materials, which is applied in the field of preparation of three-dimensional porous ZnO nanosphere gas-sensing materials and gas-sensing elements, can solve the problems of poor repeatability, low sensitivity and instability of acetone sensors, and achieve low operating temperature and high response - Fast recovery time, good selective effect

Active Publication Date: 2016-02-24
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide an acetone sensor with fast response, high sensitivity and low operating temperature for the acetone sensor, which has the disadvantages of low sensitivity, poor repeatability and instability, and requires a higher selectivity for acetone gas. A novel gas-sensing material and a method for preparing a gas-sensing element

Method used

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  • A kind of preparation method of three-dimensional porous zno nano flake gas-sensing material and gas-sensing element
  • A kind of preparation method of three-dimensional porous zno nano flake gas-sensing material and gas-sensing element
  • A kind of preparation method of three-dimensional porous zno nano flake gas-sensing material and gas-sensing element

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Embodiment 1

[0023] A preparation method of a three-dimensional porous ZnO nano-sphere gas-sensitive material. Firstly, a three-dimensional ZnO nano-sphere material is synthesized by a hydrothermal method. Into the mixed solution of deionized water and absolute ethanol, wherein the volume ratio of deionized water and absolute ethanol is 1:3 and the amount of deionized water required for every 1mmol dihydrate zinc chloride and 1mmol urea is 10~15ml , then add polyvinylpyrrolidone under stirring, the ratio of the amount of polyvinylpyrrolidone to zinc chloride dihydrate is 1.8~2:1, keep stirring for 30~40min, then transfer the mixed solution to the autoclave And put it into a drying box and raise the temperature to 180~200°C for 16~20h. After the reaction, wait for the reaction kettle to cool down to room temperature naturally, and centrifuge and wash the precipitate 3~5 times with a mixture of deionized water and absolute ethanol. Place it in a vacuum drying oven at 70°C for drying to obtai...

Embodiment 2

[0026] A kind of preparation method of three-dimensional porous ZnO nano flake gas-sensitive material, at first utilize hydrothermal method to synthesize three-dimensional ZnO nano flake material, the steps are as follows: accurately weigh 1mmol (0.1363g) of zinc chloride (ZnCl 2 2H 2 O) and 1mmol (0.6000g) of urea (CO(NH 2 ) 2 ), dissolve them into 10ml of deionized water and 30mL of absolute ethanol, form a uniform and stable solution under vigorous stirring, then add 0.2000g of polyvinylpyrrolidone (PVP) under stirring, and stir for 30min to All the solids were dissolved, and then the mixed solution was transferred to a polytetrafluoroethylene-lined autoclave, and placed in a drying oven to raise the temperature to 180°C for 16 hours. After the reaction, the autoclave was naturally cooled to room temperature, and the precipitate was used Deionized water and absolute ethanol were centrifuged and washed several times, and dried in a vacuum oven at 70°C to obtain a white pow...

Embodiment 3

[0029] A kind of preparation method of three-dimensional porous ZnO nano flake gas-sensitive material, at first utilizing hydrothermal method to synthesize three-dimensional ZnO nano flake material, the steps are as follows: dissolve 2mmol zinc chloride dihydrate and 2mmol urea into 20ml deionized water and 60ml In the mixed solution of absolute ethanol, add 3.6mmol polyvinylpyrrolidone under stirring, continue to stir for 40min until all solids are dissolved, then transfer the mixed solution to a high-pressure reactor and put it in a drying oven to heat up to 200°C for reaction After 16 hours, after the reaction, the reaction kettle was naturally cooled to room temperature, and the precipitate was centrifuged and washed 3 to 5 times with a mixture of deionized water and absolute ethanol, and dried in a vacuum drying oven at 70°C to obtain a white The powdery precursor is the three-dimensional ZnO nanosheet material; then the nanosheet material is calcined at 300°C for 2 hours to...

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Abstract

The invention discloses preparation methods for a three-dimensional porous ZnO nano sheet ball gas sensitive material and a gas sensitive element. The preparation methods for the three-dimensional porous ZnO nano sheet ball gas sensitive material and the gas sensitive element comprise the following steps: synthesizing a three-dimensional porous ZnO nano sheet ball material by using a hydrothermal method; calcining the nano sheet ball material under the condition of 300-600 DEG C for 2 hours to obtain a nano sheet ball; grinding the sheet ball in a mortar and calcining at 400-700 DEG C to obtain the three-dimensional porous ZnO nano sheet ball gas sensitive material; sufficiently grinding the three-dimensional porous ZnO nano sheet ball gas sensitive material in terpilenol; coating the material on the surface of an aluminum oxide ceramic tube; baking in a drying oven for 0.5-5 hours; calcining in a muffle furnace at 400-700 DEG C; welding, charging and aging to obtain the porous ZnO nano sheet ball gas sensitive element. According to the preparation methods, the sensitivity of 100ppm of acetone reaches 145.9, the sensitivity of 50ppm of the acetone gas is up to 62, and the sensitivity of 10ppm of the acetone gas reaches 14; the operation temperature is low, the responding-recovering time is rapid and the selectivity is high.

Description

technical field [0001] The invention relates to a preparation method of a three-dimensional porous ZnO nano ball gas-sensing material and a gas-sensing element. Background technique [0002] Acetone is a commonly used organic reagent, which is easily oxidized in the air, and a large amount of oxygen in the air is consumed during the oxidation process, which is a harmful air pollutant. Acetone is also a flammable, explosive, toxic and highly volatile liquid with a lower explosion limit of only 2.6%. It is reported that acetone vapor will dissolve in the blood, which can stimulate the central nervous system of a person, causing fatigue, headache, vomiting, and even The poisoning symptom of coma is a kind of poisonous gas, which has a serious threat to human health and the environment. At the same time, acetone is also a bioprobe molecule for type I diabetes, and can be used to diagnose type I diabetes non-destructively by checking its concentration in the gas exhaled by the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/00
Inventor 李峰巩飞龙肖元化张爱勤张永辉韩莉锋赵继红
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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