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Cross cobalto-cobaltic oxide nanosheet array, gas sensor containing the array and application thereof

A technology of cobalt tetroxide nanometer and nanosheet array, applied in the field of sensors, can solve problems such as poor sensitivity, and achieve the effects of reducing reaction steps, lowering working temperature, and improving detection sensitivity

Active Publication Date: 2016-11-02
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In the prior art, the optimum operating temperature of a gas sensor capable of detecting acetone is usually above 200°C (for example, CN104950017A's Figure 4 It is reported that when the operating temperature is 200 °C, its sensitivity is higher than that at other operating temperatures, 200 °C as the optimal operating temperature of the device) or when the temperature is reduced, the sensitivity is poor (eg J Mater Sci: Mater Electron, 2015 , 15, 3995 reported that the prepared Co 3 o 4 Nanosheets, the sensitivity to 100ppm acetone at 160°C is only 6.1)

Method used

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  • Cross cobalto-cobaltic oxide nanosheet array, gas sensor containing the array and application thereof

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Effect test

Embodiment 1

[0071] The fabrication method of crossed cobalt trioxide nanosheet array of the present invention comprises the following steps:

[0072] 1) Mix and stir cobalt nitrate, urea, ammonium fluoride, trisodium citrate dihydrate and deionized water with a molar ratio of 10:5:5:1 at room temperature;

[0073] 2) the uniform solution obtained is moved into a stainless steel autoclave with a polytetrafluoroethylene lining, and the filling degree of the autoclave is 80%;

[0074] 3) Put the cleaned and electrode-plated insulating substrate in the solution, control the hydrothermal reaction temperature to 95°C, and the reaction time is 12 hours. The insulating substrate can be an insulating ceramic sheet, silicon sheet or glass Substrate;

[0075] 4) After the reaction is completed, the substrate is taken out and rinsed and dried with deionized water and ethanol respectively to obtain a precursor of tricobalt tetroxide;

[0076] 5) The obtained cobalt tetroxide precursor is heat-treate...

Embodiment 2

[0087] Comparative Example 2 (see RSC Advances, 2015, 5, 59976)

[0088] The manufacture method of tricobalt tetraoxide nanosheet, comprises the following steps:

[0089] 1) Dissolve 0.02mmol polyethylene glycol-polypropylene glycol-polyethylene glycol copolymer (ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol)) in 16.5mL ethanol and 1mL deionized water Stir to obtain a homogeneous solution;

[0090] 2) 0.5mmol of hexamethylenetetramine, 0.5mml of cobalt acetate and 13mL of ethylene glycol were dissolved in the solution obtained in step 1) and stirred evenly;

[0091] 3) The homogeneous solution obtained in step 2) was left to stand for 12 hours;

[0092] 4) Move the obtained homogeneous solution into a stainless steel autoclave lined with polytetrafluoroethylene, control the hydrothermal reaction temperature to 170°C, and the reaction time to be 2 hours;

[0093] 5) After the reaction is completed, the obtained turbid solution is centrifuged to obt...

Embodiment 3

[0122] The fabrication method of crossed cobalt trioxide nanosheet array of the present invention comprises the following steps:

[0123] 1) Mix and stir cobalt chloride, urea, ammonium fluoride, trisodium citrate dihydrate and deionized water with a molar ratio of 5:3:2:1 at normal temperature;

[0124] 2) the uniform solution obtained is moved into a stainless steel autoclave with a polytetrafluoroethylene lining, and the filling degree of the autoclave is 60%;

[0125] 3) Put the cleaned and electrode-plated insulating substrate in the solution, control the hydrothermal reaction temperature to 110°C, and the reaction time is 13 hours. The insulating substrate can be an insulating ceramic sheet, silicon sheet or glass Substrate;

[0126] 4) After the reaction is completed, the substrate is taken out and rinsed and dried with deionized water and ethanol respectively to obtain a precursor of tricobalt tetroxide;

[0127] 5) The obtained cobalt tetroxide precursor is heat-tre...

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Abstract

The invention discloses a cross cobalto-cobaltic oxide nanosheet array, a gas sensor containing the array and application thereof. The nanosheets in the special cross cobalto-cobaltic oxide nanosheet array cross with each other. The nanosheets have a mesoporous structure, and the highest sensitivity of 16.5 for selective detection of acetone at about 111 DEG C. The cross cobalto-cobaltic oxide nanosheet array overcomes the problem that traditional cobalto-cobaltic oxide nanosheet cannot directly generate array on an insulation substrate with only supporting effect, and has the advantages of low production cost, high efficiency, and simple and controllable operation. The cross cobalto-cobaltic oxide nanosheet array has open structure, large specific surface area and electron mobility, and can provide more space for the benefit of rapid adsorption and detachment of gas molecules, and significantly improve the gas sensitive properties of the material. The cross cobalto-cobaltic oxide nanosheet array has good stability; test is carried out every 3 days in 60 days; and after 20 times of test, the performance change rate is only + / - 8%. The invention is quite applicable to sensor, acetone detection and medical detection.

Description

technical field [0001] The invention belongs to the field of sensors, and in particular relates to a crossed tricobalt tetroxide nanosheet array, a gas sensor comprising the array and applications thereof. Background technique [0002] With the improvement of our country's socio-economic level and living standards, as well as the increase of life and work pressure, there are more and more sub-healthy people, and the susceptible groups of various diseases are becoming more and more young. In addition to nitrogen, oxygen and carbon dioxide, the gas exhaled by the human body also contains many other compounds. The content level of these compounds is an important indicator for judging the state of the body. For example, high levels of acetone in exhaled breath can indicate a high risk of diabetes, while higher than normal levels of nitric oxide in exhaled breath may indicate asthma. For this reason, non-invasive breath analysis instruments have great development potential in th...

Claims

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Application Information

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IPC IPC(8): G01N27/26
CPCG01N27/26
Inventor 朱丽萍张子悦文震
Owner ZHEJIANG UNIV
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