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 te

Method used

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

Examples

Experimental program
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Example Embodiment

[0070] Example 1

[0071] The manufacturing method of the crossed cobalt tetroxide 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 in a molar ratio of 10:5:5:1 at normal temperature;

[0073] 2) moving the obtained homogeneous solution into a stainless steel autoclave whose inner lining is polytetrafluoroethylene, and the filling degree of the reactor is 80%;

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

[0075] 4) after the reaction is completed, take out the substrate and wash and dry with deionized water and ethanol respectively to obtain a cobalt tetroxide precursor;

[0076] 5) heat treatment of the obta...

Example Embodiment

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

[0088] The preparation method of cobalt tetroxide nanosheets comprises the following steps:

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

[0090] 2) Dissolve 0.5 mmol of cyclohexamethylenetetramine, 0.5 mml of cobalt acetate and 13 mL of ethylene glycol in the solution obtained in step 1) and stir well;

[0091] 3) leaving the homogeneous solution obtained in step 2) to stand for 12h;

[0092] 4) moving the obtained homogeneous solution into a stainless steel autoclave whose inner lining is polytetrafluoroethylene, the control hydrothermal reaction temperature is 170 ° C, and the reaction time is 2 hours;

[0093] 5) after the reaction is completed, the obtained turbid liquid is centrifuged t...

Example Embodiment

[0121] Example 3

[0122] The manufacturing method of the crossed cobalt tetroxide 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 in a molar ratio of 5:3:2:1 at normal temperature;

[0124] 2) moving the obtained homogeneous solution into a stainless steel autoclave whose inner lining is polytetrafluoroethylene, and the filling degree of the reactor is 60%;

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

[0126] 4) after the reaction is completed, take out the substrate and wash and dry with deionized water and ethanol respectively to obtain a cobalt tetroxide precursor;

[0127] 5) heat treatment of the...

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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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