Preparation method for cobalt-doped zinc oxide gas-sensitive material and application thereof
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A technology of gas-sensing materials, zinc oxide, applied in the field of material chemistry and gas-sensing sensors, achieving the effects of good dispersion, high crystallinity, and simple preparation process
Inactive Publication Date: 2018-06-22
UNIV OF SHANGHAI FOR SCI & TECH
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Moreover, there is no research report on the combination of microwave, ultrasonic treatment and solvothermal method to synthesize cobalt-doped nano-zinc oxide. Compared with traditional nanomaterials...
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Embodiment 1
[0044] The preparation process of the nano-spherical cobalt-doped zinc oxide gas-sensitive material of the present invention is as follows:
[0045] (1) Dissolve 0.3g of polyvinylpyrrolidone (PVP) in 75ml of ethylene glycol (EG), and magnetically stir it to fully dissolve to form a transparent solution;
[0046] (2) then adding zinc acetate dihydrate to it, so that the concentration of zinc acetate is 0.09mol / l, magnetic stirring makes it fully dissolved to form a transparent solution;
[0047] (3) Add cobalt nitrate hexahydrate again, and now the mol ratio of cobalt nitrate hexahydrate and zinc acetate is 0.233, and magnetic stirring makes it fully dissolve to form a transparent red solution;
[0048] (4) Then the mixed solution was subjected to microwave treatment for 15 minutes at 500w microwave power, and 15 minutes for ultrasonic treatment at 360w ultrasonic power;
[0049] (5) Take an appropriate amount of reaction solution and place it in the reactor, so that the volum...
Embodiment 2
[0053] The preparation process of zinc oxide gas-sensing materials doped with different proportions of cobalt is as follows:
[0054] (1) A certain amount of polyvinylpyrrolidone (PVP) is dissolved in 75ml of ethylene glycol (EG), and magnetically stirred to fully dissolve it to form a transparent solution;
[0055] (2) then adding zinc acetate dihydrate to it, so that the concentration of zinc acetate is 0.09mol / l, magnetic stirring makes it fully dissolved to form a transparent solution;
[0056] (3) Add cobalt nitrate hexahydrate again, the mol ratios of cobalt nitrate hexahydrate and zinc acetate are respectively: 0.1, 0.075, 0.05 and 0.025, magnetic stirring makes it fully dissolve to form a transparent red solution;
[0057] (4) Then the mixed solution was subjected to microwave treatment for 15 minutes at a microwave power of 500w, and ultrasonic treatment for 15 minutes at an ultrasonic power of 360w;
[0058] (5) Take an appropriate amount of reaction solution and pl...
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Abstract
The invention discloses a preparation method for a cobalt-doped zinc oxide gas-sensitive material and application thereof, which relate to the technical fields of material chemistry and gas-sensitivesensors. Polyvinylpyrrolidone (PVP), zinc acetate and cobalt nitrate hexahydrate are dissolved in 75ml of ethylene glycol, wherein polyvinylpyrrolidone, the molecular weight of which is 400,000, is 0.3g, the molar ratio of cobalt nitrate hexahydrate to zinc acetate is between 0.025 and 0.233, and thereby the cobalt-doped nanoscale spherical zinc oxide gas-sensitive material is prepared. Because amicrowave-and-ultrasonic wave-co-assisted solvothermal method is adopted in the process of preparation, the cobalt-doped nanoscale spherical zinc oxide material has high detection sensitivity and goodselectivity; and the preparation method is simple and harmless to the environment, and effectively overcomes defects existing in the prior art, for example, preparation methods are complex and cost is higher and production process conditions are strict, and sensors have high working temperature, low response and recovery speed and short service lives.
Description
technical field [0001] The invention relates to a method for preparing a cobalt-doped zinc oxide gas-sensitive material, which is used for preparing a gas-sensitive sensor, and specifically relates to the technical fields of material chemistry and gas-sensitive sensor. Background technique [0002] At present, gas concentration detectors are widely used in people's daily life and production environment. It can effectively detect volatile organic compounds (VOCs) around us such as ethanol, formaldehyde, acetone, etc. As we all know, drunk driving is the chief culprit of traffic accidents. In order to prevent drunk driving, traffic police use gas concentration detectors to detect the alcohol concentration exhaled by drivers to prevent vicious traffic accidents. Formaldehyde, as the most harmful gas to human beings, is known as the indoor "killer". Newly renovated houses need to pass a gas detector to detect the content of formaldehyde in the indoor air to ensure the safety and...
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