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Cobaltosic oxide quantum dot and preparation method thereof

A technology of cobalt trioxide quantum and cobalt nitrate, which is applied in cobalt oxide/cobalt hydroxide, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of large particle size of cobalt tetraoxide nanocrystals, complex control of reaction conditions, and unsatisfactory conditions. Quantum confinement conditions and other issues

Active Publication Date: 2013-07-17
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to its violent and rapid reaction, this method requires high consistency of reaction conditions (see Chinese invention patent CN1837066)
[0016] From the above description of the prior art, it can be seen that the size of cobalt tetraoxide nanocrystals prepared by traditional methods is relatively large, which cannot meet the quantum confinement conditions. At the same time, some methods also have disadvantages such as complex control of reaction conditions and difficult separation of products.
These all limit the application of cobalt tetroxide materials in the field of photocatalysis

Method used

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  • Cobaltosic oxide quantum dot and preparation method thereof
  • Cobaltosic oxide quantum dot and preparation method thereof
  • Cobaltosic oxide quantum dot and preparation method thereof

Examples

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Effect test

Embodiment 1

[0040] 1) Cobaltous nitrate hexahydrate and ethanol are formulated into clear solution A according to the molar ratio of 1:50;

[0041] 2) Mix 1 ml of solution A with 30-40 ml of undecyl alcohol and add it to the PTFE lining of a 100 ml microwave hydrothermal kettle;

[0042] 3) According to the program: evenly heat up to 180 degrees Celsius within 8 to 10 minutes, keep warm at 180 degrees Celsius for 1 to 3 minutes, and perform microwave hydrothermal reaction. After cooling down, the reaction product was centrifuged at 10,000 rpm for 35 minutes, and the separated product was ultrasonically washed 3 times with ethanol, and then dried in a vacuum oven at 160 degrees Celsius for 8 hours.

Embodiment 2

[0044] 1) Cobaltous nitrate hexahydrate and propanol are formulated into clear solution A according to the molar ratio of 1:40;

[0045] 2) Mix 1 ml of solution A with 30-40 ml of dodecanol and add it to the PTFE lining of a 100 ml microwave hydrothermal kettle;

[0046] 3) According to the program: evenly heat up to 200 degrees Celsius within 8 to 10 minutes, keep warm at 200 degrees Celsius for 1 to 3 minutes, and perform microwave hydrothermal reaction. After cooling down, the reaction product was centrifuged at 10,000 rpm for 35 minutes, and the separated product was ultrasonically washed 3 times with ethanol, and then dried in a vacuum oven at 160 degrees Celsius for 8 hours.

Embodiment 3

[0048] 1) Cobaltous nitrate hexahydrate and n-butanol are formulated into clear solution A according to the molar ratio of 1:60;

[0049] 2) Mix 1 ml of solution A with 30-40 ml of tridecanol and add it to the PTFE lining of a 100 ml microwave hydrothermal kettle;

[0050] 3) According to the program: evenly heat up to 165 degrees Celsius within 8 to 10 minutes, keep warm at 165 degrees Celsius for 1 to 3 minutes, and perform microwave hydrothermal reaction. After cooling down, the reaction product was centrifuged at 10,000 rpm for 35 minutes, and the separated product was ultrasonically washed 3 times with ethanol, and then dried in a vacuum oven at 160 degrees Celsius for 8 hours.

[0051] The cobalt tetroxide quantum dot prepared by the method of the invention has a particle size of 3-4 nanometers and has obvious quantum confinement effect. Due to the small particle size of the synthesized cobalt tetroxide, it can be uniformly dispersed in water to form a brownish-yellow s...

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Abstract

The invention provides a cobaltosic oxide quantum dot and a preparation method thereof. The preparation method includes: using short-chain alcohol as surfactant to wrap hexahydrate cobalt nitrate so as to form settled solution A, using long-chain alcohol as solvent to be well mixed with settled solution A so as to form cobalt nitrate reverse micelle solution, subjecting cobalt nitrate reverse micelle solution to microwave reaction to promote hydrolysis and purification of cobalt nitrate, and separating materials after microwave reaction to obtain the cobaltosic oxide quantum dot. The cobaltosic oxide quantum dot prepared by the method is 3-4 nanometers in particle size, has evident quantum confinement effect, can be well dispersed in water to form colloid, and is capable of generating hydrogen and oxygen by resolving pure water according to standard mole ratio 2:1 under visible light without load and mixing. The cobaltosic oxide quantum dot is also applicable to fields of fluorescopy, electrocatalysis, chemical catalysis, super capacitors and novel batteries.

Description

technical field [0001] The invention belongs to the field of hydrogen energy preparation, and relates to a photocatalytic clean preparation technology of hydrogen energy, in particular to a quantum dot of tricobalt tetroxide and a preparation method thereof. Background technique [0002] With the depletion of fossil energy such as oil, coal, and natural gas, and the increasing environmental problems, the development and utilization of clean and renewable energy has become a topic that governments at home and abroad attach great importance to. At present, the most abundant energy on the earth is solar energy, and the average annual solar energy projected onto the earth's surface is as high as 1.05×10 18 kWh, equivalent to 1.3×10 6 Ton of standard coal, and the distribution of solar energy reserves is more even, and the geographical influence is small. Therefore, the development and utilization of solar energy has become a research focus of scholars at home and abroad. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/04B82Y30/00
Inventor 郭烈锦张宁
Owner XI AN JIAOTONG UNIV
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