Carbon nanometer ring and preparation method thereof

A technology of carbon nano-rings and carbon rings, applied in the direction of nano-carbon, nano-technology, etc., can solve the problems of difficult stable existence, large damage of carbon tube structure, difficulty in obtaining ultra-short carbon nano-tubes, etc. simple effect

Active Publication Date: 2012-06-13
BEIJING UNIV OF CHEM TECH
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Problems solved by technology

[0004] X.Sun et al. (X.Sun, S.Zaric, D.Daranciang, K.Welsher, Y.Lu, X.Li, H.Dai, Optical properties of ultrashort semiconductor single-walled carbon nanotube capsules down to sub-10nm, J.Am.Chem.Soc., 2008, 130:6551) treated the sheared single-walled carbon nanotubes with a concentrated acid solution, and then used density gradient ultracentrifugation to separate them according to the length of the carbon tubes, and obtained a single-walled carbon nanotube with a length below 10 nanometers. Even carbon nanotubes close to 1 nanometer, but their length is still greater than or close to the radial dimension of single-walled carbon nanotubes, that is, the ratio of axial dimension to radial dimension is greater than or equal to 1, so they can only be called ultra-short carbon nanotubes
In addition, the treatment of sheared carbon nanotubes with concentrated acid will greatly damage the structure of carbon nanotubes, so it is difficult to obtain ultra-short carbon nanotubes with orderly edge structures.
[0005] H.Chun et al. (H.Chun, M.G.Hahm, Y.Homma, R.Meritz, K.Kuramochi, L.Menon, L.Ci, P.M.Ajayan, Y.J.Jung, Engineering Low-Aspect Ratio Carbon Nanostructures: Nanocups, Nanorings, and Nanocontainers, ACS Nano, 2009, 3: 1274) using anodized aluminum with short nanochannels as a template, carbon nanocups were prepared by chemical vapor deposition, and then the bottom of the cup was thinned and removed by ion sputtering to obtain a radial dimension Carbon nanorings with a diameter of 80 nanometers and an axial size of tens of nanometers, but usually the maximum diameter of multi-walled carbon tubes is about 30 nanometers, and it is difficult to exist stably under larger diameters; in addition, from the high-resolution electron microscope provided by H.Chun et al. According to the photo, the carbon nanoring does not have the structural characteristics of graphite sheets, so what it obtains is only a carbon film with a ring structure, which is similar to the closed ring body that is rolled up with graphite sheets in the present invention. The structure of carbon nanorings is different

Method used

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  • Carbon nanometer ring and preparation method thereof
  • Carbon nanometer ring and preparation method thereof
  • Carbon nanometer ring and preparation method thereof

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Embodiment 1

[0049] 0.075mol cobalt nitrate (Co(NO 3 ) 2 ·6H 2 O), 0.025mol aluminum nitrate (Al(NO 3 ) 3 9H 2 O), 0.025mol sodium dodecyl sulfate (dodecyl sulfate is abbreviated as DS - ) and 0.25mol methyl methacrylate (MMA) were dissolved in 300mL decarbonated deionized water, stirred and mixed for 20 minutes under nitrogen protection, to obtain a pink, clear and transparent mixed salt solution;

[0050] Under nitrogen protection and constant stirring, 80 mL of NaOH solution with a concentration of 2.5 mol / L prepared with decarbonated deionized water was added dropwise to the above mixed salt solution to obtain a mixed solution;

[0051] Under a nitrogen atmosphere, the above mixed solution was reacted at 80°C for 8 hours, the obtained suspension was filtered, the reaction product was washed with deionized water until the pH of the filtrate was 7.2, and then the filter cake was dried at 50°C for 12 hours, The layered bishydroxy compound metal oxide with intercalation structure was...

Embodiment 2

[0063] 0.025mol cobalt nitrate (Co(NO 3 ) 2 ·6H 2 O), 0.025mol magnesium nitrate (Mg(NO 3 ) 2 ·6H 2 O), 0.025mol aluminum nitrate (Al(NO 3 ) 3 9H 2 O), 0.025mol sodium dodecylsulfonate (dodecylsulfonate is abbreviated as DSO - ) and 0.75mol n-pentane (P) were dissolved in 150mL de-carbonated deionized water, stirred and mixed under nitrogen protection for 20 minutes to obtain a pink, clear and transparent mixed salt solution;

[0064] Under nitrogen protection and constant stirring, add dropwise 30 mL of NaOH solution with a concentration of 5 mol / L prepared with decarbonated deionized water into the above mixed salt solution to obtain a mixed solution;

[0065]Under a nitrogen atmosphere, the above mixed solution was reacted at 70°C for 10 hours, the resulting suspension was filtered, the reaction product was washed with deionized water until the pH of the filtrate was 7.5, and then the filter cake was dried at 60°C for 8 hours, The layered bishydroxy compound metal ...

Embodiment 3

[0076] 0.1mol zinc nitrate (Zn(NO 3 ) 2 ·6H 2 O), 0.01mol iron nitrate (Fe(NO 3 ) 3 9H 2 O), 0.015mol aluminum nitrate (Al(NO 3 ) 3 .9H 2 O), 0.025mol sodium dodecylbenzenesulfonate (dodecylbenzenesulfonate is abbreviated as DBS - ) and 0.5mol toluene (MB) were dissolved in 625mL decarbonated deionized water, stirred and mixed for 20 minutes under nitrogen protection, to obtain a yellow, clear and transparent mixed salt solution;

[0077] Under nitrogen protection and constant stirring, add 100 mL of NaOH solution with a concentration of 2.5 mol / L prepared with decarbonated deionized water to the above mixed salt solution dropwise to obtain a mixed solution;

[0078] Under a nitrogen atmosphere, the above mixed solution was reacted at 60°C for 6 hours, the resulting suspension was filtered, the reaction product was washed with deionized water until the pH of the filtrate was 7.0, and the filter cake was dried at 55°C for 6 hours to obtain The layered double hydroxyl c...

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Abstract

The invention relates to a carbon nanometer ring and a preparation method thereof, and belongs to the technical field of carbon nanometer materials. The carbon nanometer ring consists of a single layer or a plurality of layers of carbon rings, and the carbon rings have a structure which is similar to a closed ring body coiled by a graphite flake layer; and axial sizes and radial sizes of the carbon nanometer ring are a nanometer order, and the axial sizes are smaller than the radial sizes. The invention also provides a method for preparing the carbon nanometer ring. The method comprises the following steps of: roasting long-chain alkyl anions and a lamellar double-hydroxyl composition metal oxide of a carbon source molecular intercalation in the inertia or reducing atmosphere, growing thecarbon nanometer ring in interlaminar restricted domain space under the catalytic action of laminate metal elements, and removing metal and the metal oxide by acid dissolution to obtain the carbon nanometer ring. By the method, the axial sizes and radial sizes of the carbon nanometer ring and the layer number of the carbon ring can be controlled effectively. The carbon nanometer ring has a nanometer ring structure and the excellent performance of carbon materials, has more edge carbon and dangling bonds, and has a bright application prospect in fields of nanometer devices, energy storage, sensing and the like.

Description

technical field [0001] The invention belongs to the technical field of carbon nanomaterials, in particular to a carbon nanoring and a preparation method thereof. Background technique [0002] Nanoring is a new type of nanomaterial. The novel structure of nanoring can be used as an important structural unit in nanodevices. The unique and excellent performance of nanoring makes it show broad application prospects in the field of functional materials. A variety of nanorings have been synthesized, such as metal oxide nanorings, metal nanorings, and long-chain organic molecule nanorings. Nanorings have not been reported yet. [0003] J.Liu et al. (J.Liu, H.Dai, J.H.Hafner, D.T.Colbert, R.E.Smalley, Fullerene 'crop circles', Nature, 1997, 385:780) synthesized single-walled carbon nanotubes by laser method A carbon nanotube ring, the carbon nanotube ring is a ring formed by seamlessly connecting the end of the carbon nanotube. Although there are literatures that refer to this st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02B82Y40/00C01B32/15
Inventor 杨文胜孙洁刘海梅陈旭
Owner BEIJING UNIV OF CHEM TECH
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