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Method for preparing carbon nano fiber

A carbon nanofiber and tellurium nanotechnology, applied in nanotechnology, nanotechnology, nanostructure manufacturing, etc., can solve the problem that the surface of the product is difficult to functionalize, and achieve the effect of mild preparation conditions, high application value, and simple process requirements

Inactive Publication Date: 2007-03-28
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The U.S. "Carbon" (Carbon, 1998, Volume 36, Pages 937-942) reported carbonization of paraformaldehyde at high temperature (700-850°C) and high pressure (10 MPa) to obtain carbon nanofibers. The reaction is carried out at a higher temperature, and the surface of the product is difficult to functionalize

Method used

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  • Method for preparing carbon nano fiber

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Embodiment 1

[0023] The tellurium nanowires synthesized in the prior art all have relatively large wire diameters and small specific surface areas. In the present invention, we adopt strong reducing agent (hydrazine hydrate), under relatively higher reaction temperature (160-200 ℃) and polymer surfactant polyvinylpyrrolidone exist, first hydrothermal synthesis has higher ratio Nanowires of semiconductor tellurium with a surface area and wire diameter of 4-9nm; then using the nanowires of semiconductor tellurium as a template, using sugar carbohydrates to synthesize carbon-coated tellurium nanocables at a lower temperature, as a preparation An intermediate product of carbon nanofibers; the tellurium core of the semiconductor tellurium nanocable is removed by oxidation, and finally carbon nanofibers are obtained.

[0024] 0.6g polyvinylpyrrolidone and 0.1107g Na 2 TeO 3 , placed in a reaction kettle with a capacity of 30ml, add 21ml of distilled water to dissolve, then add 1ml of hydrazine...

Embodiment 2

[0036] 0.2g polyvinylpyrrolidone and 0.1584gNa 2 TeO 3 , placed in a reaction kettle with a capacity of 30ml, add 21ml of distilled water to dissolve, then add 1ml of hydrazine hydrate and 2ml of ammonia water in sequence, stir, seal the reaction kettle, put it in an oven at 180°C, keep it for 8 hours, and cool it down to room temperature naturally. The obtained product was precipitated with 40ml of acetone, washed with distilled water and absolute ethanol several times in sequence to remove impurities, and obtained semiconductor tellurium nanowires.

[0037]Take 0.06 grams of tellurium nanowires, disperse them in 24ml of water, add 0.3 grams of β-cyclodextrin, stir and dissolve, then transfer to a 30ml reaction kettle, seal the reaction kettle, and place it in an oven at 180°C for 4 hours , cooled naturally to room temperature; the product was washed several times with distilled water and absolute ethanol, and after drying, a carbon-coated tellurium nanocable was obtained. ...

Embodiment 3

[0045] 1.2g polyvinylpyrrolidone and 0.0528gNa 2 TeO 3 , placed in a reaction kettle with a capacity of 30ml, add 21ml of distilled water to dissolve, then add 1ml of hydrazine hydrate and 2ml of ammonia water in turn, stir, seal the reaction kettle, put it in an oven at 190°C, keep it for 6 hours, and then naturally cool to room temperature ; The product obtained was precipitated with 40ml of acetone, and washed several times with distilled water and absolute ethanol in turn to remove impurities and obtain nanowires of semiconductor tellurium.

[0046] Take 2.4 mg of the above-mentioned tellurium nanowires, disperse them in 24 ml of water, add 7.5 g of glucose, stir to dissolve, transfer to a 30 ml reaction kettle, seal the reaction kettle, put it in an oven at 190°C for 8 hours, and cool it down to room temperature naturally ; The product was washed several times with distilled water and absolute ethanol, and then dried to obtain carbon-coated tellurium nanocables.

[0047...

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Abstract

The invention is a method of preparing carbon nano fibers, characterized in adopting hydrazine hydrate and high molecular surface active agnet polyvinylpyrrolidone to hydrothermally synthesize nano lines of semiconductor Te at 160-200DEG C; then adopting the nano lines as template and adopting carbohydrate to react at 160-220DEG C for 4-20 h and synthesizing carbon-coated Te nano cables as intermediate for preparing carbon nano fiber; and oxidizing to remove Te cores from the nano cables and obtaining the carbon nano fibers. And it avoids production of carbon balls in the carbonizing course, and the surfaces of the obtained carbon-coated Te nano cables and carbon nano fibers all have large numbers of functional groups. And it is relatively suitable for industrialized production.

Description

Technical field: [0001] The invention belongs to the technical field of nanomaterial preparation methods, and relates to low-temperature hydrothermal carbonization of sugar carbohydrates, in particular to a preparation method of carbon-coated tellurium nano-cables and carbon nano-fibers. Background technique: [0002] British "Natural Materials" (Nature Materials, 2002, Vol. 1, pp. 165-168) reported that methane was catalytically cracked by plasma in the presence of a transition metal catalyst, and carbon nanofibers could be obtained at room temperature. Similar to the problem of preparing carbon nanofibers by laser ablation, chemical vapor deposition, and plasma-enhanced chemical vapor deposition in the past, it is difficult to functionalize the surface of the product because the reaction is completed under high temperature and pressure. [0003] German "Advanced Materials" (Advanced materials, 2004, volume 16, pages 1636-1640) reported that under the catalysis of silver io...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02B82B3/00
Inventor 俞书宏钱海生
Owner UNIV OF SCI & TECH OF CHINA
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