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Spiral carbon nanotube prepared through molten salt method and preparation method and application thereof

A carbon nanotube and helical technology, which is applied in the field of preparation of helical carbon nanotubes, can solve the problems of complex preparation methods, low product purity, and long time consumption, and achieve excellent hydrogen and oxygen evolution performance, large specific surface area, and good mechanical strength Effect

Inactive Publication Date: 2019-06-14
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing helical carbon nanotubes, which solves the problems of complicated preparation methods of helical carbon nanotubes, high temperature, long time consumption and low product purity.

Method used

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  • Spiral carbon nanotube prepared through molten salt method and preparation method and application thereof
  • Spiral carbon nanotube prepared through molten salt method and preparation method and application thereof
  • Spiral carbon nanotube prepared through molten salt method and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Embodiment 1: Preparation of Mn@N-CN-1 (no molten salt)

[0043] Preparation of Mn@N-CNT-1: Dissolve 0.2g of manganese nitrate and 1.562g of melamine in 40mL of ethanol, stir ultrasonically for 30 minutes, then spin evaporate at 45°C for 1h, and evaporate the ethanol to obtain a solid sealant. Put the obtained solid powder into a ceramic crucible, then place it in a tube furnace, pass nitrogen gas into the tube furnace from the inlet of the tube furnace, and after exhausting the air, fix the balloon on the gas outlet of the tube furnace on, to seal the air outlet. The temperature was raised to 800°C at a heating rate of 2.5°C / min and held at this temperature for 180 minutes. Then, at 5°C min -1 The cooling rate cooled the temperature to 30 °C. The resulting product was dissolved in 1M HNO 3 The solution was treated for 24 hours to remove unreacted manganese salts. After acid treatment, it was washed with water until the pH was neutral, and dried at 60 °C for 12 hou...

Embodiment 2

[0044] Example 2: Preparation of Mn@N-CN-2 (without ball milling)

[0045] Preparation of Mn@N-CNT-2: 0.2 g of manganese nitrate and 1.562 g of melamine were dissolved in 40 mL of ethanol, stirred ultrasonically for 30 minutes, and then rotated at 45 °C for 1 h to evaporate the ethanol. The obtained solid powder is simply mixed with 0.3163g of calcium chloride, and the particle size distribution of the raw materials is 90-200nm. Then put it into a ceramic crucible, and then place it in a tube furnace. Nitrogen is introduced into the tube furnace from the inlet of the tube furnace. After the air is exhausted, the balloon is fixed on the gas outlet of the tube furnace and sealed. gas outlet. The temperature was raised to 800°C at a heating rate of 2.5°C / min and held at this temperature for 180 minutes. Then, at 5°C min -1 The cooling rate cooled the temperature to 30 °C. The resulting product was dissolved in 1M HNO 3 The solution was treated for 24 hours to remove unreacte...

Embodiment 3

[0046] Example 3: Preparation of Mn@N-CNT-3 (ball milled for 6 hours)

[0047] Preparation of Mn@N-CNT-3: 0.2 g of manganese nitrate and 1.562 g of melamine were dissolved in 40 mL of ethanol, stirred ultrasonically for 30 minutes, and then rotated at 45 °C for 1 h to evaporate the ethanol. The obtained solid powder and 0.3163 g of calcium chloride were ball milled in a zirconium casserole at 6000 rpm for 6 hours, and the particle size of the raw material after ball milling was 200-400 nm. After that, put the mixture into a ceramic crucible, then place it in a tube furnace, pass nitrogen gas into the tube furnace from the inlet of the tube furnace, and after the air is exhausted, fix the balloon on the gas outlet of the tube furnace , to seal the air outlet. The temperature was raised to 800°C at a heating rate of 2.5°C / min and held at this temperature for 180 minutes. Then, at 5°C min -1 The cooling rate cooled the temperature to 30 °C. The resulting product was dissolved...

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Abstract

The invention provides a spiral carbon nanotube prepared through a molten salt method and a method thereof. Specifically, soluble molten salt is applied to a calcining process of manganese salt and melamine. As temperature rises, the melamine is carbonized into graphitic carbon nitride; carbon atoms and nitrogen atoms which are thermal decomposed by carbon nitride are gathered into manganese saltnano-particles under higher temperature and then precipitate to form a new graphitic layer sheet; and the graphitic layer sheet is curled so as to form the carbon nanotube. Compared with a straight carbon nanotube, the spiral carbon nanotube prepared by the invention is capable of displaying metallic and semiconductor behavior and displaying semimetallic behavior due to chirality of the spiral carbon nanotube and can serve as a superconductor. The spiral carbon nanotube has stable performances and can be applied to the fields of electromagnetic wave absorbing materials, bio-separation, water treatment, water detection, food safety detection, fully decomposed water, sensor fuel cells and the like.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a method for preparing helical carbon nanotubes by using a molten salt method. Background technique [0002] In 1993, Dunlap and Ihara first predicted a helical structure composed entirely of carbon atoms through theoretical calculations. And through molecular simulation and other means to prove that this helical structure composed of carbon five, carbon six and carbon seven rings is thermodynamically stable. The research and development of helical carbon nanotubes provides a material with new structures, properties and applications, and there are many promising applications in the field of macroscopic materials from micro-nano devices to composite reinforcements. [0003] The current methods of preparing carbon nanotubes: graphite arc method, floating catalytic method, laser steam method, pyrolysis polymer method, chemical vapor deposition. In addition to the che...

Claims

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Application Information

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IPC IPC(8): C01B32/16
Inventor 王辉董情王荣方傅云磊
Owner QINGDAO UNIV OF SCI & TECH
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