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Method for mass preparing hollow nano cages in high quality

A technology of carbon nanocage and hollow carbon, which is applied in the direction of nanotechnology, nanotechnology, nanostructure manufacturing, etc., can solve the problems of unfriendly reagents and toxic environment, and achieve the effect of low price, high purity, and easy recycling and reuse

Inactive Publication Date: 2008-10-15
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the above methods involve complex multi-step processes, and some processes use toxic or environmentally unfriendly reagents, there are more or less disadvantages in these processes

Method used

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  • Method for mass preparing hollow nano cages in high quality
  • Method for mass preparing hollow nano cages in high quality
  • Method for mass preparing hollow nano cages in high quality

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Example 1 Using benzene as a precursor, the reaction temperature is 670° C., and the reaction time is 60 minutes. Hollow carbon nanocages are prepared by in-situ template method.

[0050] Weigh a certain amount of basic magnesium carbonate and add it into the quartz tube, spread it evenly, put it into the central area of ​​the tube furnace, then repeatedly fill it with argon and evacuate it with a mechanical pump for 3-5 times. Under an argon atmosphere (50 sccm), the temperature was raised to 670° C. at a rate of 10° C. per minute, benzene vapor was introduced by bubbling method, and the reaction was carried out for 60 minutes. After the reaction, the furnace tube was lowered to room temperature under the protection of argon (50 sccm), and the powder was collected from the quartz tube, soaked in 1mol / L dilute hydrochloric acid for 1 hour, filtered, washed repeatedly with deionized water until neutral, 110 °C drying to obtain hollow carbon nanocages. Specific surface a...

Embodiment 2

[0051] Example 2 Using benzene as a precursor, the reaction temperature is 690° C., and the reaction time is 60 minutes. Hollow carbon nanocages are prepared by in-situ template method.

[0052] Weigh a certain amount of basic magnesium carbonate and add it to the corundum tube, spread it evenly, put it into the central area of ​​the tube furnace, and then repeatedly fill it with nitrogen and evacuate it with a mechanical pump for 3-5 times. Under a nitrogen atmosphere (50 sccm), the temperature was raised to 690° C. at a rate of 10° C. per minute, benzene vapor was introduced by bubbling, and the reaction was carried out for 60 minutes. After the reaction, the furnace tube was lowered to room temperature under the protection of nitrogen (50 sccm), and the powder was collected from the corundum tube, soaked in 0.1mol / L dilute hydrochloric acid for 12 hours, filtered, and washed repeatedly with deionized water until neutral, 110 °C drying to obtain hollow carbon nanocages. The...

Embodiment 3

[0053] Example 3 Using benzene as a precursor, the reaction temperature is 700° C., and the reaction time is 60 minutes. Hollow carbon nanocages are prepared by in-situ template method.

[0054] Weigh a certain amount of basic magnesium carbonate and add it into the ceramic tube, spread it evenly, put it into the central area of ​​the tube furnace, then repeatedly fill it with argon and evacuate it with a mechanical pump for 3-5 times. Under an argon atmosphere (50 sccm), the temperature was raised to 700° C. at a rate of 10° C. per minute, benzene vapor was introduced by bubbling, and the reaction was carried out for 60 minutes. After the reaction, the furnace tube was lowered to room temperature under the protection of argon (50 sccm), and the powder was collected from the ceramic tube, soaked in 10mol / L hydrochloric acid for 5 minutes, filtered, and washed repeatedly with deionized water until neutral, at 110°C drying to obtain hollow carbon nanocages. (See image 3 , F...

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Abstract

A method for mass production of high-quality hollow carbon nanocages comprises the following steps: 1) light magnesium carbonate or magnesium carbonate is added into a reaction tube and spread evenly, the tube is put into a tubular furnace, air is pumped out of the tube, inert gas such as N2 and Ar is injected; the reaction temperature is increased to 670 DEG C-900 DEG C, (C) source vapor is introduced, and reaction is carried out for 5 to 240 minutes under the protection of 10-500sccm inert gas atmosphere; the (C) source gas is led to the reaction area of the tubular furnace by the inert gas flow, carbonized on the surfaces of nano particles generated in situ, and covered to form a MgO@C structure; after the reaction, the temperature inside the reaction tube drops to the room temperature under the protection of the inert gas; 2) powder is collected from the reaction tube, dipped in sufficient hydrochloric acid or sulphuric acid for 5 to 720 minutes to remove the kernel of MgO, filtered, washed to neutrality by using deionized water, and dried to obtain the hollow carbon nanocages; and 3) the magnesium salt filtrate is recycled. The nanocages prepared by the method have high purity, and the price for the precursor is low, thereby facilitating recovery and reuse.

Description

technical field [0001] This patent relates to a method of preparing a large number of high-quality hollow cores by using basic magnesium carbonate (or magnesium carbonate) and carbon-containing organic substances such as benzene as precursors, and using basic magnesium carbonate or magnesium oxide nanoparticles produced by in-situ decomposition of magnesium carbonate as templates. carbon nanocage method. Background technique [0002] The novel structures and unique optical, electrical, and magnetic properties of carbon fullerenes and nanotubes have attracted widespread attention and stimulated interest in exploring other carbon nanostructures (R.H.Baughman, et al.Science 2002, 297 , 787). Hollow carbon nanocages are usually by-products formed during the preparation of carbon nanotubes, which have been overshadowed by the light of carbon nanotubes and have been neglected for a long time. However, this unique hollow nanostructure has unique physical and chemical properties. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02B82B1/00C01F5/02
Inventor 王喜章钱敏杰肖佩蒋湘芬蹇国强胡征
Owner NANJING UNIV
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