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Carbon nano tube cladded with rare earth oxide and its preparation method and use

A rare earth oxide and carbon nanotube technology, applied in the field of carbon nanotubes, can solve the problems of difficult control, inability to use, random granularity, etc., and achieve the effects of easy separation and purification, less solvent consumption, and good permeability

Inactive Publication Date: 2005-03-09
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although there are so many attractive application prospects, there has been no experimental report on carbon nanotubes coated with rare earth oxide nanotubes, mainly because the melting point of rare earth oxides is very high (2300 ° C ~ 2400 ° C), and conventional chemical methods cannot be used. Vapor deposition (CVD) and other methods to prepare
In addition, although rare earth-carbon nanotube composites can be obtained by phase separation technology (Cao, L.; Chen, H.; Zhou, H.; Zhu, L.; Sun, J.; Zhang, X.; Xu, J. .; Wang, M.Adv.Mater.2003, 15, 909.), but the coated rare earth compound is discontinuous, low in efficiency, random granular, and difficult to control

Method used

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  • Carbon nano tube cladded with rare earth oxide and its preparation method and use
  • Carbon nano tube cladded with rare earth oxide and its preparation method and use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Add 100 mg of multi-walled carbon nanotubes to 20 ml of mixed acid of sulfuric acid and nitric acid (volume ratio is 3), sonicate for 2 hours, dilute with 100 ml of distilled water and filter, then wash with distilled water until neutral, vacuum and drying to obtain purified chopped carbon nanotubes with a diameter of 50-80 nanometers and a length of 0.5-5 micrometers.

[0031] use figure 1 device shown. Add 10 milligrams of purified carbon nanotubes and 2 milliliters of 5 wt % europium nitrate ethanol solution into a stainless steel high-pressure vessel 6, put it into a constant temperature tank 8, adjust the temperature controller 9 to keep the temperature constant at 35 ° C, and open the valve 3 and valve 5, inject carbon dioxide through the syringe pump 2, when the pressure of the barometer 4 reaches 9×10 6 After Pascal, close the valve 3, raise the temperature to 120°C, keep the pressure and temperature for 10 hours, then lower the temperature to room temperature...

Embodiment 2

[0034] By the preparation method of embodiment 1, the only difference is that the pressure of the stainless steel high pressure vessel is 1 × 10 6 Pascal, the coverage of the obtained carbon nanotubes is 20% or more. Purified chopped carbon nanotubes are obtained, the diameter of which is 40-70 nanometers, and the length is 1-4 micrometers. The cladding layer is discontinuous, and the purposes are the same as in Example 1.

Embodiment 3

[0036] According to the preparation method of Example 1, only the time of constant temperature and pressure is shortened from 10 hours to 3 hours, and the filling rate of the obtained carbon nanotubes is more than 30%. Purified short-cut carbon nanotubes are obtained, the diameter of which is 30-70 nanometers, and the length is 0.5-3 micrometers. The cladding layer is discontinuous, and the purposes are the same as in Example 1.

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Abstract

A RE oxide coated carbon nanotube used for preparing field emission device and nano-class photoelectric device features that the supercritical CO2 is used as poor solvent to separate polar RE nitrate from alcohol to uniformly be coated on the surface of carbon nanotube, and the RE nitrate is decomposed at proper temp to form a coated RE oxide layer on the surface of carbon nanotube.

Description

technical field [0001] The invention belongs to the field of carbon nanotubes, in particular to rare earth oxide-coated carbon nanotubes, a preparation method and application thereof. Background technique [0002] Due to its unique electrical and mechanical properties, carbon nanotubes have become a hotspot in basic scientific research and a candidate material with great potential for the preparation of nanoscale devices. The surface of carbon nanotubes is modified with organic, inorganic or biological materials, so that the physical and chemical properties of carbon nanotubes can be significantly changed (Azamian, B.; Davis, J.; Coleman, K.; Bagshaw, C.; Green, M.L.H.J.Am.Chem.Soc.2002, 124, 12664.), and endow carbon nanotubes with more new properties, making them more widely used. [0003] Rare earth oxides have been widely used in laser materials, phosphors, and catalysts due to their unique optical, electrical, and chemical properties. Rare e...

Claims

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Application Information

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IPC IPC(8): C01B31/02
CPCY02P20/54
Inventor 付磊刘志敏刘云圻韩布兴王佳秋胡平安曹灵超朱道本
Owner INST OF CHEM CHINESE ACAD OF SCI
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