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Carbon atom wire and process for preparing carbon nanotube and carbon atom wire by pyrolyzing solid-state carbon source

A technology of carbon nanotubes and solid carbon source, which is applied in the field of preparing carbon nanotubes and carbon atomic wires, can solve the problems of low yield of carbon nanotubes and the like, and achieve the effects of low price, low cost and high yield

Inactive Publication Date: 2003-02-19
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

From the transmission electron microscope photos they published, it can be seen that the products they obtained contain a large amount of impurities such as amorphous carbon, and the yield of carbon nanotubes is very low.

Method used

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  • Carbon atom wire and process for preparing carbon nanotube and carbon atom wire by pyrolyzing solid-state carbon source
  • Carbon atom wire and process for preparing carbon nanotube and carbon atom wire by pyrolyzing solid-state carbon source
  • Carbon atom wire and process for preparing carbon nanotube and carbon atom wire by pyrolyzing solid-state carbon source

Examples

Experimental program
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Embodiment 1

[0021] Embodiment 1, with 2g 0.2mol / L Fe (NO 3) 3 The solution was mixed with 3.5g of potato starch evenly, then added into a ceramic burning boat, vacuum dehydrated at room temperature for 1 hour, put into a tube furnace whose reaction tube could be isolated from the outside air, vacuumed, filled with Ar gas, and repeated three times to remove the original substance in the furnace tube. Some air, 30mL / min of Ar and 30mL / min of H under the pressure of 0.2Mpa 2 steady airflow. Raise the temperature to 500°C at a rate of 15°C / min, keep the temperature for 5 hours, then raise the temperature to 700°C at a rate of 15°C / min, cool down to room temperature naturally after 15 hours at a constant temperature, and stop the gas. Discharge, obtain product 1.0g. The obtained product without any purification is observed under the transmission electron microscope (TEM) in the morphology shown in Figure 10 . From the TEM image, it can be seen that impurities such as amorphous carbon are...

Embodiment 2

[0022] Embodiment 2: substantially the same as embodiment 1, but the reactant is cotton cellulose. Figure 11 It is the morphology of the product obtained in this example without any purification treatment under a transmission electron microscope. It can be seen from the TEM image that the product obtained is also of high purity, and the diameter of the obtained carbon nanotubes is also very uniform, about 20 nm.

Embodiment 3

[0023] Embodiment 3: reactant is 2.3g potato starch, the aqueous solution of 0.23g polyacrylic acid iron resin (wherein containing polyacrylic acid resin 76%, Fe0.034%, all the other are water) and 1.0g 2.0%Fe (NO 3 ) 3 , the post-treatment temperature is 800°C. Polyacrylic resin is polymerized by acrylic acid and styrene at a mass ratio of 4:1. This embodiment obtains product 0.63g. The morphology of the purified carbon atomic wires observed under the high-resolution transmission electron microscope (HRTEM) is shown in Fig. figure 1 . The X-ray diffraction (XRD) figure of the obtained carbon atom line after purification is shown in figure 2 . The photoelectron spectroscopy (XPS) figure of the obtained carbon atomic line after purification is shown in Figure 4 and Figure 6 . The Auger Electron Spectrum (AES) diagram of the obtained carbon atomic line after purification is shown in Figure 8 .

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Abstract

A carbon atom wire is disclosed, which is composed of carbon atoms linked to become a wire with 1.5-2 A for diameter, more than 95% of C content and less than 5% of O2 content. A process for preparing the carbon nanotubes and carbon atom wire by pyrolyzing solid carbon source is disclosed, which uses starch, cellulose, or polyacrylic resin as carbon source and transmission metal (Fe, Co, Ni or their alloys) as catalyst. Its pyrolysis includes decomposing at 450-600 deg.C in H2 or CO, post treating at 600-1000 deg.C and diluting by N2, Ar, or other inertial gases. Its advantages are high output rate and uniform diameter.

Description

technical field [0001] The present invention relates to providing a new substance that has not been reported so far - carbon atomic wires and a method for preparing carbon nanotubes and carbon atomic wires by using solid carbon-containing polymers as carbon sources and adopting pyrolysis and catalytic processes. Background technique [0002] Carbon nanotubes have only been discovered for about ten years, and their unique structures and properties have attracted widespread attention from scientists in many fields such as chemistry, physics, and materials science. It has very broad application prospects in the preparation of composite materials and nano-optoelectronic devices, electron field emission sources, energy storage, and catalysis. However, so far, carbon nanotubes still cannot be produced on a large scale at an acceptable price, which has become a bottleneck problem restricting its general application. How to prepare carbon nanotubes on a large scale at a lower cost ...

Claims

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Application Information

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IPC IPC(8): C01B31/02
Inventor 薛宽宏何春建陈巧玲蔡称心沈伟
Owner NANJING NORMAL UNIVERSITY
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