(2m, m) carbon nano tube horizontal array and preparation method thereof

A carbon nanotube, horizontal technology, applied in the field of carbon nanotube horizontal array and its preparation, can solve the problems of low growth efficiency, non-horizontal array, poor quality of carbon nanotubes, etc., and achieve high activity and high array effect

Active Publication Date: 2018-05-29
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In actual reports, although low temperature (about 700°C) can obtain carbon nanotubes with a certain chiral selectivity (less than 60%), the quality of carbon nanotubes is poor, and they cannot form a horizontal array.
In addition, the reported growth efficiency of monochiral (12,6) carbon nanotubes using solid alloy catalysts is very low. Although the obtained carbon nanotubes have high selectivity, they are still not in a horizontal array.
In summary, it is a great challenge to obtain horizontal arrays of carbon nanotubes with high chiral selectivity.

Method used

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  • (2m, m) carbon nano tube horizontal array and preparation method thereof
  • (2m, m) carbon nano tube horizontal array and preparation method thereof
  • (2m, m) carbon nano tube horizontal array and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0055] Embodiment 1, preparation (12,6) carbon nanotube horizontal array

[0056] in 4×6mm 2 On the single crystal α-alumina substrate, spin-coat a 0.05mM ethanol solution of ammonium molybdate on the single crystal substrate at a speed of 2500r / min, and then anneal at 1100°C for 8 hours to allow the catalyst precursor molybdenum Ammonium phosphate is fully oxidized and spread on a single crystal alumina substrate. The annealed substrate was placed in a reaction vessel at 450°C and reduced with 200 sccm of hydrogen for 10 minutes, and then raised to 850°C; the hydrogen was stopped, and 100 sccm of ethanol vapor (carried by argon) was introduced to grow for 30 minutes, and then the temperature was lowered to obtain 15 A root (12,6) carbon nanotube horizontal array, wherein the diameter of the carbon nanotube is 1.1-1.3 nm, and the length is 100-300 μm.

[0057] The chiral selectivity of the (12,6) carbon nanotube horizontal array prepared in this example reaches 90%.

[0058...

Embodiment 2

[0062] Embodiment 2, preparation (8,4) carbon nanotube horizontal array

[0063] in 4×6mm 2 On the single crystal α-alumina substrate, spin-coat 0.05mM ethanol solution of ammonium tungstate on the single crystal substrate at a speed of 2500r / min, and then anneal at 1000°C for 8 hours, so that the catalyst precursor tungsten Ammonium phosphate is fully oxidized and spread on a single crystal alumina substrate. The annealed substrate was placed in a reaction vessel at 800°C and reduced with 200 sccm of hydrogen for 5 minutes, and then raised to 850°C; the hydrogen was stopped, and 100 sccm of ethanol vapor (carried by argon) was introduced to grow for 15 minutes, and then the temperature was lowered to obtain 10 The root (8,4) carbon nanotube horizontal array, wherein the diameter of the carbon nanotube is 0.7-1.0 nm, and the length is 100-300 μm.

[0064] The chiral selectivity of the (8,4) carbon nanotube horizontal array prepared in this example reaches 80%.

[0065] The ...

Embodiment 3

[0068] The mechanism analysis of the catalyst preparation of embodiment 3, (2m, m) single-walled carbon nanotube horizontal array;

[0069] 1. Mechanism analysis and verification of catalyst monodisperse preparation of (2m, m) single-walled carbon nanotube horizontal arrays;

[0070] Carry out AFM surface analysis with spin-coated ammonium molybdate-loaded ammonium molybdate annealing obtained after the embodiment 1, as Figure 8 as shown, Figure 8 a) is the AFM image of the initial spin-coated ammonium molybdate precursor, after annealing, all disappear and disperse on the surface of the single crystal substrate, such as Figure 8 As shown in b), AFM shows hardly any catalyst particles on the surface of the substrate after annealing.

[0071] To further demonstrate the monodisperse process of catalyst precursors, different concentrations of ammonium molybdate were spin-coated on single crystal substrates, as Figure 9 As shown in a), 9b) and 9c), it can be seen that as th...

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Abstract

The invention discloses a (2m, m) carbon nano tube horizontal array and a preparation method thereof. The preparation method includes the following steps that ammonium salts are transferred to a base,then annealing treatment is carried out, and the ammonium salts are ammonium molybdate or tungstic acid ammonium; reduction of the ammonium salts is performed by using hydrogen; and carbon source gasis injected into a reaction vessel for growth after the reduction step is completed, and the (2m, m) carbon nano tube horizontal array is obtained. According to the (2m, m) carbon nano tube horizontal array, the diameter of a carbon nano tube is 0.7-1.3 nm and the length of the carbon nano tube is 100-300 [mu]m; a catalyst used in the (2m, m) carbon nano tube horizontal array is carbide which hashigher catalytic activity and the activity of the carbide is higher than an existing metal catalyst, and that is the key to obtain the carbon nano tube with higher density; the melting point of catalyst molybdenum carbide used in the (2m, m) carbon nano tube horizontal array is high and a solid form can be maintained, so that the carbon nano tube with extremely high chiral selectivity can be obtained; the single-crystal base is used as the growth base, since the single-crystal base has double symmetry, the carbon nano tube obtained by the growth has high arrayability.

Description

technical field [0001] The invention relates to a carbon nanotube horizontal array and a preparation method thereof, in particular to a (2m, m) carbon nanotube horizontal array and a preparation method thereof. Background technique [0002] Carbon nanotubes have rich structures and electronic energy bands, so they have great potential application value in many fields. However, one of the major problems hindering the practical application of carbon nanotubes is the controllable structure of carbon nanotubes. The preparation of carbon nanotubes with better uniformity and even monochirality is a huge challenge in the preparation of carbon nanotubes. At the same time, in nanoelectronics, carbon nanotubes are often required to be self-contained in a horizontal array, and the higher the density, the better. In actual reports, although carbon nanotubes with certain chiral selectivity (less than 60%) can be obtained at low temperature (about 700°C), the quality of carbon nanotubes ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C16/26C23C16/02B82Y40/00
CPCB82Y40/00C23C16/0272C23C16/26
Inventor 张锦张树辰
Owner PEKING UNIV
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