Method for growing vertically oriented single-walled carbon nanotubes with the same electronic properties and for reproducing single-walled carbon nanotubes with the same electronic properties

Patent metadata

Field	Value
Publication number	US-2017137935-A1
Application number	US-201515321861-A
Country	US
Kind code	A1
Filing date	Jun 24, 2015
Priority date	Jun 24, 2014
Publication date	May 18, 2017
Grant date	—

Abstract

The present invention relates to a method of reproducing at least one single-walled carbon nanotube ( 3 ) having predefined electronic properties or a plurality of single-walled carbon nanotube ( 3 ) having the same electronic properties. A dispersion ( 2 ) is produced for this purpose and carbon nanotubes ( 3 ) contained in the dispersion are processed into fragments ( 6 ) by energy input. These fragments ( 6 ) are applied to and oriented on a carrier ( 7 ). The fragments ( 6 ) are subsequently extended by chemical vapor deposition and the originally present carbon nanotubes ( 3 ) are thus reproduced.

First claim

1 . A method of reproducing at least one single-walled carbon nanotube ( 3 ) having predefined electronic properties or a plurality of single-walled carbon nanotubes ( 3 ) having the same electronic properties, the method comprising the steps:
a) preparing a dispersion ( 2 ) from a liquid and from the at least one single-walled carbon nanotube ( 3 ) having predefined electronic properties or from the plurality of single-walled carbon nanotubes ( 3 ) having the same electronic properties; b) forming fragments ( 6 ) of the at least one single-walled carbon nanotube ( 3 ) or of the plurality of single-walled carbon nanotubes ( 3 ) by an energy input into the dispersion ( 2 ); c) applying the fragments ( 6 ) of the at least one single-walled carbon nanotube ( 3 ) or of the plurality of single-walled carbon nanotubes ( 3 ) from the dispersion ( 2 ) onto a surface ( 8 ) of a carrier ( 7 ) as a starting layer for reproducing and orienting the fragments ( 6 ) on the surface ( 8 ) during the application from the dispersion ( 2 ) so that the surface ( 8 ) is intersected by a longitudinal axis of the fragments ( 6 ) and the fragments ( 6 ) are not oriented in parallel in a plane with respect to the surface ( 8 ) of the carrier ( 7 ); and d) introducing the fragments ( 6 ) applied to and oriented on the carrier ( 7 ) into an apparatus for chemical vapor deposition ( 9 ), with single-walled carbon nanotubes ( 3 ) having the same electronic properties being extended in the apparatus for chemical vapor deposition ( 9 ), starting from the fragments ( 6 ) serving as the starting layer, in a gas atmosphere containing carbon by means of chemical vapor deposition.

2 . A method in accordance with claim 1 , characterized in that the fragments ( 6 ) are formed by introduction of ultrasound into the dispersion ( 2 ), with fragments ( 6 ) having a length between 30 nm and 100 nm preferably being obtained.

3 . A method in accordance with claim 2 , characterized in that ultrasound is used having a power of 30 W to 100 W at a frequency between 20 kHz and 40 kHz.

4 . A method in accordance with claim 1 , characterized in that the fragments ( 6 ) are oriented on the surface ( 8 ) by application of an electrical field.

5 . A method in accordance with claim 1 , characterized in that the fragments ( 6 ) are oriented by self-organization on a gold layer applied to the surface ( 8 ) of the carrier ( 7 ), with SH(CH 2 ) n NH 2 molecules preferably being used for the orientation.

6 . A method in accordance claim 1 , characterized in that the longitudinal axis of the applied fragments ( 6 ) has an angle with respect to the surface between 60° and 120°, preferably between 75° and 105°, particularly preferably between 80° and 100°, with the carrier ( 7 ) preferably being a silicon oxide substrate.

7 . A method in accordance with claim 1 , characterized in that plasma-assisted chemical vapor deposition is used to extend the carbon nanotubes ( 6 ).

8 . A method in accordance with claim 1 , characterized in that the carbon nanotubes ( 3 ) used for reproduction have the same diameter and the same chirality.

9 . A method in accordance with claim 1 , characterized in that the dispersion ( 2 ) is prepared from water, preferably from distilled water, and from a surface-active substance, preferably a surfactant, for producing a homogeneous dispersion.

10 . A method in accordance with claim 1 , characterized in that the produced carbon nanotubes ( 3 ) having the same electronic properties are removed from the carrier ( 7 ) and the method is carried out again using these removed carbon nanotubes ( 3 ) for a further reproduction of the carbon nanotubes ( 3 ).

11 . A method in accordance with claim 1 , characterized in that the single-walled carbon nanotubes are formed with a diameter between 0.6 nm and 2 nm.

12 . A method in accordance with claim 1 , characterized in that the reproduced carbon nanotubes ( 3 ) are preferably measured with respect to their properties by optical absorption spectroscopy, Raman spectroscopy and/or a photoluminescence measurement after the growing by chemical vapor deposition and carbon nanotubes ( 3 ) differing from the desired properties are separated.

13 . A method in accordance with claim 1 , characterized in that the carbon nanotubes ( 3 ) are manufactured with a packing density of up to 10,000 carbon nanotubes per μm 2 , preferably of up to 20,000 carbon nanotubes per μm 2 , and particularly preferably of up to 40,000 carbon nanotubes per μm 2 .

14 . A method in accordance with claim 1 , characterized in that the carbon nanotubes ( 3 ) and/or the fragments ( 6 ) of the carbon nanotubes ( 3 ) are arranged on the carrier ( 7 ) with a spacing from one another of less than 0.5 μm.

15 . A carrier ( 7 ) having a surface ( 8 ) on which single-walled carbon nanotubes ( 3 ) having the same electronic properties are applied such that a longitudinal axis of the carbon nanotubes ( 3 ) intersects the surface ( 8 ) and the carbon nanotubes ( 3 ) are not oriented in parallel in a plane with respect to the surface ( 8 ) of the carrier ( 7 ).

16 . A carrier ( 7 ) having a surface ( 8 ) on which fragments ( 6 ) of the at least one single-walled carbon nanotube ( 3 ) are applied and are oriented such that a longitudinal axis of the fragments ( 6 ) of the at least one carbon nanotube ( 3 ) intersects the surface ( 8 ) and the fragments ( 6 ) of the at least one carbon nanotube ( 3 ) are not oriented in parallel in a plane with respect to the surface ( 8 ) of the carrier ( 7 ).

17 . A carrier ( 7 ) in accordance with claim 16 , characterized in that a surfactant layer ( 9 ) is applied to the surface ( 8 ) and the fragments ( 6 ) of the at least one single-walled carbon nanotube ( 3 ) are applied to and oriented on it.

18 . A carrier ( 7 ) in accordance with claim 17 , characterized in that the surfactant layer ( 9 ) has a thickness that is less than a length of the fragments ( 6 ).

19 . A carrier ( 7 ) in accordance with claim 15 , characterized in that the surface ( 8 ) of the carrier ( 7 ) is provided with a gold layer on which the fragments ( 6 ) of the at least one single-walled carbon nanotube ( 3 ) are applied and oriented, with the surface ( 8 ) preferably being provided with a layer of SH(CH 2 ) n NH 2 molecules for the orientation.

Assignees

• Univ Dresden Tech
• Univ Dresden Tech

Inventors

• Bezugly Viktor
• Bezugly Eugenia
• Khavrus Vyacheslav
• Krylov Denis
• Cuniberti Gianaurelio

Classifications

• B82Y40/00

  Manufacture or treatment of nanostructures · CPC title

• C23C16/455

  characterised by the method used for introducing gases into reaction chamber or for modifying gas flows in reaction chamber · CPC title

• C01B2202/02

  Single-walled nanotubes · CPC title

• C01B2202/20

  Nanotubes characterized by their properties · CPC title

• Y10S977/932

  for electronic or optoelectronic application · CPC title