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Related Experiment Video

Updated: Mar 17, 2026

Functionalization of Single-walled Carbon Nanotubes with Thermo-reversible Block Copolymers and Characterization by Small-angle Neutron Scattering

Functionalization of Single-walled Carbon Nanotubes with Thermo-reversible Block Copolymers and Characterization by Small-angle Neutron Scattering

Published on: June 1, 2016

Sorting centimetre-long single-walled carbon nanotubes.

Woo Jong Yu^1,2, Sang Hoon Chae³, Quoc An Vu^3,4

¹Department of Electronic and Electrical Engineering, Sungkyunkwan University, Suwon 16419, South Korea.

Scientific Reports

|August 2, 2016

Summary

This summary is machine-generated.

Researchers developed a new method to sort long metallic (m) and semiconducting (s) single-walled carbon nanotubes (SWCNTs). This technique enables centimeter-long sorted SWCNTs for advanced macro-scale electronic applications.

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Last Updated: Mar 17, 2026

Functionalization of Single-walled Carbon Nanotubes with Thermo-reversible Block Copolymers and Characterization by Small-angle Neutron Scattering

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Area of Science:

Materials Science
Nanotechnology
Electrical Engineering

Background:

Current methods for sorting single-walled carbon nanotubes (SWCNTs) are limited to micrometer lengths, hindering macro-scale applications.
Achieving high-performance electronics requires sorted metallic (m) and semiconducting (s) SWCNTs of significant length.

Purpose of the Study:

To develop a simple and effective method for sorting centimeter-long metallic and semiconducting SWCNTs.
To enable the use of long SWCNTs in macro-scale electronic devices.

Main Methods:

Selective electrochemical deposition of Nickel (Ni) particles onto metallic SWCNTs under positive gate bias.
Oxidation of Ni coating to create an insulating layer, differentiating metallic from semiconducting SWCNTs.
Oxygen plasma etching to remove semiconducting SWCNTs while protecting metallic SWCNTs coated with Ni.

Main Results:

Successfully sorted centimeter-long aligned metallic and semiconducting SWCNTs.
Demonstrated high on/off ratios (10^4-10^8) for sorted semiconducting SWCNTs.
Achieved an on/off ratio near 1 for sorted metallic SWCNTs.

Conclusions:

The developed method provides a pathway for producing long, sorted SWCNTs suitable for macro-scale electronics.
This technique overcomes previous length limitations, paving the way for improved SWCNT-based devices.
The selective Ni coating and etching process effectively separates metallic and semiconducting SWCNTs.