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Closed-edged graphene nanoribbons from large-diameter collapsed nanotubes
Chenguang Zhang1, Ksenia Bets, Seung Soo Lee
1Department of Chemistry and Richard E. Smalley Institute for Nanoscale Science and Technology, Rice University, 6100 Main Street, Houston, Texas 77005, United States.
ACS Nano
|June 9, 2012
Summary
The study reveals how carbon nanotube diameter affects their collapse into graphene nanoribbons. Experimental data and simulations pinpoint specific diameters where single- and double-walled nanotubes reach energy equivalence.
Area of Science:
- Materials Science
- Nanotechnology
- Condensed Matter Physics
Background:
- Carbon nanotubes (CNTs) are allotropes of carbon with a cylindrical nanostructure.
- The structural transformation of CNTs under specific conditions is of significant scientific interest.
- Graphene nanoribbons (GNRs) are derived from graphene and possess unique electronic properties.
Purpose of the Study:
- To experimentally determine the diameter dependence of single- and double-walled carbon nanotube collapse.
- To compare experimental findings with theoretical predictions for the formation of closed-edge graphene nanoribbons (CE(x)GNRs).
- To identify the energy equivalence points for the collapse of different types of CNTs.
Main Methods:
- Transmission Electron Microscopy (TEM) and Atomic Force Microscopy (AFM) were employed for nanotube characterization.
- CNTs were grown using preformed 4.0 nm diameter aluminum-iron oxide particles.
- Molecular dynamics simulations were utilized to model the collapse behavior and van der Waals interactions.
Main Results:
- Experimental data established energy equivalence points at 2.6 nm for single-walled CNTs and 4.0 nm for double-walled CNTs.
- These diameters correspond to the transition point where the energy of a round nanotube equals that of a fully collapsed structure.
- Molecular dynamics simulations corroborated these findings, predicting similar energy equivalence diameters.
Conclusions:
- The diameter of carbon nanotubes critically influences their transformation into graphene nanoribbons.
- The energy equivalence point serves as a key parameter in understanding nanotube structural stability and collapse.
- The study validates theoretical models for CNT collapse using experimental evidence and simulations.
