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Fabrication of Three-Dimensional Graphene-Based Polyhedrons via Origami-Like Self-Folding

Fabrication of Three-Dimensional Graphene-Based Polyhedrons via Origami-Like Self-Folding

Published on: September 23, 2018

Hydrogen-free graphene edges.

Kuang He¹, Gun-Do Lee², Alex W Robertson¹

¹Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK.

Nature Communications

|January 14, 2014

Summary

This summary is machine-generated.

Graphene edges can exist without hydrogen termination, featuring a contracted triple bond. Temporary atom attachment causes bond expansion, but the edge returns to its stable, non-functionalized state in vacuum.

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Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Graphene nanoribbon properties are dictated by edge structure and functionalization.
Theoretical studies suggest hydrogen termination stabilizes graphene edges.
Experimental evidence on edge termination is limited.

Purpose of the Study:

To experimentally investigate the termination state of graphene edges produced by sputtering.
To determine if graphene edges are always hydrogen-terminated in vacuum.
To understand the structural and electronic properties of non-functionalized graphene edges.

Main Methods:

Sputtering graphene in a vacuum environment.
Direct measurement of C-C bond lengths at graphene edges.
Density Functional Theory (DFT) calculations.
Time-dependent imaging of atomic interactions at the edge.

Main Results:

Observed an ~86% contraction in C-C bond lengths at sputtered graphene edges.
DFT calculations attributed contraction to triple bond formation and lack of hydrogen.
Time-dependent images showed temporary atomic attachment causing bond expansion, followed by relaxation.

Conclusions:

Confirmed that non-functionalized graphene edges can exist in a vacuum.
Demonstrated that sputtered graphene edges form stable, contracted triple bonds.
Provided experimental insight into the dynamic behavior of atoms at graphene edges.