View : 16 Download: 0

Structural evolution of graphene in air at the electrical breakdown limit

Title
Structural evolution of graphene in air at the electrical breakdown limit
Authors
Son J.Choi M.Choi H.Kim S.J.Kim S.Lee K.-R.Vantasin S.Tanabe I.Cha J.Ozaki Y.Hong B.H.Yang I.-S.Hong J.
Ewha Authors
양인상
SCOPUS Author ID
양인상scopus
Issue Date
2016
Journal Title
Carbon
ISSN
0008-6223JCR Link
Citation
vol. 99, pp. 466 - 471
Publisher
Elsevier Ltd
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
In application of graphene to real electronics, understanding the mechanism of the electrical breakdown of the graphene in harsh environments should precede many activities in tamed conditions. In this article, we report the unusual structural evolution of microbridge graphene in air near the electrical current-breakdown limit. In-situ micro-Raman study revealed that Joule heating near the electrical breakdown gave rise to a substantial structural evolution: A previously unknown broad amorphous-like and partially reversible phase at an on-and off-current of ∼3.0 × 108 A/cm2, which finally drove the phase to the electrical current-breakdown. Our calculations suggest that the phase originates from the broken symmetry caused by defect formations during Joule heating. In particular, these formations are bonds of carbon-oxygen and vacancies-oxygen. A collection of energetically favorable vacancies-oxygen pairs results in porous graphene, and its evolution can be the key to understanding how the breakdown starts and propagates in graphene under high current density in air. © 2015 Elsevier Ltd. All rights reserved.
DOI
10.1016/j.carbon.2015.11.075
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE