Structural Reconstruction of Reduced Graphene

Yu Han Wang, Yi Zhe Hong, Lo Yueh Chang, Chia Hao Chen, Wei Yen Woon

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Micrometer-sized oxidation patterns were created in chemical vapor deposition grown multilayered, non-Bernal stacked graphene through scanning probe lithography. The oxidized patterns were then reduced by irradiation using a focused X-ray beam. The topographical, structural, and chemical modifications of the oxidized graphene were characterized through atomic force microscopy, micro-Raman spectroscopy, and micro-X-ray photoelectron spectroscopy, respectively, before and after reduction of the oxidized patterns. For multilayered graphene (MLG), we found that oxidation only occurs for the first outermost layer. Furthermore, it was found that while the oxygen functional groups were almost completely removed by the reduction process, the restoration to a two-dimensional honeycomb structure of the reduced graphene was dependent on the number of layers. Notably, structural restoration is more effective for MLG, as compared to the single-layered counterpart. The mechanism of structural restoration is discussed in the light of solid-phase epitaxial regrowth.

Original languageEnglish
Pages (from-to)15786-15791
Number of pages6
JournalJournal of Physical Chemistry C
Volume122
Issue number27
DOIs
StatePublished - 12 Jul 2018

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