Reduction-oxidation dynamics of oxidized graphene: Functional group composition dependent path to reduction

Yi Zhe Hong, Hung Chieh Tsai, Yu Han Wang, Jukka Aumanen, Pasi Myllyperkiö, Andreas Johansson, Yen Chien Kuo, Lo Yueh Chang, Chia Hao Chen, Mika Pettersson, Wei Yen Woon

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Micrometer-sized oxidation patterns containing varying composition of functional groups including epoxy, ether, hydroxyl, carbonyl, carboxyl, were created in chemical vapor deposition grown graphene through scanning probe lithography and pulsed laser two-photon oxidation. The oxidized graphene films were then reduced by a focused x-ray beam. Through in-situ x-ray photoelectron spectroscopy measurement, we found that the path to complete reduction depends critically on the total oxygen coverage and concentration of epoxy and ether groups. Over the threshold concentrations, a complex reduction-oxidation process involving conversion of functional groups of lower binding energy to higher binding energy is observed. The experimental observation is discussed and compared to previous work on reduced graphene oxide.

Original languageEnglish
Pages (from-to)396-402
Number of pages7
JournalCarbon
Volume129
DOIs
StatePublished - Apr 2018

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