6533b836fe1ef96bd12a1513

RESEARCH PRODUCT

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

Jukka AumanenAndreas JohanssonWei Yen WoonYu Han WangYen Chien KuoYi Zhe HongPasi MyllyperkiöMika PetterssonChia Hao ChenHung Chieh TsaiLo-yueh Chang

subject

hapetusMaterials sciencekemiax-ray examinationBinding energyOxideEther02 engineering and technologyChemical vapor depositionchemistry010402 general chemistryPhotochemistry01 natural sciencesRedoxepoxylaw.inventionchemistry.chemical_compoundX-ray photoelectron spectroscopylawgrafeeniGeneral Materials Sciencefysiikkata116ta114GraphenegrapheneepoksiGeneral Chemistry021001 nanoscience & nanotechnology0104 chemical sciencesröntgenkuvausoxidation (active)chemistryreduction-oxidation processes0210 nano-technologyphysicsScanning probe lithography

description

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. version peerReviewed

yearjournalcountryeditionlanguage
2018-04-01Carbon
https://doi.org/10.1016/j.carbon.2017.12.047