Reduction-oxidation dynamics of oxidized graphene: Functional group composition dependent path to reduction
| Autor: | Jukka Aumanen, Andreas Johansson, Wei Yen Woon, Yu Han Wang, Yen Chien Kuo, Yi Zhe Hong, Pasi Myllyperkiö, Mika Pettersson, Chia Hao Chen, Hung Chieh Tsai, Lo-Yueh Chang |
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| Rok vydání: | 2018 |
| Předmět: |
hapetus
Materials science kemia x-ray examination Binding energy Oxide Ether 02 engineering and technology Chemical vapor deposition chemistry 010402 general chemistry Photochemistry 01 natural sciences Redox epoxy law.invention chemistry.chemical_compound X-ray photoelectron spectroscopy law grafeeni General Materials Science fysiikka ta116 ta114 Graphene graphene epoksi General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences röntgenkuvaus oxidation (active) reduction-oxidation processes 0210 nano-technology physics Scanning probe lithography |
| Zdroj: | Carbon. 129:396-402 |
| ISSN: | 0008-6223 |
| DOI: | 10.1016/j.carbon.2017.12.047 |
| Popis: | 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 |
| Databáze: | OpenAIRE |
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