Variation in the c-axis conductivity of multi-layer graphene due to H2 exposure
| Autor: | Jaekyung Kim, Yun Suk Huh, Woochan Jung, Byung Hoon Kim, Cheol Hwan Kwak |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Hydrogen Graphene Analytical chemistry General Physics and Astronomy chemistry.chemical_element 02 engineering and technology Conductivity 021001 nanoscience & nanotechnology 01 natural sciences law.invention symbols.namesake chemistry law Chemisorption 0103 physical sciences Electrode symbols Physical and Theoretical Chemistry 010306 general physics 0210 nano-technology Raman spectroscopy Decoupling (electronics) Bar (unit) |
| Zdroj: | Physical chemistry chemical physics : PCCP. 18(23) |
| ISSN: | 1463-9084 |
| Popis: | The variation of the c-axis conductivity of a multilayer graphene (MLG) as a function of H2 pressure from vacuum to 20 bar has been investigated. MLG was connected to the electrodes vertically using a wet transfer process. After exposure to H2 gas pressure up to 20 bar, the chemisorption of dissociated atomic hydrogen on MLG affects its electrical and structural properties. The formation of C–H bonds causes a decoupling of graphene layers, and then interferes with charge transfer through the out of plane. As a result, the c-axis conductivity decreases. Furthermore, the electron doping effect and the decoupling of the layers were confirmed using Raman spectroscopy. Hydrogenated carbons induce a defect structure of MLG which results in the expansion of layers. We observed a 43.54% increase in the thickness of the MLG after H2 exposure using atomic force microscopy. |
| Databáze: | OpenAIRE |
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