Insights into graphene wettability transparency by locally probing its surface free energy
| Autor: | Tuza Olukan, Harry Apostoleris, Jin-You Lu, Srinivasa Reddy Tamalampudi, Chia-Yun Lai, Mariam Ali Al Mahri, Matteo Chiesa, Ibraheem Almansouri, Abdulrahman Al-Hagri |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Graphene Bilayer Nanotechnology 02 engineering and technology Chemical vapor deposition 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Exfoliation joint Surface energy 0104 chemical sciences law.invention symbols.namesake law Monolayer symbols General Materials Science Wetting van der Waals force 0210 nano-technology |
| Zdroj: | Nanoscale. 11:7944-7951 |
| ISSN: | 2040-3372 2040-3364 |
| DOI: | 10.1039/c9nr00155g |
| Popis: | In this work, we study the surface energy of monolayer, bilayer and multilayer graphene coatings, produced through exfoliation of natural graphite flakes and chemical vapor deposition. We employ bimodal atomic force microscopy and micro-Raman spectroscopy for high spatial resolution and large area scanning of force of adhesion on the regions of the graphene/SiO2 surface with different graphene layers. Our measurements show that the interface conditions between graphene and SiO2 dominate the experimentally observed graphene surface energy. This finding sheds new light on the controversy surrounding graphene transparency studies. By separating the surface energy into polar and non-polar interactions, our findings suggest that monolayer graphene is nearly van der Waals opaque but partially transparent (near 60%) to polar interactions, which is further supported by characterizing graphene on the copper surface and two levels of density functional theory simulation. In addition to providing quantitative insight into the surface interactions of complicated graphene coatings, this work demonstrates a new route to nondestructively monitor the interface between graphene and coated substrates. |
| Databáze: | OpenAIRE |
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