| Full text | |
| Author(s): |
Costa, Mariana C. F.
[1, 2]
;
Parra, Gustavo G.
[1]
;
Larrude, Dunieskys R. G.
[1]
;
Fechine, Guilhermino J. M.
[1]
Total Authors: 4
|
| Affiliation: | [1] Univ Prebiteriana Mackenzie, Mackenzie Inst Res Graphene & Nanotechnol MackGra, Rua Consolacao 896, BR-01302907 Sao Paulo, SP - Brazil
[2] Natl Univ Singapore, Ctr Adv 2D Mat CA2DM, Singapore 117546 - Singapore
Total Affiliations: 2
|
| Document type: | Journal article |
| Source: | Physical Chemistry Chemical Physics; v. 22, n. 29, p. 16672-16680, AUG 7 2020. |
| Web of Science Citations: | 1 |
| Abstract | |
The wettability of graphene has been a topic under constant discussion in the literature since 2012. In this work we measured the contact angle (CA) of six different types of substrates (glass, quartz, Si3N4, Si/SiO2, sapphire and Si) with varying dielectric constants and surface roughnesses in order to calculate the surface free energy of graphene films to evaluate how the wetting properties of graphene-coated substrates are changed according to the underlying substrate. We used a residual-free transfer process to remove the high-quality graphene (CVD-Gr) grown onto copper foil. Afterwards, we performed an inert thermal treatment (Ar, at 300 degrees C for 30 minutes) to remove airborne contaminants from the graphene surface and evaluate the roughness of substrates by atomic force microscopy, the advancing and receding contact angles of two liquids (water and ethylene glycol), hysteresis, and surface free energy (polar and dispersive components) calculations. The presence of high-quality monolayer graphene (free of any air contaminants, polymer residues,etc.) led to a common wettability behaviour for all coated surfaces, regardless of the nature of the underlying substrate. This result can be understood in terms of the screening of van der Waals and dipole interactions by the electrons in graphene. (AU) | |
| FAPESP's process: | 12/50259-8 - Graphene: photonics and opto-electronics: UPM-NUS collaboration |
| Grantee: | Antonio Helio de Castro Neto |
| Support Opportunities: | Research Projects - SPEC Program |
| FAPESP's process: | 14/22840-3 - Direct dry transfer of CVD graphene to 2D and 3D polymeric substrates |
| Grantee: | Guilhermino José Macêdo Fechine |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 16/22918-8 - Noncovalent functionalization of 2D nanostructures with organic molecules and carbon nanoparticles: a ternary system for energy application |
| Grantee: | Gustavo Gimenez Parra |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |