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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Hammad, M.
in Cooperation with on an Cooperation-Score of 37%
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Publications (6/6 displayed)
- 2023Synthesis of novel LaCoO3/graphene catalysts as highly efficient peroxymonosulfate activator for the degradation of organic pollutants
- 2023Controlling mesenchymal stem cell differentiation using vanadium oxide thin film surface wettabilitycitations
- 2021Single layer graphene controlled surface and bulk indentation plasticity in coppercitations
- 2021Differentiation of mesenchymal stem cells using metal oxide thin filmscitations
- 2021Nanoscale control of oxides by laser ablation: design and applications
- 2010A laboratory evaluation of the physical and mechanical properties of selected root canal sealerscitations
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article
Single layer graphene controlled surface and bulk indentation plasticity in copper
Abstract
The impact of graphene reinforcement on the mechanical properties of metals has been a subject of investigation over the last decade in surface applications to mitigate the impact of tribological loadings or for strengthening purposes when dispersed into a bulk material. Here, the effect on the plastic indentation response of a single graphene layer grown on Cu is analyzed for two configurations: one with graphene at the surface, the other with graphene sandwiched under a 100 nm thick Cu cap layer. Nanoindentation under both displacement and load control conditions show both earlier and shorter popin excursions compared to systems without graphene. Atomic force microscopy reveals much smoother pileups with no slip traces in the presence of a surface graphene layer. The configuration with the intercalated graphene layer appears as an ideal elementary system to address bulk hardening mechanisms by indentation testing. Transmission electron microscopy (TEM) cross-sections below indents show more diffuse and homogenous dislocation activity in the presence of graphene. 3D dislocation dynamics simulations allow unraveling of the origin of these 3D complex phenomena and prove that the collective dislocation mechanisms are dominantly controlled by the strong back stress caused by the graphene barrier. These results provide a quantitative understanding of the impact of graphene on dislocation mechanisms for both surface and bulk applications, but with an impact that is not as large as anticipated from other studies or general literature claims.