Otro
Burning Graphene Layer-by-Layer
Registro en:
Scientific Reports. London: Nature Publishing Group, v. 5, 9 p., 2015.
2045-2322
WOS:000356663700001
WOS000356663700001.pdf
Autor
Ermakov, Victor A.
Alaferdov, Andrei V.
Vaz, Alfredo R.
Perim, Eric
Autreto, Pedro A. S.
Paupitz, Ricardo
Galvao, Douglas S.
Moshkalev, Stanislav A.
Resumen
Graphene, in single layer or multi-layer forms, holds great promise for future electronics and high-temperature applications. Resistance to oxidation, an important property for high-temperature applications, has not yet been extensively investigated. Controlled thinning of multi-layer graphene (MLG), e.g., by plasma or laser processing is another challenge, since the existing methods produce non-uniform thinning or introduce undesirable defects in the basal plane. We report here that heating to extremely high temperatures (exceeding 2000 K) and controllable layer-by-layer burning (thinning) can be achieved by low-power laser processing of suspended high-quality MLG in air in "cold-wall" reactor configuration. In contrast, localized laser heating of supported samples results in non-uniform graphene burning at much higher rates. Fully atomistic molecular dynamics simulations were also performed to reveal details of oxidation mechanisms leading to uniform layer-by-layer graphene gasification. The extraordinary resistance of MLG to oxidation paves the way to novel high-temperature applications as continuum light source or scaffolding material.