Oxidized nano-graphene (nGO, lateral size about 200 nm) was synthesized from graphene nanoplatelets to evaluate the effect of sheet size and oxidation degree on self-assembly behaviour, adsorption and barrier properties of graphene. nGO samples having O/C atomic ratios between 0.11 and 0.49 were obtained. nGO water dispersions showed good stability and were effective to adsorb organic dyes. Bulk and porous self-assembled nGO samples were prepared through water evaporation and freeze-drying, respectively. For both processes, only higher oxidation degrees yielded self-standing structures. Nitrogen adsorption measurements demonstrated that self-assembly by water evaporation of highly oxidized graphene resulted in a relevant reduction of the BET specific surface area (about 2 m2/g), while freeze-drying promoted the formation of interconnected structures with higher BET specific surface area (about 120 m2/g). Barrier properties towards oxygen of nGO were demonstrated on free-standing nGO films and on nGO coatings applied on a polyethylene substrate.

Effect of the oxidation degree on self-assembly, adsorption and barrier properties of nano-graphene / Castaldo, R.; Lama, G. C.; Aprea, P.; Gentile, G.; Lavorgna, M.; Ambrogi, V.; Cerruti, P.. - In: MICROPOROUS AND MESOPOROUS MATERIALS. - ISSN 1387-1811. - 260:(2018), pp. 102-115. [10.1016/j.micromeso.2017.10.026]

Effect of the oxidation degree on self-assembly, adsorption and barrier properties of nano-graphene

Aprea, P.
Data Curation
;
Ambrogi, V.
Supervision
;
2018

Abstract

Oxidized nano-graphene (nGO, lateral size about 200 nm) was synthesized from graphene nanoplatelets to evaluate the effect of sheet size and oxidation degree on self-assembly behaviour, adsorption and barrier properties of graphene. nGO samples having O/C atomic ratios between 0.11 and 0.49 were obtained. nGO water dispersions showed good stability and were effective to adsorb organic dyes. Bulk and porous self-assembled nGO samples were prepared through water evaporation and freeze-drying, respectively. For both processes, only higher oxidation degrees yielded self-standing structures. Nitrogen adsorption measurements demonstrated that self-assembly by water evaporation of highly oxidized graphene resulted in a relevant reduction of the BET specific surface area (about 2 m2/g), while freeze-drying promoted the formation of interconnected structures with higher BET specific surface area (about 120 m2/g). Barrier properties towards oxygen of nGO were demonstrated on free-standing nGO films and on nGO coatings applied on a polyethylene substrate.
2018
Effect of the oxidation degree on self-assembly, adsorption and barrier properties of nano-graphene / Castaldo, R.; Lama, G. C.; Aprea, P.; Gentile, G.; Lavorgna, M.; Ambrogi, V.; Cerruti, P.. - In: MICROPOROUS AND MESOPOROUS MATERIALS. - ISSN 1387-1811. - 260:(2018), pp. 102-115. [10.1016/j.micromeso.2017.10.026]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/693837
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