WETTABILITY OF LANGMUIR-BLODGETT FILMS FROM SIZE- SELECTED LIQUID PHASE EXFOLIATED GRAPHENE FLAKES

17th International Conference on Fundamental and Applied Aspects of Physical Chemistry (Proceedings, Volume I) (2024) [H-26-P, pp. 377-380]  

AUTHOR(S) / AUTOR(I): Barbara Bekić , Jasmina Lazarević , Marko Spasenović  and Tijana Tomašević-Ilić

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DOI: 10.46793/Phys.Chem24I.377B

ABSTRACT / SAŽETAK:

We investigated the wettability of Langmuir-Blodgett films from liquid phase exfoliated graphene. By applying cascade centrifugation, dispersions with size-selected flakes are obtained, and depending on the selected dispersion for film formation, films with different defect density are produced. We determined the wettability of our films by measuring the contact angle (CA). Films with the highest defect density, produced by the self-organization of smaller-sized and thinner graphene flakes, exhibited the highest wettability, with a CA of 77°. Conversely, films produced from dispersions with larger nanosheet dimensions demonstrated a hydrophobic nature, with a CA of 90°. This suggests that the wettability of our films can be adjusted by varying the size of the nanosheets used for film formation. Controlling the defect density and wettability of self-assembled graphene films allows the optimization of their properties for various application, particularly in wearable electronics.

KEYWORDS / KLJUČNE REČI:

ACKNOWLEDGEMENT / PROJEKAT:

This work was supported by the Institute of Physics Belgrade through the Grant by the Ministry of Science, Technological Development and Innovations. M. S. acknowledges the Ministry of Science, Technological Development, and Innovation of Republic of Serbia (Contract No: 451-03-66/2024- 03/200026).

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