Surface energy and wettability of van der Waals structures

Meenakshi Annamalai, Kalon Gopinadhan, Sang A. Han, Surajit Saha, Hye Jeong Park, Eun Bi Cho, Brijesh Kumar, Abhijeet Patra, Sang Woo Kim, T. Venkatesan

Research output: Contribution to journalArticlepeer-review

169 Citations (Scopus)

Abstract

The wetting behaviour of surfaces is believed to be affected by van der Waals (vdW) forces; however, there is no clear demonstration of this. With the isolation of two-dimensional vdW layered materials it is possible to test this hypothesis. In this paper, we report the wetting behaviour of vdW heterostructures which include chemical vapor deposition (CVD) grown graphene, molybdenum disulfide (MoS2) and tungsten disulfide (WS2) on few layers of hexagon boron nitride (h-BN) and SiO2/Si. Our study clearly shows that while this class of two-dimensional materials are not completely wetting transparent, there seems to be a significant amount of influence on their wetting properties by the underlying substrate due to dominant vdW forces. Contact angle measurements indicate that graphene and graphene-like layered transitional metal dichalcogenides invariably have intrinsically dispersive surfaces with a dominating London-vdW force-mediated wettability.

Original languageEnglish
Pages (from-to)5764-5770
Number of pages7
JournalNanoscale
Volume8
Issue number10
DOIs
Publication statusPublished - 2016 Mar 14

Bibliographical note

Publisher Copyright:
© 2016 The Royal Society of Chemistry.

All Science Journal Classification (ASJC) codes

  • General Materials Science

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