Charalampos Androulidakisa, Emmanuel N. Koukarasa,b, Krishna Sampathkumarc,d, Jaroslava Rahovac,e, Costas Galiotisa,f, Otakar Frankc
a Institute of Chemical Engineering Sciences, Foundation of Research and Technology-Hellas (FORTH/ICE-HT), Stadiou Street, Platani, Patras, 26504, Greece
b Laboratory of Quantum and Computational Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, GR-54124 Thessaloniki, Greece
c J.Heyrovsky Institute of Physical Chemistry of the CAS, v.v.i., Dolejskova 2155/3, 182 23 Prague 8, Czech Republic
d Central European Institute of Technology (CEITEC), Brno University of Technology, Purkynova 123, 612 00 Brno, Czech Republic
e Department of Inorganic Chemistry, Faculty of Science, Charles University in Prague, Albertov 6, 128 43 Prague 2, Czech Republic
f Department of Chemical Engineering, University of Patras, Patras 26504, Greece
DOI: 10.1016/j.eml.2020.100948
ABSTRACT
Wrinklons, the transition zone where two wrinkles are merged to one, have been observed in various thin films across all scales. For suspended films the evolution of the wrinklon wavelength from the edge can be described by λ ∼ xm, where m is universal. Herein we show experimentally that for graphene wrinklons on a compliant polymer, m is not universal, but varies with the graphene thickness. An analytical model is developed based on energy principles, which shows that the influence of the substrate has to be taken into account. The present analysis can be applied further in all thin films on substrate and provides significant physical insight for the wrinklon phenomenology.
