Strain Engineering in Highly Wrinkled CVD Graphene/Epoxy Systems
Journal article, 2018
Chemical vapor deposition (CVD) is regarded as a promising fabrication method for the automated, large-scale, production of graphene and other two-dimensional materials. However, its full commercial exploitation is limited by the presence of structural imperfections such as folds, wrinkles, and even cracks that downgrade its physical and mechanical properties. For example, as shown here by means of Raman spectroscopy, the stress transfer from an epoxy matrix to CVD graphene is on average 30% of that of exfoliated monolayer graphene of over 10 μm in dimensions. However, in terms of electrical response, the situation is reversed; the resistance has been found here to decrease by the imposition of mechanical deformation possibly due to the opening up of the structure and the associated increase of electron mobility. This finding paves the way for employing CVD graphene/epoxy composites or coatings as conductive "networks" or bridges in cases for which the conductivity needs to be increased or at least retained when the system is under deformation. The tuning/control of such systems and their operative limitations are discussed here.
Raman spectroscopy
electrical resistance
epoxy resin
wrinkles
CVD graphene
Author
George Anagnostopoulos
Institute of Chemical Engineering and High Temperature Chemical Processes
George Paterakis
Institute of Chemical Engineering and High Temperature Chemical Processes
Ioannis Polyzos
Institute of Chemical Engineering and High Temperature Chemical Processes
Panagiotis Nektarios Pappas
Institute of Chemical Engineering and High Temperature Chemical Processes
Kostantinos Kouroupis-Agalou
National Research Council of Italy (CNR)
Nicola Mirotta
National Research Council of Italy (CNR)
A. Scidà
National Research Council of Italy (CNR)
Vincenzo Palermo
Chalmers, Industrial and Materials Science, Materials and manufacture
National Research Council of Italy (CNR)
John Parthenios
Institute of Chemical Engineering and High Temperature Chemical Processes
Konstantinos Papagelis
Aristotle University of Thessaloniki
Institute of Chemical Engineering and High Temperature Chemical Processes
C. Galiotis
Institute of Chemical Engineering and High Temperature Chemical Processes
Universityof Patras
ACS Applied Materials & Interfaces
1944-8244 (ISSN) 1944-8252 (eISSN)
Vol. 10 49 43192-43202Subject Categories (SSIF 2011)
Textile, Rubber and Polymeric Materials
Other Materials Engineering
Composite Science and Engineering
DOI
10.1021/acsami.8b14698