Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.11851/3912
Title: Wrinkling of graphene because of the thermal expansion mismatch between graphene and copper
Authors: Oğurtani, Ömer Tarık
Şenyıldız, Doğukan
Büke, Zarife Göknur
Keywords: Atomic force microscopy
copper
graphene
strain
thermal stresses
wrinkling
Issue Date: May-2018
Publisher: WILEY
Source: Ogurtani, O. T., Senyildiz, D., Cambaz Buke, G. (2018). Wrinkling of graphene because of the thermal expansion mismatch between graphene and copper. Surface and Interface Analysis, 50(5), 547-551.
Abstract: Well-defined bundles of wrinkles are observed on the graphene-covered copper by using atomic force microscopy after chemical vapor deposition process. Their numerical analyses are performed by employing a set of formula deduced from classical elasticity theory of bent thin films with clamped boundary conditions. Here they are imposed by the banks of trenches associated with the reconstructed copper substrate surfaces, which suppress lateral movements of graphene monolayers and induce local biaxial stress. The wrinkling wavelength (lambda) and amplitude (A) are both measured experimentally (lambda = 100-160 nm and A = 2.5-3 nm) and calculated numerically (lambda = 167 nm and A = 3.0 nm) and found to be in good agreement. Wrinkle formation is attributed to the nonhydrostatic compression stresses induced on the graphene by the linear thermal expansion coefficient difference between graphene and copper during cooling. These mismatch stresses, which are varying strongly with the temperature, create temperature-dependent wrinkling wave formation that decreases in wavelength and increases in amplitude upon cooling below the crossover temperature of 1233 K, at which both values of linear thermal expansion coefficient are equal.
URI: https://hdl.handle.net/20.500.11851/3912
https://onlinelibrary.wiley.com/doi/full/10.1002/sia.6423
ISSN: 1096-9918
0142-2421
Appears in Collections:Malzeme Bilimi ve Nanoteknoloji Mühendisliği Bölümü / Department of Material Science & Nanotechnology Engineering
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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