Exploring the mechanical properties of nanometer-thick elastic films through micro-drop impinging on large-area suspended graphene

Yu Tzu Liao, Shiuan Ying Peng, Kai Wen Chuang, Ying Chih Liao, Yasuhiro Kuramitsu, Wei Yen Woon

Research output: Contribution to journalArticlepeer-review

Abstract

In this work, the dependence of effective Young's modulus on the thickness of suspended graphene was confirmed through a drop impingement method. Large area suspended graphene (LSG) layers with a diameter of up to 400 μm and a nanometer thickness were prepared through transferring chemical vapor deposition grown graphene from copper substrates. 4, 8, and 12-layer LSG samples were found to be crumpled yet defect-free. The mechanical properties of LSG were first studied by observing its interaction with impinging droplets from an ink-jet nozzle. First, the effective Young's modulus was calculated by fitting the instant deformation captured by high speed photography within microseconds. Next, droplets deposited on LSG caused deformation and generated wrinkles and the effective Young's modulus was calculated from the number of wrinkles. The above methods yielded effective Young's modulus values ranging from 0.3 to 3.4 TPa. The results from these methods all indicated that the effective Young's modulus increases with the decreasing thickness or size of suspended graphene layers. Moreover, the crumpled LSG yields higher effective Young's modulus than ideal flat graphene. These comprehensive results from complementary methodologies with precise LSG thickness control down to the nanometer scale provide good evidence to resolve the debate on the thickness dependence of mechanical strength for LSG.

Original languageEnglish
Pages (from-to)42-48
Number of pages7
JournalNanoscale
Volume14
Issue number1
DOIs
StatePublished - 7 Jan 2022

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