https://scholars.lib.ntu.edu.tw/handle/123456789/598281
標題: | Exploring the mechanical properties of nanometer-thick elastic films through micro-drop impinging on large-area suspended graphene | 作者: | Liao Y.-T Peng S.-Y Chuang K.-W Liao Y.-C Kuramitsu Y Woon W.-Y. YING-CHIH LIAO |
關鍵字: | Chemical vapor deposition;Deformation;Elastic moduli;Graphene;High speed photography;Chemical vapour deposition;Copper substrates;Defect-free;Effective young's modulus;Elastic films;Graphene layers;Highspeed photography;Microdrops;Nanometer thickness;Suspended graphene;Drops | 公開日期: | 2022 | 卷: | 14 | 期: | 1 | 起(迄)頁: | 42-48 | 來源出版物: | Nanoscale | 摘要: | 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. ? The Royal Society of Chemistry. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85122157778&doi=10.1039%2fd1nr05918a&partnerID=40&md5=190e36b08058f411e59f3f1f56e81723 https://scholars.lib.ntu.edu.tw/handle/123456789/598281 |
ISSN: | 20403364 | DOI: | 10.1039/d1nr05918a |
顯示於: | 化學工程學系 |
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