journal article·2020-07-28

Impact of Grain Boundaries on the Elastic Behavior of Transferred Polycrystalline Graphene

Ji Won Suk, Yufeng Hao, Kenneth M. Liechti, Rodney S. Ruoff

Chemistry of Materials· Volume 32· Issue 14
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Abstract

The mechanical properties of nanomaterials can be strongly affected by their crystal structures and defect configurations. Here, the in-plane stiffness of polycrystalline graphene obtained by chemical vapor deposition (CVD) has been investigated by using bulge tests on suspended graphene membranes. In particular, the influence of grain boundaries (GBs) on the in-plane stiffness of graphene membranes was studied by controlling the density of GBs within graphene membranes. The GBs were visualized by sequential growth of 13C- and 12C-graphene along with detection of Raman peak shifts for 13C and 12C in graphene, which enabled the nondestructive evaluation of the GB density (defined as the ratio of the total GB length within a graphene membrane to the diameter of the membrane). Single-crystal graphene membranes without any GBs had an average Young’s modulus of 0.95 ± 0.12 TPa (corresponding to an average in-plane stiffness of 318 ± 40 N/m), comparable to that obtained from mechanically exfoliated graphene. An increased GB density within the membranes softened the graphene membranes, resulting in a lower in-plane stiffness. This phenomenon was most clearly observed when the lateral sizes of grains (<∼2 μm) were much smaller than the membrane diameter (8–9 μm).
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Research context

OpenAlex topics: Graphene research and applications · Graphene and Nanomaterials Applications · Carbon Nanotubes in Composites

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Mechanical Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do 16419, Republic of Korea

SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon, Gyeonggi-do 16419, Republic of Korea

Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States

National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Collaborative Innovation Center of Advanced Microstructures, and Jiangsu Key Laboratory of Artificial Functional Materials, Nanjing University, Nanjing 210093, China

Haian Institute of New Technology, Nanjing University, Haian 226600, China

School of Physics and Microelectronics, Zhengzhou University, Zhengzhou, Henan 450001, China

Department of Aerospace Engineering and Engineering Mechanics, The University of Texas at Austin, Austin, Texas 78712, United States

Center for Multidimensional Carbon Materials (CMCM), Institute for Basic Science (IBS), Ulsan 689-798, Republic of Korea

Funding

Ministry of Science and Technology of the People's Republic of China · National Research Foundation of Korea · Division of Civil, Mechanical and Manufacturing Innovation · National Natural Science Foundation of China · Distinguished Young Scholars Fund of Jiangsu Province · JiangHai Talent program of Nantong

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