Nanoscale mechanics of metal-coated graphene nanocomposite powders

Chen, Wenge, Yang, Yixiao, Zhao, Qian, Liu, Xiaoteng and Fu, Yong Qing (2022) Nanoscale mechanics of metal-coated graphene nanocomposite powders. Materials Today Communications, 33. p. 104731. ISSN 2352-4928

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Nanoscale mechanical properties of graphene and metal-coated graphene nanocomposite powders were evaluated using a nano-indentation method with an atomic force microscope. The obtained results were then verified using the data obtained from the first principle calculations. Graphene synthesized using the modified Hummer method showed a layered structure with a thickness of ∼ 1.1 nm. Metal coated graphene nanocomposite powders, including copper-coated graphene ones (Cu@graphene) and nickel-coated graphene ones (Ni@graphene), were synthesized using an in-situ co-reduction method. The obtained average values of Young's moduli of graphene, Cu@graphene and Ni@graphene from the nano-indentation tests were 0.98 TPa, 1.03 TPa and 1.06 TPa, and their moduli obtained using the first principle calculations were 1.051 TPa, 1.07 TPa, and 1.10 TPa, respectively. The calculated binding energy values between metal and graphene were − 1.54 eV for Cu@graphene and − 3.85 eV for Ni@graphene. Significant charge transfers between carbon atoms and metal atoms were found to apparently enhance the bond strengths of both Csingle bondC and metallic bonds.

Item Type: Article
Additional Information: Funding information: The authors would like to acknowledge the financial supports from Key Research and Development Projects of Shaanxi Province (No. 2020ZDLGY12-06), Xi’an Science Research Project of China (No. 2021XJZZ0042) and International Exchange Grant (IEC/NSFC/201078) through Royal Society and National Science Foundation of China (NSFC).
Uncontrolled Keywords: First-principles calculation, Graphene, Mechanical properties, Metal@graphene, Nano-indentation
Subjects: F200 Materials Science
H300 Mechanical Engineering
J500 Materials Technology not otherwise specified
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Elena Carlaw
Date Deposited: 16 Dec 2022 11:09
Last Modified: 16 Dec 2022 11:15

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