Anomalous elasticity and damping in covalently cross-linked graphene aerogels

0553419 - FZÚ 2023 RIV GB eng J - Journal Article
Šilhavík, Martin - Kumar, Prabhat - Zafar, Zahid Ali - Míšek, Martin - Čičala, Martin - Piliarik, Marek - Červenka, Jiří
Anomalous elasticity and damping in covalently cross-linked graphene aerogels.
COMMUNICATIONS PHYSICS. Roč. 5, č. 1 (2022), č. článku 27. ISSN 2399-3650. E-ISSN 2399-3650
R&D Projects: GA MŠMT EF16_026/0008382; GA ČR GA19-23986S; GA MŠMT(CZ) LM2018096; GA MŠMT(CZ) LL1602
Grant - others:OP VVV - CARAT CZ.02.1.01/0.0/0.0/16_026/0008382
Institutional support: RVO:68378271 ; RVO:67985882
Keywords : graphene aerogels * superelasticity * damping
OECD category: Condensed matter physics (including formerly solid state physics, supercond.); Optics (including laser optics and quantum optics) (URE-Y)
Impact factor: 5.5, year: 2022
Method of publishing: Open access

Elasticity in materials is a phenomenon that provides a basis for widespread practical applications in engineering, medicine, and electronics. Most of the conventional materials can withstand only small deformations within the elastic limit, typically below 5% of their original size. Here, we report a graphene aerogel made of covalently cross-linked graphene sheets that exhibits anomalous superelastic behavior up to 92% of compressive and 68% tensile strain. We show that the graphene aerogel has a nonlinear stress-strain characteristic with the compressive and tensile yield strength of 4.5 GPa and 0.6 MPa, respectively. By considering the elastic bending of graphene sheets and buckle folding of pore walls, we develop a quantitative origami model that describes the stress-strain behavior of the aerogel. In addition, we analyze the mechanical oscillations of the graphene aerogel, observing superfast vibration damping within a time scale of 50–250 ns.
Permanent Link: http://hdl.handle.net/11104/0330530