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Super‐Elasticity and Ultralow Friction of Hydrogenated Fullerene‐Like Carbon Films: Associated with the Size of Graphene Sheets
Author(s) -
Cao Zhongyue,
Zhao Wenwen,
Liu Qiao,
Liang Aimin,
Zhang Junyan
Publication year - 2018
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.201701303
Subject(s) - materials science , graphene , nanostructure , composite material , nanotechnology , carbon fibers , elasticity (physics) , fullerene , composite number , chemistry , organic chemistry
Hydrogenated fullerene‐like carbon (FLC:H) films would be a widely used material with a unique combination of properties including high‐hardness/strength, excellent elasticity, and ultralow friction. The nanostructure of graphene sheets and the number of cross‐linking sites between them may be two main structural factors determining these properties. Exploring the structure–properties relationship is crucial to effectively tailor these properties for potentially more applications. In this study it is demonstrated that FLC:H films can yield exceptional and tunable mechanical properties by controlling the nanostructure of graphene sheets, similar to those of architectured materials. And the graphene sheets have a critical size (11–13 nm) endowing FLC:H films with super‐elastic recovery ability (an elastic recovery rate of 98%), ultralow friction (a friction coefficient of 0.012), and low wear (a wear rate of 10 −17 m 3 (N m) −1 ). The quadratic dependence of the energy loss factors of FLC:H films during load‐upload cycles on the size of graphene sheets are well consistent with these experimental results. This work provides a new perspective on the mechanics and friction behavior of FLC:H films and will motivate the design of more novel carbon‐based films with superelasticity and superlubricity for engineering applications.