title: Comparative fracture toughness of multilayer graphenes and boronitrenes.
abstract: We report the comparative in situ fracture toughness testing on single-edge V/U-notched multilayer graphenes and boronitrenes in a high-resolution transmission electron microscope (HRTEM). The nanostructures of notch tips and fracture edges of the tested specimens are unambiguously resolved using HRTEM. By analyzing the notch tip stresses using finite element method, the fracture toughness of multilayer graphenes and boronitrenes is determined to be 12.0 ± 3.9 and 5.5 ± 0.7 MPa√m, respectively, taking into account the notch tip blunting effects.
authors.affiliation: Key Laboratory for the Physics and Chemistry of Nanodevices, Department of Electronics, Peking University , Beijing 100871, P. R. China.
authors.forename: Xianlong
authors.initials: X
authors.lastname: Wei
authors.forename: Si
authors.initials: S
authors.lastname: Xiao
authors.forename: Faxin
authors.initials: F
authors.lastname: Li
authors.forename: Dai-Ming
authors.initials: DM
authors.lastname: Tang
authors.forename: Qing
authors.initials: Q
authors.lastname: Chen
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Bando
authors.forename: Dmitri
authors.initials: D
authors.lastname: Golberg
keywords: Graphene; boronitrene; fracture toughness; transmission electron microscope; two-dimensional nanosheets