TY - JOUR
T1 - Planar Porous Graphene Woven Fabric/Epoxy Composites with Exceptional Electrical, Mechanical Properties, and Fracture Toughness
AU - Liu, Xu
AU - Sun, Xinying
AU - Wang, Zhenyu
AU - Shen, Xi
AU - Wu, Ying
AU - Kim, Jang Kyo
N1 - Publisher Copyright:
© 2015 American Chemical Society.
PY - 2015/9/30
Y1 - 2015/9/30
N2 - Planar interconnected graphene woven fabrics (GWFs) are prepared by template-based chemical vapor deposition and the GWFs are employed as multifunctional filler for epoxy-based composites. Apart from flexibility, transparency, lightweight, and high electrical conductivity, the GWFs have unique morphological features consisting of orthogonally interweaved, inherently percolated, hollow graphene tubes (GTs). The orthogonal GT structure means that the GWF/epoxy composites hold significant anisotropy in mechanical and fracture properties. The composites with 0.62 wt % graphene deliver a combination of excellent electrical and fracture properties: e.g., an electrical conductivity of 0.18 S/cm; and fracture toughness of 1.67 and 1.78 MPa·m1/2 when loaded along the 0° and 45° directions relative to the GT direction, respectively, equivalent to notable 57% and 67% rises compared to the solid epoxy. Unique fracture processes in GWF/epoxy composites are identified by in situ examinations, revealing crack tip blunting that occurs when the crack impinges GTs, especially those at 45° to the crack growth direction, as well as longitudinal tearing of hollow GTs as the two major toughening mechanisms.
AB - Planar interconnected graphene woven fabrics (GWFs) are prepared by template-based chemical vapor deposition and the GWFs are employed as multifunctional filler for epoxy-based composites. Apart from flexibility, transparency, lightweight, and high electrical conductivity, the GWFs have unique morphological features consisting of orthogonally interweaved, inherently percolated, hollow graphene tubes (GTs). The orthogonal GT structure means that the GWF/epoxy composites hold significant anisotropy in mechanical and fracture properties. The composites with 0.62 wt % graphene deliver a combination of excellent electrical and fracture properties: e.g., an electrical conductivity of 0.18 S/cm; and fracture toughness of 1.67 and 1.78 MPa·m1/2 when loaded along the 0° and 45° directions relative to the GT direction, respectively, equivalent to notable 57% and 67% rises compared to the solid epoxy. Unique fracture processes in GWF/epoxy composites are identified by in situ examinations, revealing crack tip blunting that occurs when the crack impinges GTs, especially those at 45° to the crack growth direction, as well as longitudinal tearing of hollow GTs as the two major toughening mechanisms.
KW - anisotropic properties
KW - fracture toughness
KW - graphene woven fabric
KW - orthogonal graphene tubes
KW - porous structure
UR - http://www.scopus.com/inward/record.url?scp=84942887077&partnerID=8YFLogxK
U2 - 10.1021/acsami.5b06476
DO - 10.1021/acsami.5b06476
M3 - Article
AN - SCOPUS:84942887077
SN - 1944-8244
VL - 7
SP - 21455
EP - 21464
JO - ACS Applied Materials and Interfaces
JF - ACS Applied Materials and Interfaces
IS - 38
ER -