TY - JOUR
T1 - Ultralight Graphene Foam/Conductive Polymer Composites for Exceptional Electromagnetic Interference Shielding
AU - Wu, Ying
AU - Wang, Zhenyu
AU - Liu, Xu
AU - Shen, Xi
AU - Zheng, Qingbin
AU - Xue, Quan
AU - Kim, Jang Kyo
N1 - Funding Information:
This project was financially supported by the Research Grants Council of Hong Kong SAR (GRF Projects: 16203415 and 16229216). Y.W. and X.L. were supported by the Postgraduate Scholarship of HKUST. Z.W. and X.S. were recipients of the Hong Kong Ph.D. Fellowship. Technical assistance from the Materials Characterization and Preparation Facilities (MCPF) and the Advanced Engineering Material Facility (AEMF) at HKUST is also appreciated.
Publisher Copyright:
© 2017 American Chemical Society.
PY - 2017/3/15
Y1 - 2017/3/15
N2 - Ultralight, high-performance electromagnetic interference (EMI) shielding graphene foam (GF)/poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) composites are developed by drop coating of PEDOT:PSS on cellular-structured, freestanding GFs. To enhance the wettability and the interfacial bonds with PEDOT:PSS, GFs are functionalized with 4-dodecylbenzenesulfonic acid. The GF/PEDOT:PSS composites possess an ultralow density of 18.2 × 10-3 g/cm3 and a high porosity of 98.8%, as well as an enhanced electrical conductivity by almost 4 folds from 11.8 to 43.2 S/cm after the incorporation of the conductive PEDOT:PSS. Benefiting from the excellent electrical conductivity, ultralight porous structure, and effective charge delocalization, the composites deliver remarkable EMI shielding performance with a shielding effectiveness (SE) of 91.9 dB and a specific SE (SSE) of 3124 dB·cm3/g, both of which are the highest among those reported in the literature for carbon-based polymer composites. The excellent electrical conductivities of composites arising from both the GFs with three-dimensionally interconnected conductive networks and the conductive polymer coating, as well as the left-handed composites with absolute permittivity and/or permeability larger than one give rise to significant microwave attenuation by absorption.
AB - Ultralight, high-performance electromagnetic interference (EMI) shielding graphene foam (GF)/poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) composites are developed by drop coating of PEDOT:PSS on cellular-structured, freestanding GFs. To enhance the wettability and the interfacial bonds with PEDOT:PSS, GFs are functionalized with 4-dodecylbenzenesulfonic acid. The GF/PEDOT:PSS composites possess an ultralow density of 18.2 × 10-3 g/cm3 and a high porosity of 98.8%, as well as an enhanced electrical conductivity by almost 4 folds from 11.8 to 43.2 S/cm after the incorporation of the conductive PEDOT:PSS. Benefiting from the excellent electrical conductivity, ultralight porous structure, and effective charge delocalization, the composites deliver remarkable EMI shielding performance with a shielding effectiveness (SE) of 91.9 dB and a specific SE (SSE) of 3124 dB·cm3/g, both of which are the highest among those reported in the literature for carbon-based polymer composites. The excellent electrical conductivities of composites arising from both the GFs with three-dimensionally interconnected conductive networks and the conductive polymer coating, as well as the left-handed composites with absolute permittivity and/or permeability larger than one give rise to significant microwave attenuation by absorption.
KW - EMI shielding
KW - graphene foam composites
KW - negative permittivity
KW - noncovalent functionalization
KW - ultralightweight
UR - http://www.scopus.com/inward/record.url?scp=85015419680&partnerID=8YFLogxK
U2 - 10.1021/acsami.7b01017
DO - 10.1021/acsami.7b01017
M3 - Journal article
C2 - 28224798
AN - SCOPUS:85015419680
SN - 1944-8244
VL - 9
SP - 9059
EP - 9069
JO - ACS Applied Materials and Interfaces
JF - ACS Applied Materials and Interfaces
IS - 10
ER -