Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 29, Pages 24987-24992Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b07748
Keywords
bioinspired; conductive; robust; pi-conjugated; graphene films
Funding
- Excellent Young Scientist Foundation of NSFC [51522301]
- National Natural Science Foundation of China [21273017, 51103004]
- Program for New Century Excellent Talents in University [NCET-12-0034]
- Fok Ying-Tong Education Foundation [141045]
- 111 Project [B14009]
- Aeronautical Science Foundation of China [20145251035, 2015ZF21009]
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology [oic-201701007]
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University [LK1508]
- Fundamental Research Funds for the Central Universities [YWF-16-BJ-J-09, YWF-17-BJ-J-33]
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Graphene composite films inspired by nacre are the subject of ongoing research efforts to optimize their properties for applications in flexible energy devices. Noncovalent interactions do not cause interruption of the delocalized conjugated pi-electron system, thus preserving graphene's excellent properties. Herein, we synthesized a conjugated molecule with pyrene groups on both ends of a long linear chain (AP-DSS) from 1-aminopyrene (AP) and disuccinimidyl suberate (DSS). The AP-DSS molecules are used to cross-link adjacent graphene nanosheets via pi-pi interfacial interactions to improve properties of graphene films. The tensile strength and toughness of resultant graphene films were 4.1 and 6.4 times higher, respectively, than that of pure rGO film. More remarkably, the electrical conductivity showed a simultaneous improvement, which is rare to be achieved in other kinds of covalent or noncovalent functionalization. Such integration demonstrates the advantage of this work to previously reported noncovalent functionalization of graphene.
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