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 π-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 π-π 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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Article Synopsis
- Transition metal oxides, like MnO, show great promise as anodes for flexible electrodes but face challenges such as low conductivity and poor cycling performance.
- A new method called "spontaneous complexation and exfoliation" creates flexible thin-film electrodes using MnO nanocrystals and reduced graphene oxide (rGO), improving their mechanical flexibility and lithium-ion storage capacity.
- The resulting flexible anodes deliver around 1220 mAh/g over 1000 cycles with high-rate capacity, while maintaining performance even under bending, highlighting their potential for advanced energy storage solutions.
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