《Table 1 Tensile strength and elongation at break of conductive papers containing different PDA-GO c

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《Facile Fabrication of Conductive Paper-based Materials from Tunicate Cellulose Nanocrystals and Polydopamine-decorated Graphene Oxide》

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Benefiting from the multiple hydrogen bonds formed between PDA-GO and OTCNC and among OTCNCs，the cast conductive paper showed good mechanical strength.However，as a result of the rigidity of OTCNC，the extensibility of the paper was low.Table 1shows that with an increase in the content of PDA-GO，the Young’s modulus of the film first increased from3.48 GPa to 6.78 GPa，and then decreased to 4.70 GPa.This was mainly because with an increase in the PDA-GO content，the catechol group on the PDA-GO surface interacted strongly with the carboxyl and hydroxyl groups on the OTCNC surface to form hydrogen bonds.This hybrid network made the paper more flexible and rigid；however，a further increase in the PDA-GO content led to self-assembling of PDA on the PDA-GO surface，causing the PDA-GO to aggregate.Aggregation led to an uneven dispersion of PDA-GO in the OTCNC matrix.Meanwhile，the continuous network of PDA-GO partially broke the OTCNC network and decreased the rigidity of the paper.It is worth noting that the interaction between OTCNC and PDA-GO was not specific.The OTCNC network could slide on the PDA-GO surface under an external force applied to the paper，thus decreasing the rigidity and extensibility of the paper.