Green chemistry: Co-assembly of tannin-assisted exfoliated low-defect graphene and epoxy natural rubber latex to form soft and elastic nacre-like film with good electrical conductivity

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• 作者：Zhaori Yu^a ; Zixing Shi^a ; ^{zxshi@sjtu.edu.cn} ; Hongjie Xu^a ; Xiaodong Ma^a ; Ming Tian^b ; ^{tianm@mail.buct.edu.cn} ; Jie Yin^a
• 刊名：Carbon
• 出版年：2017
• 出版时间：April 2017
• 年：2017
• 卷：114
• 期：Complete
• 页码：649-660
• 全文大小：3385 K
• 卷排序：114

文摘

In this paper, we successfully prepared low-defect exfoliated graphene-based soft nacre-like composite film with superb elasticity and electrical conductivities, which is quite different from the conventional graphene oxide based film. Herein, we demonstrate a large-scale exfoliation process of graphite by incorporation of Myrtan Condensed Tannins (MCT), a natural polyphenol product extracted from bark of Arbutus. MCT could successfully produce large quantities of exfoliated graphene suspension (2.33 mg mL−1) with very few defects (ID/IG ∼ 0.27) in water, where more than 68% of these flakes are monolayer. Furthermore, via vacuum-assisted layer-by-layer self-assembled method, the soft and elastic exfoliated graphene-based nacre-like composite film was prepared using epoxy natural rubber (ENR) latex as crosslinking agent. Flexibility and stability of this graphene-based electrical conductive film are greatly enhanced at the same time. The composite films could be stretched by 20% of its initial length with 54 wt % of ENR in it and it could also be directly used as a conductive wire for an LED lamp with a conductivity of 157 S m−1. Most importantly, most of the raw materials used in this work are low cost natural products which is environmental-friendly and also suitable for production in large quantities.