Abstract
A multi-modally interactive interface is investigated to develop a strong structural material based on hybridization of graphene oxide (GO) and tannic acid (TA) through cross-linking with coordination and covalent bonds. GO is reduced and functionalized with TA by a simple wet-chemical reaction. The resulting TA-reduced and functionalized GO (TA-RGO) sheets are macroscopically assembled into lamellar structured paper like artificial nacre by vacuum-assisted filtration. The assembled TA-RGO paper is sequentially cross-linked by Fe3+ ion and polyethyleneimine (PEI) to form a strong interface through multimodal interactions such as hydrogen bonding, covalent bonding, coordination and π-π interactions. The suspended, assembled and cross-linked TA-RGO sheets are systematically characterized by various analytical tools. By forming the multimodal interactions, the tensile strength, modulus and toughness of GO paper were enhanced from 59.5 ± 4.1 MPa, 7.8 ± 1.4 GPa, and 765 ± 112 kJ/m3 to 167.7 ± 15.4 MPa, 17.6 ± 0.4 GPa, and 1484 ± 192 kJ/m3, respectively. Based on the results, we clearly demonstrated TA can be harnessed as a multifunctional agent for reducing, functionalizing and cross-linking RGO sheets to construct a strong structural material by forming multi-modally interactive interfaces.
Original language | English |
---|---|
Article number | 108565 |
Journal | Diamond and Related Materials |
Volume | 119 |
DOIs | |
State | Published - Nov 2021 |
Keywords
- Artificial nacre
- Eco-friendly
- Graphene oxide
- Reduction
- Surface modification