Liu Yang, Wang Xuzhen, Wan Wubo, Li Lingli, Dong Yanfeng, Zhao Zongbin, Qiu Jieshan
Carbon Research Laboratory, Liaoning Key Lab for Energy Materials and Chemical Engineering & School of Chemistry, State Key Lab of Fine Chemicals, Faculty of Chemical, Environmental and Biological Science and Technology, Dalian University of Technology, Dalian, 116024, China.
College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang 310032, China.
Nanoscale. 2016 Jan 28;8(4):2159-67. doi: 10.1039/c5nr05909g.
Nitrogen-doped graphene nanoribbon aerogels (N-GNRAs) are fabricated through the self-assembly of graphene oxide nanoribbons (GONRs) combined with a thermal annealing process. Amino-groups are grafted to the surface of graphene nanoribbons (GNRs) by an epoxy ring-opening reaction. High nitrogen doping level (7.6 atm% as confirmed by elemental analysis) is achieved during thermal treatment resulting from functionalization and the rich edge structures of GNRs. The three dimensional (3D) N-GNRAs feature a hierarchical porous structure. The quasi-one dimensional (1D) GNRs act as the building blocks for the construction of fishnet-like GNR sheets, which further create 3D frameworks with micrometer-scale pores. The edge effect of GNRs combined with nitrogen doping and porosity give rise to good electrical conductivity, superhydrophilic, highly compressible and low density GNRAs. As a result, a high capacity of 910 mA h g(-1) is achieved at a current density of 0.5 A g(-1) when they are tested as anode materials for lithium ion batteries. Further cell culture experiments with the GNRAs as human medulloblastoma DAOY cell scaffolds demonstrate their good biocompatibility, inferring potential applications in the biomedical field.
氮掺杂石墨烯纳米带气凝胶（N-GNRAs）是通过氧化石墨烯纳米带（GONRs）的自组装结合热退火工艺制备而成。通过环氧开环反应将氨基接枝到石墨烯纳米带（GNRs）表面。由于功能化以及GNRs丰富的边缘结构，在热处理过程中实现了高氮掺杂水平（元素分析证实为7.6原子%）。三维（3D）N-GNRAs具有分级多孔结构。准一维（1D）GNRs作为构建类似鱼网的GNR片材的基本单元，这些片材进一步形成具有微米级孔隙的3D框架。GNRs的边缘效应与氮掺杂和孔隙率相结合，产生了具有良好导电性、超亲水性、高压缩性和低密度的GNRAs。因此，当将它们作为锂离子电池的负极材料进行测试时，在0.5 A g(-1)的电流密度下实现了910 mA h g(-1)的高容量。进一步以GNRAs作为人髓母细胞瘤DAOY细胞支架的细胞培养实验证明了它们良好的生物相容性，推断其在生物医学领域具有潜在应用。
