State Key Laboratory of Bioelectronics, Southeast University, Nanjing 210096, China.
ACS Appl Mater Interfaces. 2013 Feb;5(4):1489-93. doi: 10.1021/am303010j. Epub 2013 Feb 11.
It is a great challenge to directly assemble two-dimensional (2D) graphene oxide (GO) sheets into 1D fibers without any polymer or surfactant for their promising multifunctional applications. Herein, a facile self-assembly strategy is proposed to fabricate neat GO fibers from cost-efficient, aqueous GO suspension at a liquid/air interface based on the repulsive electrostatic forces, attractive van der Waals forces, and π-π stacking. During the self-assembly process and ultrasonic cleaning, the morphology variated from the source graphite powder through GO sheets to GO fibers and finally to neat GO fiber films. It is interesting to note that the electrical property of the GO fiber films was improved dramatically after subsequent low-temperature thermal annealing. The morphological evolution process and formation mechanism were analyzed on the basis of optical microscopy, scanning electron microscopy, and transmission electron microscopy observation, and the electrical characteristics was also discussion.
将二维（2D）氧化石墨烯（GO）片直接组装成 1D 纤维而不使用任何聚合物或表面活性剂对于其有前途的多功能应用来说是一个巨大的挑战。在此，提出了一种简便的自组装策略，通过基于排斥静电、吸引力范德华力和π-π 堆积的液/气界面，从成本效益高的水性 GO 悬浮液中制造出纯净的 GO 纤维。在自组装过程和超声清洗过程中，形态从源石墨粉通过 GO 片到 GO 纤维，最后到纯净的 GO 纤维膜发生变化。有趣的是，注意到在随后的低温热退火后，GO 纤维膜的电性能得到了显著提高。基于光学显微镜、扫描电子显微镜和透射电子显微镜观察分析了形态演变过程和形成机制，并讨论了其电特性。
