WCU Programme, Department of BIN Fusion Technology, Chonbuk National University, Jeonju, Jeonbuk, 561-756, Republic of Korea.
Langmuir. 2012 Jun 26;28(25):9825-33. doi: 10.1021/la301469u. Epub 2012 Jun 12.
A simple and effective method for the preparation of water dispersible graphene using sulfonated poly(ether-ether-ketone) (SPEEK) has been described. The SPEEK macromolecules are noncovalently adsorbed on the surface of graphene through π-π interactions. The SPEEK-modified graphene (SPG) forms an aqueous dispersion that is stable for more than six months. An analysis of the ultraviolet-visible spectra shows that the aqueous dispersion of SPG obeys Beer's law and the molar extinction coefficient has been found to be 149.03 mL mg(-1) cm(-1). Fourier transform infrared, Raman, and X-ray photoelectron spectroscopy analyses confirm successful reduction and surface modification of graphene. An atomic force microscopy (AFM) analysis reveals the formation of a single layer of functionalized graphene. Transmission electron microscopy results are also in good agreement with the AFM analysis and support the formation of single-layer graphene. SPG shows good electrochemical cyclic stability during cyclic voltammetry and charge/discharge process when used as a supercapacitor electrode. A specific capacitance of 476 F g(-1) at a current density of 6.6 A g(-1) is observed for SPG materials.
已经描述了一种使用磺化聚醚醚酮（SPEEK）制备水分散石墨烯的简单有效方法。SPEEK 大分子通过π-π 相互作用非共价吸附在石墨烯表面。SPEEK 改性石墨烯（SPG）形成了一种稳定超过六个月的水基分散体。紫外-可见光谱分析表明，SPG 的水基分散体遵守比尔定律，并且已经发现摩尔消光系数为 149.03 mL mg(-1) cm(-1)。傅里叶变换红外、拉曼和 X 射线光电子能谱分析证实了石墨烯的成功还原和表面改性。原子力显微镜（AFM）分析表明形成了单层功能化石墨烯。透射电子显微镜结果也与 AFM 分析吻合良好，支持单层石墨烯的形成。SPG 在用作超级电容器电极时，在循环伏安法和充放电过程中表现出良好的电化学循环稳定性。在电流密度为 6.6 A g(-1) 时，SPG 材料的比电容为 476 F g(-1)。
