Reduction dependent wetting properties of graphene oxide
Reduction dependent wetting properties of graphene oxide
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DOI：
10.1016/j.carbon.2014.05.052
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发表时间：
2014-10-01
期刊：
影响因子：
10.9
通讯作者：
Ottaviano, Luca
中科院分区：
文献类型：
--
作者：
Perrozzi, Francesco;Croce, Salvatore;Ottaviano, Luca
本研究报告了在高达900摄氏度的超高真空中热还原的氧化石墨烯薄膜上的标准，二醇和芳香族溶剂的接触角测量。薄膜的化学和形态特征，分别使用X射线光电子能谱和原子力显微镜。表征结果表明，润湿发生在化学非均匀制度，即表面粗糙度（3 nm）不影响样品的润湿性能。Zisman，Owens-Wendt和Neumann方法已被应用，以计算薄膜的表面自由能，表明Owens-Wendt方法最适合的数据趋势。表面自由能从51 mN/m（原始氧化石墨烯）变化到39 mN/m（900 ℃还原的氧化石墨烯）。的表面化学组成，表面自由能和它的极性和色散分量之间的相关性的报告，给出了一个基本原理的氧化石墨烯和还原氧化石墨烯的润湿性能。(C)2014爱思唯尔有限公司版权所有。
This study reports contact angle measurements of standard, diol and aromatic solvents on graphene oxide thin films thermally reduced in ultra-high vacuum up to 900 degrees C. The films were chemically and morphologically characterized using respectively X-ray photoemission spectroscopy and atomic force microscopy. The characterization shows that the wetting occurs in the chemically heterogeneous regime, namely the surface roughness (3 nm) does not influence the wetting properties of the samples. Zisman, Owens-Wendt and Neumann methods have been applied in order to calculate the surface free energy of the thin films showing that the Owens-Wendt method best fit the data trends. The surface free energy varies from 51 mN/m (pristine graphene oxide) to 39 mN/m (900 degrees C reduced graphene oxide). A correlation between the surface chemical composition, the surface free energy and its polar and dispersive components is reported, giving a rationale to the wetting properties of graphene oxide and reduced graphene oxide. (C) 2014 Elsevier Ltd. All rights reserved.