Sun Hong-Juan, Liu Bo, Peng Tong-Jiang, Zhao Xiao-Long
Key Laboratory of Ministry of Education for Solid Waste Treatment and Resource Recycle, Southwest University of Science and Technology, Mianyang 621010, China.
School of National Defense Science and Technology, Southwest University of Science and Technology, Mianyang 621010, China.
Materials (Basel). 2018 Apr 23;11(4):647. doi: 10.3390/ma11040647.
In this study, graphene oxides with different functionalization degrees were prepared by a facile one-step hydrothermal reflux method at various reaction temperatures using graphene oxide (GO) as starting material and -phenylenediamine (PPD) as the modifier. The effects of reaction temperature on structure, appearance and bonding type of the obtained materials were investigated by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). The results showed that when the reaction temperature was 10⁻70 °C, the GO reacted with PPD through non-covalent ionic bonds (⁻COOH₃⁺N⁻R) and hydrogen bonds (C⁻OH…H₂N⁻X). When the reaction temperature reached 90 °C, the GO was functionalized with PPD through covalent bonds of C⁻N. The crystal structure of products became more ordered and regular, and the interlayer spacing ( value) and surface roughness increased as the temperature increased. Furthermore, the results suggested that PPD was grafted on the surface of GO through covalent bonding by first attacking the carboxyl groups and then the epoxy groups of GO.
在本研究中，以氧化石墨烯（GO）为原料、对苯二胺（PPD）为改性剂，通过简便的一步水热回流法在不同反应温度下制备了具有不同功能化程度的氧化石墨烯。采用X射线衍射（XRD）、傅里叶变换红外光谱（FT-IR）、X射线光电子能谱（XPS）和扫描电子显微镜（SEM）研究了反应温度对所得材料的结构、外观和键合类型的影响。结果表明，当反应温度为10⁻70℃时，GO与PPD通过非共价离子键（⁻COOH₃⁺N⁻R）和氢键（C⁻OH…H₂N⁻X）发生反应。当反应温度达到90℃时,GO通过C⁻N共价键与PPD发生功能化反应。产物的晶体结构变得更加有序和规则，并且层间距（ 值）和表面粗糙度随温度升高而增大。此外，结果表明PPD首先攻击GO的羧基，然后攻击GO的环氧基，通过共价键接枝在GO表面。
