Departamento de Química Física, Facultad de Ciencias Químicas, Universidad de Salamanca, Spain.
Chemphyschem. 2012 Nov 12;13(16):3682-90. doi: 10.1002/cphc.201200501. Epub 2012 Aug 13.
Films of a few layers in thickness of reduced graphite oxide (RGO) sheets functionalized by the zwitterionic surfactant N-dodecyl-N,N-dimethyl-3-ammonio-1-propanesulfonate (DDPS) are obtained by using the Langmuir-Blodgett method. The quality of the RGO sheets is checked by analyzing the degrees of reduction and defect repair by means of X-ray photoelectron spectroscopy, atomic force microscopy (AFM), field-emission scanning electron microscopy (SEM), micro-Raman spectroscopy, and electrical conductivity measurements. A modified Hummers method is used to obtain highly oxidized graphite oxide (GO) together with a centrifugation-based method to improve the quality of GO. The GO samples are reduced by hydrazine or vitamin C. Functionalization of RGO with the zwitterionic surfactant improves the degrees of reduction and defect repair of the two reducing agents and significantly increases the electrical conductivity of paperlike films compared with those prepared from unfunctionalized RGO.
采用 Langmuir-Blodgett 方法获得了几层厚度的还原氧化石墨（RGO）片的薄膜，这些 RGO 片由两性离子表面活性剂 N-十二烷基-N，N-二甲基-3-氨丙磺酸钠（DDPS）功能化。通过 X 射线光电子能谱、原子力显微镜（AFM）、场发射扫描电子显微镜（SEM）、微拉曼光谱和电导率测量来分析还原和缺陷修复的程度，以检查 RGO 片的质量。采用改良的 Hummers 法获得高度氧化的石墨氧化物（GO），并采用基于离心的方法提高 GO 的质量。GO 样品分别用联氨或维生素 C 还原。用两性离子表面活性剂对 RGO 进行功能化，改善了两种还原剂的还原程度和缺陷修复程度，并显著提高了纸状薄膜的电导率，与用未功能化的 RGO 制备的薄膜相比。
