还原氧化石墨烯纸的制备及其性能对比

Preparation and Property Contrast of Reduced Graphene Oxide Papers

采用改性的Hummers法制备了高分散氧化石墨烯溶液,并通过先还原后抽滤和先抽滤后还原两种模式得到厚度为1-10μm的还原氧化石墨烯纸.由X线衍射、傅里叶变换红外光谱、拉曼光谱、热重分析、电镜分析和电阻率测试对材料的结构形貌和基本性能进行了表征.由正交实验确定了反应时间、还原剂用量和反应温度对还原氧化石墨烯纸电导率影响的大小,并推出最佳反应条件.对比肼溶液还原、肼蒸汽还原和高温脱氧还原氧化石墨烯纸,发现肼溶液还原制备的石墨烯纸质地均匀,并具有良好的柔韧性和导电性;而高温脱氧得到的还原氧化石墨烯纸具有金属光泽和最高的电导率,但由于质脆,直接作为柔性导电纸应用仍有一定难度.

The highly dispersive graphene oxide solution was synthesized via the modified Hummers method,and was further transferred into reduced graphene oxide papers with thickness of 1-10um by using reduction-filtration and filtration-reduction strategies.Such measurements as X-ray diffraction,Fourier-transform infrared spectroscopy,Raman spectroscopy,thermogravimetry,scanning electronic microscopy,and electric conductivity were applied to characterize the structure and properties of the prepared materials.The effect sequence of the experimental factors on the reduced graphene oxide paper was arranged through the orthogonal experiments,and the optimal condition was thus formulated.The reduced graphene oxide paper acquired from hydrazine solution reduction with satisfactory electric conductivity was uniform and highly flexible,while the one from high-thermal annealing with the highest conductivity however presented the poorest flexibility.