电化学阳极氧化处理对超纳米金刚石/多层石墨烯复合薄膜电容性能的影响

Effect of Electrochemical Anodizing on Capacitance Performance of Ultrananocrystalline Diamond/Multilayer Graphene Composite Film

为解决表面疏水导致的超纳米金刚石/多层石墨烯复合薄膜(UNCD/MLG)电容性能差的问题,通过电化学阳极氧化工艺对微波等离子化学气相沉积的UNCD/MLG薄膜进行表面处理以改善其相应性能。采用场发射扫描电子显微镜(FESEM)对处理前后薄膜的表面微观形貌进行对照分析,并用拉曼光谱(Raman)、光电子能谱(XPS)和静态接触角(Contact angle)表征其表面微观状态,用循环伏安法(CV)和恒流充放电法(GCD)比较分析处理前后薄膜的电容性能。结果表明,与原始薄膜相比,处理后的薄膜由超疏水性变为亲水性,且其电容值最大提高约115倍,表明电化学阳极氧化处理可以有效地对UNCD/MLG薄膜进行表面改性,大幅提升其电容性能。

For the solution of the problem that the ultrananocrystalline diamond/multi-layer graphene composite film(UNCD/MLG)possesses poor capacitance performance due to its serious surface hydrophobicity,a surface modification by electrochemical anodizing was applied for the UNCD/MLG film prepared with microwave plasma chemical vapor deposition technology to improve that performance.The micromorphology of the film surface before and after anodizing was characterized by field emission scanning electron microscopy(FESEM),and the surface state was analyzed by photoelectron spectroscopy(XPS),Raman spectroscopy(Raman)and static contact angle.Moreover,the capacitive properties of the film before and after anodizing were examined with cyclic voltammetry(CV)and galvanostatic charge-discharge(GCD).The results show that the film changes from hydrophobic to hydrophilic after anodizing,and capacitance value of anodized film is increased by about 115 times,indicating that the film can be effectively modified by electrochemical anodization and its capacitive performance can be greatly improved.