| 초록 |
Graphene synthesized via Chemical Vapor Deposition (CVD) can be achieved in a uniform and large area with high degree of purity. Due to the excellent mechanical properties of such synthesized graphene, it might be applicable as low friction material in both micro- and nano-scale systems. Also, few layers graphene will be helpful in reducing the wear of a material. Graphene synthesized by CVD was characterized by optical microscopy (OM), atomic force microscope (AFM), Raman spectrometer. Single to bilayer graphene was confirmed on Cu whereas single-few layers of graphene was confirmed for Ni. Single to few-layer of the graphene grown via CVD were tested regarding its friction behavior in both micro and nano-scale by using micro-tribometer and AFM Si-tip in ambient environment, respectively. The friction coefficient of as-grown graphene was reduced approximately by 80% compared to the bare substrates without graphene in nano-scale friction tests. It was also reduced the friction coefficient of graphene transferred on SiO2/Si as compared to the bare SiO2/Si. The wear behavior of both as-grown and transferred graphene was also studied and the wear rate was significantly reduced. The significance of graphene layers on sliding contact surfaces was proved to minimize the friction and wear of materials. Therefore, graphene can be considered as two-dimensional thinnest lubricious coating on sliding pairs in micro and nano-scale systems. |
