SKKU Advanced Institute of Nanotechnology (SAINT) and Center for Human Interface Nano Technology (HINT), School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon 440-746, Korea.
ACS Nano. 2012 Mar 27;6(3):2096-103. doi: 10.1021/nn203923n. Epub 2011 Dec 19.
A uniform polymer thin layer of controllable thickness was bar-coated onto a chemical vapor deposition (CVD) grown monolayer graphene surface. The effects of this coating layer on the optical, electric, and tribological properties were then investigated. The thin polymer coating layer did not reduce the optical transmittance of the graphene films. The variation in the sheet resistance of the graphene films after the coating depended on the interaction between polymer and graphene. The top coating layer can maintain the high conductivity of chemical doped graphene films under long-term ambient conditions compared with uncovered doped samples. Friction tests demonstrated that the polymer coating layer can enhance both the friction force and the coefficient of friction of the graphene films and protect the graphene against damage in the repeated sliding processes.
一层均匀的、厚度可控的聚合物薄膜通过棒涂的方式覆盖在化学气相沉积（CVD）生长的单层石墨烯表面上。然后研究了该涂层对光学、电学和摩擦学性能的影响。该聚合物薄膜涂层并未降低石墨烯薄膜的光透过率。涂层后石墨烯薄膜的方阻值变化取决于聚合物和石墨烯之间的相互作用。与未覆盖的掺杂样品相比，顶层涂层可以在长期的环境条件下保持化学掺杂石墨烯薄膜的高导电性。摩擦试验表明，聚合物涂层可以增加石墨烯薄膜的摩擦力和摩擦系数，并在反复滑动过程中保护石墨烯免受损伤。
