High-performance triboelectric nanogenerator with enhanced energy density based on single-step fluorocarbon plasma treatment - Zhang, Xiao-Sheng; Han, Meng-Di; Wang, Ren-Xin; Meng, Bo; Zhu, Fu-Yun; Sun, Xu-Ming; Wei Hu; Wei Wang; Li, Zhi-Hong; Zhang, Hai-Xia (Nano Energy, 2014)