[1] City Univ Hong Kong, Dept Phys & Mat Sci, Tat Chee Ave, Kowloon 999077, Hong Kong, Peoples R China
[2] Leibniz IFW Dresden, Inst Integrat Nanosci, Helmholtzstr 20, D-01069 Dresden, Germany
[3] Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710049, Shaanxi, Peoples R China
[4] Chinese Acad Sci, Ctr Biomed Mat & Interfaces, Shenzhen Inst Adv Technol, Shenzhen 518055, Peoples R China
[5] Monash Univ, Dept Chem Engn, Clayton, Vic 3800, Australia
[6] Tech Univ Chemnitz, Mat Syst Nanoelect, Reichenhainer Str 70, D-09107 Chemnitz, Germany