[1] Wuhan Univ, Coll Chem & Mol Sci, Wuhan 430072, Peoples R China
[2] East China Normal Univ, Sch Phys & Elect Sci, State Key Lab Precis Spect, Shanghai 200062, Peoples R China
[3] Wuhan Univ, Inst Adv Studies, Ctr Nanosci & Nanotechnol, Sch Phys & Technol, Wuhan 430072, Peoples R China
[4] Wuhan Univ, Key Lab Artificial Micro & Nanostruct, Minist Educ, Wuhan 430072, Peoples R China