[1] Univ Munster, Phys Inst, D-48149 Munster, Germany
[2] Univ Munster, Ctr Nanotechnol CeNTech, D-48149 Munster, Germany
[3] North Univ China, Sch Mat Sci & Engn, Shanxi Prov Key Lab Funct Nanocomposites, Taiyuan 030051, Peoples R China
[4] Soochow Univ, Jiangsu Key Lab Carbon Based Funct Mat & Devices, Inst Funct Nano & Soft Mat FUNSOM, Suzhou 215123, Peoples R China
[5] Soochow Univ, Collaborat Innovat Ctr Suzhou Nano Sci & Technol, Suzhou 215123, Peoples R China
[6] Soochow Univ, Collaborat Innovat Ctr Suzhou Nano Sci & Technol, Suzhou 215123, Peoples R China
[7] Jilin Univ, Coll Chem, Minist Educ, Key Lab Supramol Struct & Mat, Changchun 130012, Peoples R China