[1] Swiss Fed Inst Technol, Dept Mat, Lab Multifunct Mat, Vladimir Prelog Weg 5, CH-8093 Zurich, Switzerland
[2] Ecole Polytech Fed Lausanne, Inst Mat, CH-1015 Lausanne, Switzerland
[3] Ecole Polytech Fed Lausanne, Interfac Bioengn Inst, CH-1015 Lausanne, Switzerland
[4] Natl Ctr Nanosci & Technol NCNST, 11 ZhongGuanCun BeiYiTiao, Beijing 100190, Peoples R China
[5] Friedrich Alexander Univ Erlangen Nurnberg, Dept Chem & Pharm, Erlangen, Germany
[6] Friedrich Alexander Univ Erlangen Nurnberg, Interdisciplinary Ctr Mol Mat, Erlangen, Germany