1. Institute for Integrative Nanosciences, Leibniz IFW Dresden, 01069 Dresden, Germany
2. Material Systems for Nanoelectronics, Chemnitz University of Technology, 09107 Chemnitz, Germany
3. Center for Materials, Architectures and Integration of Nanomembranes (MAIN), Chemnitz University of Technology, 09126 Chemnitz, Germany
4. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 130022 Changchun, China