1. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Center for Advanced Low-dimension Materials College of Materials Science and Engineering Donghua University Shanghai 201620 China
2. Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan Hubei 430205 China
3. Department of Physics and Astronomy and the Nanoscale & Quantum Phenomena Institute Ohio University Athens OH 45701 USA
4. Center for Molecular Design and Biomimetics The Biodesign Institute, School of Molecular Sciences Arizona State University Tempe AZ 85287 USA