1. Department of Chemistry Faculty of Science National University of Singapore 3 Science Drive 3 Singapore 117543 Singapore
2. MOE Key Laboratory of Macromolecular Synthesis and Functionalization State Key Laboratory of Silicon Materials Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China
3. Bredesen Centre for Interdisciplinary Research and Graduate Education University of Tennessee Knoxville TN 37996 USA
4. Computational Sciences and Engineering Division & Chemical Sciences Division Oak Ridge National Laboratory Oak Ridge TN 37831 USA
5. Joint School of National University of Singapore and Tianjin University International Campus of Tianjin University Binhai New City, Fuzhou 350207 China