1. Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543 Republic of Singapore
2. Shaanxi Key Laboratory of Flexible Electronics, Northwestern Polytechnical University, Xi’an 710072, China
3. Graduate School for Integrative Sciences Engineering (NGS), National University of Singapore, 28 Medical Drive 3, 117456 Republic of Singapore
4. Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Binhai New City, Fuzhou 350207, China