1. Institute of Materials Research and Engineering (IMRE) Agency for Science Technology and Research (A*STAR) 2 Fusionopolis Way Singapore Singapore 138634 Singapore
2. Department of Electrical and Electronic Engineering Southern University of Science and Technology Shenzhen 518055 P. R. China
3. Department of Materials Science and Technology National University of Singapore 117576 Singapore
4. Institute of Sustainability for Chemical Engineering and Environment (ISCE2), A*STAR 1 Pesek Road Singapore 627833 Singapore
5. Department of Chemistry National University of Singapore Block S8 Level 3 3 Science Drive 3 Singapore 117543 Singapore