1. Energy Research Institute, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798
2. Interdisciplinary Graduate School, Nanyang Technological University, 21 Nanyang Link, Singapore 637371
3. Centre for Disruptive Photonic Technologies, TPI, SPMS, Nanyang Technological University, 21 Nanyang Link, Singapore 637371
4. Dipartimento di Chimica e Chimica Industriale, Università di Genova, via Dodecaneso 31, 16146 Genova, Italy