1. Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, 117585, Singapore
2. School of Materials Science and Engineering, Beihang University, No. 37 Xueyuan Road, Beijing, 100083, P. R. China
3. Department of Chemistry and Biochemistry, Northern Illinois University, 1425 W. Lincoln Highway, DeKalb, Illinois 60115, United States
4. Department of Materials Science and Engineering National University of Singapore, 9 Engineering Drive 1, 117575, Singapore
5. School of Engineering, Temasek Polytechnic, 21 Tampines Avenue 1, 529757, Singapore
6. X-Ray Science Division, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, United States