1. Division of Physical Science and Engineering; King Abdullah University of Science and Technology; Thuwal 23955-6900 Kingdom of Saudi Arabia
2. Department of Electrical and Computer Engineering; University of Toronto; 10 King's College Road Toronto Ontario M5S 3G4 Canada
3. Department of Chemistry and Nano Science; Ewha Woman's University; 52, Ewhayeodae-gil Seodaemun-gu Seoul 03760 Korea
4. Department of Materials Science and Engineering; University of Toronto; 184 College Street Toronto Ontario M5S 3E4 Canada
5. Imaging and Characterization Laboratory; King Abdullah University of Science and Technology; Thuwal 23955-6900 Kingdom of Saudi Arabia