1. Department of Chemistry, College of Natural Sciences, Hanyang University, Seoul 04763, Republic of Korea
2. Division of Electronics, Information and Communication Engineering, Kangwon National University, Samcheok, Kangwon-do 24341, Republic of Korea
3. Environmental Safety Group, Korea Institute of Science and Technology (KIST) Europe, Campus E 7.1, D-66123 Saarbruecken, Germany