1. Thin Film Materials Research Center; Korea Research Institute of Chemical Technology (KRICT); Yuseong Post Office Box 107 Daejeon 305-600 Republic of Korea
2. School of Electrical and Electronic Engineering; Yonsei University; 50 Yonsei-ro Seodaemun-gu Seoul 03722 Republic of Korea
3. Department of Materials Science and Engineering; Korea Advanced Institute of Science and Technology; Daejeon 34141 Republic of Korea
4. Nano-Surface Research Group; Korea Basic Science Institute; Daejeon 302-333 Republic of Korea
5. Department of Nanomechanics; Nano-Convergence Mechanical Systems Research Division; Korea Institute of Machinery and Materials (KIMM); 156 Gajungbuk-ro Yuseong-gu Daejeon 305-343 Republic of Korea