1. Nano Hybrid Technology Research Center, Korea Electrotechnology Research Institute (KERI), Changwon-si, Gyeongsangnam-do 51543, Republic of Korea
2. Electro-Functionality Materials Engineering, Korea University of Science and Technology (UST), Changwon-si, Gyeongsangnam-do 51543, Republic of Korea
3. Department of Electronics and Computer Engineering, Hanyang University, Seoul 133-791, Republic of Korea