1. Department of Nano and Biosurface
Science, University of Science and Technology, 217 Gajeong-ro, Yuseong-Gu, Daejeon 305-350, Republic of Korea
2. Department of Nanomaterials
Science and Engineering, University of Science and Technology, 217 Gajeong-ro, Yuseong-Gu, Daejeon 305-350, Republic of Korea
3. Division of Industrial Metrology, Korea Research Institute of Standards and Science,
209 Gajeong-ro, Yuseong-gu, Daejeon 305-600, Republic of Korea
4. Department of Electrical Engineering, University of South Florida, Tampa, Florida 33620,
United States
5. Department
of Physics, Yonsei University, 50 Yonsei-ro,
Seodaemun-gu, Seoul
120-749, Republic of Korea