1. Carbon
Nanomaterials Design Laboratory, Research Institute of Advanced Materials,
and Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Republic of Korea
2. Division
of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, the United States
3. Advanced
Nanohybrids Laboratory, Department of Applied Organic Materials Engineering, Inha University, Incheon 402-751, Republic of Korea