a
Department of Mechanical Engineering and KI for the NanoCentury, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, Korea
E-mail: inkyu @kaist.ac.kr
;
Fax: +82-42-350-3210
;
Tel: +82-42-350-3233
b
Department of Nano Manufacturing Technology, Korea Institute of Machinery and Materials (KIMM), Daejeon 305-343, Korea
E-mail: jihyelee @kimm.re.kr
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Fax: +82-42-868-7123
;
Tel: +82-42-868-7801
c
Department of Chemistry, Korea University, Jochiwon 339-700, Korea