a
School of Semiconductor and Chemical Engineering, Chonbuk National University, Duckjin-dong 664-14, Jeonju 561-756, Korea
E-mail: shlee66@jbnu.ac.kr
;
Fax: +82-63-270-2306
;
Tel: +82-63-270-2435
b
Clean Energy Research Center, Korea Institute of Science and Technology, Seoul 130-650, Republic of Korea
c
Inorganic Nanomaterials Laboratory, Department of Chemistry, Hanyang University, Seoul, Republic of Korea
d
Testing and Certification Center, Korea Institute of Energy Research, Daejeon, Republic of Korea