Affiliation: | (1) Nano Materials Research Center and School of Chemical Engineering and Technology, Chonbuk National University, 561-756 Chonju, Republic of Korea;(2) Department of Semiconductor Science Technology, Chonbuk National University, 561-756 Chonju, Republic of Korea;(3) Department of Materials Science, University of North Texas, P.O. Box 305310, 76203-5310 Denton, Texas, USA |