[1] Hankyong Natl Univ, Dept Chem Engn, Anseong 456749, Gyeonggi Do, South Korea
[2] Hankyong Natl Univ, Ctr Chem Technol, Anseong 456749, Gyeonggi Do, South Korea
[3] Korea Res Inst Chem Technol, Div Adv Mat, Taejon 305600, Yuseong, South Korea
[4] Sunchon Natl Univ, Dept Phys, Sunchon 540950, Chunam Do, South Korea