[1] Univ Calif Santa Barbara, Mat Res Lab, Santa Barbara, CA 93106 USA
[2] Beijing Inst Technol, Sch Mat Sci & Engn, Beijing, Peoples R China
[3] Soongsil Univ, Dept Organ Mat & Fiber Engn, Seoul, South Korea
[4] Univ Calif Santa Barbara, Dept Chem & Biochem, Santa Barbara, CA 93106 USA
[5] Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA