[Zhu, Huali] Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Changsha 410114, Hunan, Peoples R China.
[Zhu, Huali] Univ New Hampshire, Dept Chem, Durham, NH 03824 USA.
[Zhu, Huali] Univ New Hampshire, Mat Sci Program, Durham, NH 03824 USA.
[Cao, Kaifeng; Gong, Xiaolong; Chen, Zhaoyong; Li, Qifeng] Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha 410114, Hunan, Peoples R China.