[Wu, Qiaofeng; Wu, Xu; Li, Shuyao; Liu, Xiaoyan] Xinyang Normal Univ, Coll Phys & Elect Engn, Xinyang 464000, Peoples R China.
[Zhang, Huanhuan] Xinyang Normal Univ, Collaborat Innovat Ctr Henan Prov Energy Saving B, Xinyang 464000, Peoples R China.
[Huang, Ke-Jing] Xinyang Normal Univ, Coll Chem & Chem Engn, Xinyang 464000, Peoples R China.
[Zhu, Zhihong; Zeng, Yan] Cent China Normal Univ, Inst Nanosci & Nanotechnol, Coll Phys Sci & Technol, Wuhan 430079, Hubei, Peoples R China.