[Zhang, Jianming; Tian, Ye; Zhang, Baoshun] Chinese Acad Sci, Suzhou Inst Nanotech & Nanobion SINANO, Suzhou 212213, Peoples R China.
[Tian, Ye] Hunan City Univ, Sch Commun & Elect Engn, Yiyang 413000, Peoples R China.
[Liu, Qian; Tian, Ye] Natl Ctr Nanosci & Technol NCNST, Beijing 100190, Peoples R China.
[Zhang, Jianming] Suzhou HWN Nanotec Co LTD, Suzhou 212213, Peoples R China.
[Guo, Chuan Fei] Univ Houston, Dept Phys, Houston, TX 77204 USA.