基金supported by the Natural Science Foundation of Anhui Province, China (070414186)Program of Science and Technology of Anhui Province, China (2008AKKG0332)+1 种基金Nippon Sheet Glass Foundation for Materials Science and Engineering, China (070304B2)Open Project Program of Key Laboratory of Low Dimensional Materials & Application Technology (Xiangtan University), Ministry of Education of China (DWKF0802)~~