National Natural Science Foundation of China(51102184,51172163);National High Technology Research and Development Program of China(2013AA031801);National Key Technology Research and Development Program of China(2013BAJ01B01);Shanghai Municipal Science and Technology Commission Nano Special Project,China(12nm0503001,11nm0501600);Open Foundation of Key Laboratory of Infrared Imaging Materials and Detectors,China(IIMDKFJJ-12-04)