Author Affiliations

Talib Hussain,^a,b,e Liubiao Zhong,^b Mohammad Danesh,^c Huiqi Ye,^a Ziqiang Liang,^b Dong Xiao,^a Cheng-Wei Qiu,^c Chaogang Lou,^d Lifeng Chi,^*,b and Lin Jiang^*,b

^aNational Astronomical Observatories/Nanjing Institute of Astronomical Optics & Technology, Key Laboratory of Astronomical Optics & Technology, Nanjing Institute of Astronomical Optics & Technology, Chinese Academy of Sciences, Nanjing, Jiangsu 210042, P. R. China

^bInstitute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-based Functional Materials and Devices & Collaborative Innovation Center of Suzhou Nano Science & Technology, Soochow University, Suzhou, Jiangsu 215123, P. R. China.

^cDepartment of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117576, Singapore

^dSchool of Electronic Science & Engineering, Southeast University, Nanjing, 210096, P.R. China

^eUniversity of Chinese Academy of Sciences, Beijing, 100049, P. R. China

^†Electronic supplementary information (ESI) available. See DOI: 10.1039/c5nr01038a

^*Corresponding author: ljiang@suda.edu.cn, chilf@suda.edu.cn