1. Department
of Materials Science and Engineering, South University of Science and Technology of China, No. 1088, Xueyuan Road, Shenzhen, Guangdong 518055, China
2. Department
of Chemistry and the Materials Research Center, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
3. Polyera Corporation, 8045 Lamon Avenue, Skokie, Illinois 60077, United States