1. Technical Center China State Construction Engineering Co., Ltd. Beijing 101300 China
2. Department of Civil and Environmental Engineering The Hong Kong Polytechnic University Hung Hom Hong Kong China
3. Department of Electrical Engineering The Hong Kong Polytechnic University Hung Hom Hong Kong China
4. Department of Chemistry Renmin University of China Beijing 100872 China
5. School of Electrical Engineering and Computer Science Pennsylvania State University University Park PA 16802 USA
6. Department of Applied Physics The Hong Kong Polytechnic University Hung Hom Hong Kong China
7. Department of Materials Science and Engineering City University of Hong Kong 83 Tat Chee Avenue Kowloon Hong Kong China
8. Harbin Zhongke Materials Engineering Co., Ltd. Harbin 150050 China
9. Department of Electrical Engineering and Ginzton Laboratory Stanford University Stanford CA 94305‐4088 USA