* Corresponding authors

^a State Key Laboratory of Silicon Materials, Cyrus Tang Center for Sensor Materials and Applications, Department of Materials Science & Engineering, Zhejiang University, Hangzhou 310027, China
E-mail: gdqian@zju.edu.cn

^b Department of Chemistry, University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78249-0698, USA
E-mail: banglin.chen@utsa.edu
Fax: +1 210-458-7428

^c Department of Chemistry, Zhejiang University, Hangzhou 310027, China

^d NIST Center for Neutron Research, Gaithersburg, Maryland 20899-6102, USA
E-mail: wzhou@nist.gov

^e Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, USA

^f Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6272, USA

^g Fujian Provincial Key Laboratory of Polymer Materials, Fujian Normal University, 3 Shangsan Road, Cangshang Region, Fuzhou 350007, China

^h Department of Chemistry and Biochemistry, Arizona State University, Tempe, AZ 85287, USA