1. Electronic Materials Research Laboratory; Key Laboratory of the Ministry of Education & International Center for Dielectric Research; Xi'an Jiaotong University; Xi'an 710049 China
2. Department of Chemistry and 4D LABS; Simon Fraser University; Burnaby British Columbia, V5A 1S6 Canada
3. Leibniz − Institut für Polymerforschung Dresden e.V. Hohe Strasse 6; Dresden 01069 Germany