1. Department of Materials Science and EngineeringCity University of Hong Kong 83 Tat Chee Avenue Kowloon Hong Kong SAR 999077 China
2. Songshan Lake Materials Laboratory Dongguan Guangdong 523808 China
3. National Engineering Research Center for Advanced Polymer Processing TechnologyZhengzhou University Zhengzhou Henan 450002 China
4. Centre for Functional PhotonicsCity University of Hong Kong Kowloon Hong Kong SAR 999077 China