1. College of Chemistry and Chemical EngineeringQingdao University Qingdao 266071 P. R. China
2. State Key Laboratory of Bio‐fibers and Eco‐textilesCollaborative Innovation Center of Marine Biobased Fibers and Ecological TextilesSchool of Environmental Science and EngineeringQingdao University Qingdao 266071 P. R. China
3. Department of Electrical and Computer EngineeringUniversity of Toronto Toronto Ontario M5S 1A1 Canada
4. College of PhysicsQingdao University Qingdao 266071 P. R. China