Qingdao University, Qingdao University, Qingdao University, Qingdao University, Hong Kong University of Science & Technology (HKUST), Qingdao University, Qingdao University, National University of Singapore (NUS) - Center for Nanofibers and Nanotechnology, Hong Kong University of Science & Technology (HKUST) and Qingdao University - University-Industry Joint Center for Ocean Observation and Broadband Communication