1. Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei 10608, Taiwan
2. Research and Development Center for Smart Textile Technology, National Taipei University of Technology, Taipei 10608, Taiwan
3. Department of Materials, Imperial College London, London SW7 2AZ, U.K.
4. Department of Electro-Optical Engineering, National Taipei University of Technology, Taipei 10608, Taiwan