1. Department of Materials Science and Engineering; Advanced Research Center for Green Materials Science and Technology; National Taiwan University; No. 1, Sec. 4, Roosevelt Road Taipei City 10617 Taiwan
2. Department of Electronics Engineering; National Chiao Tung University; Hsinchu 300 Taiwan
3. Institute of Polymer Science and Engineering; National Taiwan University; No. 1, Sec. 4, Roosevelt Road Taipei City 10617 Taiwan