Affiliation: | a Department of Electronic Engineering and Research Center for Micro/Nano Technology, Tungnan University, Taipei, Taiwan b Graduate Institute of Electro-optical Engineering, Tatung University, Taipei, Taiwan c Department of Electrical Engineering, Tung Fang Institute of Technology, Kaohsiung, Taiwan d Department of Materials Engineering, Ming Chi University of Technology, Taipei, Taiwan e Chemistry Department, Chung Yuan Christian University, Chung-Li, Taiwan |