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Appl. Phys. Lett. 102, 131901 (2013).
Kyujin Choi, Juhwan Lim, J. R. Rani, Hyong Seo Yoon, Juyeong Oh,Taeyoon Hong, Taewoo Ha, Byung Cheol Park, Kyung Ik Sim, Seong Chan Jun, Jae Hoon Kim.
Department of Physics and Institute of Physics and Applied Physics, Yonsei University, Seoul 120-749, Republic of Korea and
Department of Mechanical Engineering, Yonsei University, Seoul 120-749, Republic of Korea.
Abstract
We report on our terahertz and optical study of monolayer graphene grown by chemical vapor deposition and processed by plasma oxidation. The plasma oxidation induces oxygen-related defects, and the resulting disorder increases the sheet resistance of graphene as measured via terahertz spectroscopy. The excitonic absorption peak weakens considerably and blue shiftsupon plasma oxidation, resulting in higher transmittance in both the visible and ultraviolet regions. Our oxygen plasma-treated graphene also exhibits a free-carrier doping effect as confirmed by the blue shift of the Raman G band.
© 2013 American Institute of Physics
