Optical properties of nitrogen-doped graphene thin films probed by spectroscopic ellipsometry

C. C. Shen, C. C. Tseng, C. T. Lin, L. J. Li, H. L. Liu*


研究成果: 雜誌貢獻期刊論文同行評審

14 引文 斯高帕斯(Scopus)


Nitrogen-doped graphene thin films were prepared by either chemical vapor deposition (CVD) or electrochemical exfoliation (ECE). Their optical properties were determined in the spectral region of 0.73-6.42 eV and at temperatures between 200 and 350 K by spectroscopic ellipsometry. The parameters of the dispersive structures were derived by numerical fitting of the experimental data to the stacked layer model. The optical absorption spectrum of the CVD-grown thin films is characterized by an asymmetric Fano resonance in the ultraviolet frequency region. In contrast, the line shape of the ECE-grown thin films displays less asymmetric. The excitonic resonance of the nitrogen-doped thin films is overall blue shifted by ∼ 0.2-0.3 eV compared with that of undoped analog. We interpret these results in terms of the exothermic nature of triazine molecule adsorption due to binding to graphene's surface via electron rich nitrogen.

頁(從 - 到)675-679
期刊Thin Solid Films
出版狀態已發佈 - 2014 11月 28

ASJC Scopus subject areas

  • 電子、光磁材料
  • 表面和介面
  • 表面、塗料和薄膜
  • 金屬和合金
  • 材料化學


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