Quantum chemical investigation of epoxide and ether groups in graphene oxide and their vibrational spectra

Alister J. Page, Chien Pin Chou, Buu Q. Pham, Henryk A. Witek, Stephan Irle*, Keiji Morokuma

*この研究の対応する著者

研究成果: Article査読

50 被引用数 (Scopus)

抄録

We present a detailed analysis of the factors influencing the formation of epoxide and ether groups in graphene nanoflakes using conventional density functional theory (DFT), the density-functional tight-binding (DFTB) method, π-Hückel theory, and graph theoretical invariants. The relative thermodynamic stability associated with the chemisorption of oxygen atoms at various positions on hexagonal graphene flakes (HGFs) of D6h-symmetry is determined by two factors-viz. The disruption of the π-conjugation of the HGF and the geometrical deformation of the HGF structure. The thermodynamically most stable structure is achieved when the former factor is minimized, and the latter factor is simultaneously maximized. Infrared (IR) spectra computed using DFT and DFTB reveal a close correlation between the relative thermodynamic stabilities of the oxidized HGF structures and their IR spectral activities. The most stable oxidized structures exhibit significant IR activity between 600 and 1800 cm-1, whereas less stable oxidized structures exhibit little to no activity in this region. In contrast, Raman spectra are found to be less informative in this respect.

本文言語English
ページ(範囲)3725-3735
ページ数11
ジャーナルPhysical Chemistry Chemical Physics
15
11
DOI
出版ステータスPublished - 2013 3月 21
外部発表はい

ASJC Scopus subject areas

  • 物理化学および理論化学
  • 物理学および天文学(全般)

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