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

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)3725-3735
Number of pages11
JournalPhysical Chemistry Chemical Physics
Volume15
Issue number11
DOIs
Publication statusPublished - 2013 Mar 21
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Physics and Astronomy(all)

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