Adsorption and decomposition of methane on gallium oxide films

D. Kohl, Th Ochs, W. Geyer, M. Fleischer, H. Meixner

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Surface reactions are investigated by a sensitive mass spectrometer. Ga2O3 films are exposed to square pulses of methane. From the experimental data the desorption energies and the frequency factors are calculated for H2O and CO2. Semiempirical Hartree-Fock calculations with the Modified Neglect of Diatomic Overlap - Parametric Method 3 (MNDO-PM3) method give information about the adsorption process. The energy gain of physisorption amounts to 0.27 eV. The Heat of Formation (HoF) of the chemisorbed CH3 group and the H atom is 4.05 eV lower in comparison to the value of the physisorbed methane. After the COlatt. group formation the energy gain is 7.33 eV. The binding energy of the formed COlatt. is calculated to 2.07 eV. The charge transfer is estimated using the Mulliken charges. A reaction scheme for the catalytic oxidation of methane by lattice oxygen is proposed.

Original languageEnglish
Pages (from-to)140-145
Number of pages6
JournalSensors and Actuators, B: Chemical
Volume59
Issue number2
DOIs
Publication statusPublished - Oct 19 1999

Fingerprint

gallium oxides
Methane
Gallium
Oxide films
oxide films
methane
Decomposition
decomposition
Adsorption
adsorption
Physisorption
Catalytic oxidation
Surface reactions
Mass spectrometers
heat of formation
Binding energy
surface reactions
mass spectrometers
energy
Charge transfer

ASJC Scopus subject areas

  • Analytical Chemistry
  • Electrochemistry
  • Electrical and Electronic Engineering

Cite this

Adsorption and decomposition of methane on gallium oxide films. / Kohl, D.; Ochs, Th; Geyer, W.; Fleischer, M.; Meixner, H.

In: Sensors and Actuators, B: Chemical, Vol. 59, No. 2, 19.10.1999, p. 140-145.

Research output: Contribution to journalArticle

Kohl, D. ; Ochs, Th ; Geyer, W. ; Fleischer, M. ; Meixner, H. / Adsorption and decomposition of methane on gallium oxide films. In: Sensors and Actuators, B: Chemical. 1999 ; Vol. 59, No. 2. pp. 140-145.
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