Infrared spectroscopy of ZnO nanoparticles containing CO2 impurities

Hlaing Oo, W. M.; McCluskey, M. D.; Lalonde, A. D.; Norton, M. G.
February 2005
Applied Physics Letters;2/14/2005, Vol. 86 Issue 7, p073111
Academic Journal
Impurities play a major role in determining the optical and electrical properties of semiconductor nanoparticles. In this work, the presence and source of CO2 impurities in ZnO nanoparticles were studied by IR absorption spectroscopy. Isotopic substitution was used to verify the vibrational frequency assignment. Isochronal annealing experiments were performed to study the formation and stability of the molecular impurities. Our results indicate that the molecules are much more stable than CO2 adsorbed on bulk ZnO surfaces. By comparing our observations with similar results from IR spectroscopy of CO2 trapped in carbon nanotubes [C. Matranga, L. Chen, M. Smith, E. Bittner, J. K. Johnson, and B. Bockrath, J. Phys. Chem. B 107, 12930 (2003)], we conclude that the molecules are trapped in the ZnO nanoparticles.


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