Multiple scattering effects on the EXAFS of Ge nanocrystals

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dc.contributor.authorAraujo, LLen_AU
dc.contributor.authorForan, GJen_AU
dc.contributor.authorRidgway, MCen_AU
dc.date.accessioned2008-08-08T06:24:58Zen_AU
dc.date.accessioned2010-04-30T05:05:52Zen_AU
dc.date.available2008-08-08T06:24:58Zen_AU
dc.date.available2010-04-30T05:05:52Zen_AU
dc.date.issued2008-04-23en_AU
dc.date.statistics2008-04en_AU
dc.description.abstractWe present a detailed extended x-ray absorption fine structure (EXAFS) spectroscopy study on the influence of multiple scattering effects on the analysis of bulk polycrystalline Ge (c-Ge) and of four Ge nanocrystal (NC) distributions with mean sizes from 4 to 9 nm. A complete description of the EXAFS signal up to the third shell of nearest neighbours for both c-Ge and Ge NCs is only achieved by including at least two double scattering and one triple scattering path. Unlike reports for bulk semiconductors and Ge-Si quantum dots, our results show that including only the most prominent double scattering path is insufficient for accurately ascertaining the structural parameters of the second and third shells, leading to unphysically small coordination numbers for the NCs. The same is observed when no multiple scattering paths are taken into account. The size dependence of the interatomic distance distributions up to the third shell of nearest neighbours has been determined for the first time. A greater reduction in coordination numbers and higher structural disorder were observed for the outer shells, reflecting the increase of the surface-to-volume ratio and reinforcing the presence of an amorphous Ge layer between the SiO2 matrix and the NCs. © 2008, Institute of Physicsen_AU
dc.identifier.articlenumber165210en_AU
dc.identifier.citationAraujo, L. L., Foran, G. J., & Ridgway, M. C. (2008). Multiple scattering effects on the EXAFS of Ge nanocrystals. Journal of Physics: Condensed Matter, 20(16), 9. doi:10.1088/0953-8984/20/16/165210en_AU
dc.identifier.govdoc1377en_AU
dc.identifier.issn0953-8984en_AU
dc.identifier.issue16en_AU
dc.identifier.journaltitleJournal of Physics: Condensed Matteren_AU
dc.identifier.pagination9en_AU
dc.identifier.urihttp://dx.doi.org/10.1088/0953-8984/20/16/165210en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/1168en_AU
dc.identifier.volume20en_AU
dc.language.isoenen_AU
dc.publisherInstitute of Physicsen_AU
dc.subjectParticlesen_AU
dc.subjectAbsorptionen_AU
dc.subjectMultiple scatteringen_AU
dc.subjectNanostructuresen_AU
dc.subjectAmorphous stateen_AU
dc.subjectFine structureen_AU
dc.titleMultiple scattering effects on the EXAFS of Ge nanocrystalsen_AU
dc.typeJournal Articleen_AU
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