Structural Disorder in Colloidal InAs and CdSe Nanocrystals Observed by X-Ray Absorption Near-Edge Spectroscopy

Journal Article · Fri Oct 01 00:00:00 EDT 1999 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.83.3474· OSTI ID:688039

Hamad, K S; Hamad, K S; Roth, R; Roth, R; Rockenberger, J; Rockenberger, J; Alivisatos, A P; Alivisatos, A P ^[1]; van Buuren, T ^[2]

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1. the Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
2. Chemistry and Materials Science Department, Lawrence Livermore National Laboratory, Livermore, California 94550; Harvard University, Cambridge, Massachusetts 02138 (United States)

We report the observation of size dependent structural disorder by x-ray absorption near-edge spectroscopy (XANES) in InAs and CdSe nanocrystals 17{endash}80thinspthinsp{Angstrom} in diameter. XANES of the In and Cd M{sub 4,5} edges yields features that are sharp for the bulk solid but broaden considerably as the size of the particle decreases. FEFF7 multiple-scattering simulations reproduce the size dependent broadening of the spectra if a bulklike surface reconstruction of a spherical nanocrystal model is included. This illustrates that XANES is sensitive to the structure of the entire nanocrystal including the surface. {copyright} {ital 1999} {ital The American Physical Society }

• OSTI ID: 688039
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 17 Vol. 83; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
ABSORPTION SPECTRA
ADVANCED LIGHT SOURCE
CADMIUM SELENIDES
COLLOIDS
INDIUM ARSENIDES
LINE BROADENING
MULTIPLE SCATTERING
PARTICLE SIZE
STRUCTURAL CHEMICAL ANALYSIS
X-RAY SPECTROSCOPY