Quantitative size-dependent structure and strain determination of CdSe nanoparticles using atomic pair distribution function analysis

The size-dependent structure of CdSe nanoparticles, with diameters ranging from 2 to 4 nm, has been studied using the atomic pair distribution function (PDF) method. The core structure of the measured CdSe nanoparticles can be described in terms of the wurtzite atomic structure with extensive stacki...

Full description

Saved in:
Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2007-09, Vol.76 (11), Article 115413
Main Authors: Masadeh, A. S., Božin, E. S., Farrow, C. L., Paglia, G., Juhas, P., Billinge, S. J. L., Karkamkar, A., Kanatzidis, M. G.
Format: Article
Language:English
Subjects:
BOND LENGTHS
CADMIUM SELENIDES
DENSITY
DISTRIBUTION FUNCTIONS
MATERIALS SCIENCE
NANOSTRUCTURES
PARTICLE SIZE
PARTICLES
RESIDUAL STRESSES
SEMICONDUCTOR MATERIALS
STACKING FAULTS
STRAINS
SURFACES
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The size-dependent structure of CdSe nanoparticles, with diameters ranging from 2 to 4 nm, has been studied using the atomic pair distribution function (PDF) method. The core structure of the measured CdSe nanoparticles can be described in terms of the wurtzite atomic structure with extensive stacking faults. The density of faults in the nanoparticles is {approx}50%. The diameter of the core region was extracted directly from the PDF data and is in good agreement with the diameter obtained from standard characterization methods, suggesting that there is little surface amorphous region. A compressive strain was measured in the Cd-Se bond length that increases with decreasing particle size being 0.5% with respect to bulk CdSe for the 2 nm diameter particles. This study demonstrates the size-dependent quantitative structural information that can be obtained even from very small nanoparticles using the PDF approach.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.76.115413