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

A. S. Masadeh, E. S. Božin, C. L. Farrow, G. Paglia, P. Juhas, S. J. L. Billinge, A. Karkamkar, and M. G. Kanatzidis
Phys. Rev. B 76, 115413 – Published 12 September 2007

Abstract

The size-dependent structure of CdSe nanoparticles, with diameters ranging from 2to4nm, 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 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 2nm diameter particles. This study demonstrates the size-dependent quantitative structural information that can be obtained even from very small nanoparticles using the PDF approach.

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  • Received 9 April 2007
  • Accepted 3 August 2007

DOI:https://doi.org/10.1103/PhysRevB.76.115413

©2007 American Physical Society

Authors & Affiliations

A. S. Masadeh, E. S. Božin, C. L. Farrow, G. Paglia, P. Juhas, and S. J. L. Billinge*

  • Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824-1116, USA

A. Karkamkar and M. G. Kanatzidis

  • Department of Chemistry, Michigan State University, East Lansing, Michigan 48824-1116, USA

  • *billinge@pa.msu.edu

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Vol. 76, Iss. 11 — 15 September 2007

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