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Anisotropic cation exchange in PbSe/CdSe core/shell nanocrystals of different geometry

Marianna Casavola, Marijn A van Huis, Sara Bals, Karel Lambert UGent, Zeger Hens UGent and Daniel Vanmaekelbergh (2012) CHEMISTRY OF MATERIALS. 24(2). p.294-302
abstract
We present a study of Cd2+-for-Pb2+ exchange in PbSe nanocrystals (NCs) with cube, star, and rod shapes. Prolonged temperature-activated cation exchange results in PbSe/CdSe heterostructured nanocrystals (HNCs) that preserve their specific overall shape, whereas the PbSe core is strongly faceted with dominance of {111} facets. Hence, cation exchange proceeds while the Se anion lattice is preserved, and well-defined {111}/{111} PbSe/CdSe interfaces develop. Interestingly, by quenching the reaction at different stages of the cation exchange new structures have been isolated, such as core-shell nanorods, CdSe rods that contain one or two separated PbSe dots and fully zinc blende CdSe nanorods. The crystallographically anisotropic cation exchange has been characterized by a combined HRTEM/HAADF-STEM study of heterointerface evolution over reaction time and temperature. Strikingly, Pb and Cd are only intermixed at the PbSe/CdSe interface. We propose a plausible model for the cation exchange based on a layer-by-layer replacement of Pb2+ by Cd2+ enabled by a vacancy-assisted cation migration mechanism.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
core/shell nanocrystals, cation exchange, near-infrared-active nanocrystals, HAADF-STEM, PbSe/CdSe, SEMICONDUCTOR NANOCRYSTALS, COLLOIDAL NANOCRYSTALS, NANORODS, CDSE, PBSE
journal title
CHEMISTRY OF MATERIALS
Chem. Mat.
volume
24
issue
2
pages
294 - 302
Web of Science type
Article
Web of Science id
000299367500008
JCR category
MATERIALS SCIENCE, MULTIDISCIPLINARY
JCR impact factor
8.238 (2012)
JCR rank
13/239 (2012)
JCR quartile
1 (2012)
ISSN
0897-4756
DOI
10.1021/cm202796s
project
Center for nano- and biophotonics (NB-Photonics)
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
2979483
handle
http://hdl.handle.net/1854/LU-2979483
date created
2012-09-05 17:38:38
date last changed
2014-05-26 09:46:55
@article{2979483,
  abstract     = {We present a study of Cd2+-for-Pb2+ exchange in PbSe nanocrystals (NCs) with cube, star, and rod shapes. Prolonged temperature-activated cation exchange results in PbSe/CdSe heterostructured nanocrystals (HNCs) that preserve their specific overall shape, whereas the PbSe core is strongly faceted with dominance of \{111\} facets. Hence, cation exchange proceeds while the Se anion lattice is preserved, and well-defined \{111\}/\{111\} PbSe/CdSe interfaces develop. Interestingly, by quenching the reaction at different stages of the cation exchange new structures have been isolated, such as core-shell nanorods, CdSe rods that contain one or two separated PbSe dots and fully zinc blende CdSe nanorods. The crystallographically anisotropic cation exchange has been characterized by a combined HRTEM/HAADF-STEM study of heterointerface evolution over reaction time and temperature. Strikingly, Pb and Cd are only intermixed at the PbSe/CdSe interface. We propose a plausible model for the cation exchange based on a layer-by-layer replacement of Pb2+ by Cd2+ enabled by a vacancy-assisted cation migration mechanism.},
  author       = {Casavola, Marianna and van Huis, Marijn A and Bals, Sara and Lambert, Karel and Hens, Zeger and Vanmaekelbergh, Daniel},
  issn         = {0897-4756},
  journal      = {CHEMISTRY OF MATERIALS},
  keyword      = {core/shell nanocrystals,cation exchange,near-infrared-active nanocrystals,HAADF-STEM,PbSe/CdSe,SEMICONDUCTOR NANOCRYSTALS,COLLOIDAL NANOCRYSTALS,NANORODS,CDSE,PBSE},
  language     = {eng},
  number       = {2},
  pages        = {294--302},
  title        = {Anisotropic cation exchange in PbSe/CdSe core/shell nanocrystals of different geometry},
  url          = {http://dx.doi.org/10.1021/cm202796s},
  volume       = {24},
  year         = {2012},
}

Chicago
Casavola, Marianna, Marijn A van Huis, Sara Bals, Karel Lambert, Zeger Hens, and Daniel Vanmaekelbergh. 2012. “Anisotropic Cation Exchange in PbSe/CdSe Core/shell Nanocrystals of Different Geometry.” Chemistry of Materials 24 (2): 294–302.
APA
Casavola, M., van Huis, M. A., Bals, S., Lambert, K., Hens, Z., & Vanmaekelbergh, D. (2012). Anisotropic cation exchange in PbSe/CdSe core/shell nanocrystals of different geometry. CHEMISTRY OF MATERIALS, 24(2), 294–302.
Vancouver
1.
Casavola M, van Huis MA, Bals S, Lambert K, Hens Z, Vanmaekelbergh D. Anisotropic cation exchange in PbSe/CdSe core/shell nanocrystals of different geometry. CHEMISTRY OF MATERIALS. 2012;24(2):294–302.
MLA
Casavola, Marianna, Marijn A van Huis, Sara Bals, et al. “Anisotropic Cation Exchange in PbSe/CdSe Core/shell Nanocrystals of Different Geometry.” CHEMISTRY OF MATERIALS 24.2 (2012): 294–302. Print.