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Composition and size-dependent extinction coefficient of colloidal PbSe quantum dots

Iwan Moreels UGent, Karel Lambert UGent, David De Muynck UGent, Frank Vanhaecke UGent, Dirk Poelman UGent, José Martins UGent, G ALLAN and Zeger Hens UGent (2007) CHEMISTRY OF MATERIALS. 19(25). p.6101-6106
abstract
Inductively coupled plasma mass spectrometry (ICP-MS) was combined with UV-vis-NIR spectrophotometry and transmission electron microscopy to determine the nanocrystal composition and molar extinction coefficient epsilon of colloidal PbSe quantum dot (Q-PbSe) Suspensions. The ICP-MS results show a nonstoichiometric Pb/Se ratio, with a systematic excess of lead for all samples studied. The observed ratio is consistent with a faceted spherical Q-PbSe model, composed of a quasi stoichiometric Q-PbSe core terminated by a Ph surface shell. At high photon energies, we find that c scales with the nanocrystal volume, irrespective of the Q-PbSe size. From E, we calculated a size-independent absorption coefficient. Its value is in good agreement with the theoretical value for bulk PbSe. At the band gap, c is size-dependent. The resulting absorption coefficient increases quadratically with decreasing Q-PbSe size. Calculations of the oscillator strength of the first optical transition are in good agreement with theoretical tight binding calculations, showing that the oscillator strength increases linearly with Q-PbSe size.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
ABSORPTION CROSS-SECTION, OPTICAL-PROPERTIES, NANOCRYSTALS, CDSE, CDTE
journal title
CHEMISTRY OF MATERIALS
Chem. Mat.
volume
19
issue
25
pages
6101 - 6106
Web of Science type
Article
Web of Science id
000251422000010
JCR category
MATERIALS SCIENCE, MULTIDISCIPLINARY
JCR impact factor
4.883 (2007)
JCR rank
10/173 (2007)
JCR quartile
1 (2007)
ISSN
0897-4756
language
English
UGent publication?
yes
classification
A1
id
424688
handle
http://hdl.handle.net/1854/LU-424688
date created
2008-06-30 14:49:00
date last changed
2018-01-29 12:12:50
@article{424688,
  abstract     = {Inductively coupled plasma mass spectrometry (ICP-MS) was combined with UV-vis-NIR spectrophotometry and transmission electron microscopy to determine the nanocrystal composition and molar extinction coefficient epsilon of colloidal PbSe quantum dot (Q-PbSe) Suspensions. The ICP-MS results show a nonstoichiometric Pb/Se ratio, with a systematic excess of lead for all samples studied. The observed ratio is consistent with a faceted spherical Q-PbSe model, composed of a quasi stoichiometric Q-PbSe core terminated by a Ph surface shell. At high photon energies, we find that c scales with the nanocrystal volume, irrespective of the Q-PbSe size. From E, we calculated a size-independent absorption coefficient. Its value is in good agreement with the theoretical value for bulk PbSe. At the band gap, c is size-dependent. The resulting absorption coefficient increases quadratically with decreasing Q-PbSe size. Calculations of the oscillator strength of the first optical transition are in good agreement with theoretical tight binding calculations, showing that the oscillator strength increases linearly with Q-PbSe size.},
  author       = {Moreels, Iwan and Lambert, Karel and De Muynck, David and Vanhaecke, Frank and Poelman, Dirk and Martins, Jos{\'e} and ALLAN, G and Hens, Zeger},
  issn         = {0897-4756},
  journal      = {CHEMISTRY OF MATERIALS},
  keyword      = {ABSORPTION CROSS-SECTION,OPTICAL-PROPERTIES,NANOCRYSTALS,CDSE,CDTE},
  language     = {eng},
  number       = {25},
  pages        = {6101--6106},
  title        = {Composition and size-dependent extinction coefficient of colloidal PbSe quantum dots},
  volume       = {19},
  year         = {2007},
}

Chicago
Moreels, Iwan, Karel Lambert, David De Muynck, Frank Vanhaecke, Dirk Poelman, José Martins, G ALLAN, and Zeger Hens. 2007. “Composition and Size-dependent Extinction Coefficient of Colloidal PbSe Quantum Dots.” Chemistry of Materials 19 (25): 6101–6106.
APA
Moreels, I., Lambert, K., De Muynck, D., Vanhaecke, F., Poelman, D., Martins, J., ALLAN, G., et al. (2007). Composition and size-dependent extinction coefficient of colloidal PbSe quantum dots. CHEMISTRY OF MATERIALS, 19(25), 6101–6106.
Vancouver
1.
Moreels I, Lambert K, De Muynck D, Vanhaecke F, Poelman D, Martins J, et al. Composition and size-dependent extinction coefficient of colloidal PbSe quantum dots. CHEMISTRY OF MATERIALS. 2007;19(25):6101–6.
MLA
Moreels, Iwan, Karel Lambert, David De Muynck, et al. “Composition and Size-dependent Extinction Coefficient of Colloidal PbSe Quantum Dots.” CHEMISTRY OF MATERIALS 19.25 (2007): 6101–6106. Print.