Journal of Physical Chemistry C, volume 117, issue 10, pages 5424-5428
Size-Dependent Extinction Coefficients and Transition Energies of Near-Infrared β-Ag2Se Colloidal Quantum Dots
1
Centre d’Optique,
Photonique
et Laser (COPL), Département de Physique, de Génie Physique et d’Optique, Université Laval, 2375 Rue de la Terrasse, Québec (Qc),
Canada, G1V 0A6.
|
2
Centre de
Recherche sur les Matériaux
Avancés, Département de Chimie, Université Laval, 1045 Avenue
de la Médecine, Québec (Qc), Canada, G1V 0A6.
|
Publication type: Journal Article
Publication date: 2013-03-01
Journal:
Journal of Physical Chemistry C
Quartile SCImago
Q1
Quartile WOS
Q2
Impact factor: 3.7
ISSN: 19327447, 19327455
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
Physical and Theoretical Chemistry
General Energy
Abstract
Our investigations of silver selenide colloidal quantum dots, emitting in the biologically important near-infrared region, demonstrate the size-dependence of their optical properties. Ag2Se nanocrystals were prepared in the orthorhombic phase with their average radius varying from 0.95 to 4.7 nm as observed by transmission electron microscopy. The high purity of the samples, established by energy-dispersive X-ray spectroscopy and X-ray diffraction, allowed for the accurate determination of the Ag2Se content of colloidal suspensions by a thermogravimetric method. The energy of the first observed transition is found to decrease asymptotically with colloidal quantum dot size, tending toward a value of 1.1 eV, a value significantly above the β-Ag2Se bulk bandgap. Furthermore, the molar extinction coefficient of this absorption is proportional to r02.7±0.2, where r0 is the cQD radius. At higher energies, the extinction coefficient eventually follows the classically predicted cubic power law with r0.
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Langevin M. A. et al. Size-Dependent Extinction Coefficients and Transition Energies of Near-Infrared β-Ag2Se Colloidal Quantum Dots // Journal of Physical Chemistry C. 2013. Vol. 117. No. 10. pp. 5424-5428.
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Langevin M. A., Lachance-Quirion D., Ritcey A. M., Nì. Allen C. Size-Dependent Extinction Coefficients and Transition Energies of Near-Infrared β-Ag2Se Colloidal Quantum Dots // Journal of Physical Chemistry C. 2013. Vol. 117. No. 10. pp. 5424-5428.
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TY - JOUR
DO - 10.1021/jp311206e
UR - https://doi.org/10.1021/jp311206e
TI - Size-Dependent Extinction Coefficients and Transition Energies of Near-Infrared β-Ag2Se Colloidal Quantum Dots
T2 - Journal of Physical Chemistry C
AU - Langevin, Marc Antoine
AU - Lachance-Quirion, Dany
AU - Ritcey, Anna M.
AU - Nì. Allen, Claudine
PY - 2013
DA - 2013/03/01 00:00:00
PB - American Chemical Society (ACS)
SP - 5424-5428
IS - 10
VL - 117
SN - 1932-7447
SN - 1932-7455
ER -
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@article{2013_Langevin,
author = {Marc Antoine Langevin and Dany Lachance-Quirion and Anna M. Ritcey and Claudine Nì. Allen},
title = {Size-Dependent Extinction Coefficients and Transition Energies of Near-Infrared β-Ag2Se Colloidal Quantum Dots},
journal = {Journal of Physical Chemistry C},
year = {2013},
volume = {117},
publisher = {American Chemical Society (ACS)},
month = {mar},
url = {https://doi.org/10.1021/jp311206e},
number = {10},
pages = {5424--5428},
doi = {10.1021/jp311206e}
}
Cite this
MLA
Copy
Langevin, Marc Antoine, et al. “Size-Dependent Extinction Coefficients and Transition Energies of Near-Infrared β-Ag2Se Colloidal Quantum Dots.” Journal of Physical Chemistry C, vol. 117, no. 10, Mar. 2013, pp. 5424-5428. https://doi.org/10.1021/jp311206e.