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Tuning the postfocused size of colloidal nanocrystals by the reaction rate: from theory to application

Sofie Abé UGent, Richard Karel Capek, Bram De Geyter UGent and Zeger Hens UGent (2012) ACS NANO. 6(1). p.42-53
abstract
We show that adjusting the reaction rate in a hot injection synthesis is a viable strategy to tune the diameter of colloidal nanocrystals at the end of the size distribution focusing, i.e., the postfocused diameter. The approach is introduced by synthesis simulations, which describe nucleation and growth of colloidal nanocrystals from a solute or monomer that is formed in situ out of the Injected precursors. These simulations indicate that the postfocused diameter Is reached at almost full yield and that it can be adjusted by the rate of monomer formation. We implement this size-tuning strategy using a particular CdSe quantum dot synthesis that shows excellent agreement with the model synthesis. After demonstrating that the reaction rate depends in first order on the Cd and Se precursor concentration, the proposed strategy of size control is explored by varying the precursor concentration. This enables the synthesis of colloidal nanocrystals with a predefined size at almost full yield and sharp size distributions. In addition, we demonstrate that the same tuning strategy applies to the synthesis of CdS quantum dots. This result is highly relevant especially in the context of reaction upscaling and automation. Moreover, the results obtained challenge the traditional interpretation of the hot injection synthesis, in particular the link between hot Injection, burst nucleation, and sharp size distributions.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
QUANTUM DOTS, CDSE NANOCRYSTALS, II-VI, SEMICONDUCTOR NANOCRYSTALS, OPTICAL-PROPERTIES, INFRARED-EMISSION, INP NANOCRYSTALS, PARTICLE-SIZE, GROWTH, KINETICS, quantum dots, colloidal synthesis, reaction modeling, nucleation rate, postfocused size, size tuning, CdSe
journal title
ACS NANO
ACS Nano
volume
6
issue
1
pages
42 - 53
Web of Science type
Article
Web of Science id
000299368300007
JCR category
MATERIALS SCIENCE, MULTIDISCIPLINARY
JCR impact factor
12.062 (2012)
JCR rank
9/239 (2012)
JCR quartile
1 (2012)
ISSN
1936-0851
DOI
10.1021/nn204008q
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
2979511
handle
http://hdl.handle.net/1854/LU-2979511
date created
2012-09-05 17:38:38
date last changed
2014-05-26 09:47:06
@article{2979511,
  abstract     = {We show that adjusting the reaction rate in a hot injection synthesis is a viable strategy to tune the diameter of colloidal nanocrystals at the end of the size distribution focusing, i.e., the postfocused diameter. The approach is introduced by synthesis simulations, which describe nucleation and growth of colloidal nanocrystals from a solute or monomer that is formed in situ out of the Injected precursors. These simulations indicate that the postfocused diameter Is reached at almost full yield and that it can be adjusted by the rate of monomer formation. We implement this size-tuning strategy using a particular CdSe quantum dot synthesis that shows excellent agreement with the model synthesis. After demonstrating that the reaction rate depends in first order on the Cd and Se precursor concentration, the proposed strategy of size control is explored by varying the precursor concentration. This enables the synthesis of colloidal nanocrystals with a predefined size at almost full yield and sharp size distributions. In addition, we demonstrate that the same tuning strategy applies to the synthesis of CdS quantum dots. This result is highly relevant especially in the context of reaction upscaling and automation. Moreover, the results obtained challenge the traditional interpretation of the hot injection synthesis, in particular the link between hot Injection, burst nucleation, and sharp size distributions.},
  author       = {Ab{\'e}, Sofie and Capek, Richard Karel and De Geyter, Bram and Hens, Zeger},
  issn         = {1936-0851},
  journal      = {ACS NANO},
  keyword      = {QUANTUM DOTS,CDSE NANOCRYSTALS,II-VI,SEMICONDUCTOR NANOCRYSTALS,OPTICAL-PROPERTIES,INFRARED-EMISSION,INP NANOCRYSTALS,PARTICLE-SIZE,GROWTH,KINETICS,quantum dots,colloidal synthesis,reaction modeling,nucleation rate,postfocused size,size tuning,CdSe},
  language     = {eng},
  number       = {1},
  pages        = {42--53},
  title        = {Tuning the postfocused size of colloidal nanocrystals by the reaction rate: from theory to application},
  url          = {http://dx.doi.org/10.1021/nn204008q},
  volume       = {6},
  year         = {2012},
}

Chicago
Abé, Sofie, Richard Karel Capek, Bram De Geyter, and Zeger Hens. 2012. “Tuning the Postfocused Size of Colloidal Nanocrystals by the Reaction Rate: From Theory to Application.” Acs Nano 6 (1): 42–53.
APA
Abé, S., Capek, R. K., De Geyter, B., & Hens, Z. (2012). Tuning the postfocused size of colloidal nanocrystals by the reaction rate: from theory to application. ACS NANO, 6(1), 42–53.
Vancouver
1.
Abé S, Capek RK, De Geyter B, Hens Z. Tuning the postfocused size of colloidal nanocrystals by the reaction rate: from theory to application. ACS NANO. 2012;6(1):42–53.
MLA
Abé, Sofie, Richard Karel Capek, Bram De Geyter, et al. “Tuning the Postfocused Size of Colloidal Nanocrystals by the Reaction Rate: From Theory to Application.” ACS NANO 6.1 (2012): 42–53. Print.