Method To Incorporate Anisotropic Semiconductor Nanocrystals
of All Shapes in an Ultrathin and Uniform Silica Shell
Posted on 2014-03-11 - 00:00
In this work, we present a method
for the incorporation of anisotropic
colloidal nanocrystals of many different shapes in silica in a highly
controlled way. This method yields a uniform silica shell, with thickness
tunable from 3 to 17 nm. The silica shell perfectly adapts to the
shape of the nanocrystals, preserving their anisotropy, a crucial
requisite for shape-dependent applications. Our method is based on
an adaptation of the reverse microemulsion method. High control over
the nucleation and growth of the shell is obtained by slowing down
the hydrolysis and condensation rates of the silica precursor by lowering
the ammonia concentration. This is shown to be essential for the formation
of a uniform silica shell in the case of CdSe/CdS core/shell nanorods.
Additionally, the general applicability of this method is demonstrated
by coating different anisotropic semiconductor nanocrystals such as
nanostars and 2D nanoplatelets. These results thus represent a crucial
step toward the fabrication of highly processable and functionalized
anisotropic nanoparticles.
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Hutter, Eline
M.; Pietra, Francesca; A. van Dijk - Moes, Relinde
J.; Mitoraj, Dariusz; Meeldijk, Johannes D.; de Mello Donegá, Celso; et al. (2016). Method To Incorporate Anisotropic Semiconductor Nanocrystals
of All Shapes in an Ultrathin and Uniform Silica Shell. ACS Publications. Collection. https://doi.org/10.1021/cm404122f
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AUTHORS (7)
EH
Eline
M. Hutter
FP
Francesca Pietra
RA
Relinde
J. A. van Dijk - Moes
DM
Dariusz Mitoraj
JM
Johannes D. Meeldijk
Cd
Celso de Mello Donegá
DV
Daniël Vanmaekelbergh
KEYWORDS
anisotropic semiconductor nanocrystalscondensation ratesmethod yieldsHigh controlsilica shell17 nmthickness tunable2 D nanoplateletsfunctionalized anisotropic nanoparticlesuniform silica shellUniform Silica ShellInmicroemulsion methodsilica precursorIncorporate Anisotropic Semiconductor Nanocrystalsammonia concentration