Octapod-shaped colloidal nanocrystals of cadmium chalcogenides via "one-Pot" cation exchange and seeded growth

Sasanka Deka; Karol Miszta; Dirk Dorfs; Alessandro Genovese; Giovanni Bertoni; Liberato Manna

doi:10.1021/nl102539a

Octapod-shaped colloidal nanocrystals of cadmium chalcogenides via "one-Pot" cation exchange and seeded growth

Sasanka Deka, Karol Miszta, Dirk Dorfs, Alessandro Genovese, Giovanni Bertoni, Liberato Manna^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

169 Scopus citations

Abstract

The growth behavior of cadmium chalcogenides (CdE = CdS, CdSe, and CdTe) on sphalerite Cu_2-xSe nanocrystals (size range 10-15 nm) is studied. Due to the capability of Cu_2-xSe to undergo a fast and quantitative cation exchange reaction in the presence of excessive Cd²⁺ ions, no Cu_2-xSe/CdE heterostructures are obtained and instead branched CdSe/CdE nanocrystals are built which consist of a sphalerite CdSe core and wurtzite CdE arms. While CdTe growth yields multiarmed structures with overall tetrahedral symmetry, CdS and CdSe arm growth leads to octapod-shaped nanocrystals. These results differ significantly from literature findings about the growth of CdE on sphalerite CdSe particles, which until now had always yielded tetrapod-shaped nanocrystals.

Original language	English (US)
Pages (from-to)	3770-3776
Number of pages	7
Journal	Nano Letters
Volume	10
Issue number	9
DOIs	https://doi.org/10.1021/nl102539a
State	Published - Sep 8 2010
Externally published	Yes

Keywords

Quantum dot
heterostructure
multipod
octapod
semiconductor
tetrapod

ASJC Scopus subject areas

Bioengineering
General Chemistry
General Materials Science
Condensed Matter Physics
Mechanical Engineering

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10.1021/nl102539a

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abstract = "The growth behavior of cadmium chalcogenides (CdE = CdS, CdSe, and CdTe) on sphalerite Cu2-xSe nanocrystals (size range 10-15 nm) is studied. Due to the capability of Cu2-xSe to undergo a fast and quantitative cation exchange reaction in the presence of excessive Cd2+ ions, no Cu2-xSe/CdE heterostructures are obtained and instead branched CdSe/CdE nanocrystals are built which consist of a sphalerite CdSe core and wurtzite CdE arms. While CdTe growth yields multiarmed structures with overall tetrahedral symmetry, CdS and CdSe arm growth leads to octapod-shaped nanocrystals. These results differ significantly from literature findings about the growth of CdE on sphalerite CdSe particles, which until now had always yielded tetrapod-shaped nanocrystals.",

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T1 - Octapod-shaped colloidal nanocrystals of cadmium chalcogenides via "one-Pot" cation exchange and seeded growth

AU - Deka, Sasanka

AU - Miszta, Karol

AU - Dorfs, Dirk

AU - Genovese, Alessandro

AU - Bertoni, Giovanni

AU - Manna, Liberato

PY - 2010/9/8

Y1 - 2010/9/8

N2 - The growth behavior of cadmium chalcogenides (CdE = CdS, CdSe, and CdTe) on sphalerite Cu2-xSe nanocrystals (size range 10-15 nm) is studied. Due to the capability of Cu2-xSe to undergo a fast and quantitative cation exchange reaction in the presence of excessive Cd2+ ions, no Cu2-xSe/CdE heterostructures are obtained and instead branched CdSe/CdE nanocrystals are built which consist of a sphalerite CdSe core and wurtzite CdE arms. While CdTe growth yields multiarmed structures with overall tetrahedral symmetry, CdS and CdSe arm growth leads to octapod-shaped nanocrystals. These results differ significantly from literature findings about the growth of CdE on sphalerite CdSe particles, which until now had always yielded tetrapod-shaped nanocrystals.

AB - The growth behavior of cadmium chalcogenides (CdE = CdS, CdSe, and CdTe) on sphalerite Cu2-xSe nanocrystals (size range 10-15 nm) is studied. Due to the capability of Cu2-xSe to undergo a fast and quantitative cation exchange reaction in the presence of excessive Cd2+ ions, no Cu2-xSe/CdE heterostructures are obtained and instead branched CdSe/CdE nanocrystals are built which consist of a sphalerite CdSe core and wurtzite CdE arms. While CdTe growth yields multiarmed structures with overall tetrahedral symmetry, CdS and CdSe arm growth leads to octapod-shaped nanocrystals. These results differ significantly from literature findings about the growth of CdE on sphalerite CdSe particles, which until now had always yielded tetrapod-shaped nanocrystals.

KW - Quantum dot

KW - heterostructure

KW - multipod

KW - octapod

KW - semiconductor

KW - tetrapod

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Octapod-shaped colloidal nanocrystals of cadmium chalcogenides via "one-Pot" cation exchange and seeded growth

Abstract

Keywords

ASJC Scopus subject areas

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