Extending the Spectral Range of Double-Heterojunction Nanorods by Cation Exchange-Induced Alloying

Joseph C. Flanagan, Logan P. Keating, Muttanagoud N. Kalasad, Moonsub Shim

Research output: Contribution to journalArticle

Abstract

Composition variation and formation of core/shell heterostructures have allowed the extension and applicability of size-tunable optical properties of colloidal semiconductor nanocrystals. Anisotropic shapes such as nanorods (NRs) provide new and further refined properties but relatively simple and empowering approaches such as alloying and controlled heterostructure formation are much more challenging to apply to these materials. Here, we start from a well-defined CdS/CdSe barbell-shaped NR heterostructure and perform sequential cation exchanges first with Cu and then with Cd/Zn under relatively mild conditions to achieve alloying while preserving the structure. By using a mixture of Cd and Zn in the presence of a thiol, controllable amounts of alloying in both components could be achieved. Growth of a final ZnSe shell enhances the photoluminescence and allows the creation of a series of double-heterojunction NRs with emission spanning the visible spectral range.

Original languageEnglish (US)
Pages (from-to)9307-9316
Number of pages10
JournalChemistry of Materials
Volume31
Issue number22
DOIs
StatePublished - Nov 26 2019

Fingerprint

Nanorods
Alloying
Heterojunctions
Cations
Ion exchange
Positive ions
Sulfhydryl Compounds
Nanocrystals
Photoluminescence
Optical properties
Semiconductor materials
Chemical analysis

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

Cite this

Extending the Spectral Range of Double-Heterojunction Nanorods by Cation Exchange-Induced Alloying. / Flanagan, Joseph C.; Keating, Logan P.; Kalasad, Muttanagoud N.; Shim, Moonsub.

In: Chemistry of Materials, Vol. 31, No. 22, 26.11.2019, p. 9307-9316.

Research output: Contribution to journalArticle

Flanagan, Joseph C. ; Keating, Logan P. ; Kalasad, Muttanagoud N. ; Shim, Moonsub. / Extending the Spectral Range of Double-Heterojunction Nanorods by Cation Exchange-Induced Alloying. In: Chemistry of Materials. 2019 ; Vol. 31, No. 22. pp. 9307-9316.
@article{7eca4f7213a04c57835f5ef4a1c368d2,
title = "Extending the Spectral Range of Double-Heterojunction Nanorods by Cation Exchange-Induced Alloying",
abstract = "Composition variation and formation of core/shell heterostructures have allowed the extension and applicability of size-tunable optical properties of colloidal semiconductor nanocrystals. Anisotropic shapes such as nanorods (NRs) provide new and further refined properties but relatively simple and empowering approaches such as alloying and controlled heterostructure formation are much more challenging to apply to these materials. Here, we start from a well-defined CdS/CdSe barbell-shaped NR heterostructure and perform sequential cation exchanges first with Cu and then with Cd/Zn under relatively mild conditions to achieve alloying while preserving the structure. By using a mixture of Cd and Zn in the presence of a thiol, controllable amounts of alloying in both components could be achieved. Growth of a final ZnSe shell enhances the photoluminescence and allows the creation of a series of double-heterojunction NRs with emission spanning the visible spectral range.",
author = "Flanagan, {Joseph C.} and Keating, {Logan P.} and Kalasad, {Muttanagoud N.} and Moonsub Shim",
year = "2019",
month = "11",
day = "26",
doi = "10.1021/acs.chemmater.9b02615",
language = "English (US)",
volume = "31",
pages = "9307--9316",
journal = "Chemistry of Materials",
issn = "0897-4756",
publisher = "American Chemical Society",
number = "22",

}

TY - JOUR

T1 - Extending the Spectral Range of Double-Heterojunction Nanorods by Cation Exchange-Induced Alloying

AU - Flanagan, Joseph C.

AU - Keating, Logan P.

AU - Kalasad, Muttanagoud N.

AU - Shim, Moonsub

PY - 2019/11/26

Y1 - 2019/11/26

N2 - Composition variation and formation of core/shell heterostructures have allowed the extension and applicability of size-tunable optical properties of colloidal semiconductor nanocrystals. Anisotropic shapes such as nanorods (NRs) provide new and further refined properties but relatively simple and empowering approaches such as alloying and controlled heterostructure formation are much more challenging to apply to these materials. Here, we start from a well-defined CdS/CdSe barbell-shaped NR heterostructure and perform sequential cation exchanges first with Cu and then with Cd/Zn under relatively mild conditions to achieve alloying while preserving the structure. By using a mixture of Cd and Zn in the presence of a thiol, controllable amounts of alloying in both components could be achieved. Growth of a final ZnSe shell enhances the photoluminescence and allows the creation of a series of double-heterojunction NRs with emission spanning the visible spectral range.

AB - Composition variation and formation of core/shell heterostructures have allowed the extension and applicability of size-tunable optical properties of colloidal semiconductor nanocrystals. Anisotropic shapes such as nanorods (NRs) provide new and further refined properties but relatively simple and empowering approaches such as alloying and controlled heterostructure formation are much more challenging to apply to these materials. Here, we start from a well-defined CdS/CdSe barbell-shaped NR heterostructure and perform sequential cation exchanges first with Cu and then with Cd/Zn under relatively mild conditions to achieve alloying while preserving the structure. By using a mixture of Cd and Zn in the presence of a thiol, controllable amounts of alloying in both components could be achieved. Growth of a final ZnSe shell enhances the photoluminescence and allows the creation of a series of double-heterojunction NRs with emission spanning the visible spectral range.

UR - http://www.scopus.com/inward/record.url?scp=85075149059&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85075149059&partnerID=8YFLogxK

U2 - 10.1021/acs.chemmater.9b02615

DO - 10.1021/acs.chemmater.9b02615

M3 - Article

AN - SCOPUS:85075149059

VL - 31

SP - 9307

EP - 9316

JO - Chemistry of Materials

JF - Chemistry of Materials

SN - 0897-4756

IS - 22

ER -