Synthesis and surface modification of PbSe/PbS core-shell nanocrystals for potential device applications

Jian Xu, Dehu Cui, Ting Zhu, Gary Paradee, Ziqi Liang, Qing Wang, Shengyong Xu, Andrew Y. Wang

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

We report in this paper the growth of PbS shells over colloidal PbSe nanocrystal quantum dots (NQDs) with monolayer-precision. The technique of successive ion layer adsorption and reaction (SILAR) has been adapted to the growth of high-quality core-shell nanocrystals. The core-shell infrared NQDs were ligand-exchanged with short-chain octylamine, and the photoluminescence efficiency of the surface-engineered core-shell nanoparticles was substantially higher than that of the plain core structures undergoing the same surface processing, which reveals less ligand dependence and enhanced chemical robustness in the core-shell NQDs. The reported results open up the possibility of incorporating semiconductor infrared NQDs in the silicon matrix to develop all-inorganic light-emitting heterojunctions on silicon substrates.

Original languageEnglish (US)
Article number024
Pages (from-to)5428-5434
Number of pages7
JournalNanotechnology
Volume17
Issue number21
DOIs
StatePublished - Nov 14 2006

Fingerprint

Nanocrystals
Surface treatment
Semiconductor quantum dots
Silicon
Ligands
Infrared radiation
Heterojunctions
Monolayers
Photoluminescence
lead selenide
Ions
Semiconductor materials
Nanoparticles
Adsorption
Substrates
Processing

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering

Cite this

Xu, Jian ; Cui, Dehu ; Zhu, Ting ; Paradee, Gary ; Liang, Ziqi ; Wang, Qing ; Xu, Shengyong ; Wang, Andrew Y. / Synthesis and surface modification of PbSe/PbS core-shell nanocrystals for potential device applications. In: Nanotechnology. 2006 ; Vol. 17, No. 21. pp. 5428-5434.
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Synthesis and surface modification of PbSe/PbS core-shell nanocrystals for potential device applications. / Xu, Jian; Cui, Dehu; Zhu, Ting; Paradee, Gary; Liang, Ziqi; Wang, Qing; Xu, Shengyong; Wang, Andrew Y.

In: Nanotechnology, Vol. 17, No. 21, 024, 14.11.2006, p. 5428-5434.

Research output: Contribution to journalArticle

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T1 - Synthesis and surface modification of PbSe/PbS core-shell nanocrystals for potential device applications

AU - Xu, Jian

AU - Cui, Dehu

AU - Zhu, Ting

AU - Paradee, Gary

AU - Liang, Ziqi

AU - Wang, Qing

AU - Xu, Shengyong

AU - Wang, Andrew Y.

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AB - We report in this paper the growth of PbS shells over colloidal PbSe nanocrystal quantum dots (NQDs) with monolayer-precision. The technique of successive ion layer adsorption and reaction (SILAR) has been adapted to the growth of high-quality core-shell nanocrystals. The core-shell infrared NQDs were ligand-exchanged with short-chain octylamine, and the photoluminescence efficiency of the surface-engineered core-shell nanoparticles was substantially higher than that of the plain core structures undergoing the same surface processing, which reveals less ligand dependence and enhanced chemical robustness in the core-shell NQDs. The reported results open up the possibility of incorporating semiconductor infrared NQDs in the silicon matrix to develop all-inorganic light-emitting heterojunctions on silicon substrates.

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