Optical and surface characterisation of capping ligands in the preparation of InP/ZnS quantum dots

Shu Xu, Frederik Klama, Henrietta Ueckermann, Jurian Hoogewerff, Nigel Clayden, Thomas Nann

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The chemical and physical properties of semiconductor nanocrystals are highly dependent on the surface capping environment. Our synthetic study on InP nanocrystals indicated that the zinc carboxylate salts influence the growth of InP nanocrystals and passivate their surface by removing the surface defects. In this, we study the capping environment of InP nanocrystals by solid-state NMR and IR characterisation. The influence of the concentration of different ligands on the PL wavelength and intensity was exaqmined to investigate the growth and surface passivation mechanisms. The study indicated a weak interaction between the exposed atoms on InP nanocrystal surfaces and the capping molecules, especially zinc carboxylates. The surface passivation prevented the InP nanocrystals from forming dangling bonds and thus reducing surface quenching and leading to improved quantum yields. The presence of zinc carboxylates is also believed to contribute to the slow crystal growth and reduced size distribution of as-prepared InP nanocrystals.

Original languageEnglish
Pages (from-to)125-137
Number of pages13
JournalScience of Advanced Materials
Volume1
Issue number2
DOIs
Publication statusPublished - 1 Aug 2009
Externally publishedYes

Fingerprint

Nanocrystals
Semiconductor quantum dots
Ligands
Zinc
Passivation
Dangling bonds
Surface defects
Beam plasma interactions
Quantum yield
Crystallization
Crystal growth
Chemical properties
Quenching
Physical properties
Salts
Nuclear magnetic resonance
Semiconductor materials
Wavelength
Atoms
Molecules

Cite this

Xu, Shu ; Klama, Frederik ; Ueckermann, Henrietta ; Hoogewerff, Jurian ; Clayden, Nigel ; Nann, Thomas. / Optical and surface characterisation of capping ligands in the preparation of InP/ZnS quantum dots. In: Science of Advanced Materials. 2009 ; Vol. 1, No. 2. pp. 125-137.
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abstract = "The chemical and physical properties of semiconductor nanocrystals are highly dependent on the surface capping environment. Our synthetic study on InP nanocrystals indicated that the zinc carboxylate salts influence the growth of InP nanocrystals and passivate their surface by removing the surface defects. In this, we study the capping environment of InP nanocrystals by solid-state NMR and IR characterisation. The influence of the concentration of different ligands on the PL wavelength and intensity was exaqmined to investigate the growth and surface passivation mechanisms. The study indicated a weak interaction between the exposed atoms on InP nanocrystal surfaces and the capping molecules, especially zinc carboxylates. The surface passivation prevented the InP nanocrystals from forming dangling bonds and thus reducing surface quenching and leading to improved quantum yields. The presence of zinc carboxylates is also believed to contribute to the slow crystal growth and reduced size distribution of as-prepared InP nanocrystals.",
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Optical and surface characterisation of capping ligands in the preparation of InP/ZnS quantum dots. / Xu, Shu; Klama, Frederik; Ueckermann, Henrietta; Hoogewerff, Jurian; Clayden, Nigel; Nann, Thomas.

In: Science of Advanced Materials, Vol. 1, No. 2, 01.08.2009, p. 125-137.

Research output: Contribution to journalArticle

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T1 - Optical and surface characterisation of capping ligands in the preparation of InP/ZnS quantum dots

AU - Xu, Shu

AU - Klama, Frederik

AU - Ueckermann, Henrietta

AU - Hoogewerff, Jurian

AU - Clayden, Nigel

AU - Nann, Thomas

PY - 2009/8/1

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AB - The chemical and physical properties of semiconductor nanocrystals are highly dependent on the surface capping environment. Our synthetic study on InP nanocrystals indicated that the zinc carboxylate salts influence the growth of InP nanocrystals and passivate their surface by removing the surface defects. In this, we study the capping environment of InP nanocrystals by solid-state NMR and IR characterisation. The influence of the concentration of different ligands on the PL wavelength and intensity was exaqmined to investigate the growth and surface passivation mechanisms. The study indicated a weak interaction between the exposed atoms on InP nanocrystal surfaces and the capping molecules, especially zinc carboxylates. The surface passivation prevented the InP nanocrystals from forming dangling bonds and thus reducing surface quenching and leading to improved quantum yields. The presence of zinc carboxylates is also believed to contribute to the slow crystal growth and reduced size distribution of as-prepared InP nanocrystals.

KW - Colloids

KW - InP

KW - Ligands

KW - Quantum dots

KW - Synthesis methods

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