Internal structure of InP/ZnS nanocrystals unraveled by high-resolution soft X-ray photoelectron spectroscopy

Kai Huang; Renaud Demadrille; Mathieu G. Silly; Fausto Sirotti; Peter Reiss; Olivier Renault

doi:10.1021/nn100581t

Internal structure of InP/ZnS nanocrystals unraveled by high-resolution soft X-ray photoelectron spectroscopy

Kai Huang, Renaud Demadrille, Mathieu G. Silly, Fausto Sirotti, Peter Reiss, Olivier Renault

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

Abstract

High-energy resolution photoelectron spectroscopy (ΔF < 200 meV) is used to investigate the internal structure of semiconductor quantum dots containing low Z-contrast elements. In InP/ZnS core/shell nanocrystals synthesized using a single-step procedure (core and shell precursors added at the same time), a homogeneously alloyed InPZnS core structure is evidenced by quantitative analysis of their In3d_5/2 spectra recorded at variable excitation energy. When using a two-step method (core InP nanocrystal synthesis followed by subsequent ZnS shell growth), XPS analysis reveals a graded core/shell interface. We demonstrate the existence of In-S and S _x-In-P_1-x bonding states in both types of InP/ZnS nanocrystals, which allows a refined view on the underlying reaction mechanisms.

Original language	English
Pages (from-to)	4799-4805
Number of pages	7
Journal	ACS Nano
Volume	4
Issue number	8
DOIs	https://doi.org/10.1021/nn100581t
Publication status	Published - 24 Aug 2010
Externally published	Yes

Keywords

Alloys
Core/shell structure
Indium phosphide
Nanocrystals
X-ray photoelectron spectroscopy

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10.1021/nn100581t

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title = "Internal structure of InP/ZnS nanocrystals unraveled by high-resolution soft X-ray photoelectron spectroscopy",

abstract = "High-energy resolution photoelectron spectroscopy (ΔF < 200 meV) is used to investigate the internal structure of semiconductor quantum dots containing low Z-contrast elements. In InP/ZnS core/shell nanocrystals synthesized using a single-step procedure (core and shell precursors added at the same time), a homogeneously alloyed InPZnS core structure is evidenced by quantitative analysis of their In3d5/2 spectra recorded at variable excitation energy. When using a two-step method (core InP nanocrystal synthesis followed by subsequent ZnS shell growth), XPS analysis reveals a graded core/shell interface. We demonstrate the existence of In-S and S x-In-P1-x bonding states in both types of InP/ZnS nanocrystals, which allows a refined view on the underlying reaction mechanisms.",

keywords = "Alloys, Core/shell structure, Indium phosphide, Nanocrystals, X-ray photoelectron spectroscopy",

author = "Kai Huang and Renaud Demadrille and Silly, \{Mathieu G.\} and Fausto Sirotti and Peter Reiss and Olivier Renault",

year = "2010",

month = aug,

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doi = "10.1021/nn100581t",

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T1 - Internal structure of InP/ZnS nanocrystals unraveled by high-resolution soft X-ray photoelectron spectroscopy

AU - Huang, Kai

AU - Demadrille, Renaud

AU - Silly, Mathieu G.

AU - Sirotti, Fausto

AU - Reiss, Peter

AU - Renault, Olivier

PY - 2010/8/24

Y1 - 2010/8/24

N2 - High-energy resolution photoelectron spectroscopy (ΔF < 200 meV) is used to investigate the internal structure of semiconductor quantum dots containing low Z-contrast elements. In InP/ZnS core/shell nanocrystals synthesized using a single-step procedure (core and shell precursors added at the same time), a homogeneously alloyed InPZnS core structure is evidenced by quantitative analysis of their In3d5/2 spectra recorded at variable excitation energy. When using a two-step method (core InP nanocrystal synthesis followed by subsequent ZnS shell growth), XPS analysis reveals a graded core/shell interface. We demonstrate the existence of In-S and S x-In-P1-x bonding states in both types of InP/ZnS nanocrystals, which allows a refined view on the underlying reaction mechanisms.

AB - High-energy resolution photoelectron spectroscopy (ΔF < 200 meV) is used to investigate the internal structure of semiconductor quantum dots containing low Z-contrast elements. In InP/ZnS core/shell nanocrystals synthesized using a single-step procedure (core and shell precursors added at the same time), a homogeneously alloyed InPZnS core structure is evidenced by quantitative analysis of their In3d5/2 spectra recorded at variable excitation energy. When using a two-step method (core InP nanocrystal synthesis followed by subsequent ZnS shell growth), XPS analysis reveals a graded core/shell interface. We demonstrate the existence of In-S and S x-In-P1-x bonding states in both types of InP/ZnS nanocrystals, which allows a refined view on the underlying reaction mechanisms.

KW - Alloys

KW - Core/shell structure

KW - Indium phosphide

KW - Nanocrystals

KW - X-ray photoelectron spectroscopy

U2 - 10.1021/nn100581t

DO - 10.1021/nn100581t

M3 - Article

AN - SCOPUS:78249260861

SN - 1936-0851

VL - 4

SP - 4799

EP - 4805

JO - ACS Nano

JF - ACS Nano

IS - 8

ER -

Internal structure of InP/ZnS nanocrystals unraveled by high-resolution soft X-ray photoelectron spectroscopy

Abstract

Keywords

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