Phase transformations in CdSe quantum dots induced by reaction time

Fehmida K. Kanodarwala; Fan Wang; Peter J. Reece; John A. Stride

doi:10.1016/j.matlet.2014.11.043

Phase transformations in CdSe quantum dots induced by reaction time

Fehmida K. Kanodarwala^*, Fan Wang, Peter J. Reece, John A. Stride

^*Corresponding author for this work

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

1 Citation (Scopus)

Abstract

This paper reports the synthesis of high-quality TOP/TOPO capped CdSe nanocrystals using a simple colloidal method. The effects of varying the reaction time on the size and crystallinity of the synthesized CdSe quantum dots were studied in detail. Powder X-ray diffraction (PXRD) analysis showed a dependence of the crystallite phases as a function of reaction time, from cubic zinc-blende to hexagonal wurtzite and back again to the cubic phase. PXRD data was found to be consistent with high resolution transmission electron microscopy (HRTEM) images of the particles, whilst optical spectroscopy demonstrated the quantum dot nature of the particles. The reaction time-dependent phase behavior is best accounted for by rapid growth along the {111} crystallite facets, after which the facial facets then 'catch-up', resulting once again in cubic symmetry.

Original language	English
Pages (from-to)	67-69
Number of pages	3
Journal	Materials Letters
Volume	141
DOIs	https://doi.org/10.1016/j.matlet.2014.11.043
Publication status	Published - 15 Feb 2015

Keywords

Phase transition
Quantum dots
Reaction time

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10.1016/j.matlet.2014.11.043

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title = "Phase transformations in CdSe quantum dots induced by reaction time",

abstract = "This paper reports the synthesis of high-quality TOP/TOPO capped CdSe nanocrystals using a simple colloidal method. The effects of varying the reaction time on the size and crystallinity of the synthesized CdSe quantum dots were studied in detail. Powder X-ray diffraction (PXRD) analysis showed a dependence of the crystallite phases as a function of reaction time, from cubic zinc-blende to hexagonal wurtzite and back again to the cubic phase. PXRD data was found to be consistent with high resolution transmission electron microscopy (HRTEM) images of the particles, whilst optical spectroscopy demonstrated the quantum dot nature of the particles. The reaction time-dependent phase behavior is best accounted for by rapid growth along the {111} crystallite facets, after which the facial facets then 'catch-up', resulting once again in cubic symmetry.",

keywords = "Phase transition, Quantum dots, Reaction time",

author = "Kanodarwala, {Fehmida K.} and Fan Wang and Reece, {Peter J.} and Stride, {John A.}",

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T1 - Phase transformations in CdSe quantum dots induced by reaction time

AU - Kanodarwala, Fehmida K.

AU - Wang, Fan

AU - Reece, Peter J.

AU - Stride, John A.

PY - 2015/2/15

Y1 - 2015/2/15

N2 - This paper reports the synthesis of high-quality TOP/TOPO capped CdSe nanocrystals using a simple colloidal method. The effects of varying the reaction time on the size and crystallinity of the synthesized CdSe quantum dots were studied in detail. Powder X-ray diffraction (PXRD) analysis showed a dependence of the crystallite phases as a function of reaction time, from cubic zinc-blende to hexagonal wurtzite and back again to the cubic phase. PXRD data was found to be consistent with high resolution transmission electron microscopy (HRTEM) images of the particles, whilst optical spectroscopy demonstrated the quantum dot nature of the particles. The reaction time-dependent phase behavior is best accounted for by rapid growth along the {111} crystallite facets, after which the facial facets then 'catch-up', resulting once again in cubic symmetry.

AB - This paper reports the synthesis of high-quality TOP/TOPO capped CdSe nanocrystals using a simple colloidal method. The effects of varying the reaction time on the size and crystallinity of the synthesized CdSe quantum dots were studied in detail. Powder X-ray diffraction (PXRD) analysis showed a dependence of the crystallite phases as a function of reaction time, from cubic zinc-blende to hexagonal wurtzite and back again to the cubic phase. PXRD data was found to be consistent with high resolution transmission electron microscopy (HRTEM) images of the particles, whilst optical spectroscopy demonstrated the quantum dot nature of the particles. The reaction time-dependent phase behavior is best accounted for by rapid growth along the {111} crystallite facets, after which the facial facets then 'catch-up', resulting once again in cubic symmetry.

KW - Phase transition

KW - Quantum dots

KW - Reaction time

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U2 - 10.1016/j.matlet.2014.11.043

DO - 10.1016/j.matlet.2014.11.043

M3 - Article

VL - 141

SP - 67

EP - 69

JO - Materials Letters

JF - Materials Letters

SN - 0167-577X

ER -

Phase transformations in CdSe quantum dots induced by reaction time

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Keywords

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