Atomic Identification of Interfaces in Individual Core@shell Quantum Dots

Abstract CdSe@CdS Core@shell quantum dots (QDs) have been widely studied in recent years, due to their architecture which allows to tailor properties by controlling structure and composition. However, since CdSe and CdS have the same crystal structure, same cations, and similar lattice parameters, i...

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Autores principales:	Guiju Liu, Wenshuang Liang, Xuyan Xue, Federico Rosei, Yiqian Wang
Formato:	article
Lenguaje:	EN
Publicado:	Wiley 2021
Materias:	CdSe@CdS core@shell quantum dots crystal structure interfaces microstructures Science Q
Acceso en línea:	https://doaj.org/article/d394d63a1b294131960f603be4e07a14
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spelling	oai:doaj.org-article:d394d63a1b294131960f603be4e07a142021-11-17T08:40:31ZAtomic Identification of Interfaces in Individual Core@shell Quantum Dots2198-384410.1002/advs.202102784https://doaj.org/article/d394d63a1b294131960f603be4e07a142021-11-01T00:00:00Zhttps://doi.org/10.1002/advs.202102784https://doaj.org/toc/2198-3844Abstract CdSe@CdS Core@shell quantum dots (QDs) have been widely studied in recent years, due to their architecture which allows to tailor properties by controlling structure and composition. However, since CdSe and CdS have the same crystal structure, same cations, and similar lattice parameters, it is very challenging to image the interface. Herein, high‐resolution transmission electron microscopy, high‐angle annular dark‐field imaging, and energy‐dispersive X‐ray spectroscopy elemental mapping are combined to characterize the core@shell structure and identify the interface in the CdSe@CdS QDs with different CdS shell thicknesses. By examining changes in lattice spacing in an individual CdSe@CdS quantum dot, the atomic core@shell interface is identified. For thin‐shelled QDs, an ideal coherent interface forms between core and shell due to the small lattice mismatch, and the lattice spacing remains unchanged at the core and shell regions. For thick‐shelled QDs, the lattice spacing is different at the core and shell regions, while the heterostructured interface is still coherent and cannot be clearly imaged. As the shell thickness further increases, a sharp core@shell interface appears. The results define an approach to characterize the heterostructure of two materials with the same crystalline structure and cations.Guiju LiuWenshuang LiangXuyan XueFederico RoseiYiqian WangWileyarticleCdSe@CdS core@shell quantum dotscrystal structureinterfacesmicrostructuresScienceQENAdvanced Science, Vol 8, Iss 22, Pp n/a-n/a (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	CdSe@CdS core@shell quantum dots crystal structure interfaces microstructures Science Q
spellingShingle	CdSe@CdS core@shell quantum dots crystal structure interfaces microstructures Science Q Guiju Liu Wenshuang Liang Xuyan Xue Federico Rosei Yiqian Wang Atomic Identification of Interfaces in Individual Core@shell Quantum Dots
description	Abstract CdSe@CdS Core@shell quantum dots (QDs) have been widely studied in recent years, due to their architecture which allows to tailor properties by controlling structure and composition. However, since CdSe and CdS have the same crystal structure, same cations, and similar lattice parameters, it is very challenging to image the interface. Herein, high‐resolution transmission electron microscopy, high‐angle annular dark‐field imaging, and energy‐dispersive X‐ray spectroscopy elemental mapping are combined to characterize the core@shell structure and identify the interface in the CdSe@CdS QDs with different CdS shell thicknesses. By examining changes in lattice spacing in an individual CdSe@CdS quantum dot, the atomic core@shell interface is identified. For thin‐shelled QDs, an ideal coherent interface forms between core and shell due to the small lattice mismatch, and the lattice spacing remains unchanged at the core and shell regions. For thick‐shelled QDs, the lattice spacing is different at the core and shell regions, while the heterostructured interface is still coherent and cannot be clearly imaged. As the shell thickness further increases, a sharp core@shell interface appears. The results define an approach to characterize the heterostructure of two materials with the same crystalline structure and cations.
format	article
author	Guiju Liu Wenshuang Liang Xuyan Xue Federico Rosei Yiqian Wang
author_facet	Guiju Liu Wenshuang Liang Xuyan Xue Federico Rosei Yiqian Wang
author_sort	Guiju Liu
title	Atomic Identification of Interfaces in Individual Core@shell Quantum Dots
title_short	Atomic Identification of Interfaces in Individual Core@shell Quantum Dots
title_full	Atomic Identification of Interfaces in Individual Core@shell Quantum Dots
title_fullStr	Atomic Identification of Interfaces in Individual Core@shell Quantum Dots
title_full_unstemmed	Atomic Identification of Interfaces in Individual Core@shell Quantum Dots
title_sort	atomic identification of interfaces in individual core@shell quantum dots
publisher	Wiley
publishDate	2021
url	https://doaj.org/article/d394d63a1b294131960f603be4e07a14
work_keys_str_mv	AT guijuliu atomicidentificationofinterfacesinindividualcoreshellquantumdots AT wenshuangliang atomicidentificationofinterfacesinindividualcoreshellquantumdots AT xuyanxue atomicidentificationofinterfacesinindividualcoreshellquantumdots AT federicorosei atomicidentificationofinterfacesinindividualcoreshellquantumdots AT yiqianwang atomicidentificationofinterfacesinindividualcoreshellquantumdots
_version_	1718425702646153216

Atomic Identification of Interfaces in Individual Core@shell Quantum Dots

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