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Insights into the Structure of Dot@Rod and Dot@Octapod CdSe@CdS Heterostructures

Corrias, Anna, Conca, Erika, Cibin, Giannantonio, Mountjoy, Gavin, Gianolio, Diego, De Donato, Francesco, Manna, Liberato, Casula, Maria Francesca (2015) Insights into the Structure of Dot@Rod and Dot@Octapod CdSe@CdS Heterostructures. Journal of Physical Chemistry C, 119 (28). pp. 16338-16348. ISSN 1932-7447. E-ISSN 1932-7455. (doi:10.1021/acs.jpcc.5b04593) (KAR id:49605)

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Abstract

CdSe@CdS dot@rods with diameter around 6 nm and length of either

20, 27, or 30 nm and dot@octapods with pod diameters of ?15 nm and lengths of ?50

nm were investigated by X-ray absorption spectroscopy. These heterostructures are

prepared by seed-mediated routes, where the structure, composition, and morphology of

the CdSe nanocrystals used as a seed play key roles in directing the growth of the second

semiconducting domain. The local structural environment of all the elements in the

CdSe@CdS heterostructures was investigated at the Cd, S, and Se K-edges by taking

advantage of the selectivity of X-ray absorption spectroscopy, and was compared to pure

reference compounds. We found that the structural features of dot@rods are

independent of the size of the rods. These structures can be described as made of a

CdSe dot and a CdS rod, both in the wurtzite phase with a high crystallinity of both the

core and the rod. This result supports the effectiveness of high temperature colloidal

synthesis in promoting the formation of core@shell nanocrystals with very low

defectivity. On the other hand, data on the CdSe@CdS with octapod morphology suggest the occurrence of a core composed of

a CdSe cubic sphalerite phase with eight pods made of CdS wurtzite phase. Our findings are compared to current models

proposed for the design of functional heterostructures with controlled nanoarchitecture.

Item Type: Article
DOI/Identification number: 10.1021/acs.jpcc.5b04593
Subjects: Q Science > QD Chemistry
Divisions: Divisions > Division of Natural Sciences > Physics and Astronomy
Depositing User: Anna Corrias
Date Deposited: 20 Jul 2015 13:01 UTC
Last Modified: 09 Dec 2022 05:47 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/49605 (The current URI for this page, for reference purposes)

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