Charge separation in Pt-decorated CdSe@CdS octapod nanocrystals

Conca, E., Aresti, M., Saba, M., Casula, M.F., Quochi, F., Mula, G., Loche, D., Kim, M.R., Manna, L., Corrias, A., and others. (2014) Charge separation in Pt-decorated CdSe@CdS octapod nanocrystals. Nanoscale, 6 (4). pp. 2238-2243. ISSN 2040-3364. (doi:10.1039/c3nr05567a) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Official URL
http://dx.doi.org/10.1039/c3nr05567a

Abstract

We synthesize colloidal CdSe@CdS octapod nanocrystals decorated with Pt domains, resulting in a metal-semiconductor heterostructure. We devise a protocol to control the growth of Pt on the CdS surface, realizing both a selective tipping and a non-selective coverage. Ultrafast optical spectroscopy, particularly femtosecond transient absorption, is employed to correlate the dynamics of optical excitations with the nanocrystal morphology. We find two regimes for capture of photoexcited electrons by Pt domains: a slow capture after energy relaxation in the semiconductor, occurring in tipped nanocrystals and resulting in large spatial separation of charges, and an ultrafast capture of hot electrons occurring in nanocrystals covered in Pt, where charge separation happens faster than energy relaxation and Auger recombination. Besides the relevance for fundamental materials science and control at the nanoscale, our nanocrystals may be employed in solar photocatalysis. © 2014 The Royal Society of Chemistry.

Item Type: Article
DOI/Identification number: 10.1039/c3nr05567a
Uncontrolled keywords: Auger recombination, Charge separations, Femtosecond transient absorption, Metal semiconductors, Photoexcited electrons, Solar photocatalysis, Spatial separation, Ultrafast optical spectroscopy, Cadmium sulfide, Platinum, Separation, Nanocrystals, cadmium derivative, cadmium selenide, cadmium sulfide, nanoparticle, platinum, selenium derivative, sulfide, article, chemistry, semiconductor, Cadmium Compounds, Nanoparticles, Platinum, Selenium Compounds, Semiconductors, Sulfides
Subjects: Q Science > QC Physics > QC176.8.N35 Nanoscience, nanotechnology
Divisions: Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Anna Corrias
Date Deposited: 15 Dec 2014 17:08 UTC
Last Modified: 29 May 2019 13:56 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/46142 (The current URI for this page, for reference purposes)
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