Bertoni, G, Ramasse, Q orcid.org/0000-0001-7466-2283, Brescia, R et al. (3 more authors) (2019) Direct Quantification of Cu Vacancies and Spatial Localization of Surface Plasmon Resonances in Copper Phosphide Nanocrystals. ACS Materials Letters, 1 (6). pp. 665-670. ISSN 2639-4979
Abstract
Copper chalcogenides and pnictogenides often behave as heavily doped p-type semiconductors, because of the presence of a high density of Cu vacancies, with corresponding hole carriers in the valence band. If the free-carrier concentration is high enough, localized surface plasmon resonances can be sustained in nanocrystals of these materials, with frequencies that are typically observed in the infrared region of the spectrum (<1 eV), differently from the typical resonances featured in the visible range by metallic nanoparticles. Here, we demonstrate that Cu vacancies in hexagonal Cu3–xP nanocrystals can be directly quantified by scanning transmission electron microscopy (STEM) analysis. We also report, for the first time, the spatial localization of the plasmon resonances in individual Cu3–xP nanocrystals by means of STEM energy loss spectroscopy (EELS), which is an achievement that, to date, had been possible only on nanoparticles of noble metals. Two plasmon modes can be seen from STEM-EELS, which are in agreement with the resonances calculated from the vacancy concentration obtained from the STEM analysis.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2019 American Chemical Society. This is an author produced version of a published in ACS Materials Letters. Uploaded in accordance with the publisher's self-archiving policy. |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 10 Feb 2020 16:04 |
Last Modified: | 07 Nov 2020 01:39 |
Status: | Published |
Publisher: | American Chemical Society (ACS) |
Identification Number: | 10.1021/acsmaterialslett.9b00412 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:156697 |