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Cu_(2-x)S/PbS Core/Shell Nanocrystals with Improved Chemical Stability

Yee, Patrick Y. and Brittman, Sarah and Mahadik, Nadeemullah A. and Tischler, Joseph G. and Stroud, Rhonda M. and Efros, Alexander L. and Sercel, Peter C. and Boercker, Janice E. (2021) Cu_(2-x)S/PbS Core/Shell Nanocrystals with Improved Chemical Stability. Chemistry of Materials, 33 (17). pp. 6685-6691. ISSN 0897-4756. doi:10.1021/acs.chemmater.1c00769.

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Nanocrystals of doped semiconductors, such as Cu_(2-x)S, hold much promise for near infrared active devices because, unlike in noble metals, their tunable infrared plasmon can exist in nanocrystals with diameters <40 nm. Combining infrared plasmonic Cu_(2-x)S nanocrystals with infrared excitonic PbS nanocrystals has the potential to improve the optical properties of PbS nanocrystals via exciton–plasmon coupling. To explore this potential, we have developed the first synthetic method to deposit a PbS shell onto Cu_(2-x)S nanocrystals and confirmed the structure to have a mostly Cu_(2-x)S core with a patchy PbS shell using high-angle annular dark-field imaging scanning transmission electron microscopy and energy-dispersive X-ray spectroscopy spectrum images. Addition of the PbS shell changes the crystallographic phase of the Cu_(2-x)S cores and blueshifts and enhances their infrared plasmonic resonance. The shell also provides chemical stability to the Cu_(2-x)S nanocrystals such that they no longer completely chemically quench the photoluminescence of neighboring excitonic PbS nanocrystals in assembled films; consequently, these Cu_(2-x)S/PbS core/shell nanocrystals will enable future studies of infrared exciton–plasmon coupling at the nanoscale. This work demonstrates the importance of understanding the chemical interactions between nanocrystals of different materials when characterizing their optoelectronic properties in mixtures and composite materials.

Item Type:Article
Related URLs:
URLURL TypeDescription
Yee, Patrick Y.0000-0001-7915-1802
Brittman, Sarah0000-0002-7307-7565
Tischler, Joseph G.0000-0001-9517-0229
Stroud, Rhonda M.0000-0001-5242-8015
Efros, Alexander L.0000-0003-1938-553X
Sercel, Peter C.0000-0002-1734-3793
Boercker, Janice E.0000-0001-8776-6815
Alternate Title:Cu2-xS/PbS Core/Shell Nanocrystals with Improved Chemical Stability
Additional Information:© 2021 American Chemical Society. Received: March 2, 2021; Revised: August 4, 2021; Published: August 16, 2021. The Office of Naval Research (ONR) is gratefully acknowledged for their financial support of this work. P.Y.Y. acknowledges the National Research Council postdoctoral program. The authors declare no competing financial interest.
Funding AgencyGrant Number
Office of Naval Research (ONR)UNSPECIFIED
National Research CouncilUNSPECIFIED
Subject Keywords:Infrared light, Photoluminescence, Plasmons, Diffraction, Nanocrystals
Issue or Number:17
Record Number:CaltechAUTHORS:20210830-230029288
Persistent URL:
Official Citation:Cu2-xS/PbS Core/Shell Nanocrystals with Improved Chemical Stability. Patrick Y. Yee, Sarah Brittman, Nadeemullah A. Mahadik, Joseph G. Tischler, Rhonda M. Stroud, Alexander L. Efros, Peter C. Sercel, and Janice E. Boercker. Chemistry of Materials 2021 33 (17), 6685-6691; DOI: 10.1021/acs.chemmater.1c00769
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:110632
Deposited By: George Porter
Deposited On:31 Aug 2021 14:28
Last Modified:20 Sep 2021 18:35

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