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Proceedings Paper

Synthesis and characterization of near-infrared PbSe/SnS colloidal core-shell quantum dots
Author(s): Arjun Senthil; Mark V. Reymatias; Gema J. Alas; Shruti I. Gharde; Rafael A. Castro; Adreanna G. Rael; DeYannah J. Walker; Nathan J. Withers; Gennady A. Smolyakov; Sergei A. Ivanov; Dale L. Huber; Marek Osiński
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Paper Abstract

Colloidal quantum dots (QDs) emitting in the near-infrared (NIR) spectrum are of interest for many biomedical applications, including bioimaging, biosensing, drug delivery, and photodynamic therapy. However, a significant limitation is that QDs are typically highly cytotoxic, containing materials such as indium arsenide (InAs), cadmium, or lead, which makes prospects for their FDA approval for human treatment very unlikely. Previous work on QDs in the NIR has focused on indium arsenide or cadmium chalcogenide cores coated with cadmium sulfide shells or zinc sulfide shells. Lead-based nanoparticles, such as lead selenide (PbSe) or lead sulfide (PbS) are also popular materials used for NIR emission. However, these nanoparticles have also been shown to be cytotoxic. Coating these Pb-based QDs with a biocompatible shell consisting of tin chalcogenides, such as tin sulfide (SnS) or tin selenide (TnSe), could be a reasonable alternative to improve their biocompatibility and reducing their cytotoxicity. In this paper, we report on our recent studies of PbSe-core QDs with Sn-containing shells, including synthesis, structural characterization, and investigation of optical properties. Characteristics of these QDs synthesized under different conditions are described. We conclude that their synthesis is challenging and still requires further work to avoid shell oxidation.

Paper Details

Date Published: 16 March 2020
PDF: 9 pages
Proc. SPIE 11255, Colloidal Nanoparticles for Biomedical Applications XV, 1125508 (16 March 2020); doi: 10.1117/12.2555079
Show Author Affiliations
Arjun Senthil, The Univ. of New Mexico (United States)
Mark V. Reymatias, The Univ. of New Mexico (United States)
Gema J. Alas, The Univ. of New Mexico (United States)
Shruti I. Gharde, The Univ. of New Mexico (United States)
Rafael A. Castro, The Univ. of New Mexico (United States)
Adreanna G. Rael, The Univ. of New Mexico (United States)
DeYannah J. Walker, The Univ. of New Mexico (United States)
Nathan J. Withers, The Univ. of New Mexico (United States)
Gennady A. Smolyakov, The Univ. of New Mexico (United States)
Sergei A. Ivanov, Los Alamos National Lab. (United States)
Dale L. Huber, Sandia National Labs. (United States)
Marek Osiński, The Univ. of New Mexico (United States)

Published in SPIE Proceedings Vol. 11255:
Colloidal Nanoparticles for Biomedical Applications XV
Marek Osiński; Antonios G. Kanaras, Editor(s)

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