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Colloidal Synthesis of Bulk-Bandgap Lead Selenide Nanocrystals

Lead selenide quantum dots (QDs) are low-bandgap IV-VI semiconducting nanomaterials that have been studied for a variety of applications. Their preparation using colloidal methods can create small spherical to larger cubic nanocrystals, with an upper limit of ~17 nm reported to date. Here we describ...

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Autores principales: Abeywickrama, Thulitha M., Hassan, Asra, Snee, Preston T.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6261983/
https://www.ncbi.nlm.nih.gov/pubmed/30525024
http://dx.doi.org/10.3389/fchem.2018.00562
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author Abeywickrama, Thulitha M.
Hassan, Asra
Snee, Preston T.
author_facet Abeywickrama, Thulitha M.
Hassan, Asra
Snee, Preston T.
author_sort Abeywickrama, Thulitha M.
collection PubMed
description Lead selenide quantum dots (QDs) are low-bandgap IV-VI semiconducting nanomaterials that have been studied for a variety of applications. Their preparation using colloidal methods can create small spherical to larger cubic nanocrystals, with an upper limit of ~17 nm reported to date. Here we describe methods for preparing cubic PbSe nanocrystals over a 20–40 nm size range using a twostep procedure. Specifically, ~10 nm PbSe QDs are generated using the rapid injection method, the products from which are overcoated with additional lead and selenium precursors. The use of two lead reagents were studied; lead oleate resulted in a maximum of 20 nm cubes, while more reactive lead hexyldecanoate resulted in much larger nanomaterials with bulk bandgaps. However, PbSe samples prepared with lead hexyldecanoate also contained agglomerates. Special care must be taken when characterizing larger strained nanomaterials with X-ray powder diffraction, for which the Scherrer equation is inadequate. A more rigorous approach using the Williamson–Hall method provides characterizations that are consistent with electron microscopy analysis.
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spelling pubmed-62619832018-12-06 Colloidal Synthesis of Bulk-Bandgap Lead Selenide Nanocrystals Abeywickrama, Thulitha M. Hassan, Asra Snee, Preston T. Front Chem Chemistry Lead selenide quantum dots (QDs) are low-bandgap IV-VI semiconducting nanomaterials that have been studied for a variety of applications. Their preparation using colloidal methods can create small spherical to larger cubic nanocrystals, with an upper limit of ~17 nm reported to date. Here we describe methods for preparing cubic PbSe nanocrystals over a 20–40 nm size range using a twostep procedure. Specifically, ~10 nm PbSe QDs are generated using the rapid injection method, the products from which are overcoated with additional lead and selenium precursors. The use of two lead reagents were studied; lead oleate resulted in a maximum of 20 nm cubes, while more reactive lead hexyldecanoate resulted in much larger nanomaterials with bulk bandgaps. However, PbSe samples prepared with lead hexyldecanoate also contained agglomerates. Special care must be taken when characterizing larger strained nanomaterials with X-ray powder diffraction, for which the Scherrer equation is inadequate. A more rigorous approach using the Williamson–Hall method provides characterizations that are consistent with electron microscopy analysis. Frontiers Media S.A. 2018-11-22 /pmc/articles/PMC6261983/ /pubmed/30525024 http://dx.doi.org/10.3389/fchem.2018.00562 Text en Copyright © 2018 Abeywickrama, Hassan and Snee. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Chemistry
Abeywickrama, Thulitha M.
Hassan, Asra
Snee, Preston T.
Colloidal Synthesis of Bulk-Bandgap Lead Selenide Nanocrystals
title Colloidal Synthesis of Bulk-Bandgap Lead Selenide Nanocrystals
title_full Colloidal Synthesis of Bulk-Bandgap Lead Selenide Nanocrystals
title_fullStr Colloidal Synthesis of Bulk-Bandgap Lead Selenide Nanocrystals
title_full_unstemmed Colloidal Synthesis of Bulk-Bandgap Lead Selenide Nanocrystals
title_short Colloidal Synthesis of Bulk-Bandgap Lead Selenide Nanocrystals
title_sort colloidal synthesis of bulk-bandgap lead selenide nanocrystals
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6261983/
https://www.ncbi.nlm.nih.gov/pubmed/30525024
http://dx.doi.org/10.3389/fchem.2018.00562
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