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Single-Crystalline Germanium Nanocrystals via a Two-Step Microwave-Assisted Colloidal Synthesis from GeI(4)
[Image: see text] Colloidal germanium (Ge) nanocrystals (NCs) are of great interest with possible applications for photovoltaics and near-IR detectors. In many examples of colloidal reactions, Ge(II) precursors are employed, and NCs of diameter ∼3–10 nm have been prepared. Herein, we employed a two-...
Autores principales: | , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical Society
2022
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9888621/ https://www.ncbi.nlm.nih.gov/pubmed/36855386 http://dx.doi.org/10.1021/acsmaterialsau.1c00072 |
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author | Ju, Zheng Qi, Xiao Sfadia, Roy Wang, Minyuan Tseng, Emily Panchul, Elizabeth C. Carter, Sue A. Kauzlarich, Susan M. |
author_facet | Ju, Zheng Qi, Xiao Sfadia, Roy Wang, Minyuan Tseng, Emily Panchul, Elizabeth C. Carter, Sue A. Kauzlarich, Susan M. |
author_sort | Ju, Zheng |
collection | PubMed |
description | [Image: see text] Colloidal germanium (Ge) nanocrystals (NCs) are of great interest with possible applications for photovoltaics and near-IR detectors. In many examples of colloidal reactions, Ge(II) precursors are employed, and NCs of diameter ∼3–10 nm have been prepared. Herein, we employed a two-step microwave-assisted reduction of GeI(4) in oleylamine (OAm) to prepare monodispersed Ge NCs with a size of 18.9 ± 1.84 nm. More importantly, the as-synthesized Ge NCs showed high crystallinity with single-crystal nature as indicated by powder X-ray diffraction, selected area electron diffraction, and high-resolution transmission electron microscopy. The Tauc plot derived from photothermal deflection spectroscopy measurement on Ge NCs thin films shows a decreased bandgap of the Ge NCs obtained from GeI(4) compared with that of the Ge NCs from GeI(2) with a similar particle size, indicating a higher crystallinity of the samples prepared with the two-step reaction from GeI(4). The calculated Urbach energy indicates less disorder in the larger NCs. This disorder might correlate with the fraction of surface states associated with decreased particle size or with the increased molar ratio of ligands to germanium. Solutions involved in this two-step reaction were investigated with (1)H NMR spectroscopy and high-resolution mass spectrometry (MS). One possible reaction pathway is proposed to unveil the details of the reaction involving GeI(4) and OAm. Overall, this two-step synthesis produces high-quality Ge NCs and provides new insight on nanoparticle synthesis of covalently bonding semiconductors. |
format | Online Article Text |
id | pubmed-9888621 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | American Chemical Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-98886212023-02-27 Single-Crystalline Germanium Nanocrystals via a Two-Step Microwave-Assisted Colloidal Synthesis from GeI(4) Ju, Zheng Qi, Xiao Sfadia, Roy Wang, Minyuan Tseng, Emily Panchul, Elizabeth C. Carter, Sue A. Kauzlarich, Susan M. ACS Mater Au [Image: see text] Colloidal germanium (Ge) nanocrystals (NCs) are of great interest with possible applications for photovoltaics and near-IR detectors. In many examples of colloidal reactions, Ge(II) precursors are employed, and NCs of diameter ∼3–10 nm have been prepared. Herein, we employed a two-step microwave-assisted reduction of GeI(4) in oleylamine (OAm) to prepare monodispersed Ge NCs with a size of 18.9 ± 1.84 nm. More importantly, the as-synthesized Ge NCs showed high crystallinity with single-crystal nature as indicated by powder X-ray diffraction, selected area electron diffraction, and high-resolution transmission electron microscopy. The Tauc plot derived from photothermal deflection spectroscopy measurement on Ge NCs thin films shows a decreased bandgap of the Ge NCs obtained from GeI(4) compared with that of the Ge NCs from GeI(2) with a similar particle size, indicating a higher crystallinity of the samples prepared with the two-step reaction from GeI(4). The calculated Urbach energy indicates less disorder in the larger NCs. This disorder might correlate with the fraction of surface states associated with decreased particle size or with the increased molar ratio of ligands to germanium. Solutions involved in this two-step reaction were investigated with (1)H NMR spectroscopy and high-resolution mass spectrometry (MS). One possible reaction pathway is proposed to unveil the details of the reaction involving GeI(4) and OAm. Overall, this two-step synthesis produces high-quality Ge NCs and provides new insight on nanoparticle synthesis of covalently bonding semiconductors. American Chemical Society 2022-02-08 /pmc/articles/PMC9888621/ /pubmed/36855386 http://dx.doi.org/10.1021/acsmaterialsau.1c00072 Text en © 2022 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by-nc-nd/4.0/Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/). |
spellingShingle | Ju, Zheng Qi, Xiao Sfadia, Roy Wang, Minyuan Tseng, Emily Panchul, Elizabeth C. Carter, Sue A. Kauzlarich, Susan M. Single-Crystalline Germanium Nanocrystals via a Two-Step Microwave-Assisted Colloidal Synthesis from GeI(4) |
title | Single-Crystalline Germanium Nanocrystals via a Two-Step
Microwave-Assisted Colloidal Synthesis from GeI(4) |
title_full | Single-Crystalline Germanium Nanocrystals via a Two-Step
Microwave-Assisted Colloidal Synthesis from GeI(4) |
title_fullStr | Single-Crystalline Germanium Nanocrystals via a Two-Step
Microwave-Assisted Colloidal Synthesis from GeI(4) |
title_full_unstemmed | Single-Crystalline Germanium Nanocrystals via a Two-Step
Microwave-Assisted Colloidal Synthesis from GeI(4) |
title_short | Single-Crystalline Germanium Nanocrystals via a Two-Step
Microwave-Assisted Colloidal Synthesis from GeI(4) |
title_sort | single-crystalline germanium nanocrystals via a two-step
microwave-assisted colloidal synthesis from gei(4) |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9888621/ https://www.ncbi.nlm.nih.gov/pubmed/36855386 http://dx.doi.org/10.1021/acsmaterialsau.1c00072 |
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