Cargando…
Influence of Size and Shape Anisotropy on Optical Properties of CdSe Quantum Dots
We used low-temperature reactions to synthesize different-sized CdSe quantum dots (QDs) capped with fatty-acid and phosphine ligands. From the correlation of high-resolution transmission electron microscopy and X-ray diffraction (XRD) analyses of the synthesized QDs, we observed size-dependent shape...
Autores principales: | , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2020
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7466547/ https://www.ncbi.nlm.nih.gov/pubmed/32806736 http://dx.doi.org/10.3390/nano10081589 |
_version_ | 1783577838839922688 |
---|---|
author | Kim, Sung Hun Man, Minh Tan Lee, Joong Wook Park, Kyoung-Duck Lee, Hong Seok |
author_facet | Kim, Sung Hun Man, Minh Tan Lee, Joong Wook Park, Kyoung-Duck Lee, Hong Seok |
author_sort | Kim, Sung Hun |
collection | PubMed |
description | We used low-temperature reactions to synthesize different-sized CdSe quantum dots (QDs) capped with fatty-acid and phosphine ligands. From the correlation of high-resolution transmission electron microscopy and X-ray diffraction (XRD) analyses of the synthesized QDs, we observed size-dependent shape anisotropy. In addition, the recorded XRD patterns revealed mixed crystal facets with zinc blende and wurtzite structures in small-sized QDs. Furthermore, from differential absorption (DA) spectra, we extracted the electronic transition energies for different-sized QDs, which were found to be similar to the calculated values of the quantum size levels associated with band mixing of CdSe QDs with a moderate bandgap. We found that the excitonic absorption peaks are increasingly “hidden” with decreasing QD size because of the crystal structure and crystalline quality. The results show good agreement with the obtained diffraction patterns and the estimation errors obtained from the DA spectra. |
format | Online Article Text |
id | pubmed-7466547 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-74665472020-09-14 Influence of Size and Shape Anisotropy on Optical Properties of CdSe Quantum Dots Kim, Sung Hun Man, Minh Tan Lee, Joong Wook Park, Kyoung-Duck Lee, Hong Seok Nanomaterials (Basel) Article We used low-temperature reactions to synthesize different-sized CdSe quantum dots (QDs) capped with fatty-acid and phosphine ligands. From the correlation of high-resolution transmission electron microscopy and X-ray diffraction (XRD) analyses of the synthesized QDs, we observed size-dependent shape anisotropy. In addition, the recorded XRD patterns revealed mixed crystal facets with zinc blende and wurtzite structures in small-sized QDs. Furthermore, from differential absorption (DA) spectra, we extracted the electronic transition energies for different-sized QDs, which were found to be similar to the calculated values of the quantum size levels associated with band mixing of CdSe QDs with a moderate bandgap. We found that the excitonic absorption peaks are increasingly “hidden” with decreasing QD size because of the crystal structure and crystalline quality. The results show good agreement with the obtained diffraction patterns and the estimation errors obtained from the DA spectra. MDPI 2020-08-12 /pmc/articles/PMC7466547/ /pubmed/32806736 http://dx.doi.org/10.3390/nano10081589 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Kim, Sung Hun Man, Minh Tan Lee, Joong Wook Park, Kyoung-Duck Lee, Hong Seok Influence of Size and Shape Anisotropy on Optical Properties of CdSe Quantum Dots |
title | Influence of Size and Shape Anisotropy on Optical Properties of CdSe Quantum Dots |
title_full | Influence of Size and Shape Anisotropy on Optical Properties of CdSe Quantum Dots |
title_fullStr | Influence of Size and Shape Anisotropy on Optical Properties of CdSe Quantum Dots |
title_full_unstemmed | Influence of Size and Shape Anisotropy on Optical Properties of CdSe Quantum Dots |
title_short | Influence of Size and Shape Anisotropy on Optical Properties of CdSe Quantum Dots |
title_sort | influence of size and shape anisotropy on optical properties of cdse quantum dots |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7466547/ https://www.ncbi.nlm.nih.gov/pubmed/32806736 http://dx.doi.org/10.3390/nano10081589 |
work_keys_str_mv | AT kimsunghun influenceofsizeandshapeanisotropyonopticalpropertiesofcdsequantumdots AT manminhtan influenceofsizeandshapeanisotropyonopticalpropertiesofcdsequantumdots AT leejoongwook influenceofsizeandshapeanisotropyonopticalpropertiesofcdsequantumdots AT parkkyoungduck influenceofsizeandshapeanisotropyonopticalpropertiesofcdsequantumdots AT leehongseok influenceofsizeandshapeanisotropyonopticalpropertiesofcdsequantumdots |