Journal of Alloys and Compounds, volume 860, pages 158443
Absorption and emission in the visible range by ultra-small PbS quantum dots in the strong quantum confinement regime with S-terminated surfaces capped with diphenylphosphine
Publication type: Journal Article
Publication date: 2021-04-01
Journal:
Journal of Alloys and Compounds
Quartile SCImago
Q1
Quartile WOS
Q1
Impact factor: 6.2
ISSN: 09258388
Materials Chemistry
Metals and Alloys
Mechanical Engineering
Mechanics of Materials
Abstract
• Diphenylphosphine in the synthesis of PbS QDs can act as capping ligand. • Diphenylphosphine capped PbS QDs display a S-terminated surface. • S-terminated ultra-small PbS QDs display novel optoelectronic properties. The synthesis and characterization of PbS QDs absorbing and emitting in the visible range is a very challenging task, since it requires the QDs to be within the strong quantum confinement regime (QD size<2.5 nm). It implies not only having “small” QDs, but also stable and monodisperse; characteristics that have been elusive to achieve for many researchers. In the current work, ultra-small PbS QDs (size ~2 nm) were synthesized based on a modification of the Hines method, controlling the reaction time, and adding diphenylphosphine (DPP) which serves as a catalyst and a protective agent in the reaction synthesis. Novel ultra-small PbS QDs with S-terminated surfaces were obtained, which formed at the early stages of the synthesis reaction and are stabilized by the DPP; as it was suggested by the TEM, FTIR and Raman results. The ultra-small PbS QDs display a maximum peak of optical absorption at ~532 nm, with a corresponding optical band gap of 1.82 eV; a maximum peak of emission at ~679 nm, which results in a Stokes shift of 119 nm, smaller than the Stokes shift observed in “larger” PbS QDs. These ultra-small QDs displayed an average size of ~2 nm, with a standard deviation of ~0.3 nm, which was the smallest among the synthesized samples, based on TEM measurements. Finally, the LUMO and HOMO levels were measured by means of cyclic voltammetry and optical absorption spectroscopy. The values of the optical band gap and the energies measured for the LUMO and HOMO levels of these ultra-small PbS QDs were affected by their atomistic surface arrangement and the capping ligand interacting with their surface. Producing variations in their values that doesn’t follow the trends established for quantum confinement effects related to size variation only. Thorough physical and chemical characterization of such ultra-small PbS QDs are crucial in understanding the origin of their optoelectronic properties, which will contribute to better delineate possible future applications.
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Torres Gómez N. et al. Absorption and emission in the visible range by ultra-small PbS quantum dots in the strong quantum confinement regime with S-terminated surfaces capped with diphenylphosphine // Journal of Alloys and Compounds. 2021. Vol. 860. p. 158443.
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Torres Gómez N., Garcia Gutierrez D. F., Lara Canche A. R., Triana Cruz L., Arizpe Zapata J. A., García Gutierrez D. I. Absorption and emission in the visible range by ultra-small PbS quantum dots in the strong quantum confinement regime with S-terminated surfaces capped with diphenylphosphine // Journal of Alloys and Compounds. 2021. Vol. 860. p. 158443.
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TY - JOUR
DO - 10.1016/j.jallcom.2020.158443
UR - https://doi.org/10.1016/j.jallcom.2020.158443
TI - Absorption and emission in the visible range by ultra-small PbS quantum dots in the strong quantum confinement regime with S-terminated surfaces capped with diphenylphosphine
T2 - Journal of Alloys and Compounds
AU - Torres Gómez, Nayely
AU - Garcia Gutierrez, Diana F
AU - Lara Canche, Alan R
AU - Triana Cruz, Lizbeth
AU - Arizpe Zapata, Jesus A
AU - García Gutierrez, Domingo I
PY - 2021
DA - 2021/04/01 00:00:00
PB - Elsevier
SP - 158443
VL - 860
SN - 0925-8388
ER -
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@article{2021_Torres Gómez,
author = {Nayely Torres Gómez and Diana F Garcia Gutierrez and Alan R Lara Canche and Lizbeth Triana Cruz and Jesus A Arizpe Zapata and Domingo I García Gutierrez},
title = {Absorption and emission in the visible range by ultra-small PbS quantum dots in the strong quantum confinement regime with S-terminated surfaces capped with diphenylphosphine},
journal = {Journal of Alloys and Compounds},
year = {2021},
volume = {860},
publisher = {Elsevier},
month = {apr},
url = {https://doi.org/10.1016/j.jallcom.2020.158443},
pages = {158443},
doi = {10.1016/j.jallcom.2020.158443}
}