In the present study, we systematically examine structures and absorption spectra for CdS nanoplatelets (NPLs) with thicknesses of two and three monolayers (2 MLs and 3 MLs) and extended lateral dimensions. These nanoplatelet model systems, passivated with formate and acetate ligands, are used to analyze the effects of quantum confinement in the lateral dimension within an extended monolayer and the effects of thickness when changing from two to three monolayers. Based on the computed cubic structures using density functional theory (DFT), we found good agreement between observed and time-dependent DFT-calculated spectra, revealing little ligand participation to influence the color and intensity of low-energy absorption bands as the structures are laterally extended to eight and seven monolayers for 2-ML and 3-ML systems, respectively. The spectral redshift for 3-ML CdS NPLs is attributed to the electron delocalization due to expansion of the nanoplatelet in the lateral and vertical directions.
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7 September 2021
Research Article|
September 01 2021
Theoretical analysis of structures and electronic spectra of molecular colloidal cadmium sulfide clusters and nanoplatelets
Special Collection:
From Atom-Precise Nanoclusters to Superatom Materials
Kiet A. Nguyen
;
Kiet A. Nguyen
a)
1
Air Force Research Laboratory
, Materials and Manufacturing Directorate, Wright-Patterson Air Force Base, Ohio 45433, USA
2
UES, Inc.
, Dayton, Ohio 45432, USA
a)Authors to whom correspondence should be addressed: kiet.nguyen.2.ctr@afresearchlab.com and ruth.pachter@us.af.mil
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Ruth Pachter
;
Ruth Pachter
a)
1
Air Force Research Laboratory
, Materials and Manufacturing Directorate, Wright-Patterson Air Force Base, Ohio 45433, USA
a)Authors to whom correspondence should be addressed: kiet.nguyen.2.ctr@afresearchlab.com and ruth.pachter@us.af.mil
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Paul N. Day
Paul N. Day
1
Air Force Research Laboratory
, Materials and Manufacturing Directorate, Wright-Patterson Air Force Base, Ohio 45433, USA
2
UES, Inc.
, Dayton, Ohio 45432, USA
Search for other works by this author on:
a)Authors to whom correspondence should be addressed: kiet.nguyen.2.ctr@afresearchlab.com and ruth.pachter@us.af.mil
Note: This paper is part of the JCP Special Topic on From Atom-Precise Nanoclusters to Superatom Materials.
J. Chem. Phys. 155, 094302 (2021)
Article history
Received:
May 17 2021
Accepted:
August 06 2021
Citation
Kiet A. Nguyen, Ruth Pachter, Paul N. Day; Theoretical analysis of structures and electronic spectra of molecular colloidal cadmium sulfide clusters and nanoplatelets. J. Chem. Phys. 7 September 2021; 155 (9): 094302. https://doi.org/10.1063/5.0057089
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