Investigations on the electronic properties and effect of chitosan capping on the structural and optical properties of zinc aluminate quantum dots
Abstract
Quantum confined uncapped and chitosan capped nanoparticles of ZnAl2O4 synthesized by microwave-assisted sol–gel method were investigated by structural analysis and optical techniques. X-ray diffraction studies confirmed the formation of cubic spinels with crystallite size 4.5 nm and 3.4 nm, respectively for uncapped and chitosan capped ZnAl2O4 nanoparticles. Chitosan capping produced a blue shift in bandgap energy (3.84 to 3.94 eV) agreeing with size effects according to the Brus equation. A blue shift in emission peak and enhancement in photoluminescence intensity was also observed upon chitosan capping. The electronic band structure and the density of states of the bulk spinel were also calculated using density functional theory. The effective masses of electrons and holes estimated based on the band structure were used to extract the excitonic Bohr radius.
- Authors:
-
- Union Christian College (India)
- Michigan Technological Univ., Houghton, MI (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- CHRIST (Deemed to be University) Bengaluru (India)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1836441
- Alternate Identifier(s):
- OSTI ID: 1862598
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Applied Surface Science
- Additional Journal Information:
- Journal Volume: 579; Journal Issue: March; Journal ID: ISSN 0169-4332
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Zinc aluminate; Chitosan; Density functional theory; Microwave assisted sol–gel synthesis; Photoluminescence; Brus equation; Bandgap; Quantum confinement
Citation Formats
Varghese, Aveena, Kuriakose, Elezabeth, Jose, Jervise, Aryal, Sandip, Khanal, Rabi, and Anila, E I. Investigations on the electronic properties and effect of chitosan capping on the structural and optical properties of zinc aluminate quantum dots. United States: N. p., 2021.
Web. doi:10.1016/j.apsusc.2021.152162.
Varghese, Aveena, Kuriakose, Elezabeth, Jose, Jervise, Aryal, Sandip, Khanal, Rabi, & Anila, E I. Investigations on the electronic properties and effect of chitosan capping on the structural and optical properties of zinc aluminate quantum dots. United States. https://doi.org/10.1016/j.apsusc.2021.152162
Varghese, Aveena, Kuriakose, Elezabeth, Jose, Jervise, Aryal, Sandip, Khanal, Rabi, and Anila, E I. Fri .
"Investigations on the electronic properties and effect of chitosan capping on the structural and optical properties of zinc aluminate quantum dots". United States. https://doi.org/10.1016/j.apsusc.2021.152162. https://www.osti.gov/servlets/purl/1836441.
@article{osti_1836441,
title = {Investigations on the electronic properties and effect of chitosan capping on the structural and optical properties of zinc aluminate quantum dots},
author = {Varghese, Aveena and Kuriakose, Elezabeth and Jose, Jervise and Aryal, Sandip and Khanal, Rabi and Anila, E I.},
abstractNote = {Quantum confined uncapped and chitosan capped nanoparticles of ZnAl2O4 synthesized by microwave-assisted sol–gel method were investigated by structural analysis and optical techniques. X-ray diffraction studies confirmed the formation of cubic spinels with crystallite size 4.5 nm and 3.4 nm, respectively for uncapped and chitosan capped ZnAl2O4 nanoparticles. Chitosan capping produced a blue shift in bandgap energy (3.84 to 3.94 eV) agreeing with size effects according to the Brus equation. A blue shift in emission peak and enhancement in photoluminescence intensity was also observed upon chitosan capping. The electronic band structure and the density of states of the bulk spinel were also calculated using density functional theory. The effective masses of electrons and holes estimated based on the band structure were used to extract the excitonic Bohr radius.},
doi = {10.1016/j.apsusc.2021.152162},
journal = {Applied Surface Science},
number = March,
volume = 579,
place = {United States},
year = {2021},
month = {12}
}
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