Infrared study of plasmon-phonon coupling in pure and Nd-doped CeO2-y nanocrystals
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2015
Authors
Radović, Marko B.Dohcevic-Mitrovic, Z.
Paunović, Novica M.
Bošković, Snežana B.
Tomić, Nataša
Tadić, Nenad
Belca, I.
Article (Published version)
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Plasmon-longitudinal-optical (LO) phonon interaction in pure and Nd-doped CeO2-y nanocrystals was investigated by measuring far-infrared reflectivity spectra in the 100-700 cm(-1) spectral range at room temperature. Analysis of the obtained results revealed that the presence of free charge carriers becomes significant with the particle size decrease to nanometer range and increase of lattice defects. The free charge carriers were found to be responsible for a plasmon mode which coupled strongly with two LO phonon modes of ceria. The presence of more pronounced low-frequency Drude tail and the screening of the phonon modes in Nd-doped CeO2-y nanocrystals implied that the Plasmon-LO phonon interaction increased with doping. Factorized and additive dielectric function models were applied to deduce about the coupled and decoupled LO phonon frequencies and the structure of the decoupled plasmon mode in pure and Nd-doped CeO2-y nanocrystals. These models were combined with Bruggeman effectiv...e medium approximation in order to properly describe the influence of porosity on the infrared reflectivity spectra. With increasing dopant content, the decoupled plasmon mode exhibited redshift and damping decrease implying that doping induced semiconductor-to-metalic state transition took place.
Keywords:
Nd-doped ceria nanocrystals / infrared spectroscopy / plasmon-phonon interactionSource:
Journal of Physics. D: Applied Physics, 2015, 48, 6Funding / projects:
- Physics of nanostructured oxide materials and strongly correlated systems (RS-MESTD-Basic Research (BR or ON)-171032)
- Nanostructured multifunctional materials and nanocomposites (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-45018)
- A von Humboldt Foundation
DOI: 10.1088/0022-3727/48/6/065301
ISSN: 0022-3727; 1361-6463
WoS: 000348842600008
Scopus: 2-s2.0-84921915655
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VinčaTY - JOUR AU - Radović, Marko B. AU - Dohcevic-Mitrovic, Z. AU - Paunović, Novica M. AU - Bošković, Snežana B. AU - Tomić, Nataša AU - Tadić, Nenad AU - Belca, I. PY - 2015 UR - https://vinar.vin.bg.ac.rs/handle/123456789/379 AB - Plasmon-longitudinal-optical (LO) phonon interaction in pure and Nd-doped CeO2-y nanocrystals was investigated by measuring far-infrared reflectivity spectra in the 100-700 cm(-1) spectral range at room temperature. Analysis of the obtained results revealed that the presence of free charge carriers becomes significant with the particle size decrease to nanometer range and increase of lattice defects. The free charge carriers were found to be responsible for a plasmon mode which coupled strongly with two LO phonon modes of ceria. The presence of more pronounced low-frequency Drude tail and the screening of the phonon modes in Nd-doped CeO2-y nanocrystals implied that the Plasmon-LO phonon interaction increased with doping. Factorized and additive dielectric function models were applied to deduce about the coupled and decoupled LO phonon frequencies and the structure of the decoupled plasmon mode in pure and Nd-doped CeO2-y nanocrystals. These models were combined with Bruggeman effective medium approximation in order to properly describe the influence of porosity on the infrared reflectivity spectra. With increasing dopant content, the decoupled plasmon mode exhibited redshift and damping decrease implying that doping induced semiconductor-to-metalic state transition took place. T2 - Journal of Physics. D: Applied Physics T1 - Infrared study of plasmon-phonon coupling in pure and Nd-doped CeO2-y nanocrystals VL - 48 IS - 6 DO - 10.1088/0022-3727/48/6/065301 ER -
@article{ author = "Radović, Marko B. and Dohcevic-Mitrovic, Z. and Paunović, Novica M. and Bošković, Snežana B. and Tomić, Nataša and Tadić, Nenad and Belca, I.", year = "2015", abstract = "Plasmon-longitudinal-optical (LO) phonon interaction in pure and Nd-doped CeO2-y nanocrystals was investigated by measuring far-infrared reflectivity spectra in the 100-700 cm(-1) spectral range at room temperature. Analysis of the obtained results revealed that the presence of free charge carriers becomes significant with the particle size decrease to nanometer range and increase of lattice defects. The free charge carriers were found to be responsible for a plasmon mode which coupled strongly with two LO phonon modes of ceria. The presence of more pronounced low-frequency Drude tail and the screening of the phonon modes in Nd-doped CeO2-y nanocrystals implied that the Plasmon-LO phonon interaction increased with doping. Factorized and additive dielectric function models were applied to deduce about the coupled and decoupled LO phonon frequencies and the structure of the decoupled plasmon mode in pure and Nd-doped CeO2-y nanocrystals. These models were combined with Bruggeman effective medium approximation in order to properly describe the influence of porosity on the infrared reflectivity spectra. With increasing dopant content, the decoupled plasmon mode exhibited redshift and damping decrease implying that doping induced semiconductor-to-metalic state transition took place.", journal = "Journal of Physics. D: Applied Physics", title = "Infrared study of plasmon-phonon coupling in pure and Nd-doped CeO2-y nanocrystals", volume = "48", number = "6", doi = "10.1088/0022-3727/48/6/065301" }
Radović, M. B., Dohcevic-Mitrovic, Z., Paunović, N. M., Bošković, S. B., Tomić, N., Tadić, N.,& Belca, I.. (2015). Infrared study of plasmon-phonon coupling in pure and Nd-doped CeO2-y nanocrystals. in Journal of Physics. D: Applied Physics, 48(6). https://doi.org/10.1088/0022-3727/48/6/065301
Radović MB, Dohcevic-Mitrovic Z, Paunović NM, Bošković SB, Tomić N, Tadić N, Belca I. Infrared study of plasmon-phonon coupling in pure and Nd-doped CeO2-y nanocrystals. in Journal of Physics. D: Applied Physics. 2015;48(6). doi:10.1088/0022-3727/48/6/065301 .
Radović, Marko B., Dohcevic-Mitrovic, Z., Paunović, Novica M., Bošković, Snežana B., Tomić, Nataša, Tadić, Nenad, Belca, I., "Infrared study of plasmon-phonon coupling in pure and Nd-doped CeO2-y nanocrystals" in Journal of Physics. D: Applied Physics, 48, no. 6 (2015), https://doi.org/10.1088/0022-3727/48/6/065301 . .