Far-infrared spectroscopy of Cd1-xMnxS quantum dots
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2012
Authors
Kostić, RadmilaDamjanovic, M. Petrovic
Romčević, Nebojša Ž.
Romčević, Maja J.
Stojanović, Dušanka
Čomor, Mirjana
Article (Published version)
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Far-infrared reflectivity spectra, in spectral region 50-600 cm(-1) and temperature region 80-300 K, of CdS and Cd1-xMnxS nanocrystals embedded in hexametaphosphate, are presented. The analysis of the far-infrared experimental reflectivity spectrum was made by the fitting procedure. The Maxwell-Garnet effective medium theory is used for modeling an effective dielectric function as well as to separate respond from nanoparticles. To analyze spectra in CdS omega(TO)(approximate to 238 cm(-1)) to omega(TO)(approximate to 305 cm(-1)) spectral region, quantized dipolar modes in a spherical isotropic material quantum dot (QD) are considered in the framework of a continuum model. As to the mechanical boundary conditions rigid sphere is concerned. Experimental far-infrared reflectivity spectra of our samples are in general agreement with the predictions of this model. Experimentally registered and through fitting procedure located features for CdS nanoparticles in spectral region below CdS omeg...a(TO) at: approximate to 102 cm(-1), approximate to 135 cm(-1), approximate to 170 cm(-1) and approximate to 210 cm(-1) are associated to defect induced modes, especially to defects located near the surface of CdS QD. In region over CdS omega(LO), modes are identified as multiphonons. In Cd1-xMnxS QD spectra new reflectivity peaks are at: approximate to 85 cm(-1), approximate to 110 cm(-1) and approximate to 180 cm(-1) in spectral region below CdS omega(TO), approximate to 270 cm(-1) inside CdS omega(TO)-omega(LO) spectral region and approximate to 356 cm(-1) and approximate to 376 cm(-1) in region over CdS omega(LO). First two registered modes are associated to both mass and force constant defects at the surface, and rest four modes are consequence of MnS phases present in the sample. (C) 2012 Published by Elsevier B.V.
Keywords:
Nanostructured materials / Phonons / Semiconductors / Light absorption and reflectionSource:
Journal of Alloys and Compounds, 2012, 521, 134-140Funding / projects:
- Materials of Reduced Dimensions for Efficient Light Harvesting and Energy conversion (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-45020)
- Optoelectronics nanodimension systems - the rout towards applications (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-45003)
DOI: 10.1016/j.jallcom.2012.01.079
ISSN: 0925-8388
WoS: 000300822300024
Scopus: 2-s2.0-84857451485
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VinčaTY - JOUR AU - Kostić, Radmila AU - Damjanovic, M. Petrovic AU - Romčević, Nebojša Ž. AU - Romčević, Maja J. AU - Stojanović, Dušanka AU - Čomor, Mirjana PY - 2012 UR - https://vinar.vin.bg.ac.rs/handle/123456789/4714 AB - Far-infrared reflectivity spectra, in spectral region 50-600 cm(-1) and temperature region 80-300 K, of CdS and Cd1-xMnxS nanocrystals embedded in hexametaphosphate, are presented. The analysis of the far-infrared experimental reflectivity spectrum was made by the fitting procedure. The Maxwell-Garnet effective medium theory is used for modeling an effective dielectric function as well as to separate respond from nanoparticles. To analyze spectra in CdS omega(TO)(approximate to 238 cm(-1)) to omega(TO)(approximate to 305 cm(-1)) spectral region, quantized dipolar modes in a spherical isotropic material quantum dot (QD) are considered in the framework of a continuum model. As to the mechanical boundary conditions rigid sphere is concerned. Experimental far-infrared reflectivity spectra of our samples are in general agreement with the predictions of this model. Experimentally registered and through fitting procedure located features for CdS nanoparticles in spectral region below CdS omega(TO) at: approximate to 102 cm(-1), approximate to 135 cm(-1), approximate to 170 cm(-1) and approximate to 210 cm(-1) are associated to defect induced modes, especially to defects located near the surface of CdS QD. In region over CdS omega(LO), modes are identified as multiphonons. In Cd1-xMnxS QD spectra new reflectivity peaks are at: approximate to 85 cm(-1), approximate to 110 cm(-1) and approximate to 180 cm(-1) in spectral region below CdS omega(TO), approximate to 270 cm(-1) inside CdS omega(TO)-omega(LO) spectral region and approximate to 356 cm(-1) and approximate to 376 cm(-1) in region over CdS omega(LO). First two registered modes are associated to both mass and force constant defects at the surface, and rest four modes are consequence of MnS phases present in the sample. (C) 2012 Published by Elsevier B.V. T2 - Journal of Alloys and Compounds T1 - Far-infrared spectroscopy of Cd1-xMnxS quantum dots VL - 521 SP - 134 EP - 140 DO - 10.1016/j.jallcom.2012.01.079 ER -
@article{ author = "Kostić, Radmila and Damjanovic, M. Petrovic and Romčević, Nebojša Ž. and Romčević, Maja J. and Stojanović, Dušanka and Čomor, Mirjana", year = "2012", abstract = "Far-infrared reflectivity spectra, in spectral region 50-600 cm(-1) and temperature region 80-300 K, of CdS and Cd1-xMnxS nanocrystals embedded in hexametaphosphate, are presented. The analysis of the far-infrared experimental reflectivity spectrum was made by the fitting procedure. The Maxwell-Garnet effective medium theory is used for modeling an effective dielectric function as well as to separate respond from nanoparticles. To analyze spectra in CdS omega(TO)(approximate to 238 cm(-1)) to omega(TO)(approximate to 305 cm(-1)) spectral region, quantized dipolar modes in a spherical isotropic material quantum dot (QD) are considered in the framework of a continuum model. As to the mechanical boundary conditions rigid sphere is concerned. Experimental far-infrared reflectivity spectra of our samples are in general agreement with the predictions of this model. Experimentally registered and through fitting procedure located features for CdS nanoparticles in spectral region below CdS omega(TO) at: approximate to 102 cm(-1), approximate to 135 cm(-1), approximate to 170 cm(-1) and approximate to 210 cm(-1) are associated to defect induced modes, especially to defects located near the surface of CdS QD. In region over CdS omega(LO), modes are identified as multiphonons. In Cd1-xMnxS QD spectra new reflectivity peaks are at: approximate to 85 cm(-1), approximate to 110 cm(-1) and approximate to 180 cm(-1) in spectral region below CdS omega(TO), approximate to 270 cm(-1) inside CdS omega(TO)-omega(LO) spectral region and approximate to 356 cm(-1) and approximate to 376 cm(-1) in region over CdS omega(LO). First two registered modes are associated to both mass and force constant defects at the surface, and rest four modes are consequence of MnS phases present in the sample. (C) 2012 Published by Elsevier B.V.", journal = "Journal of Alloys and Compounds", title = "Far-infrared spectroscopy of Cd1-xMnxS quantum dots", volume = "521", pages = "134-140", doi = "10.1016/j.jallcom.2012.01.079" }
Kostić, R., Damjanovic, M. P., Romčević, N. Ž., Romčević, M. J., Stojanović, D.,& Čomor, M.. (2012). Far-infrared spectroscopy of Cd1-xMnxS quantum dots. in Journal of Alloys and Compounds, 521, 134-140. https://doi.org/10.1016/j.jallcom.2012.01.079
Kostić R, Damjanovic MP, Romčević NŽ, Romčević MJ, Stojanović D, Čomor M. Far-infrared spectroscopy of Cd1-xMnxS quantum dots. in Journal of Alloys and Compounds. 2012;521:134-140. doi:10.1016/j.jallcom.2012.01.079 .
Kostić, Radmila, Damjanovic, M. Petrovic, Romčević, Nebojša Ž., Romčević, Maja J., Stojanović, Dušanka, Čomor, Mirjana, "Far-infrared spectroscopy of Cd1-xMnxS quantum dots" in Journal of Alloys and Compounds, 521 (2012):134-140, https://doi.org/10.1016/j.jallcom.2012.01.079 . .