Raman spectroscopy of ZnS quantum dots
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Trajić, JelenaKostić, Radmila
Romčević, Nebojša Ž.
Romčević, Maja J.
Mitrić, Miodrag
Lazović, Vladimir M.
Balaž, Peter
Stojanović, Dušanka
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ZnS nanoparticles were synthesized mechanochemically by high-energy milling. In order to investigate influence off milling time to sample properties, samples were produced in three different milling times (5 min, 10 min and 20 min). The morphology of samples has been investigated by scanning electron microscopy (SEM) and high resolution transmission electron microscopy (HRTEM). X-ray diffraction (XRD) investigation of synthesized nanocrystals identified cubic structure. From XRD, ZnS size of crystallites was estimated as 1.9 nm (after 5 min milling time), 2.3 nm (10 min) and 2.4 nm (20 min), implying that we are in strong confinement regime. The optical properties were studied by Raman spectroscopy, in spectral region 100-500 cm(-1), excitation source was 514.5 nm (E-L = 2.41 eV), which means that we are in off resonant regime. Dominant spectral structures, of comparable intensity, are registered in spectral region 130-180 cm(-1), around 265 cm(-1) and around 345 cm(-1). First two are ...assigned as second-order ZnS modes. A theoretical model of continuum medium was used to calculate frequencies of the confined optical phonons in ZnS. Satisfactory agreement with experimental results was found and mode at 345 cm(-)1 is assigned as LO type phonon confined in ZnS nanocrystal. (C) 2015 Elsevier B.V. All rights reserved.
Keywords:
Nanostructured materials / Scanning electron microscopy / X-ray diffraction / Light absorption and reflectionSource:
Journal of Alloys and Compounds, 2015, 637, 401-406Funding / projects:
- Optoelectronics nanodimension systems - the rout towards applications (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-45003)
- Slovak Grant Agency VEGA [2/0027/14]
DOI: 10.1016/j.jallcom.2015.03.027
ISSN: 0925-8388; 1873-4669
WoS: 000353377200060
Scopus: 2-s2.0-84925062121
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VinčaTY - JOUR AU - Trajić, Jelena AU - Kostić, Radmila AU - Romčević, Nebojša Ž. AU - Romčević, Maja J. AU - Mitrić, Miodrag AU - Lazović, Vladimir M. AU - Balaž, Peter AU - Stojanović, Dušanka PY - 2015 UR - https://vinar.vin.bg.ac.rs/handle/123456789/509 AB - ZnS nanoparticles were synthesized mechanochemically by high-energy milling. In order to investigate influence off milling time to sample properties, samples were produced in three different milling times (5 min, 10 min and 20 min). The morphology of samples has been investigated by scanning electron microscopy (SEM) and high resolution transmission electron microscopy (HRTEM). X-ray diffraction (XRD) investigation of synthesized nanocrystals identified cubic structure. From XRD, ZnS size of crystallites was estimated as 1.9 nm (after 5 min milling time), 2.3 nm (10 min) and 2.4 nm (20 min), implying that we are in strong confinement regime. The optical properties were studied by Raman spectroscopy, in spectral region 100-500 cm(-1), excitation source was 514.5 nm (E-L = 2.41 eV), which means that we are in off resonant regime. Dominant spectral structures, of comparable intensity, are registered in spectral region 130-180 cm(-1), around 265 cm(-1) and around 345 cm(-1). First two are assigned as second-order ZnS modes. A theoretical model of continuum medium was used to calculate frequencies of the confined optical phonons in ZnS. Satisfactory agreement with experimental results was found and mode at 345 cm(-)1 is assigned as LO type phonon confined in ZnS nanocrystal. (C) 2015 Elsevier B.V. All rights reserved. T2 - Journal of Alloys and Compounds T1 - Raman spectroscopy of ZnS quantum dots VL - 637 SP - 401 EP - 406 DO - 10.1016/j.jallcom.2015.03.027 ER -
@article{ author = "Trajić, Jelena and Kostić, Radmila and Romčević, Nebojša Ž. and Romčević, Maja J. and Mitrić, Miodrag and Lazović, Vladimir M. and Balaž, Peter and Stojanović, Dušanka", year = "2015", abstract = "ZnS nanoparticles were synthesized mechanochemically by high-energy milling. In order to investigate influence off milling time to sample properties, samples were produced in three different milling times (5 min, 10 min and 20 min). The morphology of samples has been investigated by scanning electron microscopy (SEM) and high resolution transmission electron microscopy (HRTEM). X-ray diffraction (XRD) investigation of synthesized nanocrystals identified cubic structure. From XRD, ZnS size of crystallites was estimated as 1.9 nm (after 5 min milling time), 2.3 nm (10 min) and 2.4 nm (20 min), implying that we are in strong confinement regime. The optical properties were studied by Raman spectroscopy, in spectral region 100-500 cm(-1), excitation source was 514.5 nm (E-L = 2.41 eV), which means that we are in off resonant regime. Dominant spectral structures, of comparable intensity, are registered in spectral region 130-180 cm(-1), around 265 cm(-1) and around 345 cm(-1). First two are assigned as second-order ZnS modes. A theoretical model of continuum medium was used to calculate frequencies of the confined optical phonons in ZnS. Satisfactory agreement with experimental results was found and mode at 345 cm(-)1 is assigned as LO type phonon confined in ZnS nanocrystal. (C) 2015 Elsevier B.V. All rights reserved.", journal = "Journal of Alloys and Compounds", title = "Raman spectroscopy of ZnS quantum dots", volume = "637", pages = "401-406", doi = "10.1016/j.jallcom.2015.03.027" }
Trajić, J., Kostić, R., Romčević, N. Ž., Romčević, M. J., Mitrić, M., Lazović, V. M., Balaž, P.,& Stojanović, D.. (2015). Raman spectroscopy of ZnS quantum dots. in Journal of Alloys and Compounds, 637, 401-406. https://doi.org/10.1016/j.jallcom.2015.03.027
Trajić J, Kostić R, Romčević NŽ, Romčević MJ, Mitrić M, Lazović VM, Balaž P, Stojanović D. Raman spectroscopy of ZnS quantum dots. in Journal of Alloys and Compounds. 2015;637:401-406. doi:10.1016/j.jallcom.2015.03.027 .
Trajić, Jelena, Kostić, Radmila, Romčević, Nebojša Ž., Romčević, Maja J., Mitrić, Miodrag, Lazović, Vladimir M., Balaž, Peter, Stojanović, Dušanka, "Raman spectroscopy of ZnS quantum dots" in Journal of Alloys and Compounds, 637 (2015):401-406, https://doi.org/10.1016/j.jallcom.2015.03.027 . .