TY  - CONF
AU  - Nevar, A.
AU  - Nedelko, M.
AU  - Radomzev, A.
AU  - Tarasenko, N.
AU  - Savović, Jelena
AU  - Kuzmanović, Miroslav M.
AU  - Ranković, D.
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10911
AB  - For elucidation a possibility to use molecular emission spectra in LIBS analysis of carbon containing materials time and space resolved spectra of laser ablation plasma from graphite were studied. Laser plasma was produced on a rotated graphite target by fundamental harmonic of YAG: Nd3+ laser (Lotis TII) in air at atmospheric pressure. The optical emission spectra were analyzed using a GSM850 Lotis TII monochromator/spectrograph equipped with a CCD detector. The atomic and molecular spectra in the region of emission of molecules C2 (λ = 516,52 nm) and CN (λ = 421,16 nm) were registered by photomultiplier placed behind the interference filter to record the intensity of the selected plasma emission line. The temporal and spatial characteristics of the plasma spectra with special attention to molecular carbon including molecules СN and С2 were analyzed. It was found that the time range of dominance of the C2 and CN emission is related to the stage of the plasma decay (10–20 μs after the action of the laser pulse, depending on the conditions for plasma creating). The atomic emission spectra of the plasma were used to estimate the concentration of electrons and the electron temperature of the plasma. The vibrational temperature of the carbon plasma was determined from the molecular spectrum of the radical СN ((∆ν = 0, -1). The plasma electron concentration and electron temperature as well as vibrational temperature were determined in different zones of the expanding plasma and at different values of laser power densities (2,2·108 ÷ 3,7·108 W/cm2 ) used in experiments. The electron temperature varied in the range 9700 – 10300 K, the electron concentration was estimated to be in the range from 0,8·1018 cm-3 to 8,0·1018 cm-3 , the vibrational temperature of the plasma was 4560 - 7350 K depending on the experimental conditions (laser power density, spatial zone of the plasma plume).
PB  - Belgrade : Institute of Physics Belgrade
C3  - PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade
T1  - Time-spatial resolved LIBS of atomic and molecular carbon in laser ablation plasma
SP  - 135
UR  - https://hdl.handle.net/21.15107/rcub_vinar_10911
ER  - 

@conference{
author = "Nevar, A. and Nedelko, M. and Radomzev, A. and Tarasenko, N. and Savović, Jelena and Kuzmanović, Miroslav M. and Ranković, D.",
year = "2021",
abstract = "For elucidation a possibility to use molecular emission spectra in LIBS analysis of carbon containing materials time and space resolved spectra of laser ablation plasma from graphite were studied. Laser plasma was produced on a rotated graphite target by fundamental harmonic of YAG: Nd3+ laser (Lotis TII) in air at atmospheric pressure. The optical emission spectra were analyzed using a GSM850 Lotis TII monochromator/spectrograph equipped with a CCD detector. The atomic and molecular spectra in the region of emission of molecules C2 (λ = 516,52 nm) and CN (λ = 421,16 nm) were registered by photomultiplier placed behind the interference filter to record the intensity of the selected plasma emission line. The temporal and spatial characteristics of the plasma spectra with special attention to molecular carbon including molecules СN and С2 were analyzed. It was found that the time range of dominance of the C2 and CN emission is related to the stage of the plasma decay (10–20 μs after the action of the laser pulse, depending on the conditions for plasma creating). The atomic emission spectra of the plasma were used to estimate the concentration of electrons and the electron temperature of the plasma. The vibrational temperature of the carbon plasma was determined from the molecular spectrum of the radical СN ((∆ν = 0, -1). The plasma electron concentration and electron temperature as well as vibrational temperature were determined in different zones of the expanding plasma and at different values of laser power densities (2,2·108 ÷ 3,7·108 W/cm2 ) used in experiments. The electron temperature varied in the range 9700 – 10300 K, the electron concentration was estimated to be in the range from 0,8·1018 cm-3 to 8,0·1018 cm-3 , the vibrational temperature of the plasma was 4560 - 7350 K depending on the experimental conditions (laser power density, spatial zone of the plasma plume).",
publisher = "Belgrade : Institute of Physics Belgrade",
journal = "PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade",
title = "Time-spatial resolved LIBS of atomic and molecular carbon in laser ablation plasma",
pages = "135",
url = "https://hdl.handle.net/21.15107/rcub_vinar_10911"
}

Nevar, A., Nedelko, M., Radomzev, A., Tarasenko, N., Savović, J., Kuzmanović, M. M.,& Ranković, D.. (2021). Time-spatial resolved LIBS of atomic and molecular carbon in laser ablation plasma. in PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade
Belgrade : Institute of Physics Belgrade., 135.
https://hdl.handle.net/21.15107/rcub_vinar_10911

Nevar A, Nedelko M, Radomzev A, Tarasenko N, Savović J, Kuzmanović MM, Ranković D. Time-spatial resolved LIBS of atomic and molecular carbon in laser ablation plasma. in PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade. 2021;:135.
https://hdl.handle.net/21.15107/rcub_vinar_10911 .

Nevar, A., Nedelko, M., Radomzev, A., Tarasenko, N., Savović, Jelena, Kuzmanović, Miroslav M., Ranković, D., "Time-spatial resolved LIBS of atomic and molecular carbon in laser ablation plasma" in PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade (2021):135,
https://hdl.handle.net/21.15107/rcub_vinar_10911 .

TY  - CONF
AU  - Kiris, V.
AU  - Nevar, A.
AU  - Tarasenka, N.
AU  - Tarasenko, N.
AU  - Kuzmanović, M.
AU  - Petrović, Jelena D.
AU  - Momčilović, Miloš
AU  - Savović, Jelena
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11885
AB  - Laser-induced breakdown spectroscopy (LIBS) is a diagnostic technique based on optical emission spectroscopy, suitable for rapid, in situ, and multi-element analysis of all sample types. LIBS has demonstrated its greatest potential in the analysis of solids, both conducting and nonconducting. However, when it comes to quantitative LIBS analysis of liquids, there are still some drawbacks that limit its applicability, such as poor repeatability and low sensitivity. To some extent LIBS performance may be improved if directly performing LIBS on the solution is avoided by converting the liquid into a solid phase. Another recently proposed method to resolve the difficulties in LIBS analysis of liquid samples is the application of Nanoparticle - Enhanced LIBS (NELIBS) [1,2]. The aim of the present work was to examine the effect of copper oxide nanoparticles (NPs) on the analytical capabilities of LIBS analysis of lead in aqueous solutions. The apparatus for NELIBS experiments comprises a laser source, a spectrograph (F=850 mm, grating 1800 groves/mm, F/11) coupled with a CCD, and the focusing and collecting optics, i.e. the same as used in conventional LIBS. A double pulse Q-switched Nd:YAG laser at 1064 nm, pulse duration 10 ns, pulse energy 50 mJ, interpulse delay 1 μs was used. The spectra were registered in a time-integrated mode (integration time 1 ms). A glass plate was chosen as the substrate to ensure there is no interference between NPs and the substrate. The first type of samples was prepared by drying a droplet of a Pb solution (10 μl, concentration 100 ppm) on the glass substrate. The second type was prepared by drying a droplet of the copper oxide colloidal solution on the glass, prior to the deposition of the analyte solution. Three sets of the LIBS spectra were acquired; spectra of glass with deposited CuO NPs, of glass with deposited sample solution of Pb, and of the glass with deposited NPs of CuO and the sample solution of Pb. The spectra were obtained in the 395-415 nm spectral range. Only in the third case, intense Pb lines appeared in the spectrum. Estimation of the limit of detection (LOD) for the resonance Pb line at 405.78 nm, without additional optimization of the measurement parameters, gave a value of 3.6 ppm. Regarding the fact that without the addition of the NPs layer no analyte signal was obtained, it can be concluded that the enhancement of the lead emission line intensity is caused by the presence of the NPs, i.e. by the lower plasma formation threshold and more efficient atomization of the analyte deposited on the NP layer. The main benefits of using NELIBS for the analysis of solutions lie in its simplicity, speed, the small amount of solution needed (few microliters), and the ability to analyze very dense or slurry samples.
PB  - Belgrade : Vinča Institute of Nuclear Sciences, University of Belgrade
C3  - PHOTONICA2019 : 7th International School and Conference on Photonics & Machine Learning with Photonics Symposium : Book of abstracts
T1  - The use of nanoparticles to improve the analytical capabilities of LIBS for solution sample analysis
SP  - 162
EP  - 162
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11885
ER  - 

@conference{
author = "Kiris, V. and Nevar, A. and Tarasenka, N. and Tarasenko, N. and Kuzmanović, M. and Petrović, Jelena D. and Momčilović, Miloš and Savović, Jelena",
year = "2019",
abstract = "Laser-induced breakdown spectroscopy (LIBS) is a diagnostic technique based on optical emission spectroscopy, suitable for rapid, in situ, and multi-element analysis of all sample types. LIBS has demonstrated its greatest potential in the analysis of solids, both conducting and nonconducting. However, when it comes to quantitative LIBS analysis of liquids, there are still some drawbacks that limit its applicability, such as poor repeatability and low sensitivity. To some extent LIBS performance may be improved if directly performing LIBS on the solution is avoided by converting the liquid into a solid phase. Another recently proposed method to resolve the difficulties in LIBS analysis of liquid samples is the application of Nanoparticle - Enhanced LIBS (NELIBS) [1,2]. The aim of the present work was to examine the effect of copper oxide nanoparticles (NPs) on the analytical capabilities of LIBS analysis of lead in aqueous solutions. The apparatus for NELIBS experiments comprises a laser source, a spectrograph (F=850 mm, grating 1800 groves/mm, F/11) coupled with a CCD, and the focusing and collecting optics, i.e. the same as used in conventional LIBS. A double pulse Q-switched Nd:YAG laser at 1064 nm, pulse duration 10 ns, pulse energy 50 mJ, interpulse delay 1 μs was used. The spectra were registered in a time-integrated mode (integration time 1 ms). A glass plate was chosen as the substrate to ensure there is no interference between NPs and the substrate. The first type of samples was prepared by drying a droplet of a Pb solution (10 μl, concentration 100 ppm) on the glass substrate. The second type was prepared by drying a droplet of the copper oxide colloidal solution on the glass, prior to the deposition of the analyte solution. Three sets of the LIBS spectra were acquired; spectra of glass with deposited CuO NPs, of glass with deposited sample solution of Pb, and of the glass with deposited NPs of CuO and the sample solution of Pb. The spectra were obtained in the 395-415 nm spectral range. Only in the third case, intense Pb lines appeared in the spectrum. Estimation of the limit of detection (LOD) for the resonance Pb line at 405.78 nm, without additional optimization of the measurement parameters, gave a value of 3.6 ppm. Regarding the fact that without the addition of the NPs layer no analyte signal was obtained, it can be concluded that the enhancement of the lead emission line intensity is caused by the presence of the NPs, i.e. by the lower plasma formation threshold and more efficient atomization of the analyte deposited on the NP layer. The main benefits of using NELIBS for the analysis of solutions lie in its simplicity, speed, the small amount of solution needed (few microliters), and the ability to analyze very dense or slurry samples.",
publisher = "Belgrade : Vinča Institute of Nuclear Sciences, University of Belgrade",
journal = "PHOTONICA2019 : 7th International School and Conference on Photonics & Machine Learning with Photonics Symposium : Book of abstracts",
title = "The use of nanoparticles to improve the analytical capabilities of LIBS for solution sample analysis",
pages = "162-162",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11885"
}

Kiris, V., Nevar, A., Tarasenka, N., Tarasenko, N., Kuzmanović, M., Petrović, J. D., Momčilović, M.,& Savović, J.. (2019). The use of nanoparticles to improve the analytical capabilities of LIBS for solution sample analysis. in PHOTONICA2019 : 7th International School and Conference on Photonics & Machine Learning with Photonics Symposium : Book of abstracts
Belgrade : Vinča Institute of Nuclear Sciences, University of Belgrade., 162-162.
https://hdl.handle.net/21.15107/rcub_vinar_11885

Kiris V, Nevar A, Tarasenka N, Tarasenko N, Kuzmanović M, Petrović JD, Momčilović M, Savović J. The use of nanoparticles to improve the analytical capabilities of LIBS for solution sample analysis. in PHOTONICA2019 : 7th International School and Conference on Photonics & Machine Learning with Photonics Symposium : Book of abstracts. 2019;:162-162.
https://hdl.handle.net/21.15107/rcub_vinar_11885 .

Kiris, V., Nevar, A., Tarasenka, N., Tarasenko, N., Kuzmanović, M., Petrović, Jelena D., Momčilović, Miloš, Savović, Jelena, "The use of nanoparticles to improve the analytical capabilities of LIBS for solution sample analysis" in PHOTONICA2019 : 7th International School and Conference on Photonics & Machine Learning with Photonics Symposium : Book of abstracts (2019):162-162,
https://hdl.handle.net/21.15107/rcub_vinar_11885 .