TY  - JOUR
AU  - Đurišić, Ivana
AU  - Dražić, Miloš S.
AU  - Tomović, Aleksandar Ž.
AU  - Spasenović, Marko
AU  - Šljivančanin, Željko
AU  - Jovanović, Vladimir P.
AU  - Zikić, Radomir
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9780
AB  - Functionalization of electrodes is a wide‐used strategy in various applications ranging from single‐molecule sensing and protein sequencing, to ion trapping, to desalination. We demonstrate, employing non‐equilibrium Green′s function formalism combined with density functional theory, that single‐species (N, H, S, Cl, F) termination of graphene nanogap electrodes results in a strong in‐gap electrostatic field, induced by species‐dependent dipoles formed at the electrode ends. Consequently, the field increases or decreases electronic transport through a molecule (benzene) placed in the nanogap by shifting molecular levels by almost 2 eV in respect to the electrode Fermi level via a field effect akin to the one used for field‐effect transistors. We also observed the local gating in graphene nanopores terminated with different single‐species atoms. Nitrogen‐terminated nanogaps (NtNGs) and nanopores (NtNPs) show the strongest effect. The in‐gap potential can be transformed from a plateau‐like to a saddle‐like shape by tailoring NtNG and NtNP size and termination type. In particular, the saddle‐like potential is applicable in single‐ion trapping and desalination devices.
T2  - ChemPhysChem
T1  - Field Effect and Local Gating in Nitrogen‐Terminated Nanopores (NtNP) and Nanogaps (NtNG) in Graphene
VL  - 22
SP  - 336
EP  - 341
DO  - 10.1002/cphc.202000771
ER  - 

@article{
author = "Đurišić, Ivana and Dražić, Miloš S. and Tomović, Aleksandar Ž. and Spasenović, Marko and Šljivančanin, Željko and Jovanović, Vladimir P. and Zikić, Radomir",
year = "2021",
abstract = "Functionalization of electrodes is a wide‐used strategy in various applications ranging from single‐molecule sensing and protein sequencing, to ion trapping, to desalination. We demonstrate, employing non‐equilibrium Green′s function formalism combined with density functional theory, that single‐species (N, H, S, Cl, F) termination of graphene nanogap electrodes results in a strong in‐gap electrostatic field, induced by species‐dependent dipoles formed at the electrode ends. Consequently, the field increases or decreases electronic transport through a molecule (benzene) placed in the nanogap by shifting molecular levels by almost 2 eV in respect to the electrode Fermi level via a field effect akin to the one used for field‐effect transistors. We also observed the local gating in graphene nanopores terminated with different single‐species atoms. Nitrogen‐terminated nanogaps (NtNGs) and nanopores (NtNPs) show the strongest effect. The in‐gap potential can be transformed from a plateau‐like to a saddle‐like shape by tailoring NtNG and NtNP size and termination type. In particular, the saddle‐like potential is applicable in single‐ion trapping and desalination devices.",
journal = "ChemPhysChem",
title = "Field Effect and Local Gating in Nitrogen‐Terminated Nanopores (NtNP) and Nanogaps (NtNG) in Graphene",
volume = "22",
pages = "336-341",
doi = "10.1002/cphc.202000771"
}

Đurišić, I., Dražić, M. S., Tomović, A. Ž., Spasenović, M., Šljivančanin, Ž., Jovanović, V. P.,& Zikić, R.. (2021). Field Effect and Local Gating in Nitrogen‐Terminated Nanopores (NtNP) and Nanogaps (NtNG) in Graphene. in ChemPhysChem, 22, 336-341.
https://doi.org/10.1002/cphc.202000771

Đurišić I, Dražić MS, Tomović AŽ, Spasenović M, Šljivančanin Ž, Jovanović VP, Zikić R. Field Effect and Local Gating in Nitrogen‐Terminated Nanopores (NtNP) and Nanogaps (NtNG) in Graphene. in ChemPhysChem. 2021;22:336-341.
doi:10.1002/cphc.202000771 .

Đurišić, Ivana, Dražić, Miloš S., Tomović, Aleksandar Ž., Spasenović, Marko, Šljivančanin, Željko, Jovanović, Vladimir P., Zikić, Radomir, "Field Effect and Local Gating in Nitrogen‐Terminated Nanopores (NtNP) and Nanogaps (NtNG) in Graphene" in ChemPhysChem, 22 (2021):336-341,
https://doi.org/10.1002/cphc.202000771 . .

TY  - JOUR
AU  - Đurišić, Ivana
AU  - Dražić, Miloš S.
AU  - Tomović, Aleksandar Ž.
AU  - Spasenović, Marko
AU  - Šljivančanin, Željko
AU  - Jovanović, Vladimir P.
AU  - Žikić, Radomir
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9097
AB  - Fast, reliable, and inexpensive DNA sequencing is an important pursuit in healthcare, especially in personalized medicine with possible deep societal impacts. Despite significant progress in various nanopore-based sequencing configurations, challenges that remain in resolution and chromosome-size-long readout call for new approaches. Here we found strong rectification in the transversal current during single-stranded DNA translocation through a nanopore with side-embedded N-terminated carbon nanotube electrodes. Employing density functional theory and nonequilibrium Green’s function formalisms, we show that the rectifying ratio (response to square pulses of alternating bias) bears high nucleobase specificity. Rectification arises because of bias-dependent resistance asymmetry on the deoxyribonucleotide−electrode interfaces. The asymmetry induces molecular charging and highest occupied molecular orbital pinning to the electrochemical potential of one of the electrodes, assisted by an in-gap electric-field effect caused by dipoles at the terminated electrode ends. We propose the rectifying ratio, due to its order-of-magnitude-difference nucleobase selectivity and robustness to electrode-molecule orientation, as a promising readout quantifier for single-base resolution and chromosome-size-long single-read DNA sequencing. The proposed configurations are within experimental reach from the viewpoint of both nanofabrication and small current measurement.
T2  - ACS Applied Nano Materials
T1  - DNA Sequencing with Single-Stranded DNA Rectification in a Nanogap Gated by N‑Terminated Carbon Nanotube Electrodes
VL  - 3
IS  - 3
SP  - 3034
EP  - 3043
DO  - 10.1021/acsanm.0c00385
ER  - 

@article{
author = "Đurišić, Ivana and Dražić, Miloš S. and Tomović, Aleksandar Ž. and Spasenović, Marko and Šljivančanin, Željko and Jovanović, Vladimir P. and Žikić, Radomir",
year = "2020",
abstract = "Fast, reliable, and inexpensive DNA sequencing is an important pursuit in healthcare, especially in personalized medicine with possible deep societal impacts. Despite significant progress in various nanopore-based sequencing configurations, challenges that remain in resolution and chromosome-size-long readout call for new approaches. Here we found strong rectification in the transversal current during single-stranded DNA translocation through a nanopore with side-embedded N-terminated carbon nanotube electrodes. Employing density functional theory and nonequilibrium Green’s function formalisms, we show that the rectifying ratio (response to square pulses of alternating bias) bears high nucleobase specificity. Rectification arises because of bias-dependent resistance asymmetry on the deoxyribonucleotide−electrode interfaces. The asymmetry induces molecular charging and highest occupied molecular orbital pinning to the electrochemical potential of one of the electrodes, assisted by an in-gap electric-field effect caused by dipoles at the terminated electrode ends. We propose the rectifying ratio, due to its order-of-magnitude-difference nucleobase selectivity and robustness to electrode-molecule orientation, as a promising readout quantifier for single-base resolution and chromosome-size-long single-read DNA sequencing. The proposed configurations are within experimental reach from the viewpoint of both nanofabrication and small current measurement.",
journal = "ACS Applied Nano Materials",
title = "DNA Sequencing with Single-Stranded DNA Rectification in a Nanogap Gated by N‑Terminated Carbon Nanotube Electrodes",
volume = "3",
number = "3",
pages = "3034-3043",
doi = "10.1021/acsanm.0c00385"
}

Đurišić, I., Dražić, M. S., Tomović, A. Ž., Spasenović, M., Šljivančanin, Ž., Jovanović, V. P.,& Žikić, R.. (2020). DNA Sequencing with Single-Stranded DNA Rectification in a Nanogap Gated by N‑Terminated Carbon Nanotube Electrodes. in ACS Applied Nano Materials, 3(3), 3034-3043.
https://doi.org/10.1021/acsanm.0c00385

Đurišić I, Dražić MS, Tomović AŽ, Spasenović M, Šljivančanin Ž, Jovanović VP, Žikić R. DNA Sequencing with Single-Stranded DNA Rectification in a Nanogap Gated by N‑Terminated Carbon Nanotube Electrodes. in ACS Applied Nano Materials. 2020;3(3):3034-3043.
doi:10.1021/acsanm.0c00385 .

Đurišić, Ivana, Dražić, Miloš S., Tomović, Aleksandar Ž., Spasenović, Marko, Šljivančanin, Željko, Jovanović, Vladimir P., Žikić, Radomir, "DNA Sequencing with Single-Stranded DNA Rectification in a Nanogap Gated by N‑Terminated Carbon Nanotube Electrodes" in ACS Applied Nano Materials, 3, no. 3 (2020):3034-3043,
https://doi.org/10.1021/acsanm.0c00385 . .

TY  - JOUR
AU  - Tomovic, A. Z.
AU  - Jovanovic, V. P.
AU  - Durisic, I.
AU  - Cerovski, V. Z.
AU  - Nastasijević, Branislav J.
AU  - Veielovic, S. R.
AU  - Radulovic, K.
AU  - Žikić, Radomir
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/738
AB  - The photoluminescence (PL) quenching mechanism of UV light and air-exposed amorphous thin films of 4,4-bis(2,2-diphenylvinyl)-1,1-biphenyl (DPVBi), a well-known hole-transport material used in organic light-emitting diodes, is studied. Thin films of DPVBi are stable when exposed to UV light in vacuum but tend to degrade if oxygen is present simultaneously. This is evident from the changes in UV-vis absorption spectra of the latter, showing that degradation rate of DPVBi films is linearly proportional to both oxygen concentration and UV light intensity. Mass spectrometry study of such films revealed a number of different oxygen-containing molecules and fragments of DPVBi thus confirming apparent photo-oxidation process. Also, DFT study of molecular DPVBi with and without oxygen was carried out, the IR spectra calculated for the lowest energy molecules found and the results are compared with the experiment. The most sensitive to photo-oxidation is DPVBi photoluminescence, which decays exponentially with respect to the concentration of photo-oxidized DPVBi molecules (impurities). The PL quantum yield of DPVBi thin film drops to a half of its original value for 0.2% of the impurities present, at which point an average distance between DPVBi molecules (the donors) and photo-oxidized DPVBi species (acceptors) is an order of magnitude larger than the separation between two adjacent molecules. This implies a need for a long-range Forster energy transfer, which we rule out based on the lack of a donor-acceptor spectral overlap. The apparent discrepancy can be removed by postulating exciton self-diffusion in DPVBi thin films, for which there is supporting evidence in existing literature. (C) 2015 Elsevier B.V. All rights reserved.
T2  - Journal of Luminescence
T1  - Fast photoluminescence quenching in thin films of 4,4 -bis(2,2-diphenylvinyl)-1,1 -biphenyl exposed to air
VL  - 167
SP  - 204
EP  - 210
DO  - 10.1016/j.jlumin.2015.06.036
ER  - 

@article{
author = "Tomovic, A. Z. and Jovanovic, V. P. and Durisic, I. and Cerovski, V. Z. and Nastasijević, Branislav J. and Veielovic, S. R. and Radulovic, K. and Žikić, Radomir",
year = "2015",
abstract = "The photoluminescence (PL) quenching mechanism of UV light and air-exposed amorphous thin films of 4,4-bis(2,2-diphenylvinyl)-1,1-biphenyl (DPVBi), a well-known hole-transport material used in organic light-emitting diodes, is studied. Thin films of DPVBi are stable when exposed to UV light in vacuum but tend to degrade if oxygen is present simultaneously. This is evident from the changes in UV-vis absorption spectra of the latter, showing that degradation rate of DPVBi films is linearly proportional to both oxygen concentration and UV light intensity. Mass spectrometry study of such films revealed a number of different oxygen-containing molecules and fragments of DPVBi thus confirming apparent photo-oxidation process. Also, DFT study of molecular DPVBi with and without oxygen was carried out, the IR spectra calculated for the lowest energy molecules found and the results are compared with the experiment. The most sensitive to photo-oxidation is DPVBi photoluminescence, which decays exponentially with respect to the concentration of photo-oxidized DPVBi molecules (impurities). The PL quantum yield of DPVBi thin film drops to a half of its original value for 0.2% of the impurities present, at which point an average distance between DPVBi molecules (the donors) and photo-oxidized DPVBi species (acceptors) is an order of magnitude larger than the separation between two adjacent molecules. This implies a need for a long-range Forster energy transfer, which we rule out based on the lack of a donor-acceptor spectral overlap. The apparent discrepancy can be removed by postulating exciton self-diffusion in DPVBi thin films, for which there is supporting evidence in existing literature. (C) 2015 Elsevier B.V. All rights reserved.",
journal = "Journal of Luminescence",
title = "Fast photoluminescence quenching in thin films of 4,4 -bis(2,2-diphenylvinyl)-1,1 -biphenyl exposed to air",
volume = "167",
pages = "204-210",
doi = "10.1016/j.jlumin.2015.06.036"
}

Tomovic, A. Z., Jovanovic, V. P., Durisic, I., Cerovski, V. Z., Nastasijević, B. J., Veielovic, S. R., Radulovic, K.,& Žikić, R.. (2015). Fast photoluminescence quenching in thin films of 4,4 -bis(2,2-diphenylvinyl)-1,1 -biphenyl exposed to air. in Journal of Luminescence, 167, 204-210.
https://doi.org/10.1016/j.jlumin.2015.06.036

Tomovic AZ, Jovanovic VP, Durisic I, Cerovski VZ, Nastasijević BJ, Veielovic SR, Radulovic K, Žikić R. Fast photoluminescence quenching in thin films of 4,4 -bis(2,2-diphenylvinyl)-1,1 -biphenyl exposed to air. in Journal of Luminescence. 2015;167:204-210.
doi:10.1016/j.jlumin.2015.06.036 .

Tomovic, A. Z., Jovanovic, V. P., Durisic, I., Cerovski, V. Z., Nastasijević, Branislav J., Veielovic, S. R., Radulovic, K., Žikić, Radomir, "Fast photoluminescence quenching in thin films of 4,4 -bis(2,2-diphenylvinyl)-1,1 -biphenyl exposed to air" in Journal of Luminescence, 167 (2015):204-210,
https://doi.org/10.1016/j.jlumin.2015.06.036 . .

TY  - CONF
AU  - Nastasijević, Branislav J.
AU  - Tomović, Aleksandar Ž.
AU  - Jovanović, Vladimir P.
AU  - Žikić, Radomir
AU  - Veličković, Suzana
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9260
AB  - An Atmospheric pressure Solids Analysis Probe (ASAP) mass spectrometer
are used for investigation the ionization mechanism and fragmentation
pathways of 4,4′-bis(2,2′diphenyl vinyl)-1,1′-biphenyl (DPVBi). DPVBi is
material used in OLEDs (organic light-emitting diode). Results obtained
indicate that by controlling ion source conditions it is possible to optimize
forming of desired precursor ion, primarily radical cation and in less content
protonated ion of DPVBi. The results presented illustrate the usefulness of
ASAP MS in the characterization of DPVBi compounds.
PB  - Society of Physical Chemists of Serbia
C3  - Physical chemistry 2014: 12th International Conference on Fundamental and Applied Aspects of Physical Chemistry
T1  - Analysis of 4,4′-bis(2,2′diphenyl vinyl)-1,1′- biphenyl using the atmospheric-pressure solids analysis probe for ionization
VL  - 1063
EP  - 1066
UR  - https://hdl.handle.net/21.15107/rcub_vinar_9260
ER  - 

@conference{
author = "Nastasijević, Branislav J. and Tomović, Aleksandar Ž. and Jovanović, Vladimir P. and Žikić, Radomir and Veličković, Suzana",
year = "2014",
abstract = "An Atmospheric pressure Solids Analysis Probe (ASAP) mass spectrometer
are used for investigation the ionization mechanism and fragmentation
pathways of 4,4′-bis(2,2′diphenyl vinyl)-1,1′-biphenyl (DPVBi). DPVBi is
material used in OLEDs (organic light-emitting diode). Results obtained
indicate that by controlling ion source conditions it is possible to optimize
forming of desired precursor ion, primarily radical cation and in less content
protonated ion of DPVBi. The results presented illustrate the usefulness of
ASAP MS in the characterization of DPVBi compounds.",
publisher = "Society of Physical Chemists of Serbia",
journal = "Physical chemistry 2014: 12th International Conference on Fundamental and Applied Aspects of Physical Chemistry",
title = "Analysis of 4,4′-bis(2,2′diphenyl vinyl)-1,1′- biphenyl using the atmospheric-pressure solids analysis probe for ionization",
volume = "1063",
pages = "1066",
url = "https://hdl.handle.net/21.15107/rcub_vinar_9260"
}

Nastasijević, B. J., Tomović, A. Ž., Jovanović, V. P., Žikić, R.,& Veličković, S.. (2014). Analysis of 4,4′-bis(2,2′diphenyl vinyl)-1,1′- biphenyl using the atmospheric-pressure solids analysis probe for ionization. in Physical chemistry 2014: 12th International Conference on Fundamental and Applied Aspects of Physical Chemistry
Society of Physical Chemists of Serbia., 1063.
https://hdl.handle.net/21.15107/rcub_vinar_9260

Nastasijević BJ, Tomović AŽ, Jovanović VP, Žikić R, Veličković S. Analysis of 4,4′-bis(2,2′diphenyl vinyl)-1,1′- biphenyl using the atmospheric-pressure solids analysis probe for ionization. in Physical chemistry 2014: 12th International Conference on Fundamental and Applied Aspects of Physical Chemistry. 2014;1063:null-1066.
https://hdl.handle.net/21.15107/rcub_vinar_9260 .

Nastasijević, Branislav J., Tomović, Aleksandar Ž., Jovanović, Vladimir P., Žikić, Radomir, Veličković, Suzana, "Analysis of 4,4′-bis(2,2′diphenyl vinyl)-1,1′- biphenyl using the atmospheric-pressure solids analysis probe for ionization" in Physical chemistry 2014: 12th International Conference on Fundamental and Applied Aspects of Physical Chemistry, 1063 (2014),
https://hdl.handle.net/21.15107/rcub_vinar_9260 .

TY  - JOUR
AU  - Božanić, Dušan K.
AU  - Ivković, Milivoje R.
AU  - Bibić, Nataša M.
AU  - Hegewald, J.
AU  - Pionteck, J.
AU  - Žikić, Radomir
AU  - Đoković, Vladimir
PY  - 2010
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3989
AB  - Densely packed gold nanoparticles with narrow size distribution were fabricated by pulsed laser deposition using a blend of amino-terminated polystyrene (PS-NH2) and carboxyl-terminated polymethylmethacrylate (PMMA-COOH) as a deposition substrate. Transmission electron microscopy showed spherical Au nanoparticles with an average size of 5 nm. UV-vis absorption spectra of the Au/blend nanocomposite films exhibited a strong resonance band at 658 nm. The analyses of the spectrum using the effective medium Bergman theory showed that the nanocomposite is comprised of isolated and randomly arranged nanoparticles. (C) 2010 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim
T2  - Physica Status Solidi - Rapid Research Letters
T1  - PS-NH2 + PMMA-COOH blend: A promising substrate material for the deposition of densely packed gold nanoparticles
VL  - 4
IS  - 3-4
SP  - 85
EP  - 87
DO  - 10.1002/pssr.201004046
ER  - 

@article{
author = "Božanić, Dušan K. and Ivković, Milivoje R. and Bibić, Nataša M. and Hegewald, J. and Pionteck, J. and Žikić, Radomir and Đoković, Vladimir",
year = "2010",
abstract = "Densely packed gold nanoparticles with narrow size distribution were fabricated by pulsed laser deposition using a blend of amino-terminated polystyrene (PS-NH2) and carboxyl-terminated polymethylmethacrylate (PMMA-COOH) as a deposition substrate. Transmission electron microscopy showed spherical Au nanoparticles with an average size of 5 nm. UV-vis absorption spectra of the Au/blend nanocomposite films exhibited a strong resonance band at 658 nm. The analyses of the spectrum using the effective medium Bergman theory showed that the nanocomposite is comprised of isolated and randomly arranged nanoparticles. (C) 2010 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim",
journal = "Physica Status Solidi - Rapid Research Letters",
title = "PS-NH2 + PMMA-COOH blend: A promising substrate material for the deposition of densely packed gold nanoparticles",
volume = "4",
number = "3-4",
pages = "85-87",
doi = "10.1002/pssr.201004046"
}

Božanić, D. K., Ivković, M. R., Bibić, N. M., Hegewald, J., Pionteck, J., Žikić, R.,& Đoković, V.. (2010). PS-NH2 + PMMA-COOH blend: A promising substrate material for the deposition of densely packed gold nanoparticles. in Physica Status Solidi - Rapid Research Letters, 4(3-4), 85-87.
https://doi.org/10.1002/pssr.201004046

Božanić DK, Ivković MR, Bibić NM, Hegewald J, Pionteck J, Žikić R, Đoković V. PS-NH2 + PMMA-COOH blend: A promising substrate material for the deposition of densely packed gold nanoparticles. in Physica Status Solidi - Rapid Research Letters. 2010;4(3-4):85-87.
doi:10.1002/pssr.201004046 .

Božanić, Dušan K., Ivković, Milivoje R., Bibić, Nataša M., Hegewald, J., Pionteck, J., Žikić, Radomir, Đoković, Vladimir, "PS-NH2 + PMMA-COOH blend: A promising substrate material for the deposition of densely packed gold nanoparticles" in Physica Status Solidi - Rapid Research Letters, 4, no. 3-4 (2010):85-87,
https://doi.org/10.1002/pssr.201004046 . .