TY  - JOUR
AU  - Đokić, Veljko
AU  - Marinković, Aleksandar
AU  - Petrović, Rada
AU  - Ersen, Ovidiu
AU  - Zafeiratos, Spyridon
AU  - Mitrić, Miodrag
AU  - Ophus, Colin
AU  - Radmilović, Velimir R.
AU  - Janaćković, Đorđe
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4470
AB  - The controllable synthesis of rutile TiO2 single crystal particles with the preferential orientation of {111} facets still remains a scientific and technological challenge. Here, we developed a facile route for fabrication of rutile TiO2 nanorod crystals (RTiO(2)NRs) having high ratios of oxidative {111} to reductive {110} surfaces. RTiO(2)NRs were synthesized using a peroxo-titanium complex (PTC) approach, which was controlled by changing the Ti/H2O2 ratio. The thus obtained RTiO(2)NRs revealed a high tendency to agglomerate through orientation-dependent attachment along the {110} facets. This resulted in an increased {111}/{110} surface ratio and led to a markedly improved photocatalytic activity of RTiO2NR aggregates. The reported findings illustrate the rich potential of the herein proposed facile and energy-efficient synthesis of nanostructured rutile TiO2-based photocatalysts.
PB  - Amer Chemical Soc, Washington
T2  - ACS Applied Materials & Interfaces
T1  - Highly Active Rutile TiO2 Nanocrystalline Photocatalysts
EP  - 33068
IS  - 29
SP  - 33058
VL  - 12
DO  - 10.1021/acsami.0c03150
ER  - 

@article{
author = "Đokić, Veljko and Marinković, Aleksandar and Petrović, Rada and Ersen, Ovidiu and Zafeiratos, Spyridon and Mitrić, Miodrag and Ophus, Colin and Radmilović, Velimir R. and Janaćković, Đorđe",
year = "2020",
abstract = "The controllable synthesis of rutile TiO2 single crystal particles with the preferential orientation of {111} facets still remains a scientific and technological challenge. Here, we developed a facile route for fabrication of rutile TiO2 nanorod crystals (RTiO(2)NRs) having high ratios of oxidative {111} to reductive {110} surfaces. RTiO(2)NRs were synthesized using a peroxo-titanium complex (PTC) approach, which was controlled by changing the Ti/H2O2 ratio. The thus obtained RTiO(2)NRs revealed a high tendency to agglomerate through orientation-dependent attachment along the {110} facets. This resulted in an increased {111}/{110} surface ratio and led to a markedly improved photocatalytic activity of RTiO2NR aggregates. The reported findings illustrate the rich potential of the herein proposed facile and energy-efficient synthesis of nanostructured rutile TiO2-based photocatalysts.",
publisher = "Amer Chemical Soc, Washington",
journal = "ACS Applied Materials & Interfaces",
title = "Highly Active Rutile TiO2 Nanocrystalline Photocatalysts",
pages = "33068-33058",
number = "29",
volume = "12",
doi = "10.1021/acsami.0c03150"
}

Đokić, V., Marinković, A., Petrović, R., Ersen, O., Zafeiratos, S., Mitrić, M., Ophus, C., Radmilović, V. R.,& Janaćković, Đ.. (2020). Highly Active Rutile TiO2 Nanocrystalline Photocatalysts. in ACS Applied Materials & Interfaces
Amer Chemical Soc, Washington., 12(29), 33058-33068.
https://doi.org/10.1021/acsami.0c03150

Đokić V, Marinković A, Petrović R, Ersen O, Zafeiratos S, Mitrić M, Ophus C, Radmilović VR, Janaćković Đ. Highly Active Rutile TiO2 Nanocrystalline Photocatalysts. in ACS Applied Materials & Interfaces. 2020;12(29):33058-33068.
doi:10.1021/acsami.0c03150 .

Đokić, Veljko, Marinković, Aleksandar, Petrović, Rada, Ersen, Ovidiu, Zafeiratos, Spyridon, Mitrić, Miodrag, Ophus, Colin, Radmilović, Velimir R., Janaćković, Đorđe, "Highly Active Rutile TiO2 Nanocrystalline Photocatalysts" in ACS Applied Materials & Interfaces, 12, no. 29 (2020):33058-33068,
https://doi.org/10.1021/acsami.0c03150 . .

TY  - JOUR
AU  - Radmilović, Vuk
AU  - Goebelt, Manuela
AU  - Ophus, Colin
AU  - Christiansen, Silke
AU  - Spiecker, Erdmann
AU  - Radmilović, Velimir R.
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3633
AB  - This article focuses on the microscopic mechanism of thermally induced nanoweld formation between silver nanowires (AgNWs) which is a key process for improving electrical conductivity in NW networks employed for transparent electrodes. Focused ion beam sectioning and transmission electron microscopy were applied in order to elucidate the atomic structure of a welded NW including measurement of the wetting contact angle and characterization of defect structure with atomic accuracy, which provides fundamental information on the welding mechanism. Crystal lattice strain, obtained by direct evaluation of atomic column displacements in high resolution scanning transmission electron microscopy images, was shown to be non-uniform among the five twin segments of the AgNW pentagonal structure. It was found that the pentagonal cross-sectional morphology of AgNWs has a dominant effect on the formation of nanowelds by controlling initial wetting as well as diffusion of Ag atoms between the NWs. Due to complete solid-state wetting, at an angle of similar to 4.8 degrees, the welding process starts with homoepitaxial nucleation of an initial Ag layer on (100) surface facets, considered to have an infinitely large radius of curvature. However, the strong driving force for this process due to the Gibbs-Thomson effect, requires the NW contact to occur through the corner of the pentagonal cross-section of the second NW providing a small radius of curvature. After the initial layer is formed, the welded zone continues to grow and extends out epitaxially to the neighboring twin segments.
PB  - IOP Publishing Ltd, Bristol
T2  - Nanotechnology
T1  - Low temperature solid-state wetting and formation of nanowelds in silver nanowires
IS  - 38
VL  - 28
DO  - 10.1088/1361-6528/aa7eb8
ER  - 

@article{
author = "Radmilović, Vuk and Goebelt, Manuela and Ophus, Colin and Christiansen, Silke and Spiecker, Erdmann and Radmilović, Velimir R.",
year = "2017",
abstract = "This article focuses on the microscopic mechanism of thermally induced nanoweld formation between silver nanowires (AgNWs) which is a key process for improving electrical conductivity in NW networks employed for transparent electrodes. Focused ion beam sectioning and transmission electron microscopy were applied in order to elucidate the atomic structure of a welded NW including measurement of the wetting contact angle and characterization of defect structure with atomic accuracy, which provides fundamental information on the welding mechanism. Crystal lattice strain, obtained by direct evaluation of atomic column displacements in high resolution scanning transmission electron microscopy images, was shown to be non-uniform among the five twin segments of the AgNW pentagonal structure. It was found that the pentagonal cross-sectional morphology of AgNWs has a dominant effect on the formation of nanowelds by controlling initial wetting as well as diffusion of Ag atoms between the NWs. Due to complete solid-state wetting, at an angle of similar to 4.8 degrees, the welding process starts with homoepitaxial nucleation of an initial Ag layer on (100) surface facets, considered to have an infinitely large radius of curvature. However, the strong driving force for this process due to the Gibbs-Thomson effect, requires the NW contact to occur through the corner of the pentagonal cross-section of the second NW providing a small radius of curvature. After the initial layer is formed, the welded zone continues to grow and extends out epitaxially to the neighboring twin segments.",
publisher = "IOP Publishing Ltd, Bristol",
journal = "Nanotechnology",
title = "Low temperature solid-state wetting and formation of nanowelds in silver nanowires",
number = "38",
volume = "28",
doi = "10.1088/1361-6528/aa7eb8"
}

Radmilović, V., Goebelt, M., Ophus, C., Christiansen, S., Spiecker, E.,& Radmilović, V. R.. (2017). Low temperature solid-state wetting and formation of nanowelds in silver nanowires. in Nanotechnology
IOP Publishing Ltd, Bristol., 28(38).
https://doi.org/10.1088/1361-6528/aa7eb8

Radmilović V, Goebelt M, Ophus C, Christiansen S, Spiecker E, Radmilović VR. Low temperature solid-state wetting and formation of nanowelds in silver nanowires. in Nanotechnology. 2017;28(38).
doi:10.1088/1361-6528/aa7eb8 .

Radmilović, Vuk, Goebelt, Manuela, Ophus, Colin, Christiansen, Silke, Spiecker, Erdmann, Radmilović, Velimir R., "Low temperature solid-state wetting and formation of nanowelds in silver nanowires" in Nanotechnology, 28, no. 38 (2017),
https://doi.org/10.1088/1361-6528/aa7eb8 . .

TY  - JOUR
AU  - Radetić, Tamara
AU  - Ophus, Colin
AU  - Olmsted, D. L.
AU  - Asta, M.
AU  - Dahmen, U.
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2150
AB  - This work investigates the mechanism and dynamics of grain boundary migration driven by capillary forces via in situ electron microscopy, complemented by molecular-dynamics simulations. Using thin films of Au with the mazed bicrystal geometry, the shrinkage of island grains with 90 degrees  lt  110  gt  tilt grain boundaries was observed by diffraction contrast and high-resolution imaging. The grains remained cylindrical throughout the shrinkage, and there was no measurable grain rotation even at very small sizes. The rate of shrinkage was found to be erratic and inconsistent with parabolic kinetics, accelerating before complete disappearance. Residual defects were found immediately after complete shrinkage, although the type and magnitude of the defects varied from grain to grain. Measurement of the grain boundary shape anisotropy showed a preference for facets on low-index planes of the crystals, including the mirror-symmetry planes of the bicrystal. These facets were also found directly on individual images extracted from high-resolution video recordings of shrinking grains at similar to 300 degrees C. The dynamics of boundary motion were found to be limited by nucleation and propagation of steps on these facets. The cylindrical geometry and size of the experimentally observed island grains allow direct comparison with molecular-dynamics simulations on the same length scale, which reproduced many of the experimentally observed features, including non-parabolic shrinkage, absence of systematic grain rotation, step-controlled migration and dislocation debris after complete grain shrinkage. Differences between model and experiment are discussed in terms of the possible role of impurities, surfaces and interfacial steps.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Acta Materialia
T1  - Mechanism and dynamics of shrinking island grains in mazed bicrystal thin films of Au
EP  - 7063
IS  - 20
SP  - 7051
VL  - 60
DO  - 10.1016/j.actamat.2012.09.012
ER  - 

@article{
author = "Radetić, Tamara and Ophus, Colin and Olmsted, D. L. and Asta, M. and Dahmen, U.",
year = "2012",
abstract = "This work investigates the mechanism and dynamics of grain boundary migration driven by capillary forces via in situ electron microscopy, complemented by molecular-dynamics simulations. Using thin films of Au with the mazed bicrystal geometry, the shrinkage of island grains with 90 degrees  lt  110  gt  tilt grain boundaries was observed by diffraction contrast and high-resolution imaging. The grains remained cylindrical throughout the shrinkage, and there was no measurable grain rotation even at very small sizes. The rate of shrinkage was found to be erratic and inconsistent with parabolic kinetics, accelerating before complete disappearance. Residual defects were found immediately after complete shrinkage, although the type and magnitude of the defects varied from grain to grain. Measurement of the grain boundary shape anisotropy showed a preference for facets on low-index planes of the crystals, including the mirror-symmetry planes of the bicrystal. These facets were also found directly on individual images extracted from high-resolution video recordings of shrinking grains at similar to 300 degrees C. The dynamics of boundary motion were found to be limited by nucleation and propagation of steps on these facets. The cylindrical geometry and size of the experimentally observed island grains allow direct comparison with molecular-dynamics simulations on the same length scale, which reproduced many of the experimentally observed features, including non-parabolic shrinkage, absence of systematic grain rotation, step-controlled migration and dislocation debris after complete grain shrinkage. Differences between model and experiment are discussed in terms of the possible role of impurities, surfaces and interfacial steps.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Acta Materialia",
title = "Mechanism and dynamics of shrinking island grains in mazed bicrystal thin films of Au",
pages = "7063-7051",
number = "20",
volume = "60",
doi = "10.1016/j.actamat.2012.09.012"
}

Radetić, T., Ophus, C., Olmsted, D. L., Asta, M.,& Dahmen, U.. (2012). Mechanism and dynamics of shrinking island grains in mazed bicrystal thin films of Au. in Acta Materialia
Pergamon-Elsevier Science Ltd, Oxford., 60(20), 7051-7063.
https://doi.org/10.1016/j.actamat.2012.09.012

Radetić T, Ophus C, Olmsted DL, Asta M, Dahmen U. Mechanism and dynamics of shrinking island grains in mazed bicrystal thin films of Au. in Acta Materialia. 2012;60(20):7051-7063.
doi:10.1016/j.actamat.2012.09.012 .

Radetić, Tamara, Ophus, Colin, Olmsted, D. L., Asta, M., Dahmen, U., "Mechanism and dynamics of shrinking island grains in mazed bicrystal thin films of Au" in Acta Materialia, 60, no. 20 (2012):7051-7063,
https://doi.org/10.1016/j.actamat.2012.09.012 . .