TY  - JOUR
AU  - Muñoz-Fernandez, Lidia
AU  - Gómez-Villalba, Luz Stella
AU  - Milošević, Olivera
AU  - Rabanal, Maria Eugenia
PY  - 2022
UR  - https://dais.sanu.ac.rs/123456789/13517
AB  - This study presents the advances in the field of ZnO/Ag catalysts from the synthesis of hierarchical ZnO nanowires (NWs) decorated with Ag nanoparticles, prepared by a facile solvothermal method at 120°C. It evaluates the photocatalytic efficiency from studying the time reaction of Ag/Zn concentration ratio and the presence of cetyltrimethylammonium bromide (CTAB) as an organic dispersant. X-ray diffraction, scanning electron microscopy, and analytical/high-resolution transmission electron microscopy results confirmed the presence of homogeneous cylindrical ZnO nanowires and quasi-spherical Ag crystals. ZnO NWs exhibited hexagonal wurtzite structure and cubic FCC symmetry in Ag nanoparticles (NPS). Two types of nanostructures, including homogeneous cylindrical ZnO NWs in the absence of Ag and simultaneous presence of ZnO NWs and Ag NPs, formed depending on experimental conditions. The photocatalytic activity was evaluated by studying methylene blue (MB) degradation time under UV light excitation. Diffuse reflectance UV–Vis spectrophotometry (UV–Vis DRS) allowed identifying the ZnO absorption band at ~393 nm. Crystal size varied depending on the reaction time and the addition of CTAB. Synthesis time increased bandgap values, getting better photocatalytic performance in samples synthesized in intermediate times (6 h), higher Ag+/Zn2+ molar ratio (0.2/1.0), and CTAB. According to HRTEM observations, the presence of silver nanocrystals with high content of defects (twinning, stacking faults) could play an essential role in the photocatalytic response. In this context, the specific synthesis conditions of Ag/ZnO might be more appropriate for their use in organic dyes degradation in water and the potential use in protective treatments against materials biodeterioration processes. © 2022 The Authors
T2  - Materials Characterization
T1  - Influence of nanoscale defects on the improvement of photocatalytic activity of Ag/ZnO
VL  - 185
DO  - 10.1016/j.matchar.2021.111718
UR  - https://hdl.handle.net/21.15107/rcub_dais_13517
ER  - 

@article{
author = "Muñoz-Fernandez, Lidia and Gómez-Villalba, Luz Stella and Milošević, Olivera and Rabanal, Maria Eugenia",
year = "2022",
abstract = "This study presents the advances in the field of ZnO/Ag catalysts from the synthesis of hierarchical ZnO nanowires (NWs) decorated with Ag nanoparticles, prepared by a facile solvothermal method at 120°C. It evaluates the photocatalytic efficiency from studying the time reaction of Ag/Zn concentration ratio and the presence of cetyltrimethylammonium bromide (CTAB) as an organic dispersant. X-ray diffraction, scanning electron microscopy, and analytical/high-resolution transmission electron microscopy results confirmed the presence of homogeneous cylindrical ZnO nanowires and quasi-spherical Ag crystals. ZnO NWs exhibited hexagonal wurtzite structure and cubic FCC symmetry in Ag nanoparticles (NPS). Two types of nanostructures, including homogeneous cylindrical ZnO NWs in the absence of Ag and simultaneous presence of ZnO NWs and Ag NPs, formed depending on experimental conditions. The photocatalytic activity was evaluated by studying methylene blue (MB) degradation time under UV light excitation. Diffuse reflectance UV–Vis spectrophotometry (UV–Vis DRS) allowed identifying the ZnO absorption band at ~393 nm. Crystal size varied depending on the reaction time and the addition of CTAB. Synthesis time increased bandgap values, getting better photocatalytic performance in samples synthesized in intermediate times (6 h), higher Ag+/Zn2+ molar ratio (0.2/1.0), and CTAB. According to HRTEM observations, the presence of silver nanocrystals with high content of defects (twinning, stacking faults) could play an essential role in the photocatalytic response. In this context, the specific synthesis conditions of Ag/ZnO might be more appropriate for their use in organic dyes degradation in water and the potential use in protective treatments against materials biodeterioration processes. © 2022 The Authors",
journal = "Materials Characterization",
title = "Influence of nanoscale defects on the improvement of photocatalytic activity of Ag/ZnO",
volume = "185",
doi = "10.1016/j.matchar.2021.111718",
url = "https://hdl.handle.net/21.15107/rcub_dais_13517"
}

Muñoz-Fernandez, L., Gómez-Villalba, L. S., Milošević, O.,& Rabanal, M. E.. (2022). Influence of nanoscale defects on the improvement of photocatalytic activity of Ag/ZnO. in Materials Characterization, 185.
https://doi.org/10.1016/j.matchar.2021.111718
https://hdl.handle.net/21.15107/rcub_dais_13517

Muñoz-Fernandez L, Gómez-Villalba LS, Milošević O, Rabanal ME. Influence of nanoscale defects on the improvement of photocatalytic activity of Ag/ZnO. in Materials Characterization. 2022;185.
doi:10.1016/j.matchar.2021.111718
https://hdl.handle.net/21.15107/rcub_dais_13517 .

Muñoz-Fernandez, Lidia, Gómez-Villalba, Luz Stella, Milošević, Olivera, Rabanal, Maria Eugenia, "Influence of nanoscale defects on the improvement of photocatalytic activity of Ag/ZnO" in Materials Characterization, 185 (2022),
https://doi.org/10.1016/j.matchar.2021.111718 .,
https://hdl.handle.net/21.15107/rcub_dais_13517 .

TY  - CONF
AU  - Ferreiro, A.
AU  - Flores-Carrasco, Gregorio
AU  - Urbieta, A.
AU  - Fernández, P.
AU  - Gómez-Villalba, Luz Stella
AU  - Milošević, Olivera
AU  - Rabanal, Maria Eugenia
PY  - 2022
UR  - https://dais.sanu.ac.rs/123456789/13613
AB  - Nanomaterials deserve special attention since they constitute a kind of material that improves structural and functional properties compared to the bulk material. Nanomaterials have emerged as materials with at least one dimension in the range of 1 to 100 nm. They can be classified into different classes based on their properties, shapes (0D, 1D, 2D, or 3D), or sizes. Nanomaterials possess unique physical and chemical properties due to their high surface area and nanoscale size. They can be produced with outstanding magnetic, electrical, optical, mechanical, and catalytic properties that are substantially different from their bulk counterparts. Their optical properties are reported to depend on the size, which imparts different colors due to absorption in the visible region. Their reactivity, toughness, and other properties are also dependent on their unique size, shape, and structure. In summary, their properties can be tuned by controlling the size, shape, synthesis conditions, and appropriate functionalization. This talk will review the past, present, and future of nanomaterials. Based on our research developed in recent years in this area, we will review some of the most important milestones we have reached thanks to the collaboration with international research centers. We will mention the semiconductor systems (ZnO, TiO2,...), nanomaterials with luminescent properties (Gd2O3, Eu2O3,...), multi/single-wall carbon nanotubes, and many other "exotic" materials due to their small size.
PB  - Belgrade : Serbian Ceramic Society
C3  - Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application X New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 26-27. September 2022.
T1  - Nanomaterials: size is the key
SP  - 29
EP  - 29
UR  - https://hdl.handle.net/21.15107/rcub_dais_13613
ER  - 

@conference{
author = "Ferreiro, A. and Flores-Carrasco, Gregorio and Urbieta, A. and Fernández, P. and Gómez-Villalba, Luz Stella and Milošević, Olivera and Rabanal, Maria Eugenia",
year = "2022",
abstract = "Nanomaterials deserve special attention since they constitute a kind of material that improves structural and functional properties compared to the bulk material. Nanomaterials have emerged as materials with at least one dimension in the range of 1 to 100 nm. They can be classified into different classes based on their properties, shapes (0D, 1D, 2D, or 3D), or sizes. Nanomaterials possess unique physical and chemical properties due to their high surface area and nanoscale size. They can be produced with outstanding magnetic, electrical, optical, mechanical, and catalytic properties that are substantially different from their bulk counterparts. Their optical properties are reported to depend on the size, which imparts different colors due to absorption in the visible region. Their reactivity, toughness, and other properties are also dependent on their unique size, shape, and structure. In summary, their properties can be tuned by controlling the size, shape, synthesis conditions, and appropriate functionalization. This talk will review the past, present, and future of nanomaterials. Based on our research developed in recent years in this area, we will review some of the most important milestones we have reached thanks to the collaboration with international research centers. We will mention the semiconductor systems (ZnO, TiO2,...), nanomaterials with luminescent properties (Gd2O3, Eu2O3,...), multi/single-wall carbon nanotubes, and many other "exotic" materials due to their small size.",
publisher = "Belgrade : Serbian Ceramic Society",
journal = "Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application X New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 26-27. September 2022.",
title = "Nanomaterials: size is the key",
pages = "29-29",
url = "https://hdl.handle.net/21.15107/rcub_dais_13613"
}

Ferreiro, A., Flores-Carrasco, G., Urbieta, A., Fernández, P., Gómez-Villalba, L. S., Milošević, O.,& Rabanal, M. E.. (2022). Nanomaterials: size is the key. in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application X New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 26-27. September 2022.
Belgrade : Serbian Ceramic Society., 29-29.
https://hdl.handle.net/21.15107/rcub_dais_13613

Ferreiro A, Flores-Carrasco G, Urbieta A, Fernández P, Gómez-Villalba LS, Milošević O, Rabanal ME. Nanomaterials: size is the key. in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application X New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 26-27. September 2022.. 2022;:29-29.
https://hdl.handle.net/21.15107/rcub_dais_13613 .

Ferreiro, A., Flores-Carrasco, Gregorio, Urbieta, A., Fernández, P., Gómez-Villalba, Luz Stella, Milošević, Olivera, Rabanal, Maria Eugenia, "Nanomaterials: size is the key" in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application X New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 26-27. September 2022. (2022):29-29,
https://hdl.handle.net/21.15107/rcub_dais_13613 .

TY  - JOUR
AU  - Gómez-Villalba, Luz Stella
AU  - Sourty, E.
AU  - Freitag, B.
AU  - Milošević, Olivera
AU  - Rabanal, Maria Eugenia
PY  - 2013
UR  - https://dais.sanu.ac.rs/123456789/15981
AB  - Scanning-Transmission and Transmission Electron Microscopy techniques (STEM and TEM) have been applied to the characterization of nanostructured gadolinium oxides doped with europium synthesized by spray pyrolysis. The High Angle Annular Dark Field (HAADF) – Scanning Transmission Electron Microscopy (STEM) tools have been used to perform a tomographic study to identify morphological characteristics of nanostructured particles, and to differentiate them according to the heat treatments to which these have been subjected. With these techniques it has been possible to confirm the hollowness and porous nature of samples subjected to low temperature annealing (900 °C). Moreover, the beginning of the densification and sintering processes in samples subjected to thermal treatment at higher temperature (1100 °C) have been evaluated. Chemical analysis by electron energy loss spectroscopy (EELS) and X ray energy dispersive spectroscopy (EDS) carried out in STEM mode have allowed to confirm the high uniformity and the expected chemical composition. The high resolution tools either allowed to confirm the presence of a cubic (Ia3 symmetry) and the monoclinic (c2/m symmetry) phases in the nanostructured particles.
PB  - Elsevier
T2  - Advanced Powder Technology
T1  - TEM-STEM study of europium doped gadolinium oxide nanoparticles synthesized by spray pyrolysis
SP  - 864
EP  - 870
VL  - 24
IS  - 5
DO  - 10.1016/j.apt.2013.03.011
UR  - https://hdl.handle.net/21.15107/rcub_dais_15981
ER  - 

@article{
author = "Gómez-Villalba, Luz Stella and Sourty, E. and Freitag, B. and Milošević, Olivera and Rabanal, Maria Eugenia",
year = "2013",
abstract = "Scanning-Transmission and Transmission Electron Microscopy techniques (STEM and TEM) have been applied to the characterization of nanostructured gadolinium oxides doped with europium synthesized by spray pyrolysis. The High Angle Annular Dark Field (HAADF) – Scanning Transmission Electron Microscopy (STEM) tools have been used to perform a tomographic study to identify morphological characteristics of nanostructured particles, and to differentiate them according to the heat treatments to which these have been subjected. With these techniques it has been possible to confirm the hollowness and porous nature of samples subjected to low temperature annealing (900 °C). Moreover, the beginning of the densification and sintering processes in samples subjected to thermal treatment at higher temperature (1100 °C) have been evaluated. Chemical analysis by electron energy loss spectroscopy (EELS) and X ray energy dispersive spectroscopy (EDS) carried out in STEM mode have allowed to confirm the high uniformity and the expected chemical composition. The high resolution tools either allowed to confirm the presence of a cubic (Ia3 symmetry) and the monoclinic (c2/m symmetry) phases in the nanostructured particles.",
publisher = "Elsevier",
journal = "Advanced Powder Technology",
title = "TEM-STEM study of europium doped gadolinium oxide nanoparticles synthesized by spray pyrolysis",
pages = "864-870",
volume = "24",
number = "5",
doi = "10.1016/j.apt.2013.03.011",
url = "https://hdl.handle.net/21.15107/rcub_dais_15981"
}

Gómez-Villalba, L. S., Sourty, E., Freitag, B., Milošević, O.,& Rabanal, M. E.. (2013). TEM-STEM study of europium doped gadolinium oxide nanoparticles synthesized by spray pyrolysis. in Advanced Powder Technology
Elsevier., 24(5), 864-870.
https://doi.org/10.1016/j.apt.2013.03.011
https://hdl.handle.net/21.15107/rcub_dais_15981

Gómez-Villalba LS, Sourty E, Freitag B, Milošević O, Rabanal ME. TEM-STEM study of europium doped gadolinium oxide nanoparticles synthesized by spray pyrolysis. in Advanced Powder Technology. 2013;24(5):864-870.
doi:10.1016/j.apt.2013.03.011
https://hdl.handle.net/21.15107/rcub_dais_15981 .

Gómez-Villalba, Luz Stella, Sourty, E., Freitag, B., Milošević, Olivera, Rabanal, Maria Eugenia, "TEM-STEM study of europium doped gadolinium oxide nanoparticles synthesized by spray pyrolysis" in Advanced Powder Technology, 24, no. 5 (2013):864-870,
https://doi.org/10.1016/j.apt.2013.03.011 .,
https://hdl.handle.net/21.15107/rcub_dais_15981 .