Author
Agata Roguska
Other affiliations: Warsaw University of Technology, National Institute for Materials Science
Bio: Agata Roguska is an academic researcher from Polish Academy of Sciences. The author has contributed to research in topics: X-ray photoelectron spectroscopy & Auger electron spectroscopy. The author has an hindex of 19, co-authored 50 publications receiving 1138 citations. Previous affiliations of Agata Roguska include Warsaw University of Technology & National Institute for Materials Science.
Papers
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TL;DR: In this paper, the binding energy of the Pt 4f signal for platinum nanoparticles on an oxide support was significantly lower in comparison to samples where Pt was solely supported onto carbon.
Abstract: Platinum nanoparticles have been selectively deposited on composites of titanium oxide-carbon and tungsten oxide-carbon. Selectivity of the deposition made it possible to investigate changes in electronic properties of both platinum and oxide support, induced by the so-called strong metal–support interactions (SMSI). X-ray photoelectron spectroscopy (XPS) was used, and changes in binding energy of Pt 4f, Ti 2p, and W 4f core-levels and Pt 4f peak asymmetry were determined. These parameters allowed us to state the changes in local electron density, when Pt is deposited on oxide support. In all cases the binding energy of the Pt 4f signal for platinum deposited on an oxide support was significantly lower in comparison to samples where Pt was solely supported onto carbon. The increase in Pt 4f XPS signal asymmetry was observed. This suggests an increased electron density on Pt. No electron donor could be identified from the analysis of the oxide supports. To explain the observed data, at least two effects mu...
303 citations
TL;DR: In this article, the effect of annealing titania nanotubes at 600°C on their morphology and structure was examined using SEM and TEM techniques, which indicated that the nanotubular titania layer became stable after anneal at 600-°C, while its internal structure changed from amorphous to crystalline anatase, and eventually, a mixture of anatase and rutile.
120 citations
TL;DR: In this paper, three factors were found to promote the proliferation of osteoblast (U2OS) cells: a larger nanotube diameter, a higher annealing temperature, and the presence of a thin Ca-P layer.
79 citations
TL;DR: In this paper, the surface-enhanced Raman scattering (SERS) was applied on a TiO2 nanotube/Ti substrate for sputter deposition of Ag, Au or Cu.
74 citations
TL;DR: It has been found that the silver nanoparticles are distributed homogeneously in the coating, which is promising for maintaining a steady antibacterial effect and may offer unique surface features for biomedical implants, ensuring both biocompatibility and antibacterial properties.
Abstract: The new generation of medical implants made by titanium is functionalized with different coatings to improve their bioactivity and reduce a risk of infection. This article describes how these goals can be achieved via deposition of silver nanoparticles and calcium phosphate coating. TiO(2) nanotubes were grown on a Ti substrate via electrochemical oxidation at constant voltage in a mixture of glycerol, deionized water, and NH(4) F. Silver particles with a size of 2-50 nm were deposited on the surface using the sputter deposition technique. Calcium phosphate coatings were grown on the nanotubular titania by simple immersion in Hanks' solution. It has been found that the silver nanoparticles are distributed homogeneously in the coating, which is promising for maintaining a steady antibacterial effect. The results show also that the Ag-incorporated TiO(2) nanotubes significantly stimulate apatite deposition from Hanks' solution. The highly ordered Ag-incorporated TiO(2) nanotube arrays with apatite coating may offer unique surface features for biomedical implants, ensuring both biocompatibility and antibacterial properties.
46 citations
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TL;DR: The antibacterial mechanisms of NPs against bacteria and the factors that are involved are discussed and the limitations of current research are discussed.
Abstract: Nanoparticles (NPs) are increasingly used to target bacteria as an alternative to antibiotics. Nanotechnology may be particularly advantageous in treating bacterial infections. Examples include the utilization of NPs in antibacterial coatings for implantable devices and medicinal materials to prevent infection and promote wound healing, in antibiotic delivery systems to treat disease, in bacterial detection systems to generate microbial diagnostics, and in antibacterial vaccines to control bacterial infections. The antibacterial mechanisms of NPs are poorly understood, but the currently accepted mechanisms include oxidative stress induction, metal ion release, and non-oxidative mechanisms. The multiple simultaneous mechanisms of action against microbes would require multiple simultaneous gene mutations in the same bacterial cell for antibacterial resistance to develop; therefore, it is difficult for bacterial cells to become resistant to NPs. In this review, we discuss the antibacterial mechanisms of NPs against bacteria and the factors that are involved. The limitations of current research are also discussed.
2,178 citations
TL;DR: In this paper, the performance and issues associated with a variety of carbon based materials such as carbon nanotubes (CNT), carbon nanofibers (CNF), mesoporous carbon and graphene as well as non-carbonaceous based materials, e.g. titania, indium oxides, alumina, silica and tungsten oxide and carbide, ceria, zirconia nanostructures and conducting polymers catalyst support materials are clearly described in this review.
1,041 citations
TL;DR: In this article, a focused overview summarizing the most outstanding contributions in the last 10 years in terms of activity and durability of the catalyst materials for ethanol oxidation and oxygen reduction reaction, respectively.
Abstract: Fuel cell technology is currently shifting very fast from fundamental research to real development. In addition to other aspects, this transition is possible because of the important improvements achieved in the field of electrocatalysis in the past decade. This perspective will give a focused overview summarizing the most outstanding contributions in the last 10 years in terms of activity and durability of the catalyst materials for ethanol oxidation and oxygen reduction reaction, respectively. In addition, it provides an outlook about new catalyst support materials with improved performance/stability, advanced characterization techniques, and fundamental studies of reaction mechanisms and degradation processes. All the studies referred to in this perspective significantly contribute to reaching the technical targets for PEFC commercialization.
728 citations
TL;DR: This tutorial review introduces the characteristics of 1D TiO2 nanostructures, the design principles for the fabrication of1DTiO2NSHs, and summary of the recent progress in developing synthesis methods and applications of 1Ds in different fields is summarized.
Abstract: One-dimensional TiO2 nanostructured surface heterostructures (1D TiO2NSHs) have been comprehensively studied during the past two decades because of the possible practical applications in various fields, including photocatalysis, dye-sensitized solar cells, sensors, lithium batteries, biomedicine, catalysis, and supercapacitors. Combining extensive advancements in materials science and nanotechnology, a 1D TiO2NSH material with well-controlled size, morphology, and composition has been designed and synthesized. More importantly, its superior properties, including a high aspect ratio structure, chemical stability, large specific surface area, excellent electronic or ionic charge transfer, and a specific interface effect, have attracted a great deal of interest in improving current performance and exploring new applications. In this tutorial review, we introduce the characteristics of 1D TiO2 nanostructures, the design principles for the fabrication of 1D TiO2NSHs, and we also summarize the recent progress in developing synthesis methods and applications of 1D TiO2NSHs in different fields. The relationship between the secondary phase and the 1D TiO2 nanostructure and between the performance in applications and the excellent physical properties of 1D TiO2NSHs are also discussed.
715 citations
TL;DR: A systematic analysis of results available from in vitro, in vivo and clinical trials on the effects of biocompatible calcium phosphate (CaP) coatings is presented and the future research and use of these devices is discussed.
594 citations