13 results on '"Dawid Piątkowski"'
Search Results
2. Enhancing optical functionality by co-loading NaYF4:Yb,Er and CdSe QDs in a single core-shell nanocapsule
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Marcin Nyk, Dawid Piątkowski, Julita Kulbacka, Maciej Cwierzona, Dominika Wawrzynczyk, Urszula Bazylińska, Sebastian Mackowski, and Magda A. Antoniak
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Fluorescence-lifetime imaging microscopy ,Materials science ,Transmission electron microscopy ,Quantum dot ,Materials Chemistry ,Nanoparticle ,Nanotechnology ,General Chemistry ,Luminescence ,Fluorescence ,Photon upconversion ,Nanocapsules - Abstract
Colloidal, oil-core polymer-shell nanocapsules (NCs), loaded with both upconversion NaYF4:Yb,Er nanoparticles (NPs) and CdSe quantum dots (QDs), were prepared via nanoemulsification/solvent-evaporation methods. Transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD) techniques were used to comprehensively determine the structure, phase composition, and morphology of the NCs. Furthermore, we demonstrated that by simultaneously loading the hybrid fluorophores into the multimodal NCs, it is possible to combine their mechanistically distinct one- and two-photon luminescence properties. The two-photon absorption cross-section obtained at 850 nm for a single capsule was equal to 2.5 × 104 GM (Goeppert-Mayer units). Importantly, cytotoxicity studies indicated the potential of the co-encapsulated NPs and QDs for fluorescence imaging in biological specimens. We conclude that such non-toxic water-dispersible multifunctional nanohybrids represent a promising platform for advanced one- and two-photon induced fluorescence bioimaging and photonic sensing technologies. more...
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- 2020
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3. Photochemical Printing of Plasmonically Active Silver Nanostructures
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Joanna Niedziółka-Jönsson, Kamil Wiwatowski, Karolina Sulowska, Marcin Szalkowski, Martin Jönsson-Niedziółka, Sebastian Mackowski, and Dawid Piątkowski
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Luminescence ,Silver ,Photoluminescence ,Nanostructure ,Materials science ,Physics::Optics ,02 engineering and technology ,Substrate (electronics) ,010402 general chemistry ,Photochemistry ,01 natural sciences ,Article ,silver islands film ,Catalysis ,lcsh:Chemistry ,Inorganic Chemistry ,Metal ,On demand ,Physics::Atomic and Molecular Clusters ,Physical and Theoretical Chemistry ,Absorption (electromagnetic radiation) ,lcsh:QH301-705.5 ,Molecular Biology ,Spectroscopy ,Plasmon ,silver nanostructures ,Lasers ,Organic Chemistry ,technology, industry, and agriculture ,Resonance ,General Medicine ,Surface Plasmon Resonance ,Photochemical Processes ,021001 nanoscience & nanotechnology ,Nanostructures ,0104 chemical sciences ,Computer Science Applications ,lcsh:Biology (General) ,lcsh:QD1-999 ,visual_art ,silver deposition ,visual_art.visual_art_medium ,Printing ,Glass ,0210 nano-technology ,metal enhanced luminescence - Abstract
In this paper, we demonstrate plasmonic substrates prepared on demand, using a straightforward technique, based on laser-induced photochemical reduction of silver compounds on a glass substrate. Importantly, the presented technique does not impose any restrictions regarding the shape and length of the metallic pattern. Plasmonic interactions have been probed using both Stokes and anti-Stokes types of emitters that served as photoluminescence probes. For both cases, we observed a pronounced increase of the photoluminescence intensity for emitters deposited on silver patterns. By studying the absorption and emission dynamics, we identified the mechanisms responsible for emission enhancement and the position of the plasmonic resonance. more...
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- 2020
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4. Upconverting/magnetic: Gd2O3:(Er3+,Yb3+,Zn2+) nanoparticles for biological applications: effect of Zn2+ doping
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Dawid Piątkowski, M. Mouawad, Jarosław Młyńczak, Wojciech Zaleszczyk, Izabela Kamińska, Krzysztof Fronc, Piotr P. Stepien, Sebastian Mackowski, W. Paszkowicz, Tomasz Wojciechowski, Roman Minikayev, Kamil Sobczak, Maciej Szewczyk, A. Siemiarczuk, Miron Kaliszewski, K. Ciszak, Bożena Sikora, Krzysztof Kopczynski, Piotr Dziawa, Mariusz Łapiński, Maksymilian Włodarski, and Danek Elbaum more...
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inorganic chemicals ,Materials science ,Photoluminescence ,General Chemical Engineering ,Doping ,technology, industry, and agriculture ,Analytical chemistry ,chemistry.chemical_element ,Nanoparticle ,General Chemistry ,Zinc ,Photon upconversion ,Ion ,Crystal ,Paramagnetism ,chemistry - Abstract
Upconverting Gd2O3 nanoparticles (NPs) doped 1% Er3+ and 18% Yb3+ permits one to perform optical imaging. Because of the presence of Gd3+ they are useful in MRI. The main challenge is to enhance the NPs upconversion efficiency. As a result of co-doping the NPs with Zn2+ ions, achieved using microwave-induced solution combustion synthesis, we obtained optimal upconversion quantum yields (UQYs). The breakdown of the local crystal field symmetry around the rare earth ions, maximal in the presence of 5% of zinc, may be responsible for the highest observed UQY. The upconversion of IR light results in emission of visible red light mainly at 660 nm and at 550 nm. Optimized red photoluminescence of the samples observed in an organic environment was examined as a function of the laser power density to explain the mechanism of the upconversion emission. Paramagnetic properties of the NPs were determined by superconducting quantum interference device measurements. The non-functionalized nanoparticles incubated with HeLa cells were endocytosed and imaged by confocal laser scanning microscopy. We investigated their localization inside HeLa cells for various incubation times and NPs concentrations. PrestoBlue toxicity assay was performed to test the NPs bio-efficacy. more...
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- 2015
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5. Spectral selectivity of plasmonic interactions between individual up-converting nanocrystals and spherical gold nanoparticles
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Magdalena Twardowska, Javier Aizpurua, Mikolaj K. Schmidt, Sebastian Mackowski, Dawid Piątkowski, Marcin Nyk, Ministerio de Economía y Competitividad (España), and National Science Centre (Poland)
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Materials science ,Analytical chemistry ,Physics::Optics ,02 engineering and technology ,up-conversion ,Purcell effect ,Up-conversion ,010402 general chemistry ,confocal microscopy ,lcsh:Technology ,01 natural sciences ,Molecular physics ,Article ,plasmonics ,Radiative transfer ,Physics::Atomic and Molecular Clusters ,General Materials Science ,Surface plasmon resonance ,lcsh:Microscopy ,Plasmon ,lcsh:QC120-168.85 ,Quenching (fluorescence) ,lcsh:QH201-278.5 ,lcsh:T ,Physics::Classical Physics ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,Confocal microscopy ,Microsecond ,lcsh:TA1-2040 ,Colloidal gold ,Plasmonics ,lcsh:Descriptive and experimental mechanics ,lcsh:Electrical engineering. Electronics. Nuclear engineering ,lcsh:Engineering (General). Civil engineering (General) ,0210 nano-technology ,Luminescence ,lcsh:TK1-9971 - Abstract
This article belongs to the Special Issue Advance in Plasmonics and Metamaterials., We experimentally demonstrate strong spectral selectivity of plasmonic interaction that occurs between α-NaYF :Er/Yb nanocrystals, which feature two emission bands, and spherical gold nanoparticles, with plasmon frequency resonant with one of the emission bands. Spatially–resolved luminescence intensity maps acquired for individual nanocrystals, together with microsecond luminescence lifetime images, show two qualitatively different effects that result from the coupling between plasmon excitations in metallic nanoparticles and emitting states of the nanocrystals. On the one hand, we observe nanocrystals, whose emission intensity is strongly enhanced for both resonant and non-resonant bands with respect to the plasmon resonance. Importantly, this increase is accompanied with shortening of luminescence decays times. In contrast, a significant number of nanocrystals exhibits almost complete quenching of the emission resonant with the plasmon resonance of gold nanoparticles. Theoretical analysis indicates that such an effect can occur for emitters placed at distances of about 5 nm from gold nanoparticles. While under these conditions, both transitions experience significant increases of the radiative emission rates due to the Purcell effect, the non-radiative energy transfer between resonant bands results in strong quenching, which in that situation nullifies the enhancement., This work was financially supported by projects DEC-2013/09/D/ST3/03746 and DEC-2013/10/E/ST3/00034 from the National Science Centre of Poland (NCN) and FIS2016-80174-P from the Spanish Ministry of Competitiveness and Economy. more...
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- 2017
6. Hybrid silica-gold core-shell nanoparticles for fluorescence enhancement
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Sebastian Mackowski, Piotr Nyga, Justyna Grzelak, Jerzy Choma, Aleksandra Krajewska, D. Jamioła, Bartłomiej J. Jankiewicz, Bartosz Krajnik, and Dawid Piątkowski
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Materials science ,Chemical engineering ,Shell (structure) ,Nanoparticle ,Core shell nanoparticles ,Fluorescence ,Gold core ,Plasmon - Abstract
We demonstrate that SiO
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- 2016
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7. Influence of Plasmon Resonance in Silver Island Film on the Optical Properties of Peridinin-Chlorophyll-Protein Light-Harvesting Complexes
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K. Ciszak, Maria Olejnik, Eckhard Hofmann, Bartosz Krajnik, Sebastian Mackowski, Dawid Piątkowski, and J. Strzelecki
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Light-harvesting complex ,chemistry.chemical_compound ,Materials science ,Nuclear magnetic resonance ,Peridinin ,chemistry ,Chlorophyll ,General Physics and Astronomy ,Surface plasmon resonance ,Photochemistry - Published
- 2012
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8. Fluorescence spectroscopy of semiconductor CdTe nanocrystals: preparation effect on photostability
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Dawid Piątkowski, Radek Litvin, Maria Olejnik, Nicholas A. Kotov, Łukasz Bujak, and Sebastian Mackowski
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Materials science ,semiconductor nanocrystal ,business.industry ,Physics ,QC1-999 ,General Physics and Astronomy ,Nanoparticle ,photostability ,Photochemistry ,Fluorescence ,Cadmium telluride photovoltaics ,Fluorescence spectroscopy ,Optics ,Semiconductor ,Resonance fluorescence ,Nanocrystal ,fluorescence ,plasmon interaction ,Laser-induced fluorescence ,business - Abstract
We report on continuous-wave and time-resolved fluorescence spectroscopy studies of CdTe water-soluble nanocrystals at room temperature. For nanocrystals spread directly on the substrate we observe large variation both in fluorescence maximum energy and fluorescence lifetime. We attribute this to the influence of the surface of the nanocrystals on the stability of excitations in the nanocrystals. As the fluorescence lifetime of the nanocrystals is monitored, we find it increases with time from 6 to 18 ns and then saturates. Placing the nanocrystals in a polymer matrix remarkably improves the photostability and all the above-mentioned effects are diminished. Upon mixing the nanocrystals with gold spherical nanoparticles we observe a decrease of the fluorescence intensity due to efficient energy transfer to the nanoparticles. more...
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- 2011
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9. Simulation of the absorption spectrum of Nd3+ activated fluoroaluminate glass
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Dawid Piątkowski
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Absorption spectroscopy ,Probability estimation ,Chemistry ,Branching fraction ,business.industry ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials ,Modeling and simulation ,Optics ,Impurity ,Materials Chemistry ,Ceramics and Composites ,Radiative transfer ,Atomic physics ,Spectroscopy ,business ,Parametrization - Abstract
For decades Judd–Ofelt (JO) theory has been used for describing the intensity of f ↔ f transitions in lanthanides. Theory has proved to be a very useful tool for radiative lifetimes calculation, branching ratios and radiative transitions probability estimation. In this paper, Judd–Ofelt theory is used to simulate the absorption spectrum of Nd3+-doped fluoroaluminate glass. The presented procedure is considered as a tool to determine JO parametrization quality and to estimate linewidths. more...
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- 2007
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10. Plasmonic influence on the up-conversion luminescence in NaYF4:Er3+/Yb3+nanocrystals
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Sebastian Mackowski, Marcin Nyk, Dawid Piątkowski, and K. Ciszak
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Ytterbium ,Microscope ,Materials science ,business.industry ,Nanoparticle ,chemistry.chemical_element ,Photochemistry ,Fluorescence ,Photon upconversion ,law.invention ,Erbium ,Optics ,chemistry ,law ,business ,Luminescence ,Plasmon - Abstract
We study the fluorescence properties of up-converting α-NaYF 4 :Er 3+ /Yb 3+ nanocrystals (NCs) in the presence of spherical Au nanoparticles. The effects of plasmon excitations in the Au nanoparticles were studied using scanning confocal fluorescence microscope. The results show that the 4 S 3/2 → 4 I 15/2 transition in erbium ions, which appears at 540 nm, resonant with the plasmon band of the Au nanoparticles, is efficiently quenched. In contrast, in the case of 4 F 9/2 → 4 I 15/2 transition, which appears at 650 nm, we find the increase of emission intensity. Complementary measurement of fluorescence lifetimes of individual NaYF 4 :Er 3+ /Yb 3+ nanocrystals reveals that plasmonic excitations in Au nanoparticles influence the dynamics of both emission band in erbium ions. more...
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- 2014
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11. Plasmon Enhancement of Fluorescence in Single Light-Harvesting Complexes from em Amphidinium carterae
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Dawid Piątkowski, Christoph Bräuchle, Alexander O. Govorov, Sebastian Mackowski, Roger G. Hiller, Tim Schulte, Łukasz Bujak, Ashish Agarwal, Christophe Jung, Eckhard Hofmann, Hugo Scheer, Tatas H. P. Brotosudarmo, Nicholas A. Kotov, and Stephan Wörmke more...
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Physics ,Oceanography ,ved/biology ,Amphidinium carterae ,ved/biology.organism_classification_rank.species ,General Physics and Astronomy ,Biological sciences - Abstract
Butenandtstrasse 11, D-81377 Munich, Germany Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA Department of Biology and Biotechnology, Ruhr-University Bochum, 44780 Bochum, Germany Department of Biology I–Botany, Ludwig-Maximilian-University, D-80638 Munich, Germany Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701, USA Department of Biological Sciences, Macquarie University, North Ryde, NSW 2109, Australia more...
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- 2009
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12. Fluorescence Microscopy of Corrole-Single Silver Nanowire Hybrid Nanostructures
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Wolfgang Heiss, Dawid Piątkowski, Agnieszka Nowak-Król, Maria Olejnik, Sebastian Mackowski, Nikodem Czechowski, and Daniel T. Gryko
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Nanostructure ,Quenching (fluorescence) ,Materials science ,Nanowire ,General Physics and Astronomy ,Nanotechnology ,Nanomaterials ,law.invention ,chemistry.chemical_compound ,chemistry ,Confocal microscopy ,law ,Fluorescence microscope ,Corrole ,Plasmon - Abstract
We report on confocal microscopy imaging of hybrid nanostructures composed of silver nanowires and corroles. Both nanomaterials were separated by a 30 nm thick SiO2 spacer in order to inhibit uorescence quenching. The results show that for such a hybrid nanostructure the average enhancement of the uorescence intensity reached 2.5. Importantly, the coupling to plasmon excitations in metallic nanowires leaves no e ect on the uorescence spectrum of the organic molecules. more...
13. Silica nanoparticles as a tool for fluorescence collection efficiency enhancement
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Bartosz Krajnik, Dawid Piątkowski, Sebastian Mackowski, Bartłomiej J. Jankiewicz, Magdalena Gajda-Rączka, Eckhard Hofmann, and Piotr Nyga
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Physics::Biological Physics ,Materials science ,Nano Express ,Scattering ,Fluorescence collection efficiency ,Nanochemistry ,Nanoparticle ,Physics::Optics ,Nanotechnology ,Dielectric ,Fluorophores ,Photochemistry ,Condensed Matter Physics ,Silica nanoparticles ,Fluorescence ,Light-harvesting complex ,87.85.jf ,Materials Science(all) ,87.64.K ,Radiative transfer ,General Materials Science ,Emission spectrum ,77.22.-d - Abstract
In this work we demonstrate enhancement of the fluorescence collection efficiency for chlorophyll-containing photosynthetic complexes deposited on SiO2 spherical nanoparticles. Microscopic images of fluorescence emission reveal ring-like emission patterns associated with chlorophyll-containing complexes coupled to electromagnetic modes within the silica nanoparticles. The interaction leaves no effect upon the emission spectra of the complexes, and the transient behavior of the fluorescence also remains unchanged, which indicates no influence of the silica nanoparticles on the radiative properties of the fluorophores. We interpret this enhancement as a result of efficient scattering of electromagnetic field by the dielectric nanoparticles that increases collection efficiency of fluorescence emission. more...
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