Agata Szczeszak

Agata Szczeszak
Adam Mickiewicz University | UAM · Faculty of Chemistry

PhD

About

45
Publications
5,687
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723
Citations
Citations since 2017
25 Research Items
514 Citations
2017201820192020202120222023020406080
2017201820192020202120222023020406080
2017201820192020202120222023020406080
2017201820192020202120222023020406080

Publications

Publications (45)
Article
Full-text available
Up-converting nanoparticles can be a demand for requirements in many areas, including bioimaging and conversion of energy, but also in the battle against counterfeiting. The properties of lanthanide ions make falsification difficult or even impossible using appropriately designed systems. The proposition of such an approach is the NaErF4:Tm3+@NaYF4...
Article
A group of upconverting Ba2V2O7 barium pyrovanadate materials doped with Yb³⁺, Ho³⁺ was synthesized by hydrothermal method in a basic environment in order to promote the formation of [V2O7]⁴⁻ groups. The structural studies accompanied with the Rietveld analysis confirmed the excellent purity of the undoped matrix, while the increase in the phase co...
Article
The unique properties of upconverting nanoparticles are responsible for their various applications in photonic materials, medicine, analytics, or energy conversion. In this work, the NaErF4:Tm³⁺@NaYF4 [email protected] nanoparticles were synthesized by reaction in high-boiling point solvents and incorporated into cellulose fibers. Nanoparticles sho...
Article
The increasingly wide-spreading falsification of documents, clothing, and packaging has a negative impact on every aspect of the global markets. Therefore, the development of high-quality strategies for materials protection has become a big challenge. Thus, this work presents novel anti-counterfeiting lyocell fibres, exhibiting bright green or yell...
Article
Full-text available
Due to the ongoing need to create phosphors with the appropriate emission color for the production of light emitting diodes, we decided to synthesize a series of multicolour microphosphors with tunable visible emissions, depending on the composition of dopant ions. In this work, we investigated the structure, morphology, and luminescent properties...
Article
Full-text available
The increasing application of lanthanide-doped nanocrystals (LDNCs) entails the risk of a harmful impact on the natural environment. Therefore, in the presented study the influence of gadolinium orthovanadates doped with Eu3+ (GdVO4:Eu3) nanocrystals on wheat (Triticum aestivum L.), chosen as a model plant species, was investigated. The seeds were...
Preprint
Increasing application of lanthanide-doped nanocrystals (LDNCs) entails a risk of a harmful impact on the natural environment. Therefore, in the presented study the influence of gadolinium orthovanadates doped with Eu 3+ nanocrystals on wheat ( Triticum aestivum L.), chosen as a model plant species, was investigated. The seeds were grown in Petri d...
Article
A series of dual-mode nanomaterials based on Ba2LaV3O11:Yb³⁺, Er³⁺, Bi³⁺, with different bismuth content were synthesized using the hydrothermal method. Various analytical methods, such as x-ray diffraction (XRD) with additional detailed Rietveld analysis, transmission electron microscopy (TEM), inductively coupled plasma mass spectroscopy (ICP-MS)...
Article
High-pressure X-ray diffraction studies on nanocrystals of the GdBO3 and YBO3 rare-earth orthoborates are herein reported up to 17.4(2) and 13.4(2) GPa respectively. The subsequent determination of the room-temperature pressure-volume equations of state is presented and discussed in the context of contemporary publications which contradict the find...
Article
In our recent article on the luminescence and compressibility of monoclinic (phase α) and triclinic (β) GdBO3 submicron-sized crystals doped with Eu3+ the bulk modulus value Bo of phase α-GdBO3 should be 96(4) GPa, and for phase β-GdBO3 Bo =17.25(4) GPa.
Preprint
High-pressure X-ray diffraction studies on nanocrystals of the pseudo-vaterite-type borates GdBO$_3$ and YBO$_3$ are herein reported up to 17.4(2) and 13.4(2) GPa respectively. The subsequent determination of the room-temperature pressure-volume equations of state is presented and discussed in the context of contemporary publications which contradi...
Article
Nanophosphors based on NaM(WO4)2 (M = Gd, Y) doped with Yb³⁺/Ho³⁺ were synthesized in situ by a surfactant-assisted hydrothermal route. The average crystallite size of obtained nanophosphors was confirmed by transmission electron microscopy and scanning electron microscopy. Uniform nanocrystals of NaM(WO4)2 (M = Gd, Y) doped with Yb³⁺/Ho³⁺ formed w...
Article
Full-text available
The use of functional nanomaterials and their combination with organic polymers leads to the formation of advanced composites and hybrid inorganic-organic systems having unique properties. The use of such materials as anti-counterfeiting agents (invisible under ambient conditions) is crucial for modern security systems and for further identificatio...
Article
The monoclinic (α) and triclinic (β) GdBO3 submicron-sized crystals doped with Eu³⁺ ions were synthesized using different approaches (sol-gel Pechini and hydrothermal method). The luminescence properties of these two types of GdBO3 are different due to the different symmetry of the local coordination environment of Eu³⁺ ions, embedded in the invest...
Article
According to our knowledge, rare earth based upconverting ternary vanadates are synthesized by the hydrothermal method for the first time. This facile procedure offers an alternative approach to obtaining nanomaterials with the desired crystal structure, while omitting calcination step as to prevent from particle size growth and their agglomeration...
Article
NaYbF4 luminophores doped with Ho³⁺ and increasing amount of Ce³⁺ were synthesized by the solvothermal method in a DAB-2 reactor. The structure and morphology of the obtained materials were determined by X-ray diffraction and a scanning electron microscope. It was confirmed that the phase structure and morphology can be changed by modifying the con...
Article
Full-text available
A series of CaF2-doped phosphors was synthesized in situ in hydrothermal conditions (in a DAB- 2 reactor), in the presence of sodium citrate as a complexing agent preventing premature precipitation. The materials were doped with Yb³⁺/Er³⁺ pair of ions, which resulted in up-conversion emission. Additionally, Mn²⁺ ions were incorporated into the stru...
Article
Microcrystals of the inorganic red emitting phosphors EuxCa1-1.5xMoyW1-yO4 (x = 0.00667, 0.03333, 0.06667; y = 0, 0.1, … 0.9, 1) were synthesized by a traditional solid-state method. Studied materials were characterized by X-ray diffraction, infrared spectroscopy and luminescence spectroscopy (luminescence spectra and lifetime measurements). The mo...
Article
YVO4: Yb³⁺,Er³⁺ upconverting nanocrystals were synthesized via a hydrothermal method using different compounds as surfactants. Structure and morphology of the nanocrystals were investigated by X-ray diffraction and transmission electron microscopy. Tetragonal crystal structure of the nanocrystals appeared irrespective of the type of surfactant used...
Article
Hydrothermal method was applied in order to synthesize nanocrystalline YVO4, LaVO4 and GdVO4 materials doped with Eu³⁺ ions. The conditions of synthesis were chosen to allow control of the process based on precipitation reaction in an autoclave, at elevated temperature and pressure. The prepared materials crystallized as single phase spherical-like...
Article
A series of lanthanide doped yttrium vanadates were prepared by Pechini's method (sol-gel process). The as-prepared precursors, in the presence of citric acid, were calcined in the temperature range of 600–900 °C. The obtained products were composed of small nanoparticles, in the size range of 20–50 nm, depending on the annealing temperature, exhib...
Article
Full-text available
A series of La1-xEuxVO4 samples with a different Eu³⁺ content was synthesized via a hydrothermal route. Increase in the dopant content resulted in decrease in lattice constants of the materials. Plane-wave DFT calculations with PBE functional in CASTEP confirmed this trend. Next, CASTEP calculations were used to obtain force constants of Eu-O bond...
Article
The luminescent GdVO4:Eu(3+)5%@SiO2@NH2 core@shell nanomaterials were obtained via co-precipitation method, followed by hydrolysis and co-condensation of silane derivatives: tetraethyl orthosilicate and 3-aminopropyltriethoxysilane. Their effect on human erythrocytes sedimentation and on proliferation of human lung microvascular endothelial cells w...
Article
High-pressure induced structural transition from zircon-type phase into scheelite-type phase in YVO4 is studied using ab initio calculations. Several structures with compressed volumes are evaluated, where for every considered volume the c/a ratio and atomic positions are optimised. The transition pressure and transition volume change are calculate...
Article
The presented study concerned up-converting core/shell type nanomaterials based on lanthanide(III) ions, Ln(III), doped orthoborates. The system studied composed of the GdBO3 doped with Yb3+/Tb3+ luminescent core ensured an effective cooperative sensitization up-conversion, resulting in a bright green luminescence. The silica coating process was pe...
Article
Full-text available
Multifunctional nanoparticles exhibiting red or green luminescence properties and magnetism were synthesized and thoroughly analyzed. The hydrothermal method was used for the synthesis of Eu3+- or Tb3+-doped GdF3-, NaGdF4-, and BaGdF5-based nanocrystalline materials. The X-ray diffraction patterns of the samples confirmed the desired compositions o...
Article
Rare earths orthovanadates (REVO4) doped with luminescent lanthanide ions (Ln3+) play an important role as promising light-emitting materials. Gadolinium orthovanadate exhibits strong absorption of ultraviolet radiation and as a matrix doped with Eu3+ ions is well known for its efficient and intense red emission, induced by energy transfer from the...
Article
Gadolinium orthoborates doped with Yb 3+ and Tb 3+ ions were synthesised by the sol–gel Pechini method. Materials annealed at 900 °C were composed of the monoclinic GdBO 3 phase with micrometre-sized crystals. The structural properties of the products were analysed by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The compositi...
Article
New interesting aspects of the spectroscopic properties, magnetism, and method of synthesis of gadolinium orthovanadates doped with Eu(3+) ions are discussed. Gd1-xEuxVO4 (x = 0, 0.05, 0.2) bifunctional luminescent materials with complex magnetic properties were synthesized by a microwave-assisted hydrothermal method. Products were formed in situ w...
Article
Triclinic Gd1-xEuxBO3 nanophosphors have been prepared by a hydrothermal method without using additional coreagents and prior precipitation of precursor (in situ). The formation of the borate nanorods and their crystal structure was refined on the basis of X-ray diffraction patterns (XRD) and well confirmed using various techniques such as infrared...
Article
Lanthanum orthoborates doped with Eu3+ or Tb3+ were obtained by a modified Pechini method using ethylene glycol and citric acid as chelating and cross-linking reagents. Crystal structure, morphology and grain size of the obtained nanopowders were determined using XRD (X-ray diffraction), EDX (Energy-dispersive X-ray spectroscopy) and TEM (transmiss...
Article
Nanocrystalline REF3:Tb3+ fluorides (where RE = Y, La, Ce, Gd, and Yb) have been synthesized using a precipitation method in a water/glycerine system. Glycerine, which was added in 25% by volume to Ln(NO3)3 and NH4F reactant solutions, prevented an uncontrolled growth of the nanocrystals and enhanced the stability of the colloids formed in water. X...
Article
Monoclinic Gd(1-x)Eu(x)BO(3) nanopowders were successfully synthesized using a modified Pechini method. The crystal structure of the prepared materials was revised and confirmed using several techniques such as: IR, XRD, TEM, Raman spectroscopy and EDX analysis. The obtained material was comprised of particles, consisting of parts with the average...
Article
Nanophosphors based on cerium?strontium oxide (Sr2CeO4), doped with M2+ or Ln3+ (M = Ca, Mg, Ba, Zn; Ln = Eu, Dy, Tm) were successfully prepared using a modified Pechini method. The structure of prepared materials has been confirmed and characterized using several techniques such as X-ray powder diffraction (XRD), scanning and transmission electron...
Article
Y1-xEuxBO3 nanophosphors were synthesized by a modified co-precipitation method. The structure of the obtained nanocrystals was determined by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The average crystallite size was calculated from the full-width at half-maximum (FWHM) of the diffraction peaks by the Scherrer equation. Th...

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Projects

Projects (3)
Project
The aim of the study is to evaluate the influence of lanthanide-doped nanoparticles on biology, ecology and behaviour of invertebrates. Project's research hypothesis assumes that nanoparticles (NPs) are taken up by animals, accumulated in their body and have impact on them. Therefore, the occurrence of bioaccumulation of the nanocrystals in freshwater and terrestrial biota will be determined. Moreover, the sublethal effects of the studied NPs to freshwater and terrestrial invertebrates will be identified. In addition, influence of the nanoparticles on biology and physiology of plants will be analysed. One of the project goals is verification of the hypothesis that lanthanide-doped nanocrystals are transferred in trophic chains (freshwater and terrestrial).
Project
• to obtain cellulose fibres and paper – ecological materials, which structure will be modified with luminescent modifiers, ML, synthesized, • to prepare yarn or knitted structure based on modified cellulose fibres, • to synthesize printer inks modified with ML and to get luminescence overprints on paper. In the project research tasks were created: • a synthesis of ML – inorganic micro- and nanophosphors with suitably designed spectroscopic properties, based on rare earth elements, which emit visible light with desired colour, under dual-mode excitation of ultraviolet UV or/and infrared radiation IR, • the synthesis of ML with the use of selected method, including: hydro- and solvothermal reactions, precipitation in the high-boiling solvents and co-precipitation in the presence of compounds preventing agglomeration of the crystallites, • optimization of the preparation method of the cellulose fibres modified with ML and fabrication yarn or knitted structure, • development of the manufacturing process and production of the modified paper, • designing and production of the inks containing ML.
Archived project
The aim of the project is the synthesis of nanomaterials based on the rare earth (RE) complex fluorides MIIREF5, MIIRE2F8, MIRE3F10 (where M = cations from I or II group of the periodic table), oxyfluorides REOF, phosphates REPO4 and borates, showing anti-Stokes emission (upconversion) and investigate their structural, morphological and spectroscopic properties.