Tomasz Grzyb

Tomasz Grzyb
Adam Mickiewicz University | UAM · Faculty of Chemistry

Dr

About

107
Publications
21,135
Reads
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2,942
Citations
Additional affiliations
February 2009 - June 2010
Adam Mickiewicz Univesity
Position
  • Inorganic nanophosphors containing rare earths ions
Description
  • nanophosphors, nanoluminophores, lanthanide oxyfluorides, upconversion, luminescence
February 2009 - June 2010
Adam Mickiewicz University
Position
  • Synthesis and luminescent properties of nanomaterials activated by lanthanide ions with potencial applications in optoelectronic and biodiagnostic areas
Description
  • nanmomaterials, lanthanides fluorides, luminescence, bioapplications,
Education
October 2007 - June 2011
October 2002 - June 2007

Publications

Publications (107)
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
Novel Ln-MOF with microrods shape were successfully combined with ZnIn2S4 (ZIS) microsphere and used for photocatalytic hydrogen generation under UV–Vis and visible light. The Ln-MOFs/ZIS system comprises lanthanide-carboxylate coordination networks (Tm and Gd as metal ions, and 1,3,5-benzenetricarboxylic acid (BTC) as the organic linker) deposited...
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
The synthesis of upconverting nanoparticles (NPs) is crucial for their spectroscopic properties and further applications. Reducing the size of materials to nano-dimensions usually decreases emission intensity. Therefore, scientists around the world are trying to improve the methods of obtaining NPs to approach levels of emission intensity similar t...
Article
Full-text available
Recently, the up-converting (UC) materials, containing lanthanide (Ln ³⁺ ) ions have attracted considerable attention because of the multitude of their potential applications. The most frequently investigated are UC systems based on the absorption of near-infrared (NIR) radiation by Yb ³⁺ ions at around 975-980 nm and emission of co-dopants, usuall...
Article
Full-text available
Water-dispersible up-converting nanoparticles (UCNPs) are known to be very effective in biomedical applications. Research groups have paid special attention to the synthesis of hydrophilic UCNPs with good physicochemical properties. Being aware of this, we decided to improve the ligand-free modification method of OA-capped NaYF 4 :Yb 3+ ,Er 3+ /NaY...
Article
Full-text available
The upconversion (UC) phenomenon is one of the most frequently investigated in lanthanide ions (Ln³⁺)-doped phosphors. Usually, to obtain UC luminescence, two types of dopants are used: one is a sensitizer, and the other one is an activator, e.g., Yb³⁺/Er³⁺. Exceptional UC luminescence can also be presented by systems doped with one type of Ln³⁺ io...
Article
Full-text available
The right choice of synthesis route for upconverting nanoparticles (UCNPs) is crucial for obtaining a well-defined product with a specific application capability. Thus we decided to compare the physicochemical, cytotoxic, and temperature-sensing properties of UCNPs obtained from different rare earth (RE) ions, which has been made for the first time...
Article
Full-text available
The study provides deep insight into the origin of photocatalytic deactivation of Nb2O5 after modification with ceria. Of particular interest was to fully understand the role of ceria species in diminishing the photocatalytic performance of CeO2/Nb2O5 heterostructures. For this purpose, ceria was loaded on niobia surfaces by wet impregnation. The a...
Article
Full-text available
The aim of this study was to provide deep insight into photocatalytic degradation of ciprofloxacin (CIP) over CeO2/ZnO nanocomposites. Catalysts used in this work were synthesized by a simple co-precipitation method and fully characterized by means of XRD, nitrogen physisorption, TEM, UV-vis, PL and XPS. Degradation of CIP was tracked by UV-vis and...
Article
Full-text available
Nanoparticles (NPs) based on host compound NaYF4 with core@shell structures were synthesised by the precipitation reaction in high-boiling point octadecene/oleic acid solvent. Four laser wavelengths were used (808, 975, 1208, or 1532 nm) for excitation of the obtained NPs. The resulting emission and mechanisms responsible for spectroscopic properti...
Preprint
Full-text available
Water-dispersible up-converting nanoparticles (UCNPs) are known to be very effective in biomedical applications. Research groups have paid special attention to the synthesis of hydrophilic UCNPs with good physicochemical properties. Being aware of this, we decided to improve the ligand-free modification method of OA-capped NaYF 4 :Yb ³⁺ ,Er ³⁺ /NaY...
Article
Full-text available
Control of morphology and spectroscopic properties during the synthesis of up-converting nanoparticles (NPs) is a great challenge. One of the most popular ways of NPs synthesis is the hydrothermal method, which is relatively simple, effective, environmentally friendly and permits easy control of synthesis parameters. For these reasons, the hydrothe...
Article
Enhancing the efficiency of solar light utilization and understanding the acquired mechanism of photocatalytic reactions are the critical goals in the field of heterogeneous photocatalysis. To meet growing demands, the up-conversion particles (UCPs) have become an attractive perspective to extend the absorption spectrum of UV-active photocatalysts....
Article
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
Full-text available
The widespread demand for multifunctional materials that can be used for anticounterfeiting purposes, as dual-mode phosphors or optical nanothermometers, has inspired us to synthesize Yb³⁺/Tm³⁺/Ln³⁺ (Ln = Eu or Tb) doped LaPO4 nanoparticles (NPs) and, based on them, luminescent fibers which utilize and extend the properties of the NPs. They show in...
Article
Full-text available
Spectroscopic properties of YPO4 nanoparticles doped with Yb³⁺, Tm³⁺, and Er³⁺ ions have been studied in detail. These multiemitting materials are promising not only for photonic or electronic use but especially for anticounterfeiting applications. The nanopowders are synthesized by the facile coprecipitation method with annealing in the air atmosp...
Article
Full-text available
The concept of optical temperature sensing, based mainly on the band intensity ratio, line shift or luminescence lifetimes, is utilized for non-invasive and rapid detection of local temperature values in the inspected systems. For these purposes, lanthanide-doped nanoparticles (NPs) seem to be the most promising luminescence nanothermometers, becau...
Article
One of the challenges in the field of heterogeneous photocatalysis is the development of new type of photoactive materials activated by low-power and low-cost irradiation sources, and to understand the mechanism of photocatalytic reaction in the presence of those materials. Photocatalysis based on Er-TiO2 has become an attractive process to remove...
Article
Full-text available
Sensitization of nanoparticles (NPs) by appropriate lanthanide ions is crucial for the obtained spectroscopic properties. Nd³⁺ ions can absorb light at around 808 nm, allowing for deep tissue imaging, Yb³⁺ ions can be effectively excited by 975 nm radiation which is utilized in many areas, e.g. in anti-counterfeit applications, while Er³⁺ ions are...
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
Full-text available
For a number of years nanomaterials have been continuously devised and comprehensively investigated because of the growing demand for them and their multifarious applications, especially in medicine. This paper reports on the properties of SrF2 nanoparticles (NPs) for applications in biomedicine, showing effective ways of their synthesis and lumine...
Article
The utilization of solar light to induce a photocatalytic reaction in the presence of wide band gap semiconductors requires the modification of their surface and optical properties. The Vis-to-UV up-conversion process (UCP) that occurs in lanthanide ions could be employed to induce TiO2. Thus, having in mind solar-forced photocatalysis, nanostructu...
Article
This paper reports the spectroscopic properties of up-converting NaLuF 4 materials doped with Yb ³⁺ , Er ³⁺ and with different amount of Ho ³⁺ ions. The products were synthesized by simple hydrothermal route and their structural properties were carefully examined by using X-ray diffraction and scanning electron microscopy. The relation between the...
Article
Due to their photon up-converting capability, lanthanide ions are ideal candidates dopants for semiconductors for developing visible light-driven photocatalytic activity. Of particular relevance, the low luminescence efficiency of Ln-based nanoparticles is one of the main factors that limits their further applications. Carbon, which is present on t...
Article
In this paper, we demonstrate the enhancement of up-conversion luminescence of LaVO4:Yb³⁺/Ln³⁺ (Ln = Ho, Er and Tm) nanoparticles by co-doping this material with alkaline ions M²⁺ (M = Mg, Sr and Ba) and Sn⁴⁺ ions. The samples were synthesised by a Pechini-type sol-gel method and annealed at 600 °C for 2 h in an air atmosphere. Their structure and...
Article
The article describes the properties of LuF3 and NaLuF4 fluorides doped with Yb³⁺ and Er³⁺ or Tm³⁺ ions, their comparison and application in latent fingermarks imaging. The single-phase materials were successfully synthesized by the hydrothermal method. They exhibited up-conversion (UC) phenomenon under excitation by the near-infrared (NIR) radiati...
Article
Ultrasmall (9-30 nm) Yb3+/Er3+-doped, upconverting alkaline rare-earth fluorides that are promising for future applications were synthesized by the microwave-assisted hydrothermal method. The formation mechanism was proposed, indicating the influence of the stability of metal ions complexes with ethylenediaminetetraacetic acid on the composition of...
Article
Upconversion luminescence of nano-sized Yb3+ and Tm3+ co-doped rare earth phosphates, i.e. LaPO4 and YPO4, has been investigated under high pressure (up to ~25 GPa) and temperature (293-773 K) conditions. The pressure-dependent luminescence properties of the nanocrystals, i.e. energy red-shift of the band centroids, changes of the band ratios, shor...
Article
Full-text available
Nd-modified TiO2 photocatalysts have been obtained via hydrothermal (HT) and sol–hydrothermal (SHT) methods. The as-prepared samples were characterized by X-ray diffraction (XRD), BET surface area measurements, scanning electron microscopy (SEM), diffuse reflectance spectroscopy (DRS), luminescence spectroscopy and X-ray photoelectron spectroscopy...
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
Novel rare earth-doped K2Ta2O6 (RE-K2Ta2O6) photocatalysts were successfully synthesized by one-step hydrothermal method. The effect of dopant type (RE = Y, Yb, Ho, Pr, Er) and amount of rare earth precursor (2, 4, 8 and 10 mol%) on the physicochemical and photocatalytic properties of RE-K2Ta2O6 have been investigated. All as-prepared materials wer...
Article
Full-text available
Anti-Stokes luminescence of up-converting nanocrystals SrF2:Yb³⁺, Er³⁺ can be used as a high pressure optical sensor alternative to the ruby fluorescence-scale. In nanocrystalline SrF2:Yb³⁺, Er³⁺ high pressure reversibly shortens the emission lifetimes nearly linearly up to 5.29 GPa at least. Its advantage is the use of NIR (≈ 980 nm) radiation, hi...
Article
Titanium dioxide (TiO2) nanoparticles (NPs) modified with neodymium (Nd) in the range between 0.1 and 1.0 mol% were prepared via the hydrothermal method. The samples obtained were characterized by diffuse reflectance spectroscopy (DRS), scanning electron microscopy (SEM), X-ray fluorescence (EDX), Brunauer–Emmett–Teller (BET) method, X-ray powder d...
Article
A series of Er-, Yb-, Ho-, Tb-, Gd-, Pr-TiO2 nanotubes (RE-NTs) was prepared via an electrochemical method. The as-prepared photocatalysts were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV–vis absorption, scanning electron microscopy (SEM) and luminescent spectroscopy. The experiments demonstrated that toluen...
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
Multifunctional core/shell type nanomaterials composed of nanocrystalline, lanthanide doped fluorides and gold nanoparticles (Au NPs) were successfully prepared. The products were synthesized to combine luminescence properties of the core NPs, i.e. LnF3/SiO2-NH2 and KLn3F10/SiO2-NH2, and plasmonic activity of the shell Au NPs within a single nanoma...
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
Rare-earth vanadates of the form REVO4 (RE = Y, La, Gd, and Lu) doped by Yb3+/Ho3+, Yb3+/Er3+, or Yb3+/Tm3+ lanthanide ions were successfully synthesized using the sol-gel method and annealing at 600°C in an air atmosphere. The structure and morphology of the prepared nanocrystals were investigated by X-ray diffraction, thermogravimetric analysis,...
Article
Lithium lanthanum praseodymium tetraphosphates nanopowders, LiLa1−xPrx(PO3)4, where x = 0.01–1, were prepared by wet-chemistry synthesis route. The structure and morphology of phosphates were analyzed by collecting X-ray diffraction patterns, Raman and FT-IR spectra. The obtained materials were composed of submicron crystals in the elongated forms...
Article
Full-text available
A paper web produced under industrial conditions always exhibits an anisotropy in its mechanical properties measured in the machine and cross directions. Proper and fast information about current paper anisotropy would significantly increase the efficiency of web quality control systems and allow to produce paper with greater precision. The main ob...
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
Nanomaterials based on BaREF5 fluorides (where RE = Y, Gd and Lu), doped with lanthanide ions Yb3+/Ln3+ (Ln = Er, Ho or Tm) were synthesized by microwave assisted hydrothermal method. The method of synthesis, structural and morphological properties are reported and discussed. The products obtained showed visible upconversion luminescence excited by...
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...