A5068166650- Semiconductor Quantum Structures and Devices
- Quantum Dots Synthesis And Properties
- Magnetic properties of thin films
- ZnO doping and properties
- Quantum and electron transport phenomena
- Magnetic Properties and Applications
- Advanced Semiconductor Detectors and Materials
- Luminescence Properties of Advanced Materials
- Gas Sensing Nanomaterials and Sensors
- Chalcogenide Semiconductor Thin Films
- Metallic Glasses and Amorphous Alloys
- Copper-based nanomaterials and applications
- Analytical Chemistry and Sensors
- nanoparticles nucleation surface interactions
- Electron and X-Ray Spectroscopy Techniques
- Semiconductor materials and devices
- Magneto-Optical Properties and Applications
- Luminescence and Fluorescent Materials
- Physics of Superconductivity and Magnetism
- Radiation Detection and Scintillator Technologies
- Advanced Sensor and Energy Harvesting Materials
- Semiconductor materials and interfaces
- Quantum optics and atomic interactions
- Cold Atom Physics and Bose-Einstein Condensates
- Ion-surface interactions and analysis
Polish Academy of Sciences
2014-2024
Institute of Physics
2013-2024
Czech Academy of Sciences, Institute of Physics
2015-2017
Wojewódzki Inspektorat Ochrony Środowiska w Warszawie
2015-2017
Weizmann Institute of Science
2011
University of Warsaw
2011
Electropolymerizable functional and cross-linking monomers were used to prepare conducting molecularly imprinted polymer film with improved surface area the help of a sacrificial metal-organic framework (MOF). Subsequent dissolution MOF layer resulted in developed MIP film. This enlargement increased analyte accessibility molecular cavities. Application porous as recognition unit an extended-gate field effect transistor (EG-FET) chemosensor effectively enhanced analytical current signals...
Magnetic nanoparticles of Fe3O4 doped by different amounts Y3+ (0, 0.1, 1, and 10%) ions were designed to obtain maximum heating efficiency in magnetic hyperthermia for cancer treatment. Single-phase formation was evident X-ray diffraction measurements. An improved magnetization value obtained the sample with 1% doping. The specific absorption rate (SAR) intrinsic loss power (ILP) values prepared colloids water. best results estimated 0.1% (SAR = 194 W/g ILP 1.85 nHm2/kg a field 16 kA/m...
Chemosensing systems were devised for the enantioselective determination of<sc>d</sc>- and<sc>l</sc>-phenylalanine (<sc>d</sc>- and<sc>l</sc>-Phe).
We study the formation dynamics of a spontaneous ferromagnetic order in single self-assembled CdMnTe quantum dots. By measuring time-resolved photoluminescence, we determine times for QDs with Mn ion contents x varying from 0.01 to 0.2. At low these are orders magnitude longer than exciton spin relaxation evaluated decay photoluminescence circular polarization. This allows us conclude that direction magnetization is determined by momentary fluctuation rather resulting an optical orientation....
This study describes a new method of passivating ZnO nanofiber-based devices with ZnS layer.
Upconverting/paramagnetic Gd<sub>2</sub>O<sub>3</sub>:1% Er<sup>3+</sup>, 18% Yb<sup>3+</sup> with Zn<sup>2+</sup> nanoparticles (NPs) permits one to perform optical imaging.
We present a comprehensive photoluminescence study of exchange interaction in self-assembled CdTe/ZnTe quantum dots. exploit the presence multiple charge states spectra single dots to analyze simultaneously fine structure different excitonic transitions, including recombination neutral exciton/biexciton, doubly charged negative exciton and negatively biexciton. demonstrate that results from electron-hole spin Hamiltonians with effective constants $\delta_i$ can provide good description each...
We demonstrate structural and room temperature magnetic properties of Fe doped ZnO nanofibers (NFs) obtained by electrospinning followed calcination. The observed NFs, formed from crystalographically oriented, approximately 4.5 nm particles conglomerates, were 200 in diameter. reported synthesis ferromagnetic NFs is both facile economical, therefore suggested as a generic method fabricating biocompatible materials. major substrates selected for the (Zn, Fe) comprised relatively low toxicity...
Efficiently upconverting, spherical ZnAl<sub>2</sub>O<sub>4</sub> nanoparticles (NPs), doped with erbium and ytterbium, were synthesized by a combustion aerosol method (CAM) transported to cytosol of carcinoma cell line (HeLa) for the first time.
Multicolor upconversion of SiO<sub>2</sub>-coated nanoparticles using for cells imaging and reactive oxygen species generation.
Cathodoluminescence (CL) was studied in hybrid structures consisting of a diluted magnetic semiconductor (DMS) Cd1−xMnxTe (x=0.06 and 0.09) quantum well buried 300 Å below the surface on which Fe islands with micrometric dimensions were deposited. The CL at T=10 K collected from areas far away island consistent photoluminescence spectra obtained prior to deposition as raster scans spot excited taken nonmagnetized close islands. After magnetization field 3 T, peak related DMS (QW) shifts by...
We fabricated a hybrid structure in which cobalt and permalloy micromagnets produce local in-plane spin-dependent potential barrier for high-mobility electrons at the GaAs/AlGaAs interface. Spin effects are observed ballistic transport range of tens mT external field attributed to switching between Zeeman Stern-Gerlach modes--the former dominating low electron densities.
An effective, simple and practically useful method to incorporate fluorescent nanoparticles inside live biological cells was developed. The internalization time concentration dependence of a frequently used liposomal transfection factor (Lipofectamine 2000) studied. A user friendly, one-step technique obtain water organic solvent soluble Er3+ Yb3+ doped NaYF4 coated with polyvinylpyrrolidone obtained. Structural analysis the confirmed formation nanocrystals desired sizes spectral properties....
Due to its extremely short timescale, the non-equilibrium melting of metals is exceptionally difficult probe experimentally. The knowledge mechanisms thus based mainly on results theoretical predictions. This work reports investigation ultrafast thin polycrystalline Pd films studied by optical laser pump – X-ray free-electron experiments and molecular-dynamics simulations. By acquiring diffraction snapshots with sub-picosecond resolution, we capture sample's atomic structure during...
Optical and electrical measurements of GaAs layers grown by liquid phase epitaxy with different amounts Yb metal (0–1000 ppm) added to the Ga solution are reported. The presence during growth causes strong suppression all donor-related optical transitions due effective removal donors, as judged from Hall effect data. We have not found any appreciable increase background acceptor concentration conductivity conversion n-type p-type, thus conclude that dominant donor gettering occurs already in...
Nanostructures as color-tunable luminescent markers have become major, promising tools for bioimaging and biosensing. In this paper separated molybdate/Gd2O3 doped rare earth ions (erbium, Er3+ ytterbium, Yb3+) core-shell nanoparticles (NPs), were fabricated by a one-step homogeneous precipitation process. Emission properties studied cathodo- photoluminescence. Scanning electron transmission microscopes used to visualize determine the size shape of NPs. Spherical NPs obtained. Their...
In this work we adapt rare-earth-ion-doped NaYF4nanoparticles coated with a silicon oxide shell (NaYF4:20%Yb,0.2%Tm@SiO2) for biological and medical applications (for example, imaging of cancer cells therapy at the nano level). The wide upconversion emission range under 980 nm excitation allows one to use nanoparticles cell (4T1) photodynamic (PDT) without photosensitizer. reactive oxygen species (ROS) are generated by Tm/Yb ion (blue UV light). Thein vitroPDT was tested on 4T1 incubated...
Using resonantly excited photoluminescence (PL) along with excitation (PLE) spectroscopies, we study the carrier processes in $\mathrm{CdTe}∕\mathrm{ZnTe}$ and $\mathrm{CdSe}∕\mathrm{ZnSe}$ self-assembled quantum dots (QD's). PLE spectra of single $\mathrm{CdTe}$ QD's reflect two major mechanisms for excitation: The first, associated presence sharp intense lines spectrum, is a direct excited-state--ground-state transition. second, appearance up to four much broader lines, longitudinal...
We present studies on Coulomb interactions in single self-assembled CdTe quantum dots. use a field effect structure to tune the charge state of dot and investigate impact carrier wave functions. The analysis confined Stark shifts four excitonic complexes allows us conclude that hole function is softer than electron function; i.e., it subject stronger modifications upon changing state. These conclusions are corroborated by time-resolved photoluminescence recombination lifetimes different...
Water-soluble upconversion nanoparticles (UCNPs), based on polyvinylpyrrolidone (PVP)-coated NaYF4:Er3+,Yb3+,Gd3+, with various concentrations of Gd3+ ions and relatively high efficiencies, were synthesized. The internalization cytotoxicity the thus obtained UCNPs evaluated in three cell lines (HeLa, HEK293 astrocytes). No was observed even at up to 50 μg ml-1. fate within cells studied by examining their emission spectra confocal microscopy confirming these observations transmission...