A5101960549- Luminescence Properties of Advanced Materials
- Analytical chemistry methods development
- Electrochemical Analysis and Applications
- Radiation Detection and Scintillator Technologies
- Nuclear materials and radiation effects
- Atomic and Subatomic Physics Research
- Inorganic Fluorides and Related Compounds
- Analytical Chemistry and Chromatography
- RNA Interference and Gene Delivery
- Lanthanide and Transition Metal Complexes
- Catalysts for Methane Reforming
- Perovskite Materials and Applications
- Medical Imaging Techniques and Applications
- Thermochemical Biomass Conversion Processes
- Advanced Thermodynamics and Statistical Mechanics
- Dendrimers and Hyperbranched Polymers
- Bioeconomy and Sustainability Development
- Immunotherapy and Immune Responses
- Insect Utilization and Effects
- Analytical Chemistry and Sensors
- Graphene and Nanomaterials Applications
- Spectroscopy and Chemometric Analyses
- Viral Infectious Diseases and Gene Expression in Insects
- Inorganic Chemistry and Materials
- Advanced Photocatalysis Techniques
Tampere University
2024-2025
Laboratoire de Spectroscopie pour les Interactions, la Réactivité et l'Environnement
2022-2024
Université de Lille
2022-2024
Centre National de la Recherche Scientifique
2022-2024
Sharif University of Technology
2016-2019
Ferdowsi University of Mashhad
2013-2016
Lanthanide (Ln3+)-doped upconversion nanoparticles (UCNPs) often suffer from weak luminescence, especially when their sizes are ultrasmall (less than 10 nm). Enhancing the luminescence (UCL) efficiency of UCNPs has remained a challenge that must be undertaken if any practical applications to envisaged. Herein, we present Ln3+-doped oxysulfide@fluoride core/shell heterostructure which shows efficient UCL properties under 980 nm excitation and good stability in solution. Through epitaxial...
Abstract Reducing the size of upconversion nanoparticles (UCNPs) down to a few nm yields luminescent materials containing very small number emitters. Considering bottom limit one activator per particle ultrasmall UCNPs offer an unprecedented platform study contributions different energy transfers at play in luminescence. Maintaining detectable emission despite limited emitting ions and high surface‐to‐volume ratio requires suitable architectures. Na(Gd‐Yb)F 4 :Tm 3+ emissive sub‐3 diameter...
We have utilized an upconverting nanoparticle (UCNP) with thulium (Tm) ions as emitters and Ytterbium (Yb) sensitizers (TmUCNP) for nanometric photoexcitation of a film conjugated polymer, poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV). The TmUCNPs surrounded by thin layer MEH-PPV were photoexcited at 976 nm using continuous-wave (CW) near-infrared laser. NIR light was selectively absorbed the sensitizer TmUCNPs, leading to formation submillisecond-lifetime excited...
We have utilized an upconverting nanoparticle (UCNP) with thulium (Tm) ions as emitters and Ytterbium (Yb) sensitizers (TmUCNP) for nanometric photoexcitation of a film conjugated polymer, poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV). The TmUCNPs surrounded by thin layer MEH-PPV were photoexcited at 976 nm using continuous-wave (CW) near-infrared laser. NIR light was selectively absorbed the sensitizer TmUCNPs, leading to formation submillisecond-lifetime excited...
In our study, we prepared Fe3O4 nanoparticles (NPs) using food waste extract of Mealworm (Tenebrio molitor) larvae fed spinach (Spinacia oleracea), which is rich in iron. A coating was applied to NPs containing hyperbranched spermine-polyethylene glycol-folic acid (FHSPF) and (FSMPF). Polymer loaded with siRNA or DNA. DLS1, H-NMR, FTIR, EDX, Zeta potential TEM were used analyze morphology NPs. Biocompatibility, DNA release, gene transfer properties evaluated. Coats concentration increased...
Abstract Photocrosslinking of hydrogels with non‐pulsed red light offers improved biocompatibility and deep tissue penetration in contrast to traditional UV‐initiated methods. However, fabricated upon red‐light excitation are always colored by a photoinitiator, limiting their use applications requiring high optical transparency, such as (bio)sensors, ophthalmological applications, or wound dressings. Additionally, the cytotoxicity photoinitiator is concern, especially bioapplications....
AbstractA simple and efficient method for iron speciation (Fe2+, Fe3+) using dispersive liquid–liquid microextraction based on solidification of organic drop (DLLME-SFO) technique followed by flame atomic absorption spectrometry was developed. In this method, 1 mL ethanol (as the disperser solvent) containing 50 µL 1-undecanol extracting injected rapidly into sample solution (II), (III) species 1.1 × 10−3 mol L−1 oxine complexing agent). The procedure is complexation Fe3+ with...
A new size dependence kinetic equation for chain growth factor in Fischer-Tropsch synthesis (FTS) was developed using a thermodynamic analysis method. For evaluation of structural sensitivity FTS reaction, series iron oxide nanoparticles were prepared as catalyst via precipitation by microemulsion The experimental results indicated that the difference between activation energies propagation and termination reactions (Et-Ep) decreased with decreasing particle size. Calculated dependent model...
Reducing the size of upconversion nanoparticles (UCNPs) down to a few nm yields unique luminescent materials containing very small number emitters. Considering bottom limit one activator per particle, such ultrasmall UCNPs offer an unprecedented platform study contributions different energy transfer processes at play in luminescence, especially role cross relaxation. Maintaining detectable emission despite limited emitting ions and high surface-to-volume ratio requires suitable particle...
Upconversion luminescence of lanthanide-based upconversion nanoparticles (UCNPs) is a nonlinear step-wise process in which the consecutive absorption multiple, low-energy photons results subsequent emission high-energy photon. The primary mechanism energy transfer (ETU) from sensitizer (Yb3+) to an activator (Tm3+). It requires several excitation by Yb3+, followed sequential Tm3+ions. Excited states relax their ground either radiatively emitting photon or non-radiatively multiphonon...
Reducing the size of upconversion nanoparticles (UCNPs) down to a few nm yields unique luminescent materials containing very small number emitters. Considering bottom limit one activator per particle, such ultrasmall UCNPs offer an unprecedented platform study contributions different energy transfer processes at play in luminescence, especially role cross relaxation. Maintaining detectable emission despite limited emitting ions and high surface-to-volume ratio requires suitable particle...
In this study, hyperbranched spermine (HS), spermine-polyethylene glycol-folic acid (HSPF) and glycol-glucose (HSPG) were synthesized for DNA protection gene delivery. The HS/DNA, HSPF/DNA, HSPG/DNA acid/glucose/DNA (HSPFG/DNA) nanoparticles prepared by combining different concentrations of HS, HSPF, HSPG with the same amount DNA. characterized physicochemical characteristics, against plasma degradation, in vitro vivo cytotoxicity transfection assays. results showed that have high ability to...
Reducing the size of rare earth, alkali metal fluoride crystals formulated as upconverting nanoparticles (UCNP) down to few nm can lead unique luminescent devices due a reduced number emitters. The synthesis such Na(Gd-Yb)F4:Tm nanocrystals is still challenging. most critical issue keep detectable emission despite high surface volume ratio and limited emitting ions. preparation sub-3 diameter emissive, ꞵ-phase UCNPs with emitters was achieved using gadolinium-rich composition, an in-situ...