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129 results on '"Nasiri, Sohrab"'

5. What is TADF (thermally activated delayed fluorescence) compared to the mechanisms of FL (fluorescence), PH (phosphorescence), and TTA (triplet–triplet annihilation) based on a novel naphthalimide sulfonylphenyl derivative as a host?

Author

Nasiri, Sohrab, Rabiei, Marzieh, Shaki, Hanieh, Hosseinnezhad, Mozhgan, Kalyani, Kommineni, Palevicius, Arvydas, Vilkauskas, Andrius, Janusas, Giedrius, Nutalapati, Venkatramaiah, Kment, Stepan, and Michel Nunzi, Jean

Published
2024
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10. Heart Engineering of Photovoltaic Devices: Preparation of New Ru Dyes Using Thioindigo and Phenothiazine.

Author

Hosseinnezhad, Mozhgan, Nasiri, Sohrab, Nutalapati, Venkatramaiah, Gharanjig, Kamaladin, and Nunzi, Jean Michel

Subjects
*CYANO group, *PHENOTHIAZINE, *CARBOXYLIC acids, *RUTHENIUM, *SEMICONDUCTORS
Abstract

ABSTRACT Phenothiazine and thioindigo were used as substitutes to make new Ru dyes for DSSCs. The thioindigo unit is a notable molecule with strong technical qualities in these photosensitizers. As a result, research was done on the cyano substituent as an electron‐donating group. Both theoretical and experimental methods were used to assess the complexes' optical response. A better photovoltaic response is achieved by the cyano groups' efficient bonding with the semiconductor layer. Additionally, the complexes that were formed contain two different kinds of electron accepter substituents: cyanoacrylic acid and carboxylic acid, with efficiencies of 7.42% and 4.17%, respectively. Additionally, cosensitization was investigated and analyzed utilizing N719 and two generated complexes. DSSCs made with Complex 1 and 2 and N719 have corresponding efficiency percentages of 8.86% and 9.74%. [ABSTRACT FROM AUTHOR]

Published
2024
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18. Solution-Processed OLEDs Based on a Bipolar AIE Terpyridine Derivative as a Host

Author

Palanisamy, Prasanth, primary, Rabiei, Marzieh, additional, Hosseinnezhad, Mozhgan, additional, Palevicius, Arvydas, additional, Janusas, Giedrius, additional, Managutti, Praveen B., additional, Mohamed, Sharmarke, additional, de Sousa, Leonardo Evaristo, additional, de Thieulloy, Laure, additional, de Silva, Piotr, additional, Vilkauskas, Andrius, additional, Nasiri, Sohrab, additional, Nunzi, Jean-Michel, additional, and Nutalapati, Venkatramaiah, additional

Published
2024
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21. Significance of Zn Complex Concentration on Microstructure Evolution and Corrosion Behavior of Al/WS2

Author

Gawas, Pratiksha P., primary, Pandurangan, Praveenkumar, additional, Rabiei, Marzieh, additional, Palevicius, Arvydas, additional, Vilkauskas, Andrius, additional, Janusas, Giedrius, additional, Hosseinnezhad, Mozhgan, additional, Ebrahimi-Kahrizsangi, Reza, additional, Nasiri, Sohrab, additional, Nunzi, Jean Michel, additional, and Nutalapati, Venkatramaiah, additional

Published
2023
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22. What is TADF (thermally activated delayed fluorescence) compared to the mechanisms of FL (fluorescence), PH (phosphorescence), and TTA (triplet–triplet annihilation) based on a novel naphthalimide sulfonylphenyl derivative as a host?

Author

Nasiri, Sohrab, primary, Rabiei, Marzieh, additional, Shaki, Hanieh, additional, Hosseinnezhad, Mozhgan, additional, Kalyani, Kommineni, additional, Palevicius, Arvydas, additional, Vilkauskas, Andrius, additional, Janusas, Giedrius, additional, Nutalapati, Venkatramaiah, additional, Kment, Stepan, additional, and Michel Nunzi, Jean, additional

Published
2023
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26. New Insights into Improving the Photovoltaic Performance of Dye-Sensitized Solar Cells by Removing Platinum from the Counter Electrode Using a Graphene-MoS 2 Composite or Hybrid.

Author

Hosseinnezhad, Mozhgan, Ghahari, Mehdi, Mobarhan, Ghazal, Fathi, Mohsen, Palevicius, Arvydas, Nutalapati, Venkatramaiah, Janusas, Giedrius, and Nasiri, Sohrab

Subjects
DYE-sensitized solar cells, PHOTOVOLTAIC power systems, FIELD emission electron microscopes, PLATINUM, CLEAN energy, DENSITY functional theory
Abstract

Photovoltaic systems, such as dye-sensitized solar cells (DSSCs), are one of the useful tools for generating renewable and green energy. To develop this technology, obstacles such as cost and the use of expensive compounds must be overcome. Here, we employed a new MoS2/graphene hybrid or composite instead of platinum in the DSSCs. Furthermore, the correctness of the preparation of the MoS2/graphene hybrid or composite was evaluated by field emission scanning electron microscope (FESEM), and the results showed that the desired compound was synthesized correctly. Inexpensive organic dyes were used to prepare the DSSCs, and their chemical structure was investigated by density functional theory (DFT) and cyclic voltammetry (CV). Finally, the DSSCs were fabricated using MoS2/graphene composite or hybrid, and to compare the results, the DSSCs were also prepared using platinum. Under the same conditions, the DSSCs with MoS2/graphene composite illustrated better efficiency than MoS2/graphene hybrid or/and graphene. [ABSTRACT FROM AUTHOR]

Published
2023
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32. Formation of Nanostructured Functional Elements in TiO 2 -PVTMS-Ag-La Nanocomposites for Photocatalytic Applications †.

Author

Nasiri, Sohrab and Janusas, Giedrius

Subjects
NANOSTRUCTURED materials, NANOCOMPOSITE materials, PHOTOCATALYSIS, CHEMICAL decomposition, PHOTOCATALYSTS
Abstract

The nanoparticles are composed of tens or hundreds of atoms or molecules with different sizes and morphologies (amorphous, crystalline, spherical, needle-shaped, etc.). Most commercially used nanoparticles are in the form of dry powder or liquid. Of course, nanoparticles combined in an organic or aqueous solution in the form of a suspension or paste are also of interest. Photocatalysts are a group of catalysts that act when exposed to light. Photocatalysts are usually solid semiconductor oxides in which the absorption of photons creates electron-hole pairs that can react with molecules on the surface to produce active radicals. Nowadays, nanocomposites have attracted the attention of many researchers due to their special properties, their many technological applications, their unique absorption, photocatalysis, and antimicrobial properties, and their use in the elimination of bacteria. In this research, TiO2-PVTMS-Ag-La nanocomposites with different stoichiometric proportions were synthesized as a disrupting agent and photocatalyst using the sol-gel method. The samples were calcined at a temperature of 700 °C, and then characterizations consisting of XRD were performed. The degradation and photocatalytic effect of TiO2-PVTMS-Ag-La nanocomposites on methylene blue dye were studied. As a result, the nanocomposites TiO2 (80 wt.%), PVTMS (7 wt.%), Ag (2 wt.%), and La (11 wt.%) showed degradation properties. [ABSTRACT FROM AUTHOR]

Published
2023
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34. Biocompatible Piezoelectric PVDF/HA/AgNO 3 Thin Film Prepared by the Solvent Casting Method.

Author

Markuniene, Ieva, Rabiei, Marzieh, Nasiri, Sohrab, Urbaite, Sigita, Palevicius, Arvydas, and Janusas, Giedrius

Subjects
THIN films, HYDROXYAPATITE, POLYVINYLIDENE fluoride, SURFACE energy, SOLVENTS, ACTIVATION energy, DIMETHYL sulfoxide, ENERGY harvesting
Abstract

In this study, new composites based on polyvinylidene fluoride (PVDF) were ornamented and prepared with hydroxyapatite (HA) and silver nitride (AgNO3). Taking into account the polarity of the solvent dimethyl sulfoxide, this solvent was used to disperse the particles. The aim of using DMSO was to create amorphous phases and the strong dipoles of the C–F bond to reduce the energy barrier and improve the electrical properties. The PVDF played the role of matrix in HA, and AgNO3 was used as reinforcing elements. X-ray diffraction of the samples directly showed the amorphous phase and mixed amorphous and crystalline phases when all three materials were used simultaneously for preparing the composite. The scanning electron microscopy (SEM) images of the samples confirmed the role of PVDF, HA, and AgNO3. Furthermore, the energy dispersive X-ray (EDX) analysis was performed and proved that the HA structure did not change when the ratio of Ca P was equal to the ratio of natural HA. The electrical properties were investigated, and the amount of energy ranged from 56.50 to 125.20 mV. The final results showed that a designed device consisting of an active layer made of 0.1 g HA:0.5 g PVDF showed the highest energy barrier, the highest polarity, and surface energy, thus proving its relevance as potential material for energy harvesting applications. [ABSTRACT FROM AUTHOR]

Published
2023
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35. Nanocomposite Based on HA/PVTMS/Cl 2 FeH 8 O 4 as a Gas and Temperature Sensor.

Author

Nasiri, Sohrab, Rabiei, Marzieh, Markuniene, Ieva, Hosseinnezhad, Mozhgan, Ebrahimi-Kahrizsangi, Reza, Palevicius, Arvydas, Vilkauskas, Andrius, and Janusas, Giedrius

Subjects
*GAS detectors, *TEMPERATURE sensors, *NANOCOMPOSITE materials, *PHOTOLUMINESCENCE measurement, *COMPOSITE structures, *GASES, *HYDROXYAPATITE
Abstract

In this paper, a novel nanocrystalline composite material of hydroxyapatite (HA)/polyvinyltrimethoxysilane (PVTMS)/iron(II)chloride tetrahydrate (Cl2FeH8-O4) with hexagonal structure is proposed for the fabrication of a gas/temperature sensor. Taking into account the sensitivity of HA to high temperatures, to prevent the collapse and breakdown of bonds and the leakage of volatiles without damaging the composite structure, a freeze-drying machine is designed and fabricated. X-ray diffraction, FTIR, SEM, EDAX, TEM, absorption and photoluminescence analyses of composite are studied. XRD is used to confirm the material structure and the crystallite size of the composite is calculated by the Monshi–Scherrer method, and a value of 81.60 ± 0.06 nm is obtained. The influence of the oxygen environment on the absorption and photoluminescence measurements of the composite and the influence of vaporized ethanol, N2 and CO on the SiO2/composite/Ag sensor device are investigated. The sensor with a 30 nm-thick layer of composite shows the highest response to vaporized ethanol, N2 and ambient CO. Overall, the composite and sensor exhibit a good selectivity to oxygen, vaporized ethanol, N2 and CO environments. [ABSTRACT FROM AUTHOR]

Published
2022
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36. X-ray Diffraction Analysis and Williamson-Hall Method in USDM Model for Estimating More Accurate Values of Stress-Strain of Unit Cell and Super Cells (2 × 2 × 2) of Hydroxyapatite, Confirmed by Ultrasonic Pulse-Echo Test

Author

Rabiei, Marzieh, primary, Palevicius, Arvydas, additional, Dashti, Amir, additional, Nasiri, Sohrab, additional, Monshi, Ahmad, additional, Doustmohammadi, Akram, additional, Vilkauskas, Andrius, additional, and Janusas, Giedrius, additional

Published
2021
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38. Preparation and investigation of bioactive organic-inorganic nano-composite derived from PVB-co-VA-co-VAc/HA

Author

Nasiri Sohrab, Rabiei Marzieh, Palevicius Arvydas, and Janusas Giedrius

Subjects
chemistry.chemical_classification, chemistry.chemical_compound, Vinyl alcohol, Materials science, chemistry, Chemical engineering, Vinyl acetate, Zeta potential, Ionic bonding, Chemical stability, Thermal stability, Adhesive, Polymer
Abstract

Novel nano-composite composed of poly vinyl butyral co vinyl alcohol co vinyl acetate (PVB-co-VA-co-VAc) covered with bone skeleton like hydroxyapatite (HA) and coating the graphene (G) was produced through the combined phase separation technique and physical evaporation deposition (PVD) method. The chemical formula of HA is ($Ca_{10} (PO_{4})_{6} (OH)_{2}$) and recently HA was interested for researchers as a bioactive protocol ability by substitution link of co-polymers with collagen in large specific area, high thermal stability and chemical stability, high ionic exchange capacity and ability to regenerate itself. PVB-co-VA-co-VAc has strong adhesive properties with different groups such as hydroxyl group through the hydrogen bonds (non-covalent interactions), metal coordination, host-guest interactions, ionic attractions and hydrophobic reactions. The hydroxyl groups enable the PVB-co-VA-co-VAc outstanding adhesion to many substrates obtaining the metal surfaces such as calcium and phosphorus and increasing moisture resistance. PVB-co-VA-co-VAc has good binding capacity on the calcium surface and it can be providing bioactive properties as well. In this case the surfaces of the specimens of nano-composite with weight percentage value (15 %) of PVB-co-VA-co-VAc was characterized by using TG/DSC, XRD, FTIR, BET, Zeta potential and in-vitro analysis. Furthermore, for the investigation mechanical properties of composite, compressive test at room temperature was utilized and the nano-composite was almost in the almost well range of improvement mechanical test. Bioactivity test (in vitro) was performed in the solution body fluid (SBF) for 14 and 30 days and the bonding between calcium and phosphate ions was created on the surface of samples and as a result the measurements were showed that nano-composite PVB-co-VA-co-VAc/HA is bioactive.

Published
2020
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44. Triphenylethylene-based emitters exhibiting aggregation induced emission enhancement and balanced bipolar charge transport for blue non-doped organic light-emitting diodes

Author

Bernard, Ronit Sebastine, primary, Sych, Galyna, additional, Nasiri, Sohrab, additional, Bezvikonnyi, Oleksandr, additional, Volyniuk, Dmytro, additional, Simokaitiene, Jurate, additional, Bucinskas, Audrius, additional, Gudeika, Dalius, additional, Ariffin, Azhar, additional, and Grazulevicius, Juozas V., additional

Published
2021
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