TY - JOUR AU - Fouad, S.S. AU - Atyia, H.E. AU - Baradács, Eszter AU - Erdélyi, Zoltán AU - Mehta, N. TI - Synthesis of multiple layers of alternating ZnO and TiO2 using atomic layer deposition and their optical characterization JF - OPTICAL MATERIALS J2 - OPT MATER VL - 151 PY - 2024 PG - 8 SN - 0925-3467 DO - 10.1016/j.optmat.2024.115368 UR - https://m2.mtmt.hu/api/publication/34831253 ID - 34831253 N1 - Physics Department, Ain Shams University, Cairo, 11566, Egypt Physics Department, University of Debrecen, P.O. Box 400, Debrecen, H-4002, Hungary Department of Environmental Physics, University of Debrecen, Hungary Physics Department Banaras Hindu University, Varanasi, 221005, India Export Date: 2 May 2024 CODEN: OMATE Correspondence Address: Mehta, N.; Physics Department Banaras Hindu UniversityIndia; email: dr_neeraj_mehta@yahoo.co.in AB - We report the optical characterization of bi-layer and quadri-layers of TiO2/ZnO transparent oxide films having a net thickness of 100 nm. The atomic layer deposition (ALD) was used to grow these multiple-layered films. We examined their optical properties to understand the impact of the number of layers. The grazing incidence X-ray diffraction (GIXRD) was used to assess the microstructure of the films, which showed that the ZnO layers were polycrystalline, while the TiO2 layers were (X-ray) amorphous. The optical transmission and reflection spectra of the investigated films were recorded in the range of 150–2500 nm at room temperature. The refractive index (n), extinction coefficient (k), real and imaginary parts of the dielectric constant, optical conductivity, and loss factor agree well with those of other amorphous oxides. It was established that the indirect allowed optical transitions are favorable and the optical gap (Eg) increases from 3.03 eV to 3.14 eV as the number of layers increases. The contribution of polarizability (ξ) and electrical susceptibility (χe) to the dielectric constant was also discussed. The relation between the relative density (D) and the porosity (Pro) with the crystalline quality, layer thickness, and the number of layers was also estimated. The results obtained from the study of TiO2/ZnO multilayer films indicate that multilayer thin films improve the quality of film crystallinity and optical properties with the increase of the layers numbers, and could guide the development of potential applications. LA - English DB - MTMT ER - TY - JOUR AU - Fouad, S.S. AU - Baradács, Eszter AU - Nabil, M. AU - Sharma, A. AU - Mehta, N. AU - Erdélyi, Zoltán TI - Linearization and characterization of the Wemple – DiDomenico model of ZnO/Ni/ZnO tri-layer thin films prepared by ALD and DC magnetron sputtering JF - JOURNAL OF ALLOYS AND COMPOUNDS J2 - J ALLOY COMPD VL - 990 PY - 2024 PG - 16 SN - 0925-8388 DO - 10.1016/j.jallcom.2024.174348 UR - https://m2.mtmt.hu/api/publication/34794696 ID - 34794696 N1 - Department of Physics, Faculty of Education, Ain Shams University, Cairo, 11566, Egypt Department of Environmental Physics, Faculty of Science and Technology, University of Debrecen, Poroszlay u.6, Debrecen, 4026, Hungary Departement of Solid-state Physics, Faculty of Science and Technology, University of Debrecen, P.O. Box 400, Debrecen, 4002, Hungary Department of Basic Engineering Sciences, Faculty of Engineering (Shoubra), Benha University, Benha, Egypt Department of Physics, School of Physical Sciences, Mahatma Gandhi Central University, Motihari, 845401, India Export Date: 17 April 2024 CODEN: JALCE Correspondence Address: Nabil, M.; Department of Basic Engineering Sciences, Egypt; email: mohammed_diab35@yahoo.com AB - Our present work is devoted to analyzing the influence of Ni on the optical properties of ZnO thin films deposited on glass and Si (100) substrates, with the use of ALD for ZnO deposition and DC magnetron sputtering for Ni interlayer deposition. The compositions as well as the crystalline structure of various multilayer thicknesses of Ni (10, 30, 50, and 70 nm), that sandwiched between ZnO Films (70 nm), before being optically characterized, were carried out by the X-ray diffraction (XRD). Based on the XRD results, the crystallite size was increased with the increase of the Ni interlayer concentration. Additionally, the material densities for both ZnO and Ni show the expected close-to-bulk values in all formations, where the large cavities between atoms, on the films make the dislocation density become smaller and the surface roughness values decrease as well, with the increase of Ni interlayer concentration. Different optical properties were observed for different Ni content. The optical absorption coefficient (α), refractive index (n), and extinction coefficient (k) have been deduced from the transmission T(λ) and absorption measurements A(λ). The optical energy gap Eopt g are estimated from Tauc΄s extrapolation procedure and the Kubelka-Munk approach. The static refractive index (no), the oscillator energy (Eo), and the dispersion energy (Ed) are calculated using the Wemple-DiDomenico (WDD) theoretical model. Analysis of third-order nonlinear optical properties in crystalline ZnO/Ni/ZnO are being detailed. These promising results imply that the high-quality films produced by ALD, show how the insertion of Ni could enhance the quality of the optical properties of ZnO films. LA - English DB - MTMT ER - TY - JOUR AU - Shenouda, S. S. AU - Mohamed, R. A. AU - Baradács, Eszter AU - Erdélyi, Zoltán TI - Prediction and tuning of the optical energy gap and refractive index of amorphous titania-alumina thin films prepared by atomic layer deposition using adaptive neuro-fuzzy inference system model JF - EUROPEAN PHYSICAL JOURNAL PLUS J2 - EUR PHYS J PLUS VL - 138 PY - 2023 IS - 11 SN - 2190-5444 DO - 10.1140/epjp/s13360-023-04646-2 UR - https://m2.mtmt.hu/api/publication/34407350 ID - 34407350 N1 - Export Date: 30 November 2023 Correspondence Address: Mohamed, R.A.; Physics Department, Egypt; email: Rashaali@edu.asu.edu.eg LA - English DB - MTMT ER - TY - JOUR AU - Fouad, S.S. AU - Nabil, M. AU - Parditka, Bence AU - Ismail, A.M. AU - Baradács, Eszter AU - Atyia, H.E. AU - Erdélyi, Zoltán TI - Assessing, surface morphology, optical, and electrical performance of ZnO thin film using ALD technique JF - JOURNAL OF NANOPARTICLE RESEARCH J2 - J NANOPART RES VL - 25 PY - 2023 IS - 8 PG - 13 SN - 1388-0764 DO - 10.1007/s11051-023-05816-0 UR - https://m2.mtmt.hu/api/publication/34117274 ID - 34117274 N1 - Department of Physics, Faculty of Education, Ain Shams University, Cairo, 11566, Egypt Department of Basic Engineering Sciences, Faculty of Engineering (Shoubra), Benha University, Benha, 13511, Egypt Department of Solid-State Physics, Faculty of Science and Technology, University of Debrecen, P.O. Box 400, Debrecen, 4002, Hungary Department of Environmental Physics, Faculty of Science and Technology, University of Debrecen, Poroszlay u.6, Debrecen, 4026, Hungary Export Date: 29 August 2023 Correspondence Address: Nabil, M.; Department of Basic Engineering Sciences, Egypt; email: mohammed_diab35@yahoo.com LA - English DB - MTMT ER - TY - JOUR AU - Fouad, S. S. AU - Soliman, L. I. AU - Baradács, Eszter AU - Sayed, M. E. AU - Parditka, Bence AU - Osman, N. F. AU - Nabil, M. AU - Erdélyi, Zoltán TI - Advances for enhancing the electrical properties and microhardness activity of ZnO/Cu/ZnO thin films prepared by ALD JF - JOURNAL OF MATERIALS SCIENCE J2 - J MATER SCI VL - 58 PY - 2023 IS - 15 SP - 6632 EP - 6642 PG - 11 SN - 0022-2461 DO - 10.1007/s10853-023-08411-9 UR - https://m2.mtmt.hu/api/publication/33758419 ID - 33758419 N1 - Department of Physics, Faculty of Education, Ain Shams University, Cairo, 11566, Egypt Depaetment of Solid-State Physics, National Research Centre, Physics Research Institute, Cairo, Egypt Departement of Environmental Physics, Faculty of Science and Technology, University of Debrecen, Poroszlay U.6, Debrecen, 4026, Hungary Departement of Solid- State Physics, Faculty of Science and Technology, University of Debrecen, P.O. Box 400, Debrecen, 4002, Hungary Basic Science Department, Modern Academy for Engineering and Technology in Maadi, Cairo, Egypt Department of Basic Engineering Sciences, Faculty of Engineering (Shoubra), Benha University, Benha, Egypt Cited By :1 Export Date: 29 August 2023 CODEN: JMTSA Correspondence Address: Nabil, M.; Department of Basic Engineering Sciences, Egypt; email: mohammed_diab35@yahoo.com AB - Substantial consideration is being devoted to the innovation of AC Conductivity, sheet resistance measurements and Microhardness as a function of Cu interlayer thickness of conductive ZnO/Cu/ZnO thin films. ZnO layer was successfully prepared via atomic layer deposition (ALD), while Cu interlayer was deposited by Dc magnetron sputtering. The combination of ZnO/Cu/ZnO with constant ZnO thickness (70 nm) and variable Cu interlayer thickness (20, 50 and 70 nm), has its own individuality in enhancing the performance of the electrical and mechanical properties. The proposed methodology based on the previously published data of the structural characterization, proved to be very effective. The study of (XRD) and (SEM) revealed an increase in particle size with the increase in Cu content. The outcome of the absorption measurements supports the existence of allowed direct transition for ZnO/Cu/ZnO thin films, and the optical energy gap is strongly dependent on the amount of Cu interlayer thickness. The AC conductivity is explored in the frequency range of (1 MHz–1 GHz) and the temperature range of (293 to 423 K). At different frequencies AC conductivity measurements demonstrate a decrement with the increment of Cu content. An agreement between experimental and theoretical results suggests that the behavior of AC conductivity can be successfully explained by Correlated Barrier Hopping (CBH) model, to elucidate the conduction mechanism existing in our ZnO/Cu/ZnO system. A superior combination between mechanical and electrical properties was evaluated by Vickers hardness and the 4-point technique. The obtained results demonstrate that the layer thickness and the layer thickness ratio of ZnO and Cu are the important parameters which are responsible for the improvement of structural, electrical and mechanical properties of ZnO/Cu/ZnO multilayer films. These findings pave the way for the future development of novel energy devices and photocatalytic and absorption applications. LA - English DB - MTMT ER - TY - JOUR AU - Mehta, N. AU - Fouad, S.S. AU - Baradács, Eszter AU - Parditka, Bence AU - Atyia, H.E. AU - Pal, S.K. AU - Erdélyi, Zoltán TI - Multilayer stack structural designing of titania and zinc white using atomic layer deposition (ALD) technique and study of thermally governed dielectric dispersion and conduction under alternating electric fields JF - JOURNAL OF MATERIALS SCIENCE: MATERIALS IN ELECTRONICS J2 - J MATER SCI: MATER EL VL - 34 PY - 2023 IS - 8 PG - 11 SN - 0957-4522 DO - 10.1007/s10854-023-10068-8 UR - https://m2.mtmt.hu/api/publication/33725781 ID - 33725781 N1 - Physics Department, Banaras Hindu University, Varanasi, India Department of Physics, Ain Shams University, Cairo, Egypt Department of Environmental Physics, University of Debrecen, Debrecen, Hungary Department of Solid State Physics, University of Debrecen, Debrecen, Hungary Export Date: 31 March 2023; Cited By: 0; Correspondence Address: N. Mehta; Physics Department, Banaras Hindu University, Varanasi, India; email: dr_neeraj_mehta@yahoo.co.in AB - The a.c. conduction and the dielectric response were performed on bi-layers and quadri-layers of transparent Titania and Zinc white (i.e., TiO2/ZnO) thin film oxides of 100 nm thickness, deposited using an atomic layer deposition (ALD) system at 200 °C on silicon (100) substrates. The results show that Jonscher’s power law obeys a.c. conductivity (σac) with respect to the frequency dependence. The behavior of (σac) and the change of the frequency exponent (s) with temperature confirm the usage of correlated barrier hopping (CBH) mechanism for conduction. The dielectric response of the dielectric constant (ε′) and the dielectric loss (ε″) with increasing temperature as well as frequency are also analyzed. The consequences of the rise in the number of layers in the designed multilayer stacks are also investigated. Further, the presence of Meyer–Neldel relation in thermally triggered a.c. conduction in both thin-film samples are also reported. The results are explained using the cBΩ model and in terms of applicability for the corresponding relaxation time. © 2023, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature. LA - English DB - MTMT ER - TY - JOUR AU - Shenouda, S.S. AU - Saif, M. AU - Baradács, Eszter AU - Parditka, Bence AU - Fodor, Tamás AU - Erdélyi, Zoltán TI - Optimization of the structural and optical properties of ALD grown ZnO thin films for photocatalytic applications: thickness dependence JF - PHYSICA SCRIPTA J2 - PHYS SCR VL - 98 PY - 2023 IS - 1 SN - 0031-8949 DO - 10.1088/1402-4896/aca93f UR - https://m2.mtmt.hu/api/publication/33539962 ID - 33539962 N1 - Physics Department, Faculty of Education, Ain Shams University, Roxy, Cairo, Egypt Chemistry Department, Faculty of Education, Ain Shams University, Roxy, Cairo, Egypt Department of Solid State Physics, Faculty of Science and Technology, University of Debrecen, PO Box 400, Debrecen, H-4002, Hungary Department of Environmental Physics, Faculty of Science and Technology, University of Debrecen, Hungary Institute for Nuclear Research, Debrecen, Hungary Export Date: 4 January 2023 CODEN: PHSTB Correspondence Address: Shenouda, S.S.; Physics Department, Roxy, Egypt; email: shenouda.fam@edu.asu.edu.eg AB - Thin films of ZnO with different thicknesses (ranging from 8 to 40 nm) have been prepared by plasma-enhanced atomic layer deposition. Grazing incidence x-ray diffraction shows the nano-crystalline structure of the films with high degree of disorder. The films have also lattice oxygen and non-lattice oxygen where the film with 20 nm thickness has the highest percentage of the non-lattice oxygen. These films have indirect optical transitions. The energy gap increases slightly with decreasing the film thickness (2.96, 3.03 and 3.16 eV for the thicknesses 40, 20 and 8 nm, respectively). These films have strong photocatalytic activity to treat the water from the organic dyes such as Levafix Brilliant Red. The film with thickness 20 nm has the optimum photocatalytic activity and the lowest contact angle with water. The photoinduced super-hydrophilic nature of ZnO film (20 nm) renders this film suitable for antifogging application. The high photocatalytic activity and super-hydrophilicity are due to the low recombination rate of charge carriers accompanied to the excess of oxygen vacancies and the high degree of structural disorder. © 2022 IOP Publishing Ltd. LA - English DB - MTMT ER - TY - CONF AU - Kordován, Marcell Árpád AU - Nagy, Tibor AU - Nagy, Lajos AU - Kuki, Ákos AU - Erdélyi, Zoltán AU - Baradács, Eszter AU - Deák, György AU - Zsuga, Miklós AU - Kéki, Sándor ED - Majdik, Cornelia TI - Környezetbarát akkumulátorok fejlesztése 3D nyomtatással támogatva = Development of environmentally friendly secondary battery supported by 3D printing technology T2 - XXVIII. Nemzetközi Vegyészkonferencia = 28th International Conference on Chemistry PB - Erdélyi Magyar Műszaki Tudományos Társaság (EMT) C1 - Kolozsvár T3 - Nemzetközi Vegyészkonferencia, ISSN 1843-6293 PY - 2022 SP - 29 PG - 1 UR - https://m2.mtmt.hu/api/publication/33728889 ID - 33728889 AB - A megfelelő hatékonyságú akkumulátorok fejlesztése elengedhetetlen a megújuló energiaforrások szé-leskörű elterjedésének. A kutatásunkkal célunk volt egy olyan akkumulátor megalkotása, amely széles-körű alkalmazhatósággal rendelkezik. A munka során egy olyan fém-levegő (lítium, cink vagy sárgaréz) cellát hoztunk létre, amelyben a felhasznált komponensek könnyen hozzáférhetőek. A cella kialakításá-nak reprodukálhatósága céljából, a váz elemeket 3D nyomtató segítségével készítettük el polipropilén-ből. A katódként aktív szenet alkalmaztunk egy grafit kollektorral ellátva, nehézfémeket és és egyéb katalizátort ez nem tartalmazott. A cellában lévő diafragma természetes alapú pamutszövet, valamint celofán voltak. A fém-levegő rendszerek elterjedésének hiánya a nagymennyiségű dendritképződésre vezethető vissza, amely csökkentette annak energiahatékonyságát. Különböző elektrolit adalékokat (pl. karboxil telekelikus PEG) teszteltünk, amelyek alkalmazásával sikeresen visszaszorítottuk a dendritkép-ződést. The development of batteries with high efficiency is crucial for storing energy from renewable sources. Our research aimed to create a battery with a wide range of applications. During the work, we created a metal-air (lithium, zinc, brass) cell in which the used chemicals and components are easily accessible. In order to ensure a reproducible backbone, the parts were made using 3D printing. The cathode was charcoal equipped with a graphite collector. The diaphragm in the cell was also a natural-based cotton fabric as well as cellophane. The lack of spread of metal-air systems is due to the formation of a sig-nificant amount of dendrite, which reduces its energy efficiency. Different electrolyte additives were tested and with the application of them the dendrite formation was successfully suppressed. LA - English DB - MTMT ER - TY - JOUR AU - Nagy, Tibor AU - Nagy, Lajos AU - Erdélyi, Zoltán AU - Baradács, Eszter AU - Deák, György AU - Zsuga, Miklós AU - Kéki, Sándor TI - “In Situ” Formation of Zn Anode from Bimetallic Cu-Zn Alloy (Brass) for Dendrite-Free Operation of Zn-Air Rechargeable Battery JF - BATTERIES J2 - BATTERIES VL - 8 PY - 2022 IS - 11 PG - 12 SN - 2313-0105 DO - 10.3390/batteries8110212 UR - https://m2.mtmt.hu/api/publication/33296641 ID - 33296641 AB - In this article, the performance of brass electrode was investigated in a Zn-air (charcoal-based cathode) rechargeable battery. The construction of the battery was carried out with biodegradable materials, namely a cotton cloth diaphragm and carboxymethyl cellulose sodium salt (CMC-Na) viscosity modifier, while the battery skeleton was printed by 3D printing technology. The brass acted as a collector and a preferable surface for the metallic Zn deposition on the brass anode surface. The electrochemical behavior of the brass anode was investigated by cyclic voltammetry (CV). Cyclic performance tests were carried out, which showed stable cell operation even in the presence or absence of additives up to more than 100 cycles. Furthermore, high energy (Eeff) and Coulomb (Ceff) efficiencies, 80% (Eeff), 95% (Ceff), 75% (Eeff), and 95% (Ceff) were obtained, respectively. The Shepherd model was applied to describe the discharging processes of the Zn-air battery containing brass as anode in the presence of additive-free electrolyte or electrolyte with CMC-Na salt additive. It was found that the Shepherd equation described only approximately the resulting discharge curves. In order to attain a more precise mathematical description, stretched exponential function was implemented into the last term of the Shepherd equation. The need for such a correction shows the complexity of the electrochemical processes occurring in these systems. In addition, the surface of the brass anode was also investigated by scanning electron microscopy (SEM) and the composition of the brass alloys was determined by X-ray fluorescence spectroscopy (XRF). Importantly, the formation of dendritic deposition was successfully suppressed and a smooth and uniform surface was obtained after the cycling tests. LA - English DB - MTMT ER - TY - JOUR AU - Fouad, S.S. AU - Baradács, Eszter AU - Nabil, M. AU - Parditka, Bence AU - Negm, S. AU - Erdélyi, Zoltán TI - Microstructural and optical duality of TiO2/Cu/TiO2 trilayer films grown by atomic layer deposition and DC magnetron sputtering JF - INORGANIC CHEMISTRY COMMUNICATIONS J2 - INORG CHEM COMMUN VL - 145 PY - 2022 SN - 1387-7003 DO - 10.1016/j.inoche.2022.110017 UR - https://m2.mtmt.hu/api/publication/33145181 ID - 33145181 LA - English DB - MTMT ER -