Profile URL: https://hdl.handle.net/20.500.13091/11725
Job Title:Doç. Dr.
Email Address:ickaya@ktun.edu.tr
Main Affiliation:02.11. Department of Metallurgical and Materials Engineering
Status: Current Staff
ORCID:
0000-0003-0773-0391
0000-0003-0773-0391Scopus ID:
56966296500
56966296500YÖK Akademik: EE0E46F2E6418D6A
Google Scholar:
o_gHT1cAAAAJ
o_gHT1cAAAAJWeb of Science ID:
L-8046-2019
L-8046-2019Name Variants:
Kaya, I. Cihan Kaya, I. C.
26 results
Scholarly Output Search Results
Now showing 1 - 10 of 26
Article Optical Absorption Tuning and Structural Insights in Cs2AgInCl6 Double Perovskites Through Cu and Fe Cations Substitution(Elsevier, 2026-02-01) Senol, Aybuke; Kaya, Gulcihan Guzel; Kaya, Ismail CihanThe excellent optical and electrical properties of the organic-inorganic Pb-based halide perovskite make them promising candidates in the field of optoelectronics. However, issues with stability and toxicity prevent these materials from being commercialized. Recently, halide double perovskites have attracted remarkable attention due to their promising optoelectronic properties, stability and non-toxicity. In this study, double perovskite Cs2AgInCl6 particles were successfully synthesized by precipitation method in HCl. Moreover, the effect of Cu (replacing Ag) and Fe (replacing In) cations doping on the structural, morphological, optical, and electrical properties was investigated. The pure sample exhibited two band gaps, 4.1 eV for the allowed transition and 3.1 eV for the parity-forbidden transition. On the other hand, the doped samples exhibit only one transition, with the band gap of the Cu-doped sample at 2.10 eV, while the Fe-doped sample is at 2.36 eV. Additionally, the Cu-doped sample exhibited lower dark current and improved photoresponse compared to the other samples. Although the Cu incorporation was lower than expected based on the experimental composition, it positively affected the optoelectronic properties of Cs2AgInCl6, making it a promising material for solar cells and photodetectors.Article Citation - WoS: 28Citation - Scopus: 30Visible Light Active Heterostructured Photocatalyst System Based on Cuo Plate-Like Particles and Sno2 Nanofibers(WILEY, 2020-01-20) Dursun, Sami; Kaya, İsmail Cihan; Kocabaş, Mustafa; Akyıldız, Hasan; Kalem, VolkanIn this study, CuO-SnO2 p-n type heterostructures were produced and tested for the degradation of methylene blue and 4-nitrophenol under visible light irradiation. CuO particles were produced in plate-like morphology using hydrothermal synthesis. SnO2 nanofibers were obtained by electrospinning. Structural, morphological, optical and semiconducting property characterization of heterostructured CuO-SnO2 and individual phases were performed. The photocatalytic activity was found to change depending on the amount of CuO particles in heterostructured samples. Among others, the sample with 0.35 wt.% CuO-SnO2 showed the highest photocatalytic efficiency with a degradation rate constant 2 h(-1). Active specie scavenger tests revealed that the decomposition reaction occurs through direct oxidation mechanism by the holes in the valence band of SnO2 in pure samples whereas in CuO-SnO2 samples center dot O2- and center dot OH radicals also form and involve in the reactions. Further, the photocatalytic degradation mechanism was revealed using relative band potentials and p-n junctions of the heterostructured photocatalyst.Master Thesis Stokiyometrik Olmayan Fes₂ Nanopartiküllerin Sentezi ve Antibakteriyel Fototerapi Uygulamalarında Kullanımı(2024) Al-sarorı, Ahmed; Kaya, İsmail CihanBakterilerdeki antibiyotik direnci, küresel ölçekte ciddi bir sorun teşkil etmekte olup, antibiyotik içermeyen antibakteriyel stratejilerin geliştirilmesine yönelik ilginin artmasına neden olmuştur. Son araştırmalar, özellikle fototermal, fotodinamik, gaz tedavisi ve kemoterapi gibi çeşitli yöntemleri birleştiren çok yönlü antibakteriyel terapilerin, artan antibakteriyel etkinlikleri nedeniyle dikkat çektiğini göstermektedir. Metal kalkojenit nanopartiküllerin hem fotodinamik hem de fototermal etki göstermesi ve farklı bakteri türlerine karşı etkili olması bu malzemeleri bu alanda ön plana çıkarmıştır. Bu tez çalışmasında toksik olmayan, çevre duyarlı, hidrofilik ve hem fotodinamik hem de fototermal etki gösterdiği bilinen FeS₂ nanopartiküllerinin sıcak besleme yöntemi ile sentezlenmesi ve antibakteriyel özelliklerinin araştırılması üzerine odaklanılmıştır. Öncelikle, FeS₂ sentez parametreleri optimize edilmiş sonrasında farklı stokiyometrilerde FeS2 nanopartikülleri sentezlenerek üretilen partiküllerin kristal yapı, morfoloji ve optik özellikleri detaylı bir şekilde araştırılmıştır. Stokiyometrik olmayan FeS₂ nanopartikülleri, sentez sırasında öncül maddelerin (Fe kaynağı ve S kaynağı) molar oranları değiştirilerek elde edilmiştir. X-ışını fotoelektron spektroskopisi (XPS) analizi, Fe kaynağı ile S kaynağı oranlarının 1/6, 1/8, 1/10 ve 1/12 olduğu örnekler için Fe/S oranlarının sırasıyla 1.012:2, 0.960:2, 0.905:2 ve 0.900:2 olduğunu ortaya çıkarmıştır. 808 nm yakın kızılötesi (NIR) ışık altında yapılan fototermal testler, Fe/S oranlarının 1.012:2, 0.960:2, 0.905:2 ve 0.900:2 olduğu numunelerde sıcaklığın sırası ile 48, 49, 51, ve 53 ºC'lere çıktığını göstermiştir. Kristal içi kusur oranının artması fototermal etkiyi arttırırken, fotodinamik etkiyi azaltmıştır. Fe/S oranı 0.900:2 olan numune için fototermal dönüşüm verimi saf suda %44,3, fosfat tamponlu tuzlu su (PBS) çözeltisinde ise %52,6 olarak hesaplanmıştır. İn vitro antibakteriyel aktivite testleri, stokiyometrik olmayan FeS2 nanopartiküllerinin, Escherichia coli (%98,00 inaktivasyon, 100 μg mL-1) ve Staphylococcus aureus (%99,89 inaktivasyon, 125 μg mL⁻¹) karşısında ROS üretimi ve hipertermi etkisinin sinerjik etkilerinden dolayı güçlü antibakteriyel aktivite sergilediğini göstermiştir. Bu bulgular, stokiyometrik olmayan FeS₂ nanopartiküllerinin, özellikle NIR ışığı altında bakteriyel enfeksiyonların tedavisinde yüksek potansiyele sahip antibakteriyel malzemeler olarak değerlendirilebileceğini kanıtlamıştır.Article Citation - WoS: 44Citation - Scopus: 45Uv/Visible Light Active Cucro2 Nanoparticle-Sno2 Nanofiber P-N Heterostructured Photocatalysts for Photocatalytic Applications(ROYAL SOC CHEMISTRY, 2018) Dursun, Sami; Kaya, İsmail Cihan; Kalem, Volkan; Akyıldız, HasanCuCrO2 nanoparticle decorated SnO2 nanofiber composites have been prepared as novel p-n heterostructured semiconductor photocatalysts for the degradation of organic pollutants in wastewater. The composite structure was achieved via drop casting of various amounts of hydrothermally derived CuCrO2 nanoparticles on electrospun SnO2 nanofibers. The microstructural and morphological features of each semiconductor and the formation of p-n heterojunctions between them were characterized. In addition, the photo-response and electrochemical properties of the samples were determined. The photocatalytic activity of the heterostructured photocatalysts was investigated systematically as a function of the amount of CuCrO2 nanoparticles in the samples. Experimental results showed that the optimal decoration amount was 0.6 wt% CuCrO2 on SnO2. This composite photocatalyst displayed a 41% higher rate constant value compared to pure SnO2 nanofibers in the degradation of methylene blue dye molecules and reached 83% degradation under UV/visible light irradiation after 1 h. The increase in the photocatalytic activity was ascribed to the incorporation of Cr3+ and Cu+ cations into the SnO2 host lattice and the more effective electron-hole pair separation in the heterostructured sample. The presented data here are highly convincing in comparison to those of UV active p-n heterostructured photocatalysts reported previously in the literature. Therefore, this work opens the way to develop visible light active p-n heterostructured semiconductor photocatalysts using p-type delafossites with n-type oxides.Article Citation - WoS: 38Citation - Scopus: 42Photocatalytic Activity and Dielectric Properties of Hydrothermally Derived Tetragonal Batio3 Nanoparticles Using Tio2 Nanofibers(ELSEVIER SCIENCE SA, 2018-10-01) Küçük, Öznur; Teber, Seda; Kaya, İsmail Cihan; Akyıldız, Hasan; Kalem, VolkanTetragonal BaTiO3 nanoparticles have been hydrothermally synthesized using the electrospun TiO2 nanofibers as the Ti-source. Microstructural and compositional analyses have been carried out using XRD, SEM, TEM, XPS, and Raman spectroscopy. Characterization studies confirmed that the BaTiO3 nanoparticles had a tetragonal structure with an average particle size of 100 nm. Photocatalytic activities of the nanoparticles were investigated via the decolorization of methylene blue dye aqueous solutions under visible light and UV-A irradiations. The degradation efficiency reached to 13 and 35% after exposing to light for 60 min with visible and UV-sources, respectively. Effect of sintering temperatures on the dielectric properties was also investigated. Among all the sintering temperatures employed, 1473 K was the optimum sintering temperature for these ceramics in terms of high relative density (95.3%), high dielectric constant (3162 at 1 MHz), and low loss tangent (15 x 10(-3) at 1 MHz). Experimental results showed that electrospun TiO2 fibers can be used as a precursor template to produce nano-scale BaTiO3 particles which are suitable for various applications such as photocatalysis and capacitors. (C) 2018 Elsevier B.V. All rights reserved.Article Biomimetic Hierarchical TiO2@NiCo2O4 Heterostructures for Enhanced Microwave Absorption by the Synergy of Multiple Loss Mechanisms(Springer Heidelberg, 2026-05-11) Kivrak, Burak; Akyol, Mustafa; Ila, Bahar; Kalem, Volkan; Kaya, Ismail Cihan; Akyildiz, Hasan; Balci, IhsanIn this study, TiO2@NiCo2O4 hierarchical heterostructures were fabricated by integrating dual-phase electrospun TiO2 nanofibers with rose-petal-like NiCo2O4 nanostructures through a controlled hydrothermal process. The NiCo2O4 ratio in the heterostructure was tuned from 25 to 100 wt% to investigate its influence on structural, magnetic, and electromagnetic properties. Structural and morphological analyses confirmed the formation of densely packed, petal-like NiCo2O4 architecture uniformly attached to the TiO2 backbone promoting abundant heterogeneous interfaces. Electromagnetic characterization revealed that these interfaces significantly enhanced microwave absorption performance in the 2-18 GHz range. Among all, the TiO2@NiCo2O4 (50 wt%) sample exhibited the most remarkable performance, achieving a minimum reflection loss of -24.10 dB at 12.67 GHz with a broad effective absorption bandwidth of 5.96 GHz at a 3 mm thickness. This superior response is attributed to the synergistic contributions of conduction loss, interfacial and dipolar polarization, multiple reflections enabled by the hierarchical morphology, and magnetic loss mechanisms including natural and exchange resonances. The optimal balance between impedance matching and attenuation capability further enhances overall efficiency. These findings demonstrate that the rational design of hierarchical heterostructures through interface engineering and compositional tuning provides an effective strategy for developing lightweight, high-performance, and broadband microwave absorbing materials suitable for stealth technologies.Article Colloidal Stabilization of FeS2 Nanoparticles with ε-Poly for Enhanced Photothermal and Photodynamic Antibacterial Activity(Elsevier, 2025) Mustafa, Abdurrahman; Alsarori, Ahmed; Akyildiz, Hasan; Kaya, Ismail Cihan; Kaya, Gulcihan Guzel; Guzel Kaya, GulcihanSemiconducting nanomaterials have attracted significant attention as antibiotic free antibacterial platforms. However, they suffer from low colloidal stability and photothermal conversion efficiency. In this study, epsilon-poly-Llysine modified FeS2 nanoparticles were synthesized using hot-injection and wet impregnation methods. Photothermal and photodynamic properties for antibacterial phototherapy were investigated under NIR light. The antibacterial efficiency of the nanoparticles was examined in detail against Escherichia coli and Staphylococcus aureus. The structural, morphological, and thermal properties of the samples were characterized using XRD, FT-IR, TGA, and STEM. Photothermal response, thermal stability, and photodynamic properties of the nanoparticles were revealed using heating experiments under light exposure and fluorescent probe measurements, respectively. Photothermal conversion efficiency of the modified nanoparticles was calculated as 65.5%. The in-vitro antibacterial activity was examined via spread plate method, minimum inhibitory and bactericidal concentrations, antibiofilm assay, and live/dead tests. The experiments showed that 30 wt.% epsilon-poly-L-lysine modified FeS2 nanoparticles practically can eliminate both bacteria (Escherichia coli, 99.6% and Staphylococcus aureus, 100%) at 36 degrees C, at a low material concentration of 125 mu g mL-1, and 10 min of light irradiation. These findings indicate an excellent antibacterial activity for FeS2 nanoparticles after a simple surface modification as compared to unmodified FeS2 and show potential in many other chalcogenide-based antibacterial platforms.Article Citation - WoS: 8Citation - Scopus: 8From Particles To Films: Production of Cs2agbibr6-Based Perovskite Solar Cells and Enhancement of Cell Performance Via Ionic Liquid Utilization at the Tio2/Perovskite Interface(Royal Soc Chemistry, 2024) Ocebe, Arzu; Kaya, İsmail CihanHerein, Cs2AgBiBr6 particles produced by the traditional super-saturation precipitation method were used as precursors to create Cs2AgBiBr6 films by the gas-quenching process under ambient atmospheric conditions. These films were utilized as a light-absorbing layer in hole-transporting free perovskite solar cells (PSCs) with carbon electrodes. Furthermore, the incorporation of the 1-butyl-3-methylimidazole hexafluorophosphate (BMIMPF6) ionic liquid (IL) at the metal oxide electron transporting layer/perovskite interface resulted in enhanced crystallinity of the perovskite, forming large perovskite grains of up to 800 nm. However, it was discovered that establishing the optimal concentration for passivating surface defects takes precedence over encouraging the growth of larger perovskite grains. The utilization of the optimized BMIMPF6 concentration led to a remarkable increase in the power conversion efficiency (PCE) of the cell, with a boost of over 31% to reach 1.67%, when compared to the cell produced without the inclusion of the IL. Our findings underscore that the passivation of surface defects between the TiO2 and perovskite layers holds more importance for enhancing the PCE of Cs2AgBiBr6-based perovskite solar cells than focusing solely on the perovskite morphology.Article Citation - WoS: 83Citation - Scopus: 93Production of Cuo-Wo3 Hybrids and Their Dye Removal Capacity/Performance From Wastewater by Adsorption/Photocatalysis(ELSEVIER, 2020-08-01) Dursun, Sami; Koyuncu, Suna Nur; Kaya, İsmail Cihan; Kaya Güzel, Gülcihan; Kalem, Volkan; Akyıldız, Hasan; Kaya, Gulcihan Guzel[Abstract Not Available]Article Citation - WoS: 33Citation - Scopus: 34Crystal Reorientation and Amorphization Induced by Stressing Efficient and Stable P-I Vacuum-Processed Mapbi(3) Perovskite Solar Cells(Wiley, 2021-01-14) Kaya, İsmail C.; Zanoni, Kassio P. S.; Palazon, Francisco; Sessolo, Michele; Akyıldız, Hasan; Sönmezoğlu, Savaş; Bolink, Henk J.Herein, the long-term stability of vacuum-deposited methylammonium lead iodide (MAPbI(3)) perovskite solar cells (PSCs) with power conversion efficiencies (PCEs) of around 19% is evaluated. A low-temperature atomic layer deposition (ALD) Al2O3 coating is developed and used to protect the MAPbI(3) layers and the solar cells from environmental agents. The ALD encapsulation enables the MAPbI(3) to be exposed to temperatures as high as 150 degrees C for several hours without change in color. It also improves the thermal stability of the solar cells, which maintain 80% of the initial PCEs after aging for approximate to 40 and 37days at 65 and 85 degrees C, respectively. However, room-temperature operation of the solar cells under 1sun illumination leads to a loss of 20% of their initial PCE in 230h. Due to the very thin ALD Al2O3 encapsulation, X-ray diffraction can be performed on the MAPbI(3) films and completed solar cells before and after the different stress conditions. Surprisingly, it is found that the main effect of light soaking and thermal stress is a crystal reorientation with respect to the substrate from (002) to (202) of the perovskite layer, and that this reorientation is accelerated under illumination.
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Research Topics
Domains
Physical Sciences
Fields
EngineeringMaterials ScienceEnergy
Subfields
Electrical and Electronic EngineeringPolymers and PlasticsMaterials ChemistryRenewable Energy, Sustainability and the Environment
Specific Research Areas
Perovskite Materials and Applications
Conducting polymers and applications
Copper-based nanomaterials and applications
ZnO doping and properties
Advanced Photocatalysis Techniques
Sustainable Development Goals
7AFFORDABLE AND CLEAN ENERGY
7
Research Products
6CLEAN WATER AND SANITATION
3
Research Products
15LIFE ON LAND
1
Research Products
12RESPONSIBLE CONSUMPTION AND PRODUCTION
1
Research Products
Documents
25
Citations
593
h-index
13
Documents
25
Citations
559
Publication Collaboration
| Affiliation Name | Count |
|---|---|
| Konya Technical University | 22 |
| Karamanoğlu Mehmetbey University | 6 |
| Selçuk University | 4 |
| Universitat de València | 4 |
| Parc Científic de la Universitat de València | 4 |
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Data obtained from OpenAlex
| Journal | Count |
|---|---|
| INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY | 2 |
| ACS ENERGY LETTERS | 1 |
| Advanced Energy And Sustainability Research | 1 |
| Advanced Therapeutics | 1 |
| Dalton Transactions | 1 |
Current Page: 1 / 5
Scholarly Output
26
Articles
22
Views / Downloads
86/93
Supervised MSc Theses
1
Supervised PhD Theses
1
WoS Citation Count
488
Scopus Citation Count
523
Patents
0
Projects
0
WoS Citations per Publication
18.77
Scopus Citations per Publication
20.12
Open Access Source
7
Supervised Theses
2
Scopus Quartile Distribution
Competency Cloud
