Kaya, İsmail Cihan
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Kaya, I. Cihan Kaya, I. C. Kaya, İ. C. Kaya, İ. Cihan Kaya, Ismail C. Kaya, İsmail C. Kaya, Ismail Cihan
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ickaya@ktun.edu.tr
Main Affiliation
02.11. Department of Metallurgical and Materials Engineering
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Current Staff
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Research Topics
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Physical Sciences
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EngineeringMaterials ScienceEnergy
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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
1NO POVERTY
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2ZERO HUNGER
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3GOOD HEALTH AND WELL-BEING
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4QUALITY EDUCATION
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5GENDER EQUALITY
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6CLEAN WATER AND SANITATION
3
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7AFFORDABLE AND CLEAN ENERGY
7
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8DECENT WORK AND ECONOMIC GROWTH
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9INDUSTRY, INNOVATION AND INFRASTRUCTURE
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10REDUCED INEQUALITIES
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11SUSTAINABLE CITIES AND COMMUNITIES
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12RESPONSIBLE CONSUMPTION AND PRODUCTION
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13CLIMATE ACTION
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14LIFE BELOW WATER
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15LIFE ON LAND
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16PEACE, JUSTICE AND STRONG INSTITUTIONS
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17PARTNERSHIPS FOR THE GOALS
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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
Scholarly Output
25
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
19.52
Scopus Citations per Publication
20.92
Open Access Source
7
Supervised Theses
2
| 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
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25 results
Scholarly Output Search Results
Now showing 1 - 10 of 25
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 Interface Engineering in Honeybee-Leg TiO2@NiCo2O4 Nanocomposites: A Novel Platform for High-Performance Microwave Absorbers(Elsevier B.V., 2025-11-01) Kıvrak, B.; Kaya, İ.C.; Akyol, M.; Akyıldız, H.This study reports fabrication of novel TiO<inf>2</inf>@NiCo<inf>2</inf>O<inf>4</inf> nanocomposites featuring a honeybee-leg-inspired hierarchical architecture, in which radially aligned NiCo<inf>2</inf>O<inf>4</inf> nanoneedles grow on TiO₂ fibers to mimic the branched morphology of honeybee legs. This unique architecture generates abundant heterointerfaces and multi-level scattering centers, which directly contribute to enhanced interfacial polarization, impedance matching, and microwave attenuation. The nanocomposites were constructed by electrospinning dual-phase TiO<inf>2</inf> nanofibers, followed by the hydrothermal growth of radially aligned NiCo<inf>2</inf>O<inf>4</inf> nanoneedles. Structural and morphological characterization via XRD, SEM, and TEM revealed the formation of a heterostructure with well-defined interfaces. Microwave absorption properties were examined between 2-12 GHz considering reflection loss (RL), impedance matching, complex permittivity and permeability, Cole-Cole plots, Eddy current loss, and attenuation constant. Results demonstrated that the TiO<inf>2</inf>@NiCo<inf>2</inf>O<inf>4</inf> nanocomposite achieved a minimum reflection loss (RL<inf>min</inf>) of -21.30 dB at 9.35 GHz with a 4 mm thickness, and an effective absorption bandwidth (EAB) of 4.27 GHz (7.50-11.77 GHz), covering 94.3 % of the X-band. Additionally, with 5 mm thickness, it reached an RL<inf>min</inf> of -20.51 dB at 7.31 GHz and an EAB of 3.93 GHz (5.38-9.31 GHz), corresponding to 65.5 % C-band and 32.8 % X-band coverage. These superior absorption capabilities are derived from the bio-inspired hierarchical design, which synergistically integrates dielectric and magnetic losses with morphology-assisted multiple-scattering. The findings demonstrate the significance of bio-inspired design and interface engineering in the development of next-generation high-performance microwave absorbing materials. © 2025 Elsevier B.V.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.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: 36Citation - Scopus: 34A Dopant-Free 2,7-Dioctyl[1]benzothieno[3,2 (c8-Btbt) Hole Transporting Layer for Highly Stable Perovskite Solar Cells With Efficiency Over 22%(Royal Soc Chemistry, 2022) Kaya, İsmail Cihan; Özdemir, Resul; Usta, Hakan; Sönmezoğlu, SavaşIn this study, for the first time, n-i-p PSCs were fabricated using dopant-free 2,7-dioctyl[1]benzothieno[3,2-b][1]benzothiophene (C8-BTBT) as the solution-processed hole transporting layer (HTL). The power conversion efficiency (PCE) of the optimized device with the C8-BTBT film that favored edge-on molecular alignment was 22.45% with negligible hysteresis. A thinner dopant-free C8-BTBT HTL effectively protected the perovskite layer from moisture resulting in better shelf-life stability for un-encapsulated PSCs, which maintained >80% of its initial PCE (after a period of 120 days) at a relative humidity level of 40-45%. In addition, the C8-BTBT-based PSCs kept their high performance with no obvious PCE loss at 60 degrees C for 20 days in the ambient atmosphere and retained 82% of their initial PCE at 85 degrees C for 10 days. Overall, our findings revealed that a thin solution-processed C8-BTBT HTL plays a critical role not only in hole extraction and transport but also in greatly improving the ambient and thermal stability of n-i-p PSCs.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.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: 4Citation - Scopus: 4Non-Stoichiometric Fes2 Nanoparticles as Antibacterial Agents With Combined Photothermal and Photodynamic Effect(Elsevier Science Sa, 2025-05-01) Alsarori, Ahmed; Mustafa, Abdurrahman; Akyildiz, Hasan; Kaya, Ismail Cihan; Kaya, Gulcihan GuzelIn this study, non-stoichiometric FeS2 nanoparticles were synthesized via hot-injection method and evaluated as dual effect antibacterial agent. Non-stoichiometric FeS2 nanoparticles were achieved by altering the molar ratio of the precursors (i.e., Fe-source and S-source). X-ray photoelectron spectroscopy (XPS) analysis revealed that Fe/S ratio in the FeS2 nanoparticles were 1.012:2, 0.960:2, 0.905:2, and 0.900:2 for the samples with Fe-source to S-source ratios of 1/6, 1/8, 1/10, and 1/12, respectively. In the case of Fe/S: 0.900:2, the temperature increased up to about 53 degrees C (photothermal conversion efficiency: 52.6 %) in addition to reactive oxygen species (ROS) generation under 808 nm near-infrared (NIR) light irradiation. Based on the in vitro antibacterial activity tests, non-stoichiometric FeS2 nanoparticles exhibited promising antibacterial activity against Escherichia coli (98.00%) and Staphylococcus aureus (99.89%) due to the synergistic effects of ROS formation and hyperthermia. The non-stoichiometric FeS2 nanoparticles can be considered as high potential antibacterial material under NIR irradiation.Doctoral Thesis Çözelti ve Vakum Esaslı Yöntemler ile Perovskit Güneş Hücrelerinin Üretimi ve Karakterizasyonu(Konya Teknik Üniversitesi, 2021) Kaya, İsmail Cihan; Akyıldız, Hasan; Sönmezoğlu, SavaşBu tez çalışmasında, çözelti ve vakum esaslı biriktirme yöntemleri kullanılarak perovskit güneş hücrelerinin üretimi optimize edilmeye çalışılmıştır. Çözelti esaslı hücre üretiminde MAPbI3 ve Cs(0,05)FA(0,85)MA(0,1)PbI(2,7)Br(0,3) olmak üzere iki farklı kompozisyonda perovskit bileşimi kullanılmıştır. FTO/k-TiO2/m-TiO2/perovskit/Spiro-OMeTAD/Au (k-TiO2: kompakt TiO2, m-TiO2: mezoporoz TiO2) konfigürasyonunda üretilen hücrelerde Cs(0,05)FA(0,85)MA(0,1)PbI(2,7)Br(0,3) kompozisyonuna sahip perovskit bileşik ile Voc: 1,105 V, Jsc: 23,38 mA/cm2, FF: 0,66 ve verim değeri %17,0 olan hücreler başarı ile üretilmiştir. Ayrıca, k-TiO2/m-TiO2'ye alternatif olarak SnO2'nin elektron taşıyıcı olarak kullanıldığı düzlemsel hücrelerin üretimi yapılmış ve verim değeri %15,06 olan bu hücrenin Voc, Jsc ve FF değerlerinin sırasıyla 1,091 V, 22,63 mA/cm2 ve 0,54 olduğu tespit edilmiştir. Spiro-OMeTAD'a alternatif olarak önerilen inorganik boşluk taşıyıcı CuSbS2 ile üretilen hücreden elde edilen en yüksek verimin %4,3 olduğu ve düşük verimin CuSbS2'nin kaplanması sürecinde sürekli bir film oluşturacak şekilde paketlenememesinden kaynaklandığı belirlenmiştir. Isıl buhar biriktime yöntemi ile MoO3/TaTm, MoO3/H2, MoO3/PTAA, PTAA ve PolyTPD'nin boşluk taşıyıcı, C60/BCP'nin ise elektron taşıyıcı olarak kullanıldığı MAPbI3 esaslı hücreler üretilmiş ve PTAA tabakaya sahip hücrenin diğerlerine göre termal olarak daha kararlı olduğu gözlemlenmiştir. PTAA kullanılarak Voc, Jsc, FF ve verim değerleri sırasıyla 1,087 V, 22,12 mA/cm2, 0,79 ve %19,2 olan hücreler başarı ile üretilmiştir. Bu hücrelerin oda sıcaklığı ve 65 °C raf ömrü kararlılık deneylerinde 850 h sonunda sırasıyla ilk veriminin %92 ve %82'sini koruduğu tespit edilmiştir. Bunlara ek olarak, oda sıcaklığı ve 85 °C arasında 200 termal çevrime maruz bırakılan hücrenin ilk veriminin %95'ini koruduğu gözlemlenmiştir. Işık altında maksimum güç noktası takip edilerek yapılan çalışma durumu kararlılık testinde ise hücre 230 h içinde başlangıç veriminin %80'ini koruyabilmiştir. Çalışma durumunda meydana gelen verim kaybının perovskitin kristalinitesinde azalmaya bağlı olduğu tespit edilmiştir. Kristalinitede azalma, hem soğurmada düşüşe neden olmuş hem de kristal yapıdaki noktasal hata konsantrasyonunda artışa bağlı olarak Shockley-Read-Hall yeniden birleşme oranını artırmıştır. Böylece, çalışma durumunda verimde azalmanın perovskit tabakadan kaynaklandığı ortaya konulmuştur.
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