Büyükçakır, Onur
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Büyükcakir, Onur
Buyukcakir, Onur
Onur Büyükçakır
Buyukcakir, O
Buyukcakir, O.
Büyükçakır, O.
Büyükçakır, O
Buyukcakir, Onur
Onur Büyükçakır
Buyukcakir, O
Buyukcakir, O.
Büyükçakır, O.
Büyükçakır, O
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Email Address
onurbuyukcakir@iyte.edu.tr
Main Affiliation
04.01. Department of Chemistry
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Current Staff
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1NO POVERTY
0
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2ZERO HUNGER
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3GOOD HEALTH AND WELL-BEING
1
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4QUALITY EDUCATION
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5GENDER EQUALITY
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6CLEAN WATER AND SANITATION
0
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7AFFORDABLE AND CLEAN ENERGY
4
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8DECENT WORK AND ECONOMIC GROWTH
1
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9INDUSTRY, INNOVATION AND INFRASTRUCTURE
4
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10REDUCED INEQUALITIES
0
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11SUSTAINABLE CITIES AND COMMUNITIES
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12RESPONSIBLE CONSUMPTION AND PRODUCTION
2
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13CLIMATE ACTION
2
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14LIFE BELOW WATER
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15LIFE ON LAND
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Documents
54
Citations
4349
h-index
32
Documents
53
Citations
4261
Scholarly Output
19
Articles
10
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26977/2562
Supervised MSc Theses
7
Supervised PhD Theses
1
WoS Citation Count
179
Scopus Citation Count
168
Patents
0
Projects
0
WoS Citations per Publication
9.42
Scopus Citations per Publication
8.84
Open Access Source
11
Supervised Theses
8
| Journal | Count |
|---|---|
| ACS Applied Energy Materials | 2 |
| Polymer Chemistry | 2 |
| Helvetica Chimica Acta | 1 |
| New Journal of Chemistry | 1 |
| Turkish Journal of Chemistry | 1 |
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19 results
Scholarly Output Search Results
Now showing 1 - 10 of 19
Master Thesis Synthesis of Indandione-Based Porous Organic Polymers and Their Applications in Zinc-Ion Batteries(01. Izmir Institute of Technology, 2022) Şimşek, Gizem; Büyükçakır, OnurThere has been growing interest in porous organic polymers (POPs) in recent years due to their large surface area, easy chemical tunability, sustainability, and high thermal and chemical stability. Due to their exceptional properties, they are suitable for use as platforms in various applications, including gas storage, separation, catalysis, and, more recently, energy storage systems. In this regard, it is imperative to design new functional POPs with a large surface area, permanent porosity, and physicochemical stability. In this thesis, we have presented indandione-based POPs (r-POPs) prepared by an acid-catalyzed condensation reaction between s-indacene-1,3,5,7(2H,6H)-tetraone and benzene-1,3,5-tricarboxaldehyde under highly environmentally friendly conditions. In order to optimize the reaction conditions, we first synthesized the model compound, namely 2-benzylidene-1H-indene-1,3(2H)-dione. The model compound was characterized by using 1H and 13C-NMR spectroscopy. Using different types of acids, we have investigated the effect of acid on polymerization and its textural properties. The polymers were characterized using various characterization techniques. Due to increased interest in renewable energy as a fossil fuel substitute, energy storage systems have attracted colossal interest, and rechargeable aqueous zinc-ion batteries (ZIBs) are seen as promising energy storage systems, particularly for grid-scale applications. In this respect, the carbonyl-rich structure of r-POPs transforms them into a potential electrode material. Thus, we have also investigated their electrochemical performances as cathode materials for ZIBs. Although r-POPs showed low electrochemical performance in capacity and cycle life, they have great potential to be an electrode material in other metal-ion batteries.Doctoral Thesis Design, Synthesis, and Characterization of Porous Dendritic Polymers for Gas Sensor Applications(01. Izmir Institute of Technology, 2024) Büyükçakır, Onur; Zeybek, Hüseyin; Büyükçakır, OnurPolifenilen dendrimerler (PPD'ler), yüksek oranda dallanmış 3D küresel yapıları ile ayırt edilen makromoleküllerdir. PPD'ler genellikle merkezi çok fonksiyonlu bir çekirdek molekül etrafında fenil halkaları ve uç gruplara sahip dallarla inşa edilir. PPD'ler fizikokimyasal olarak kararlı ve sağlam yapılar sunan rijit, şekil değiştirmeyen fenil halkalarından oluşur. Bu karakteristik özellikleri PPD'leri ışık hasadı, organik elektronik, katalizörler gibi birçok uygulamada kullanılmak üzere umut verici bileşikler haline getirse de, katı haldeki gözeneksiz yapıları nedeniyle gaz ve enerji depolamada kullanımları sınırlıdır. Bu tez, fonksiyonel PPD'leri gözenekli dendritik polimerlere (PDendP'ler) dahil etmek için yeni bir modüler yaklaşım benimsemeyi amaçlamaktadır; bu yaklaşım, 'kalıcı-şekilli dendrimerleri' organik bağlayıcılarla polimerize ederek gerçekleştirilmektedir. Şekli bakımından kalıcı PPD'lerin monomer olarak kullanılması, PDendP'lerde yüzey alanlarının ve gözenekliliklerinin öngörülebilirliğini ve kontrol edilebilirliğini artıran yerel bir düzen sunar. Bu bağlamda, bu yaklaşım PDendP'lerde yapı ve işlevsellik üzerinde hassas moleküler kontrol sağlar. Bu tez, üç farklı PDendP hazırlamak için ditopik bir bağlayıcı kullanarak üç nesil PPD'nin polimerleştirilmesini önermiştir. Bu nedenle, yüzeyde bromo atomlarına sahip üç nesil PPD sentezlenmiş ve bu PPD'ler Suzuki eşleşme reaksiyonları yoluyla bağlayıcı olarak 1,4-bis(4,4,5,5-tetrametil-1,3,2-dioksaborolan-2-il)benzen kullanılarak polimerleştirilmiştir. PDendP'ler ve PPD'ler NMR, FT-IR, BET, TGA, XRD, SEM ve EDX dahil olmak üzere çeşitli analitik teknikler kullanılarak karakterize edilmiştir. Sentezlenen tüm polimerler, PDendP'lerin kemorezistör sensör uygulamaları için bir algılama malzemesi olarak potansiyelini araştırmak amacıyla etanol buharına maruz bırakılmıştır. Islak laboratuvar ortamındaki sonuçları güçlendirmek için hesaplamalı simülasyonlardan yararlanılmıştır.Article Citation - WoS: 41Citation - Scopus: 44Ultralong-Life Quinone-Based Porous Organic Polymer Cathode for High-Performance Aqueous Zinc-Ion Batteries(American Chemical Society, 2023) Büyükçakır, Onur; Yüksel, Recep; Begar, Ferit; Erdoğmuş, Mustafa; Arsakay, Madi; Lee, Sun Hwa; Kim, Sang OukWe synthesized and studied a redox-active quinone-basedporousorganic polymer (rPOP) and found ultralong cycle life: it is a promisingorganic cathode for aqueous zinc-ion batteries (ZIBs). It has highphysicochemical stability and enhanced intrinsic conductivity fromits fused-aromatic conjugated skeleton. rPOP's high porosityallows for efficient Zn2+ infiltration through the poresduring charging-discharging cycles and contributes to the efficientutilization of redox-active quinone units. It delivers a specificcapacity of 120 mAh g(-1) at a current density of0.1 A g(-1) with a flat and long discharge plateau,which is critically important to provide a stable voltage output.It provides ultralong cycle life at a current density of 1.0 A g(-1) for 1000 and at 2.0 A g(-1) for 30 000cycles, with initial capacity retention of 95 and 66%, respectively.The co-insertion (Zn2+ and H+) charge storagemechanism was investigated using various electrochemical measurementsand ex/in situ structural characterization techniques, and is explainedherein. These findings contribute to a better understanding of thestructure-property relationship for rPOP and open a new avenuefor new organic cathode materials for high-performance next-generationaqueous batteries.Master Thesis Investigation of Electronic, Vibrational, Mechanic and Chemicalproperties of 2d-Dlhc Cui Crystal(01. Izmir Institute of Technology, 2023) Demirok, Ali Cem; Büyükçakır, Onur; Şahin, HasanThe branch of material science and nanotechnology has recently seen the emergence of a remarkable class of materials known as 2D materials. These materials have unusual features and behaviours because of their special two-dimensional structure that separates them apart from bulk materials. One of the characteristics of 2D materials are related to their capacity to handle large mechanical deformation without fracture. Since the discovery of graphene, researchers have discovered and created an extensive range of additional 2D materials with a variety of chemical compositions and topologies. These materials can be used for energy storage, sensing, catalysis and biomedical applications. In this thesis, electronic, vibrational, mechanic and chemical properties of singlelayer CuI were investigated by using density functional theory (DFT) based first-principles calculations. It is shown that the CuI structure crystallizes in a hexagonal lattice by energy and geometry optimizations. The vibrational properties of the material were examined by phonon and Raman calculations and the structure found to be dynamically stable and there were four Raman active modes. The electronic band dispersions and corresponding density of states showed that the single-layer CuI crystal has semiconductor nature with direct band gap. Strain calculations were performed to examine the mechanical strength of the CuI crystal. Effect of biaxial strain on the electronic band structure of CuI crystal was investigated in the range of 5% and the direct band gap behaviour did not change. Biaxial and uniaxial strain calculations have shown that it is resistant to high stresses.Article Benzoxazine-Linked Porous Organic Networks for Effective Iodine Capture(Royal Soc Chemistry, 2025) Canturk, Batu Sercan; Erdogmus, Mustafa; Gecalp, Yasmin; Sahin, Hasan; Buyukcakir, OnurThis study presents, for the first time, the investigation of a benzoxazine-linked porous organic network (BPON) for iodine capture. BPON was synthesized through the Mannich condensation of paraformaldehyde, melamine, and phloroglucinol. The porous structure and heteroatom-rich skeleton of BPON make it a promising adsorbent platform for iodine capture. BPON demonstrated an effective iodine capture capability in the vapour phase (3.32 g g-1) and an impressive uptake capacity in the aqueous phase (2.80 g g-1 capacity, 90.4% removal efficiency in 12 hours). To investigate the effect of curing on iodine capture, BPON was thermally cured to prepare thermally cured benzoxazine-linked porous organic networks (cBPONs) at three different temperatures: 200, 250, and 300 degrees C. cBPONs demonstrated an iodine capture capacity of up to 2.20 g g-1 and 1.67 g g-1 for vapour and aqueous phases, respectively. The iodine capture mechanism of BPON was investigated using various ex situ analyses, including Fourier transform infrared (FT-IR), Raman spectra, and X-ray photoelectron spectra (XPS). Structural analysis and theoretical calculations indicated the formation of a charge-transfer complex upon iodine capture, leading to the generation of polyiodide species. This study demonstrates the potential of BPONs for iodine capture and paves the way for developing new polymeric adsorbents for capturing iodine from air and water.Article Citation - WoS: 3Citation - Scopus: 3Β-Ketoenamine-linked covalent organic framework for efficient iodine capture(Tubitak Scientific & Technological Research Council Turkey, 2024) Büyükçakır, OnurExploring the materials that effectively capture radioactive iodine is crucial in managing nuclear waste produced from nuclear power plants. In this study, a β-ketoenamine-linked covalent organic framework (bCOF) is reported as an effective adsorbent to capture iodine from both vapor and solution. The bCOF’s high porosity and heteroatom-rich skeleton offer notable iodine vapor uptake capacity of up to 2.51g $g^{–1}$ at 75 °C under ambient pressure. Furthermore, after five consecutive adsorption-desorption cycles, the bCOF demonstrates high reusability performance with significant iodine vapor capacity retention. The adsorption mechanism was also investigated using various ex situ structural characterization techniques, and these mechanistic studies revealed the existence of a strong chemical interaction between the bCOF and iodine. The bCOF also showed good iodine uptake performance of up to 512 mg $g^{–1}$ in cyclohexane with high removal efficiencies. The bCOF’s performance in adsorbing iodine from both vapor and solution makes it a promising material to be used as an effective adsorbent in capturing radioactive iodine emissions from nuclear power plants.Article Citation - WoS: 3Citation - Scopus: 3Continuous Production of Hyperbranched Polyhydrocarbons by Electrochemical Polymerization of Chlorinated Methanes(Royal Society of Chemistry, 2022) Seo, Jae Hong; Nam, Hyun Ju; Rajendiran, Rajmohan; Seong, Won Kyung; Jiang, Yi; Kim, Min Hyeok; Büyükçakır, OnurA continuous production of polyhydrocarbon (PHC) by electrochemical polymerization of chlorinated hydrocarbons is presented. Monomer loading and product transfer were controlled by changing flow direction in a home-built continuous flow system that facilitates preparation, work-up, and scale-up of electrochemical polymerization. The polymerization can be tuned by adjusting reaction time, cell configuration, molar ratio of input chemicals, and the solvent type. CH2Cl2, CHCl3, and CCl4 were used to synthesize PHC. The reduction of the monomers at the cathode was studied by cyclic voltammetry and chronoamperometry. We investigated the structure and composition of PHCs from FT-IR and NMR spectra along with elemental analysis. Sufficient amounts of product are generated by continuous production and characterization of the product PHCs by a wide variety of methods is possible. Particularly, structural analysis by various C-13 NMR techniques suggests a new pathway for the synthesis of hyperbranched PHCs by electrochemical polymerization.Master Thesis Synthesis and Investigation of Quinone-Pyrrole Polymeric Materials for Zinc-Ion Batteries(01. Izmir Institute of Technology, 2024) Çanakçı, Utku Cem; Büyükçakır, OnurFosil yakıtların günümüzde yaygın kullanımı çevre üzerinde yıkıcı bir etkiye sahiptir. Bu durum, çevre dostu alternatif enerji kaynaklarının benimsenmesini zorunlu kılmıştır. Çinko-iyon piller, bu bağlamda önemli potansiyele sahip, gelişmekte olan yeni bir enerji depolama sistemi sınıfını temsil etmektedir. Bununla birlikte, bu teknolojiyi ilerletmekteki büyük zorluk, Zn2+ iyonlarını verimli ve geri dönüşümlü olarak barındırabilen katot malzemeleri geliştirmektir. Kinon bazlı konjuge polimerik malzemeler, redoks aktif yapıları, kolayca değiştirilebilen yapıları ve güçlü kimyasal ve termal kararlılıkları nedeniyle çinko-iyon pilleri için mükemmel katot seçenekleridir. Bu çalışmada, çinko-iyon pilleri (ÇİP'ler) için katot malzemeleri olarak kinon-pirol konjuge polimerik malzemeler (QRP'ler) sentezlendi. QRP'lerin içsel özellikleri, redoks merkezlerine etkili Zn2+ difüzyonunu kolaylaştırarak uzun vadeli döngü kararlılığını sağlar. QRP-1 ve QRP-2 sırasıyla 0.1 mA g-1 akım yoğunluğunda 180 mA h g-1 ve 134 mA h g-1 deşarj kapasitesi gösterdi. QRP'ler, 2.0 A g-1 akım yoğunluğunda 10000 döngü boyunca olağanüstü döngü kararlılığı göstererek, QRP-1 ve QRP-2 için sırasıyla 42 mA h g-1 ve 104 mA h g-1 olmak üzere oldukça yüksek final kapasiteleri elde edildi. Bu çalışmanın, kinon bazlı konjuge polimerik malzemelerin çinko-iyon piller için etkili katot malzemeleri olarak potansiyelini gösterdiğine ve enerji depolama alanında çalışan araştırmacılarının dikkatini çekeceğine inanıyoruz.Master Thesis Exploring the Electronic and Magnetic Characteristics of Lithiated Holey Mo8s12: a Study in Inorganic Chemistry(2023) Tan, Fırat; Büyükçakır, Onur; Şahin, HasanSince graphene, the ultra-thin carbon compound, gained popularity with its remarkable electrical capabilities, various two-dimensional (2D) van der Waals-type materials have come into focus. Investigation of the electrical and optical properties of materials at atomic scale is required to understand the unique electronic behavior brought on by quantum size effects. The development of optoelectronic devices with novel features is facilitated by an increased understanding of the properties of matter within the context of theoretical techniques. This thesis includes the investigation of the lithiated holey Mo8S12 structure through calculations based on density functional theory (DFT). Motivated by the recent experimental realization of holey structure of transition metal dichalcogenides (TMDs), in this thesis, the holey structure of Mo8S12 is investigated by means of DFT-based calculations. The geometry optimization and phonon band dispersion calculations show the structural and dynamical stability of free-standing holey single-layer Mo8S12. In addition, electronic band dispersions reveal the direct band gap semiconducting nature of the structure. In order to investigate the lithiation capacity of single-layer Mo8S12, effect of Li doping on the properties of Mo8S12 is analyzed by considering both one- and double-sided lithiation. As one surface of single-layer Mo8S12 is fully saturated with Li atoms, a dynamically stable half-metallic structure is formed. The corresponding electronic band structures reveals the metallic behavior of the two-side lithiated single-layer. Overall, tunable electronic properties of single-layer holey Mo8S12 via lithiation makes it suitable candidate for various nanoelectronic applications, such as memories, capacitors, gate insulators, energy storage, high-frequency modulation in communication devices.Article Citation - WoS: 111Citation - Scopus: 97A General Approach To Composites Containing Nonmetallic Fillers and Liquid Gallium(American Association for the Advancement of Science, 2021) Wang, Chunhui; Gong, Yan; Cunning, Benjamin, V; Lee, Seunghwan; Le, Quan; Joshi, Shalik R.; Büyükçakır, OnurWe report a versatile method to make liquid metal composites by vigorously mixing gallium (Ga) with non-metallic particles of graphene oxide (G-O), graphite, diamond, and silicon carbide that display either paste or putty-like behavior depending on the volume fraction. Unlike Ga, the putty-like mixtures can be kneaded and rolled on any surface without leaving residue. By changing temperature, these materials can be stiffened, softened, and, for the G-O-containing composite, even made porous. The gallium putty (GalP) containing reduced G-O (rG-O) has excellent electromagnetic interference shielding effectiveness. GalP with diamond filler has excellent thermal conductivity and heat transfer superior to a commercial liquid metal-based thermal paste. Composites can also be formed from eutectic alloys of Ga including Ga-In (EGaIn), Ga-Sn (EGaSn), and Ga-In-Sn (EGaInSn or Galinstan). The versatility of our approach allows a variety of fillers to be incorporated in liquid metals, potentially allowing filler-specific fit for purpose materials.