Sağlam, Özge
Loading...
Profile URL
Name Variants
Saglam, OEzge & Saglam, Özge & Saglam, Ozge
Job Title
Email Address
ozge.saglam@ieu.edu.tr
Main Affiliation
05.10. Mechanical Engineering
Status
Current Staff
Website
ORCID ID
Scopus Author ID
Turkish CoHE Profile ID
Google Scholar ID
WoS Researcher ID
No research topics data found.
Sustainable Development Goals
1NO POVERTY
0
Research Products
2ZERO HUNGER
0
Research Products
3GOOD HEALTH AND WELL-BEING
2
Research Products
4QUALITY EDUCATION
0
Research Products
5GENDER EQUALITY
0
Research Products
6CLEAN WATER AND SANITATION
0
Research Products
7AFFORDABLE AND CLEAN ENERGY
2
Research Products
8DECENT WORK AND ECONOMIC GROWTH
0
Research Products
9INDUSTRY, INNOVATION AND INFRASTRUCTURE
3
Research Products
10REDUCED INEQUALITIES
0
Research Products
11SUSTAINABLE CITIES AND COMMUNITIES
0
Research Products
12RESPONSIBLE CONSUMPTION AND PRODUCTION
1
Research Products
13CLIMATE ACTION
1
Research Products
14LIFE BELOW WATER
0
Research Products
15LIFE ON LAND
0
Research Products
16PEACE, JUSTICE AND STRONG INSTITUTIONS
0
Research Products
17PARTNERSHIPS FOR THE GOALS
0
Research Products
Documents
29
Citations
734
h-index
12
Documents
34
Citations
794
No records found in other affiliations.
Scholarly Output
20
Articles
15
Views / Downloads
145/141
Supervised MSc Theses
3
Supervised PhD Theses
0
WoS Citation Count
169
Scopus Citation Count
127
Patents
0
Projects
7
WoS Citations per Publication
8.45
Scopus Citations per Publication
6.35
Open Access Source
9
Supervised Theses
3
| Journal | Count |
|---|---|
| Colloıds And Surfaces A-Physıcochemıcal And Engıneerıng Aspects | 2 |
| Chemıcal Communıcatıons | 1 |
| ChemnNanoMat | 1 |
| ChemPlusChem | 1 |
| Colloids and Surfaces A: Physicochemical and Engineering Aspects | 1 |
Current Page: 1 / 3
Scopus Quartile Distribution
Competency Cloud
20 results
Scholarly Output Search Results
Now showing 1 - 10 of 20
Article Citation - WoS: 10Citation - Scopus: 11Upconversion Properties of Tm3+-Er3+ Co-Doped Layered Perovskites and In-Vitro Cytotoxicity of Their Exfoliated Nanomaterials(Elsevier, 2021-03) Gunay, Bensu; Sariyar, Ece; Unal, Ugur; Karagonlar, Zeynep Firtina; Saglam, Ozge; Firtina Karagonlar, ZeynepThe upconversion behavior of Er3+/Tm3+ co-doped Ruddlesden-Popper type K(2)Ln(2)Ti(3)O(10) layered perovskites was investigated. The lanthanide pair was selected for achieving 980 nm-driven green, red, and NIR emission. The perovskites having different dopant compositions were synthesized by a conventional solid-state procedure by substitution of La3+ ions in the host lattice. Moreover, the single nanosheets having approximately 1.8 nm thickness and 2 mu m lateral size were obtained via chemical exfoliation. The non-doped and co-doped layered materials and the nanosheets derived from these materials were characterized by X-ray diffraction, Scanning Electron Microscopy, Atomic Force Microscopy and custom-made experimental set-up of upconversion emission spectroscopy. According to the XRD profiles, the perovskites had the layered orientation and water molecules in the interlayer domain because of their hygroscopic nature. The co-doped layered perovskites presented twophoton excited green and red emissions, identified as S-4(3/2) -> (4)I(15/2 )with H-2(11/2) -> (4)I(15/2 )and F-4(9/2) -> I-4(15/2) of the Er3+ transitions with a NIR emission. The intensity of red to green ratio emission of the materials increased with respect to the co-dopant concentration. The nanosheets' upconversion emission was weak in the visible region compared to their layered morphology. On the other hand, the NIR emission based on H-3(4) -> H-3(6) transition of the Tm3+ ions was preserved despite the acid and solvent treatments to break apart the layered orientation. MTT assay and Calcein/PI staining were conducted to evaluate cytotoxicity of non-doped and Er3+/Tm3+ co-doped K(2)Ln(2)Ti(3)O(10) perovskites and their exfoliated nanosheets on HEK 293 and HepG2 cell lines. Both assays indicated that although cell viability decreases with increasing concentration, good cell viability was observed at even 100 mu g/mL. In addition to their excellent luminescent and optical features, the nanomaterials also demonstrated low cytotoxicity increasing the potential for their use in laser-based biological applications.Master Thesis 2d Perovskite Nanosheets for Multifunctional Device Fabrication and Biological Applications(İzmir Ekonomi Üniversitesi, 2021) Günay, Bensu; Sağlam, Özge; Karagonlar, Zeynep FırtınaBu tezin amaçları, frekans yükseltme özelliğine sahip nanolevhalar kullanılarak yapılandırılmış çok işlevli bir cihaz tasarımı ve biyolojik uygulamalar için iki boyutlu nanolevhaların biyouyumluluğunun araştırılmasıdır. K2Ln2Ti3O10 yapıda katmanlı perovskitler frekans yükseltme ile kırmızı ışıma elde edebilmek için farklı sitokiyometrik oranlarda Tm3+/Er3+ iyonları ile katkılandırılarak sentezlenmiştir. 2.5% Tm3+-20% Er3+ ile katkılı katmanlı malzemenin yanal boyutu 300 nm ile 2.5 µm arasında elde edilmiştir. Nanolevhaların kalınlığı 2-3 nm arasında belirlenmiştir ve tek nanolevhaların başarılı bir şekilde elde edildiği gösterilmiştir. Frekans yükseltme özelliğine sahip Tm3+/Yb3+ ve Er3+/Yb3+ ile katkılı nanolevhalar katman-katman tekniği ile 20 kez kaplanmıştır ve hazırlanan filmler sırasıyla 1G4 ›3H6 geçişi ile mavi ışıma ve 4S3/2›4I15/2 ve 2H11/2›4I15/2 geçişleri ile yeşil ışımalar göstermiştir. Öte yandan, Tm3+/Er3+ ortak katkılı nanolevha yapılı filmler, frekans yükseltme işlemi sırasında kırmızı ve yeşil emisyon sergilemiştir. Er3+/Yb3+ ortak katkılı nanolevhaların biriktirilmiş filmleri durumunda, yeşil ve kırmızı frekans yükseltme emisyonlarında iki foton süreçleri yer almıştır. 60 katman ile üretilen filmler ayrıca üç farklı nanolevhalar kullanılarak hazırlanmıştır. Film oluştururken nanolevhaların kombinasyonu CIE diagramında beyaz emisyon sergilemiştir. Ayrıca nanolevhaların sitotoksisitesi HepG2 ve HEK 293 hücre hatları kullanılarak analiz edilmiştir. HEK 293 hücre hattı için Tm3+/Er3+ katkılı katmanlı malzemenin toksisitesi %45,7 iken, nanolevhaların toksisitesi %73,6 olarak belirlenmiştir.Article Citation - WoS: 11Citation - Scopus: 11Isomerism Control of Diethylstilbestrol by Metal Surface Induced O-H Cleavage(Royal Soc Chemistry, 2018) Oh, Seung Cheol; Lloyd, Julian A.; Fischer, Sybille; Saglam, OEzge; Papageorgiou, Anthoula C.; Diller, Katharina; Duncan, David A.Diethylstilbestrol (DES) is studied on Ag(111) and Cu(111) surfaces using X-ray photoelectron spectroscopy (XPS) and scanning tunnelling microscopy (STM). We find that DES molecules on the silver surface adsorb intact and adopt a trans-conformation. On the more reactive copper surface, O-H bond cleavage results in molecular adsorption in the cis-conformation, thus providing the means of obtaining different adsorption geometries. The difference in isomerism is reflected in the observed self-assemblies which exhibit room-temperature stability.Article Citation - WoS: 12Tuning the Ease of Formation of On-Surface Metal-Adatom Coordination Polymers Featuring Diketones(Royal Soc Chemistry, 2018) Papageorgiou, Anthoula C.; Li, Jiang; Oh, Seung Cheol; Zhang, Bodong; Sağlam, Özge; Guo, Yuanyuan; Reichert, JoachimWe use pyrene-4,5,9,10-tetraketone molecules with substituents of varying bulkiness in the 2,7 positions to probe the generality and versatility of the previously reported on-surface coordination of two diketones with a single metal atom, leading to one-dimensional coordination polymers. Three different low index surfaces of group 11 metals (Cu, Ag and Au) are used to provide both the support and the metal atoms for metal-organic coordination. By real space visualisation with single molecule resolution employing scanning tunnelling microscopy we investigate the molecular self-assembly and show how this can be substantiated with the formation of metal-organic linear and cyclic oligomers, depending on the employed substrate.Article Citation - WoS: 1Effect of Uv Light Exposure Duration on the Removal of Exfoliation Agent Residues in Two-Dimensional Perovskite Nanosheets: an Afm Study(John Wiley and Sons Inc, 2025-02-06) Gördesli Duatepe, Fatma Pınar; Küçükcan, Begümnur; Sağlam, Özge; Pinar Gordesli-Duatepe, Fatma; Gordesli-Duatepe, Fatma PinarAccurate determination of dielectric properties and surface characteristics of two-dimensional (2D) perovskite nanosheets, produced by chemical exfoliation of layered perovskites, is often hindered by exfoliation agent residues such as tetrabutylammonium (TBA). This study investigated the effect of ultraviolet (UV) light exposure duration on the removal of TBA residues from 2D Ca2NaNb4O13− nanosheets deposited on silicon substrates via Langmuir-Blodgett method using atomic force microscopy (AFM). Nanoscale adhesion forces between silicon AFM tips and nanofilms exposed to UV light for 3, 12, 18, and 24 hours were measured. Nanofilms exposed to UV for 12 hours showed significant heterogeneity in adhesion forces compared to control nanofilms not exposed to UV. This heterogeneity improved after 18 hours and reached maximum homogeneity at 24 hours. A noticeable decrease in adhesion forces indicated a reduction in TBA residues after 18 hours, with further reduction observed at 24 hours. The most probable adhesion forces for control nanofilms and those exposed to UV for 3 and 12 hours were 1.6-fold and 2.0-fold higher, respectively, compared to nanofilms exposed to UV for 18 and 24 hours. Similarly, surface roughness peaked at 12 hours and then decreased with longer exposure, resulting in a smoother surface at 24 hours. © 2025 The Author(s). ChemPlusChem published by Wiley-VCH GmbH.Article Flexible Transparent Nanocapacitors Based on High-k Perovskite Nanosheets(Wiley-v C H verlag Gmbh, 2025-08-29) Kucukcan, Begumnur; Saglam, OzgeThis work explores the integration of 2D Ca2NaNb4O13 - perovskite nanosheets into ultrathin dielectric films for flexible and transparent capacitors. Using Langmuir-Blodgett assembly technique, uniform nanofilms with precise thickness control are deposited on indium tin oxide-coated polyethylene terephthalate substrates. Capacitors fabricated with 10 and 20 layers of these nanosheets demonstrate stable dielectric performance and low leakage currents even under mechanical bending, offering capacitance densities of 0.42 and 0.27 mu F cm-2, respectively. Surface and interface characterization confirms the high-quality film formation and effective removal of exfoliation residues. Despite challenges arising from substrate roughness, the results validate the potential of oxide nanosheets for application in miniaturized, high-kappa flexible electronics.Review Citation - WoS: 23Citation - Scopus: 24Fighting Bacterial Pathogens With Carbon Nanotubes: Focused Review of Recent Progress(Royal Soc Chemistry, 2023) Asaftei, Mihaela; Lucidi, Massimiliano; Cirtoaje, Cristina; Holban, Alina-Maria; Charitidis, Costas A. A.; Yang, Fang; Wu, Aiguo; Sağlam, Özge; Stanciu, Stefan G.The fast and global spread of bacterial resistance to currently available antibiotics results in a great and urgent need for alternative antibacterial agents and therapeutic strategies. Recent studies on the application of nanomaterials as antimicrobial agents have demonstrated their potential for the management of infectious diseases. Among the diverse palette of nanomaterials currently used in biomedical applications, carbon nanotubes (CNTs) have gained massive interest given their many valuable properties, such as high thermal and electrical conductivity, tensile strength, flexibility convenient aspect ratio, and low fabrication costs. All these features are augmented by facile conjugation with functional groups. CNTs are currently available in many configurations, with two main categories being single-walled and multi-walled CNTs, depending on the number of rolled-up single-layer carbon atoms sheets making up the nanostructure. Both classes have been identified over the past years as promising antibacterial agents but the current level of understanding of their efficiency still harbors many pending questions. This mini-review surveys recent progress on the topic of antibacterial effects of CNTs and examines the proposed mechanisms of action(s) of different CNT typologies, placing the main focus on past studies addressing the antibacterial activity on Staphylococcus aureus and Escherichia coli, two prototypical Gram-positive and Gram-negative pathogens, respectively.Article Citation - WoS: 50Citation - Scopus: 54Synthesis of Pyrene-Fused Pyrazaacenes on Metal Surfaces: Toward One-Dimensional Conjugated Nanostructures(Amer Chemical Soc, 2015-12-14) Jiang, Li; Papageorgiou, Anthoula C.; Oh, Seung Cheol; Sağlam, Özge; Reichert, Joachim; Duncan, David A.; Zhang, Yi-QiWe investigated the synthesis of one-dimensional nanostructures via Schiff base (imine) formation on three close-packed coinage metal (Au, Ag, and Cu) surfaces under ultrahigh vacuum conditions. We demonstrate the feasibility of forming pyrene-fused pyrazaacene-based oligomers on the Ag(111) surface by thermal annealing of tetraketone and tetraamine molecules, which were designed to afford cyclocondensation products. Direct visualization by scanning tunneling microscopy of reactants, intermediates, and products with submolecular resolution and the analysis' of their statistical distribution in dependence of stoichiometry and annealing temperature together with the inspection of complementary X-ray photoelectron spectroscopy signatures provide unique insight in the reaction mechanism, its limitations, and the role of the supporting substrate. In contrast to the reaction on Ag(111), the reactants desorb from the Au(111) surface before reacting, whereas they decompose on the Cu(111) Surface during the relevant thermal treatment.Master Thesis A New Technique for Nanolithography Using Electrohydrodynamic Method and Argon Ion Etching Process(İzmir Ekonomi Üniversitesi, 2021) Döğer, Hilal; Sağlam, ÖzgeMikro ve nano yapı gerektiren cihazlar için çeşitli litografi teknikleri kullanılmaktadır. Günümüzde kullanılan litografi yöntemlerinde çok aşamalı prosesler veya yüksek maliyet sorunlarıyla karşılaşılabilmektedir. Çeşitli polimerlerden elde edilebilen ve yüksek elastikiyete sahip olan nanofiberler, cihaz geliştirmede sıklıkla kullanılmaktadır. Elektroeğirme yöntemi, nanofiberlerin istenilen kompozisyon ve çapta üretilebilmesi ve yakın mesafede kontrol edilerek desenlenebilmeleri nedeniyle, araştırmacılar tarafından sıklıkla tercih edilmektedir. Bu tezin amacı, elektrohidrodinamik yöntem ile üretilen nanofiberler ve argon iyon aşındırma işlemini kullanarak yeni bir tür nanolitografi tekniği geliştirmektir. İlk aşamada nanofiberler, termal buharlaştırma ile krom, gümüş ve altın ile kaplanmış silikon ve cam alttaşlar üzerine desenlendi. Sonrasında desenlenmiş yapılara sırasıyla argon iyon aşındırma ve polimer kaldırma işlemleri uygulanarak metalik desenler üretildi. Metalik desenlerin elektriksel karakterizasyonu, iki nokta ölçüm yöntemiyle gerçekleştirildi. Desenlerin morfolojisi, kaldırma işleminden önce ve sonra Atomik Kuvvet Mikroskobu ile elde edildi. Yapıların element analizi, Taramalı Elektron Mikroskobu-EDX ile yapıldı. Sistem parametrelerinin optimize edilmesiyle, nanofiberler ile alttaşlar üzerinde birbirine bağlı interdigitated yapıları içeren çeşitli metalik desenler başarılı bir şekilde üretildi. Sonuç olarak, nanofiberler önceki çalışmalarda kullanılmak için üretilirken, bu tezde nanofiberler bir araç olarak kullanılarak yeni bir nanolitografi yöntemi geliştirildi.Article Citation - WoS: 21In Vacuo Porphyrin Metalation on Ag(111) Via Chemical Vapor Deposition of Ru-3(co)(12): Mechanistic Insights(Amer Chemical Soc, 2016-04-18) Papageorgiou, Anthoula C.; Diller, Katharina; Fischer, Sybille; Allegretti, Francesco; Klappenberger, Florian; Oh, Seung Cheol; Saglam, OzgePorphyrin molecules offer a very stable molecular environment for the incorporation of numerous metal ions inside their cavity, which enables a plethora of applications. The fabrication and characterization of surface confined metal organic architectures by employing porphyrins are of particular interest. Here, we report on a comprehensive study of chemical vapor deposition (CVD) of triruthenium dodecacarbonyl as metal precursor for the on-surface metalation of different porphyrin species with Ru under ultrahigh vacuum conditions. By employing synchrotron radiation X-ray photoelectron spectroscopy (XPS), near edge X-ray absorption fine structure (NEXAFS), and scanning tunneling microscopy (STM), we investigated the metalation process and particularly the role of the support: the close packed Ag(111) surface. It was found that the surface is active in the metalation process under the employed conditions: it decomposes the metal precursor and delivers metal centers to the porphyrin macrocycles. The generality of the metalation process is illustrated for tetraphenylporphyrin, its high temperature derivatives, and porphine.