Yasemin Gündoğdu

Selcuk University · Department of Computer Technologies

The atomic layer deposition (ALD) technique has attracted significant attention due to it enables the control of film synthesis at the sub‐nanometre scale. In this study, we have prepared Molybdenum oxide (MoO3) ultrathin films using the ALD system through Bis(t‐butylimido)bis(dimethylamino)molybdenum (VI) as a Molybdenum (Mo) source. To understand...

Cu2ZnSnS4 (CZTS) thin films in 61 nm, 112 nm, 242 nm and 313 nm thickness which have been produced by Pulsed Laser Deposition (PLD) on Soda Lime Glass substrates as a function of the number of laser pulses. As the deposition of ablated material has been augmented with increasing number of laser pulses, it has been noticed that CZTS-ultrathin film’s...

In this study, eco‐friendly superhydrophobic (SH) and superoleophilic (SO) poly (3‐hydroxybuthyrate) (PHB)‐SiO2 bio‐nanofiber membrane has been successfully fabricated for oil–water separation. Firstly, silica nanoparticles (SiNPs) have been synthesized via green laser ablation technique. It was placed into PHB matrix in different contents by contr...

In this study, firstly, 4-(2-(benzhydryloxy)phenoxy)phthalonitrile compound was synthesized. Then, a new 2, 10, 16, 24–tetrakis (2-(benzhydryloxy) phenoxy phthalocyaninato) zinc (II) complex was synthesized. The characterization of the obtained structure was investigated using spectroscopy techniques, including mass, nuclear magnetic resonance, inf...

In this work, Poly(ε-caprolactone) (PCL) and gold(Au) nanocomposite has been fabricated by pulsed laser ablation (PLA) of gold target dipped in PCL solution performed by aid of Ti: Sapphire femtosecond (fs) laser to form nanoparticles (NPs). The prepared sample have been investigated by various analyses techniques to evaluate their elemental compos...

In this study, the hemp stem (cannabis) nanofibers have been produced employing the electrospinning method by changing parameters including voltage, and deposition time. The nanosized particles of hemp stems have been mechanically produced by ball milling technique. The powder hemp stem obtained by ball-milling have been prepared in polyacrylonitri...

CuInGaSe2 (CIGS) nanocrystal (NC) thin film is used for the development of optoelectronic devices as solar cell due to its prominent properties, such as high conversion efficiency and environmentally friendly structure. In the current study, CIGS NC thin film was prepared at four different thin film thickness including 52 nm, 89 nm, 183 nm and 244...

In this work, ZnO thin films have been produced on p-Si wafer depending on number of laser pulses applied using pulse laser deposition (PLD) technique at room temperature conditions. Three different thicknesses of ZnO thin films (ZnO1, ZnO2 and ZnO3) have been produced by applying 18,000, 36,000 and 54,000 laser pulses and thicknesses of these prod...

Development of new materials such as CuNiCoS4, CuCo5S8, CuCo2S4 are some important candidates which have potential nonlinear optical applications in photonics such as multiphoton spectroscopy/microscopy, laser technology etc. In this study, ternary and quaternary structured group members CuNiCoS4, CuCo5S8, CuCo2S4 quantum dots (QDs) were synthesize...

This study aimed to investigate the effects of different femtosecond (fs) laser treatment protocols on the surface roughness (Ra) and shear bond strength (SBS) of resin cement to zirconia. A total of 110 zirconia specimens were divided into 11 subgroups according to the surface treatment: Control (C), Airborne‐particle abrasion (APA), laser irradia...

PurposeThe present study aimed to investigate the impact of a femtosecond laser and Er:YAG laser as an alternative to orthophosphoric acid etching on the shear bond strength.Methods Thirty permanent mandibular teeth were assigned to one of three groups based on the treatment performed on their buccal/lingual surfaces. Group I, 37% orthophosphoric a...

Material science is one of the decisive tools towards engineering versatile compounds for numerous technological applications. Over the last decades, thiospinels have been attracting great interest due to their unique characteristics and potential utilizations offering innovative and interesting features. The characteristics of these transition met...

In this study, CIGS ultrathin films of 52 nm, 89 nm, 183 nm and 244 nm thicknesses were grown on a n-Si substrate using PLD technique, then Ag/CIGS/Si/Al hetero-junction solar cells were formed by producing front finger and back contact. While the thickness of CIGS ultrathin film is increased, their grain sizes are also increased, crystal structure...

In cancer treatment, surgery and radiotherapy methods have been used in developed countries. Electrons or photons produced by linear accelerators are commonly applied on treatment of tumors in radiotherapy methods. In recent years, the hadron therapy method using proton or carbon ions is rapidly improved and used in radiation oncology. This therapy...

This study aimed to investigate the effects of femtosecond laser (Fs) and/or air-abrasion protocols on surface roughness (Ra) of zirconia and resin bond strength. Eighty zirconia samples were randomly divided into eight subgroups according to surface treatment protocols: Control (C), Air-abrasion before sintering (ABS), Air-abrasion after sintering...

Core/shell Colloidal Quantum Dots (CQDs) are of interest for nonlinear photonic applications due to their unique properties. In this work, firstly CdTe/CdSe Quasi Type-II Colloidal Quantum Dots with an average core size of 3.54 nm and four different shell thicknesses (1.8 nm, 2.7 nm, 3.2 nm and 3.8 nm) were synthesized and characterized using UV–Vi...

The dissociative ionization processes of heptane molecule with nine isomers have been investigated and presented experimentally in detail by courtesy of femtosecond laser mass spectrometry technique with a fundamental wavelength of 800 nm and 90 fs pulse duration in this study. It has been aimed to show that the classification of heptane isomers us...

In this study, rhenium/rhenium oxide nanoparticles (Re / ReO3 NPs) have been produced for the first time in ultrapure water by using Femtosecond Pulsed Laser Ablation in Liquid (fsPLAL) method. X-Ray Diffraction (XRD) measurements and results obtained for NPs show the existence of well-crystallized peaks and preferred phases. Re NPs have hexagonal...

In this study, Cu2ZnSnS4 nanocrystal and its constituents’ copper, zinc and tin were grown separately by pulsed laser deposition technique as thin films, and their linear and nonlinear optical properties have been investigated. Linear optical properties were analysed with UV–Vis absorption spectra. Elemental composition of Cu2ZnSnS4 thin films was...

Photodynamic therapy (PDT) is a photo chemotherapeutic strategy that is the application of photosensitizing agent and light on disease or tumor site. The aim of this study is to confirm the feasibility for femtosecond (fs) laser for aminolevulinate (ALA) mediated PDT on skin, breast and bladder cancer cells. Also the remarkable aspects of ALA media...

In this study, the thin films were produced by using pulsed laser deposition (PLD) technique from gold (Au) nanoparticles deposited on two kinds of substrates under different argon (Ar) gas pressure. Microscope glass slides and silicon (100) wafers were used as amorphous and crystal substrates. The films were deposited under 2 × 10−3 mbar, 1 × 10−2...

In this study, CdSe/CdTe Type-II quantum dots (QDs) were synthesized using dropwise method. The core/shell nanocrystals have been characterized by UV–Vis absorption and photoluminescence (PL) spectroscopies, transmission electron microscopy and z-scan technique. Nonlinear properties of each type of quantum dots were studied using femtosecond(fs) z-...

Distinguishing chemicals and improvement on analytical methods has a direct impact on modern chemical analysis. In this work, the dissociative ionization of xylene isomers was investigated using a femtosecond laser mass spectrometry (FLMS) method with a custom-built linear time-of-flight (TOF) instrument. Laser beams at 800 nm and 400 nm were used...

Cancer is one of worldwide diseases at the present time. Therefore, scientists are performing intense efforts to prevent and early detection of cancer types. One of the most common types of cancer is colon cancer. In this regard, on time diagnosis paves a new avenue for the treatment process resulting in a healthy individual. Femtosecond (fs) laser...

In this work, we have investigated the xylene isomers in concepts of vertical and adiabatic ionization energy parameters and molecular orbital (HOMO-1, HOMO/SOMO, LUMO, LUMO+1) energies of the neutrals and singly charged cation radicals. As a first step of the calculations, conformational analysis has been performed for all isomers using the semi-e...

The nanoparticle production has a significant importance because of its unique optical properties in molecular biology and medicine. Plasmonic metallic nanoparticles are widely used in cancer monitoring studies as contrast agents on the account of their surface plasmon resonance (SPR) effect. Beside, silicon (Si) semiconductor nanoparticles can pro...

In this work, the nonlinear optical properties of Zinc Oxide (ZnO) thin films produced on microscope slide glass substrates at room temperature (RT) using Pulsed Laser Deposition (PLD) method has been presented. PLD system consists of a vacuum chamber (pumped by a turbo molecular pump, backed with a rotary pump), rotating sample and substrate holde...

Background: Femtosecond laser mass spectrometry (FLMS) has become an important tool for investigation of chemical and biological materials in many areas from medical to industrial. Objective: In medicine, the morphological examination of tissues is determined by performing pathological investigations under microscope. However, some novel improve...

Xylenol is a phenolic chemical substance having two methyl groups and one hydroxyl group attached to benzene ring and has six isomers. 2,4-xylenol is only isomer of xylenol molecule that is in liquid phase while remaining isomers are all in a crystal form at room temperature. In the scope of this study, we have experimentally investigated ionizatio...

Achieving adhesion between resin cement and zirconia requires pretreatment of the surface. This in vitro study aimed to evaluate the effect of femtosecond laser beam angle and the shape of the formed surfaces, on the roughness and shear bond strength (SBS) of resin cement to zirconia ceramic. Seventy Y-TZP ceramic specimens were divided into seven...

zet Farklı yapıdaki sıvı kristallerin, organik malzemelerin ve saydam optik malzemelerin; lineer olmayan soğurma (NLA) ve lineer olmayan kırılma (NLR) gibi optik özelliklerinin belirlenmesi amacıyla geniş çaplı uygulamalar ve güvenilir yöntemler geliştirilmiştir. Z-tarama metodu, yoğunlaşmış ışık demeti boyunca incelenecek malzemeyi yatay bir düzle...

In this work, we have carried out a detailed statistical analysis of the experimental data on mass spectra using Principle Component Analysis (PCA) to identify some molecular isomers which cannot be distinguished using conventional statistical methods for interpretation of mass spectra. Experiments have been carried out using a TOF-MS in connection...

Z-scan is easy to apply and reliable technique which is used to calculate nonlinear refractive index and nonlinear absorption coefficient of optical and photonic devices. In this work, nonlinear refractive index and nonlinear absorption coefficient of gold thin films are presented. Thin film produced by our group using Pulsed Laser Deposition (PLD)...

In this study, laser ablation threshold fluence value of gold and silver bulk targets and thin films of same metals deposited on glass by Pulsed Laser Deposition (PLD) have been calculated using Diagonal Scan (D-scan) method.

In this study, Cn cluster moleculer ions and especially C60 fullerene molecule have been produced and analysed using high power fs laser system connected to a TOF-MS. Additionally, peak distribution in mass spectra have been presented depending on laser power. The Cn + (n=1….24) cluster iyons in the fragmentation pattern of C60 molecule and parent...