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    Biosensor properties of plasmonic silver nanoparticles produced by the pld mechanism
    (International Engineering, Science and Education Group, 2021) Candan, İlhan; Gezgin, Serap Yiğit; Gündoğdu, Yasemin; Gümgüm, Hadice Budak
    Plasmonic metal nanoparticles (NPs), such as Ag, Au, Cu NPs, attract great interest due totheir notable applications in biological, and chemical sensing. Researchers have studied the plasmonicmetal NPs which have exceptional optical properties in a large spectral region. Metal NPs form aunique surface plasmon resonance (SPR) peak that is in the electromagnetic spectrum’s visible part. The peak of SPR firmly depends on the NP’s size, shape, dielectric constant, and medium that theparticle is in. Light interacts with nanoparticles that are smaller than the wavelength of incident lightin localized surface resonance. That leads Localised Surface Plasmon Resonance (LSPR) in which anoscillating local plasma around the NP with a certain frequency form. The LSPR detection is the mostcommon method for wavelength shift measurement. Since analyte absorption causes a significant change on the value of local dielectric constant, the LSPR peak shifts. It is known that biologicalmolecules such as proteins and antibodies can sensitively be detected while they affect the localdielectric environment. Therefore, Ag or Au based metal NPs can be used as a sensor with the help ofLSPR wavelength shift technique. Among the metal NPs, Ag has a relatively higher refractive indexsensitivity. Moreover, Ag NPs generate measurements that are more precise since they have a shaperLSPR peak. In our work, we produce plasmonic Ag NPs with various sizes and spherical shapes bymaking use of the Pulsed Laser Deposition (PLD) mechanism. Subsequently, we have investigate theLSPR peaks of these NPs via the UV-Vis spectroscopy. Additionally, biosensor properties of plasmonicAg NPs are investigated by binding Protein A molecules to surface of the NPs. It is significant to mentionhere that we obtain an LSPR wavelength shift, which has a value around 100 nm/RIU.
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    Effect of microwave radiation on wet digestion of rock-sediment samples and comparison with conventional method
    (Chemical Publishing Co., 2015) Gümgüm, Hadice Budak
    The search for a rapid dissolution technique has lead several workers to investigate the use of a microwave oven as a heat source in a low temperature digestion system. In this study, three different copper ore samples from the Tigris river basin (Turkey) and the river sediment were digested by microwave radiation and recoveries of four elements (Co, Cu, Ni, Zn) were compared to those by the hot plate conventional method. The samples were digested with mixtures of hydrochloric acid, nitric acid and hydrofluoric acid. The concentrations of metal ions were determined by Perkin Elmer Optima 2100 DV inductively coupled plasma-optical emission spectrometry (ICP-OES). Analytic recoveries were equivalent to the standard hot plate method after a microwave digestion of only for few minutes.
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    Influence of Mn doping on electrical properties of TiO2/Si heterojunction diode
    (De Gruyter Open Ltd., 2023) Baturay, Şilan; Biçer, Ömer; Gezgin, Serap Yiğit; Candan, İlhan; Gümgüm, Hadice Budak; Kılıç, Hamdi Şükür
    In this special work, two types of material, which are undoped and Mn doped TiO2 thin films, have been produced by spin coating technique, and then their structural, morphological and optical properties have been measured at different Mn doping rates. Four different doping ratios, undoped, 1, 3 and 5% Mn doped TiO2 have been both experimentally and theoretically investigated and some significant enhancements have been reported. The results of X-ray diffraction (XRD) such as dislocation density, strain, and crystallite size have indicated that undoped, 1, 3 and 5% Mn doped TiO2 thin films had the phase of anatase at 450 °C. It has been observed that the peak intensity of 3% Mn doped TiO2 films has decreased compared to undoped and 1% Mn doped TiO2 while the peak intensity has increased for 5% Mn doped TiO2. The refractive indices and dielectric coefficients of the undoped and Mn doped TiO2 thin films have also been calculated. The undoped and Mn doped TiO2/p-Si heterojunction diodes has exhibited photosensitive behaviour in the illuminated environment. 1% Mn doped TiO2/p-Si heterojunction diode indicated the highest photocurrent. The electrical parameters of all diodes have been calculated and compared to the conventional J–V and Norde methods. Additionally, 1% Mn doped TiO2/p-Si heterojunction diode has been modelled by using the SCAPS-1D program, and J ph values have also been calculated based on the shallow donor density (N D ). The experimental and theoretical J ph values of this diode were found to be compatible with each other.
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    OPTICAL, MORPHOLOGICAL, STRUCTURAL, AND PHOTOCATALYTICAL PROPERTIES OF PLASMONIC AU NPS PRODUCED BY PULSED LASER DEPOSITION
    (Bilal GÜMÜŞ, 2024) Candan, İlhan; Gezgin, Serap Yiğit; Gümgüm, Hadice Budak; Kılıç, Hamdi Şükür
    Plasmonic Au NPs exhibit exceptional optical, morphological, and structural properties, making them promising materials for applications in photocatalysis, sensing, and energy conversion. This study explores the synthesis and characterization of plasmonic gold NPs produced by pulsed laser deposition, a versatile physical vapor deposition technique. Pulsed Laser Deposition enables precise control over NP formation through tunable parameters such as laser fluence, ambient gas environment, and deposition duration. The resulting NPs were systematically analyzed to evaluate their optical properties, including localized surface plasmon resonance, as well as their morphological and structural attributes. The localized surface plasmon resonance behavior of the synthesized Au NPs was found to be highly dependent on particle size, shape, and distribution, as revealed by UV-Vis spectroscopy and electron microscopy. Structural analysis via X-ray diffraction confirmed the crystalline nature of the NPs, with lattice parameters correlating to their stability and catalytic efficiency. Photocatalytic activity tests demonstrated that the gold NPs could effectively degrade organic pollutants under visible light, leveraging their strong LSPR-induced hot electron generation and charge transfer properties. In this study, gold NP thin film was produced on microscopic glass by Pulsed Laser Deposition system. Gold NPs thin film photocatalyst efficiency 95.00% and reaction rate constant 0.39 min-1 were calculated. At the end of 210 min, MB dye was degraded and turned into high transparency due to localized surface plasmon resonance property of gold NP. The findings may provide valuable insights into the design and application of plasmonic Au NPs in photocatalysis and other advanced technologies.
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    Puls Lazer Depozisyonu Yöntemiyle Üretilen Plazmonik Altın Nanoparçacıkların Sensör Özelliklerinin Araştırılması
    (Munzur Üniversitesi, 2024) Candan, İlhan; Gezgin, Serap Yiğit; Gümgüm, Hadice Budak; Kılıç, Hamdi Şükür
    Plazmonik altın nanoparçacıklar (Au NP'ler), özellikle Lokalize Yüzey Plazmon Re-zonansı (LSPR) sayesinde, sensör uygulamaları için ideal adaylar olarak öne çıkan üstün optik özelliklere sahiptir. Bu nanoparçacıklar, çevrelerindeki ortamdaki deği-şimlere karşı yüksek hassasiyet gösterir ve bu sayede moleküler etkileşimlerin ve çevresel değişimlerin hassas bir şekilde tespit edilmesini sağlar. Bu çalışmada, kim-yasal reaktiflere ihtiyaç duyulmadan parçacık boyutu, morfolojisi ve dağılımı üzerin-de hassas kontrol imkânı tanıyan temiz ve çok yönlü bir yöntem olan Puls Lazer De-pozisyonu (PLD) ile üretilen altın nanoparçacıkların sensör özellikleri incelenmiştir. PLD işlemi, ayarlanabilir plazmonik özelliklere sahip altın nanoparçacıklar üretmek için lazer akısı, puls süresi ve biriktirme süresi ayarlanarak optimize edilmiştir. Altın nanoparçacıkların yapısal ve optik özellikleri, taramalı elektron mikroskobu (SEM) ve UV-Vis spektroskopisi kullanılarak analiz edilmiş ve parçacık boyutu ile morfolo-jisinin biriktirme parametreleri ile kontrol edilebildiği doğrulanmıştır. Altın nano-parçacıkların sensör performansı, çevrelerindeki ortamın kırılma indisi değişimlerine duyarlılıklarını gösteren LSPR ölçümleri ile değerlendirilmiştir. Özellikle, LSPR piki, protein A dâhil çeşitli analizlere maruz bırakıldığında 50 nm dalga boyu kayması ile ölçülmüş ve bu nanoparçacıkların biyosensör uygulamaları için yüksek hassasiyete sahip olduğunu göstermiştir. Sonuçlar, PLD ile üretilen altın nanoparçacıkların gerçek zamanlı algılama ve çevresel izleme için umut vadeden sensör özelliklerine sahip ol-duğunu ve geniş bir sensör uygulama yelpazesi için verimli ve yeniden üretilebilir bir platform sunduğunu göstermektedir.
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    Thermal and spectral characterization of Co(II) and Cu(II) dinonyldithiophosphates: Removal of Co(II) and Cu(II) from Aqueous Solutions
    (Chemical Publishing Co., 2015) Gümgüm, Hadice Budak; Biricik, Nermin
    Dinonyldithiophosphoric acid (HDDTP) was prepared by addition of phosphorus pentasulphide to nonyl alcohol. Dinonyldithiophosphate complexes of Co(II) and Cu(II) with general formula [M(DDTP)2] [M = Co(II) or Cu(II)] were prepared by mixing solutions of M(II) with dinonyldithiophosphoric acid in ethanol at room temperature. The acid and its complexes were caharacterized by elemental analysis and infrared, ultraviolet-visible and inductively coupled plasma-optical emission spectrometry. The thermal behaviour of M(DNDTP)2 was investigated by thermogravimetric analysis under a nitrogen atmosphere. Removal of Co(II) and Cu(II) from aqueous media by dinonyldithiophosphoric acid solutions were investigated. The optimum conditions for extraction, such as the organic solvent, pH of the aqueous phase, time of equilibration, concentration and effect of anions, were studied. It was found that dinonyldithiophosphoric acid is an effective substance for removing Cu(II) and Co(II) from aqueous solutions.