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Öğe Influence of the Cation on the Surface Electronic Band Structure and Magnetic Properties of Mn:ZnS and Mn:CdS Quantum Dot Thin Films(The Journal of Physical Chemistry C, 2019-09-17) HOROZ, Sabit; YOST, Andrew; EKANAYAKA, Thilini; GURUNG, Gautam; RİMAL, Gaurab; TANG, Jinke; TULA, Paudel; CHIEN, Teyu…Öğe STUDIES ON CATALYTIC BEHAVIOR OF Co–Cr–B/Al2O3 IN HYDROGEN GENERATION BY HYDROLYSIS OF NaBH4(Digest Journal of Nanomaterials and Biostructures, 2019-10-04) İZGİ, M. Sait; BAYTAR, Orhan; ŞAHİN, Ömer; HOROZ, SabitIn this present study, the chemical reduction technique was used to synthesize Al2O3 supported Co-Cr-B catalyst (Co-Cr-B/Al2O3). The effects of the concentration of NaBH4, NaOH, amount of catalyst, ratio of metal/ Al2O3and temperature were discussed in detail. The results show that the reaction rate of hydrolysis first rises up and then goes down subsequently with the increase of NaBH4 concentration, as well as the concentration of NaOH. It was observed that the hydrogen generation rate increases with the molar content of metal changing from 2.5% to 5 wt%. However, when the metal/Al2O3 molar ratio is located from 5% to 20 wt%, the rate of hydrogen generation goes down. The hydrolysis kinetic order and the activation energy (????) of NaBH4 in the presence of Co-Cr-B/Al2O3 catalyst were found as 0.15 and 37.34 kJ*mol-1 , respectively. According to the results obtained, Co-Cr-B/Al2O3 catalyst can be used as a promising material in PEMFC mobile systems.Öğe A STUDY ON THE STRUCTURAL, OPTICAL AND PHOTOVOLTAIC PROPERTIES OF Fe(II) SCHIFF BASE COMPLEX WITH 5 AMINO-2,4- DICHLOROPHENOL-3,5-DITERTBUTHYSALISYLALDIMINE LIGAND(Digest Journal of Nanomaterials and Biostructures, 2019-04-02) KILINÇ, Dilek; ŞAHİN, Ömer; HOROZ, SabitIn our present study, 5 amino-2,4-dichlorophenol-3,5-ditertbuthysalisylaldimine ligand was synthesized and we used this ligand to prepare its-Fe(II) complex with using the wet chemical method. The structural, optical and electronic properties of Fe(II) Schiff base complex with ligand were characterized using the x- ray diffraction (XRD), optical absorption and Fourier transform- infrared (FT-IR) measurements, respectively. The structure of Fe(II) Schiff base complex with ligand was determined as a monoclinic crystal system. Two absorption bands were observed in the UV-visible region. They are assigned to intraligand and charge transfer transitions, respectively. The FT-IR spectra of Fe(II) Schiff base complex with ligand are similar to the ligand spectra. Despite the similarity, a shift toward higher frequencies was observed in the vibration modes of azomethine groups. Furthermore, Fe(II) Schiff base complex was used as a photosensitizer on TiO2 film in a DSSC device. Thus, the effect of Fe(II) Schiff base complex on the efficiency of DSSC device was investigated and photovoltaic parameters such as power conversion efficiency (?), open circuit voltage (VOC) and short circuit current density (JSC) were determined. The obtained JSC and VOC value for samples is 3.75mA/cm2 and 600 mV, respectively. The ? % value was calculated as 0.80. Our result leads to obtain improved conversion efficiency of Fe(II) Schiff base complex with ligand based DSSC device.Öğe Synthesis and photovoltaic application of ZnS: Cu (3%) nanoparticles(Journal of the Australian Ceramic Society, 2019-06-10) AYİM-OTU, Benjamin; KUNCAN, Melih; ŞAHİN, Ömer; HOROZ, SabitThe wet chemical method was used to prepare ZnS:Cu (3%) nanoparticles. The capping agent (mercaptoethanol) was handled during the synthesis process. To investigate the photovoltaic properties of ZnS:Cu (3%) nanoparticles synthesized via the wet chemical method, the incident photon to electron conversion efficiency (IPCE) measurement was performed. The IPCE (%) value at 400 nm was found as 5.12. This result shows that successfully synthesized ZnS:Cu (3%) nanoparticles can be used as promising sensitizers in solar cell technology. The energy band gap value of ZnS:Cu (3%) nanoparticles with cubic structure was determined as approximately 3.92 eV. In this study, it is emphasized that it is possible to develop both photovoltaic properties and optical properties of ZnS nanoparticles by using additive metal.Öğe Synthesis and properties of Schiff base Fe (II) complex(Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2019-09-19) KILINÇ, Dilek; ŞAHİN, Ömer; HOROZ, SabitIn our current study, Fe (II) complex with 4-4'-methylene bis (2,6-diethyl) aniline-3,5-di-tert-butylsalisilaldimine (HL1) ligand was synthesized by chemical method and the synthesized Fe (II) complex with HL1 ligand was named as Fe(L1)2 complex. Structural, morphological, electronic absorption and photovoltaic properties of Fe(L1)2 complex were characterized by x-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscope, electronic absorption, and current density (J)–voltage (V) measurements, respectively. The obtained result from the J-V measurement shows that Fe(L1)2 complex synthesized by the chemical method can be used as a promising sensitizer for a dye-sensitized solar cell.Öğe Synthesis of novel tetra (4-tritylphenoxy) substituted metallophthalocyanines and investigation of their aggregation, photovoltaic, solar cell properties(Inorganic and Nano-Metal Chemistry, 2019-01-02) GÜNDOĞDU SOLĞUN, Derya; HOROZ, Sabit; AĞIRTAŞ, MEHMET SALİH4-(4-tritylphenoxy) phthalonitrile was synthesized and characterized. Copper, zinc and cobalt phthalocyanines were obtained by reaction of 4-(4-tritylphenoxy)phthalonitrile with CuCl2, ZnCl2, CoCl2 metal salts. New compounds were characterized by using electronic absorption, nuclear magnetic resonance spectroscopy, infrared. The aggregation investigation for phthalocyanine complexes carried out in different concentrations tetrahydrofuran. Copper, cobalt and zinc phthalocyanines were used as sensitizers in dye-sensitized solar cell structures (DSSC) by growing on TiO2 coated on FTO (Fluorine doped Tin Oxide) conductive glass substrates. Current density (J) versus voltage (V) measurements were applied to investigate the photovoltaic properties of the synthesized complexes. The calculated power conversion efficiencies (g%) of the complexes using the obtained current density (J) versus voltage (V) curves show that these devices can be used as promising sensitizers in solar cell applications.Öğe Synthesis of PbS: Mo (3%) thin film and investigation of its properties(Journal of Materials Science: Materials in Electronics, 2019-03-11) ŞAHİN, Ömer; EKİNCİ, Arzu; HOROZ, SabitPure PbS and PbS:Mo(3%) thin films were synthesized on glass substrates at room temperature using the chemical bath deposition (CBD) method. The main purpose of this study is to examine the effect of the Mo additive metal on the crystallite size, optical energy band gap and photovoltaic properties of the PbS semiconductor thin film. Although the structure of PbS:Mo(3%) thin film was the same as the pure PbS, the crystallite size of PbS:Mo(3%) thin film (24.12 nm) was found to be lower than that of pure PbS (25.97 nm). The band gap values of PbS and PbS:Mo(3%) thin films were obtained as 1.89 eV and 1.91 eV, respectively. The possible reason for the increase in the energy band gap of PbS:Mo(3%) thin film is the incorporation of Mo6+ ions into the PbS lattice. Photovoltaic properties of PbS and PbS:Mo(3%) thin films synthesized on Zn2SnO4 coated on FTO conductive glasses via CBD technique were investigated using the IPCE and J–V measurements. The IPCE (%) values obtained at 400 nm for the pure PbS and PbS:Mo(3%) thin films were 35% and 41%, respectively. The power conversion efficiency (?) values were obtained as 2.02% and 2.11% for pure PbS and PbS:Mo(3%) thin films, respectively. Thus, it was observed that the doped metal has significantly improved the photovoltaic properties of PbS thin films.Öğe SYNTHESIS ZTO NANOPARTICLES AND STUDY OF THEIR PHOTOCATALYTIC PROPERTIES(Journal of Ovonic Research, 2019-03-25) BULUT, Nesrin; BAYTAR, Orhan; ŞAHİN, Ömer; HOROZ, SabitNanosized zinc tin oxide (ZTO, Zn2SnO4) photocatalysts were prepared with a hydrothermal technique and their structural and optical properties were characterized by performing powder x-ray diffraction (XRD), ultraviolet-visible (UV-Vis) and photoluminescence (PL) spectroscopies, respectively. The XRD results indicated that the ZTO nanoparticles have a face-centered cubic spinel structure and the average crystallite size was calculated as 18.75 nm by using the Debye–Scherrer equation. The band gap of ZTO nanoparticles was determined as 3.87 eV which is higher than that of bulk ZTO (3.6 eV). The effect of some parameters (amount of dye, amount of catalyst and temperature) were studied on the photocatalytic activity of ZTO nanoparticles. The obtained all results revealed that ZTO nanoparticles can be used as promising photocatalysts for degradation methyl-blue (MB) (dye). Moreover, it was determined that photocatalytic degradation kinetics of dye at all temperatures are better matched to the first order kinetic model.
