Yazar "Eren, Tanju" seçeneğine göre listele

Listeleniyor 1 - 20 / 33
  • [ X ]
    Öğe
    3D Polyoxometalate-Functionalized Graphene Quantum Dots with Mono-Metallic and Bi-Metallic Nanoparticles for Application in Direct Methanol Fuel Cells
    (Electrochemical Soc Inc, 2016) Colak, Alper Tolga; Eren, Tanju; Yola, Mehmet Lutfi; Besli, Erdem; Sahin, Onur; Atar, Necip
    A fuel cell is an electrochemical cell that converts a source fuel into an electrical current. It generates electricity inside a cell through reactions between a fuel and an oxidant, triggered in the presence of an electrolyte. Fuel cells have been attracting more and more attention in recent decades due to high-energy demands, fossil fuel depletions, and environmental pollution throughoutworld. Afacile and cost-effective catalysts have been developed on polyoxometalate (NaPWO) functionalized graphene quantum dots (GQDs) with several mono-metallic and bi-metallic nanoparticles such as platinum nanoparticles (PtNPs), palladium nanoparticles (PdNPs) and platinum-palladium nanoparticles (Pt-PdNPs). The successful synthesis of nanomaterials and the prepared glassy carbon electrode (GCE) surfaces were confirmed by transmission electron microscope (TEM), X-ray photo electron spectroscopy (XPS), scanning electron microscope (SEM), electrochemical impedance spectroscopy (EIS) and X-ray diffraction (XRD) method. According to TEM images, the average particle sizes of PtNPs and PdNPs were found to be approximately 20-30 nm. The Pt-PdNPs/NaPWO/GQDs also exhibited a higher peak current for methanol oxidation than those of comparable PdNPs/NaPWO/GQDs and PtNPs/NaPWO/GQDs, thus providing evidence for its higher electro-catalytic activity. (C) 2016 The Electrochemical Society. All rights reserved.
  • [ X ]
    Öğe
    A molecular imprinted SPR biosensor for sensitive determination of citrinin in red yeast rice
    (Elsevier Sci Ltd, 2015) Atar, Necip; Eren, Tanju; Yola, Mehmet Lutfi
    A novel and sensitive molecular imprinted surface plasmon resonance (SPR) biosensor was developed for selective determination of citrinin (CIT) in red yeast rice. Firstly, the gold surface of SPR chip was modified with allyl mercaptane. Then, CIT-imprinted poly(2-hydroxyethyl methacrylate-methacryloylamidoglutamic acid) (p(HEMA-MAGA)) film was generated on the gold surface modified with allyl mercaptane. The unmodified and imprinted surfaces were characterized by Fourier transform infrared (FTIR) spectroscopy, atomic force microscopy (AFM) and contact angle measurements. The linearity range and the detection limit were obtained as 0.005-1.0 ng/mL and 0.0017 ng/mL, respectively. The SPR biosensor was applied to determination of CIT in red yeast rice sample. (C) 2015 Elsevier Ltd. All rights reserved.
  • [ X ]
    Öğe
    A Molecular Imprinted Voltammetric Sensor Based on Carbon Nitride Nanotubes: Application to Determination of Melamine
    (Electrochemical Soc Inc, 2016) Yola, Mehmet Lutfi; Eren, Tanju; Atar, Necip
    Melamine (MEL) has high nitrogen rich content. Because of this situation, it has been illegally added to dairy products by producers to obtain a higher readout of apparent protein content. This has been a cause of serious diseases and many infants have been intoxicated because the addition of MEL into food products can cause death. In this report, a novel molecular imprinted voltammetric sensor based on carbon nitride nanotubes (C3N4 NTs) modified glassy carbon electrode (GCE) was presented for determination of MEL. The developed surfaces were characterized using scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS). MEL imprinted GCE was prepared via electropolymerization process of 100 mM phenol as monomer in the presence of phosphate buffer solution (PBS) (pH 7.0) containing 25 nM MEL. The linearity range and the detection limit of the method were calculated as 1.0 x 10(-1)0 -5.0 x 10(-9) M and 1.0 x 10(-11) M, respectively. The voltammetric sensor was applied to milk samples with good selectivity and recovery. The stability and reproducibility of the voltammetric sensor were also reported. (C) 2016 The Electrochemical Society.
  • [ X ]
    Öğe
    A novel and sensitive electrochemical DNA biosensor based on Fe@Au nanoparticles decorated graphene oxide
    (Pergamon-Elsevier Science Ltd, 2014) Yola, Mehmet Lutfi; Eren, Tanju; Atar, Necip
    A novel and sensitive electrochemical biosensor for selective determination of DNA was developed based on Fe@Au nanoparticles (Fe@AuNPs) involving 2-aminoethanethiol (AET) functionalized graphene oxide (GO) (Fe@AuNPs-AETGO). Firstly, 5 '-TA CCG GGT GCT CGA GCC-(CH2)(3)-SH-3 ' single-stranded probe (ss-DNA) was immobilized on Fe@AuNPs-AETGO nanocomposite to form ssDNA-Fe@AuNPs-AETGO. Square wave voltammetry (SWV) was applied to monitor the DNA hybridization by basic blue 41 (BB41) as an electrochemical indicator. The DNA immobilization and hybridization on the film were studied by cyclic voltammetry (CV), SWV and electrochemical impedance spectroscopy (EIS). Under optimum conditions, the peak currents of BB41 were linear with the logarithm of the concentrations of complementary DNA (5 '-AT GGC CCA CGA GCT CGA-(CH2)(3)-SH-3) from 1.0 x 10(-14) to 1.0 x 10(-8) M with a detection limit of 2.0 x 10(-15) M. The biosensor also showed high selectivity to one-base, two-base and three-base mismatched DNA. Compared with the other electrochemical DNA biosensors, the proposed biosensor showed its own performance of simplicity, good stability and high sensitivity. (C) 2014 Elsevier Ltd. All rights reserved.
  • [ X ]
    Öğe
    A novel determination of curcumin via Ru@Au nanoparticle decorated nitrogen and sulfur-functionalized reduced graphene oxide nanomaterials
    (Royal Soc Chemistry, 2016) Kotan, Gul; Kardas, Faruk; Yokus, Ozlem Aktas; Akyildirim, Onur; Saral, Hasan; Eren, Tanju; Yola, Mehmet Lutfi
    We report the synthesis of Ru@Au nanoparticle involved L-cysteine functionalized reduced graphene oxide (rGO) composites (NSrGO/Ru@AuNPs). The nanocomposites were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). The electrochemical determination of curcumin (CR) has been studied using square wave voltammetry (SWV) on a glassy carbon electrode (GCE) modified with NSrGO/Ru@AuNP composites (NSrGO/Ru@AuNPs/GCE). The effective surface areas (ESAs) of the rGO/GCE and NSrGO/Ru@AuNPs/GCE were calculated to be 347 cm(2) mg(-1) and 1289 cm(2) mg(-1), respectively. These results show that the electrochemical surface area of the NSrGO/Ru@AuNPs/GCE is 3.71 times higher than that of the rGO/GCE. The developed method was also applied successfully for the determination of CR in plasma and the linearity range of CR was 0.001-0.1 nM with a detection limit of 2.0 x 10(-13) M.
  • [ X ]
    Öğe
    A novel efficient photocatalyst based on TiO2 nanoparticles involved boron enrichment waste for photocatalytic degradation of atrazine
    (Elsevier Science Sa, 2014) Yola, Mehmet Lutfi; Eren, Tanju; Atar, Necip
    In this study, a novel photocatalyst based on TiO2 nanoparticles was synthesized by using a waste material (BEW) without any reducing agent and the photocatalyst (TiO2-BEW) was used for investigating photodegradation of atrazine. The transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction patterns (XRD) showed the formation of TiO2 nanoparticles on BEW. The BET surface area increased after intercalation of TiO2 nanoparticles into BEW. In photocatalytic degradation studies, the effect of operating variables such as initial atrazine concentration, catalyst dosage and contact time was also investigated. The photocatalysis kinetic studies showed that the removal of atrazine followed a pseudo-first-order reaction kinetic. The photocatalyst was synthesized as a simple, fast, clean, highly efficient and eco-friendly. The photocatalysis experiments show that TiO2-BEW can be used as novel photocatalyst in terms of stable, good efficiency, good reusability and lower cost. The photodegradation of atrazine by using TiO2-BEW is demonstrated as a more effective technique for the pesticide removal from aqueous solution. (C) 2014 Elsevier B.V. All rights reserved.
  • [ X ]
    Öğe
    A novel electro analytical nanosensor based on graphene oxide/silver nanoparticles for simultaneous determination of quercetin and morin
    (Pergamon-Elsevier Science Ltd, 2014) Yola, Mehmet Lutfi; Gupta, Vinod Kumar; Eren, Tanju; Sen, Arif Emre; Atar, Necip
    In this report, silver nanoparticles (AgNPs) with the mean diameters of 10-30 nm were self-assembled onto the surfaces of 2-aminoethanethiol (2-AET) functionalized graphene oxide (AETGO) sheets. The graphene oxide (GO) and AgNPs-AETGO nanocomposites were characterized by a transmission electron microscope (TEM), x-ray photoelectron spectroscopy (XPS), reflection absorption infrared spectroscopy (RAIRS) and the x-ray diffraction (XRD). The simultaneous determination of quercetin (QR) and morin (MR) has been performed on glassy carbon electrode (GCE) modified with AgNPs-AETGO (AgNPs-AETGO/GCE). QR presented an oxidation step at Ea of 200 mV and reduction step at Ec of 150 mV and RT presented an oxidation step at Ea of 600 mV at AgNPs-AETGO/GCE by cyclic voltammetry (CV). The linearity ranges and the detection limits of QR and MR were 1.0 x 10-8 - 5.0 x 10-6 M and 3.3 x 10-9 M, respectively. The AgNPs-AETGO/GCE was also applied to real samples for the simultaneous determination of QR and MR. Thus the developed method can be adopted as an alternative to the published chromatographic, spectrophotometric and electroanalytical methods for simultaneous determination of QR and MR. (C) 2013 Elsevier Ltd. All rights reserved.
  • [ X ]
    Öğe
    A sensitive molecular imprinted electrochemical sensor based on gold nanoparticles decorated graphene oxide: Application to selective determination of tyrosine in milk
    (Elsevier Science Sa, 2015) Yola, Mehmet Lutfi; Eren, Tanju; Atar, Necip
    In present study, a sensitive imprinted electrochemical sensor based on cubic gold nanoparticles (cAuNPs) involved in 2-aminoethanethiol (2-AET) functionalized graphene oxide (GO) modified glassy carbon(GC) electrode was developed for determination of tyrosine (Tyr). The prepared nanomaterials were characterized by using scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS) and reflection-absorption infrared spectroscopy (RAIRS). Tyr imprinted film was constructed by cyclic voltammetry (CV) for 20 cycles in the presence of 80 mM phenol in phosphate buffer solution (pH 7.0) containing 20 mM Tyr. The imprinted electrochemical sensor was validated according to the ICH guideline and found to be linear, sensitive, precise and accurate. The linearity range and the detection limit were obtained as 1.0 x 10(-9) to 2.0 x 10(-8) M and 1.5 x 10(-10) M, respectively. The developed imprinted sensor was successfully applied to milk samples. In addition, the stability and reproducibility of the prepared molecular imprinted electrode were investigated. The excellent long-term stability and reproducibility of the prepared Tyr imprinted electrodes make them attractive in electrochemical sensors. (C) 2014 Elsevier B.V. All rights reserved.
  • [ X ]
    Öğe
    A sensitive molecular imprinted surface plasmon resonance nanosensor for selective determination of trace triclosan in wastewater
    (Elsevier Science Sa, 2015) Atar, Necip; Eren, Tanju; Yola, Mehmet Lutfi; Wang, Shaobin
    Triclosan (TCS) has been widely used as an antibacterial and antifungal agent in household cleaning and personal care products. The widespread use of TCS in the cleaning products poses a potential risk to the ecological system and human health due to its release into sediments, wastewater and ground water resources causing chronicle toxicity to aquatic organisms. However, no simple method is available for its detection and quantitative determination in aqueous solution. A novel molecular imprinted surface plasmon resonance (SPR) chemical sensor was developed for sensitive and selective detection of triclosan (TCS) in wastewater, using allylmercaptane modified gold SPR chip and imprinted poly( 2-hydroxyethyl methacrylate-methacryloylamidoglutamic acid) [p(HEMAGA)] nanofilm. The unmodified and imprinted surfaces of the SPR chip were characterized by Fourier transform infrared (FTIR) spectroscopy, atomic force microscopy (AFM) and contact angle measurements. The developed sensor was validated according to the ICH guideline (International Conference on Harmonisation). The linearity range and detection limit of TCS were obtained as 0.05-1.0 ng/mL and 0.017 ng/mL, respectively. The developed molecular imprinted nanosensor was successfully applied to wastewater samples for the determination of TCS and exhibited excellent performance. (C) 2015 Elsevier By. All rights reserved.
  • [ X ]
    Öğe
    A sensitive molecularly imprinted polymer based quartz crystal microbalance nanosensor for selective determination of lovastatin in red yeast rice
    (Elsevier Sci Ltd, 2015) Eren, Tanju; Atar, Necip; Yola, Mehmet Lutfi; Karimi-Maleh, Hassan
    Lovastatin (LOV) is a statin, used to lower cholesterol which has been found as a hypolipidemic agent in commercial red yeast rice. In present study, a sensitive molecular imprinted quartz crystal microbalance (QCM) sensor was prepared by fabricating a self-assembling monolayer formation of allylmercaptane on QCM chip surface for selective determination of lovastatin (LOV) in red yeast rice. To prepare molecular imprinted quartz crystal microbalance (QCM) nanosensor, LOV imprinted poly(2-hydroxyethyl methacrylate-methacryloylamidoaspartic acid) [p(HEMA-MAAsp)] nanofilm was attached on the modified gold surface of QCM chip. The non-modified and improved surfaces were characterized by using contact angle, atomic force microscopy (AFM) and Fourier transform infrared (FTIR) spectroscopy. The imprinted QCM sensor was validated according to the ICH guideline (International Conference on Harmonisation). The linearity range was obtained as 0.10-1.25 nM. The detection limit of the prepared material was calculated as 0.030 nM. The developed QCM nanosensor was successfully used to examine red yeast rice. Furthermore, the stability and repeatability of the prepared QCM nanosensor were studied. The spectacular long-term stability and repeatability of the prepared LOV-imprinted QCM nanosensor make them intriguing for use in QCM sensors. (C) 2015 Elsevier Ltd. All rights reserved.
  • [ X ]
    Öğe
    A sensitive voltammetric sensor for determination of Cd(II) in human plasma
    (Elsevier, 2014) Yola, Mehmet Lutfi; Eren, Tanju; Ilkimen, Halil; Atar, Necip; Yenikaya, Cengiz
    The development of electrochemical sensors via surface modification has attracted considerable attention as a low-cost method to the sensitive detection of a variety of analytes. In addition, the surface modification of electrodes has been directed toward several goals, often involving electrode kinetics and chemical selectivity. In this study, we performed the electrochemical modification of glassy carbon (GC) electrode with 2-thiolbenzimidazole (2-TBI). The developed electrode was characterized by the reflection-absorption infrared spectroscopy (RAIRS), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). According to the RAIRS results, the binding type of the 2-TBI to glassy carbon electrode was through the etheric linkage. The working range of the developed electrode was also studied. In addition, the developed electrode was applied to human plasma samples for the determination of Cd(II). The linearity range of Cd(II) was obtained as 1.0 x 10(-11)-2.5 x 10(-10) M with the detection limit (S/N = 3) of 2.40 x 10(-12) M. (C) 2014 Elsevier B.V. All rights reserved.
  • [ X ]
    Öğe
    Adsorptive and photocatalytic removal of reactive dyes by silver nanoparticle-colemanite ore waste
    (Elsevier Science Sa, 2014) Yola, Mehmet Lutfi; Eren, Tanju; Atar, Necip; Wang, Shaobin
    A novel composite containing silver nanoparticles (AgNPs) and colemanite ore waste (COW) was synthesized and tested in adsorption and photocatalysis to remove Reactive Yellow 86 (RY86) and Reactive Red 2 (RR2) from aqueous solution in single and binary dye systems. Transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction patterns (XRD) showed the formation of metal AgNPs on COW. The BET surface area increased after intercalation of AgNPs onto COW. Ag-COW was found to be a good material for dye adsorption. The effects of operating variables such as initial dye concentration, pH and contact time in adsorption were studied. The kinetics, isotherm and thermodynamic parameters for the adsorptive removal of the reactive dyes were also investigated. In addition, Ag-COW also shows high photocatalytic activity for degradation of the reactive dyes from single and binary dye solutions. The combination of adsorption and photocatalysis using Ag-COW is demonstrated as a more effective technique for contaminant removal from aqueous solution. (C) 2014 Elsevier B.V. All rights reserved.
  • [ X ]
    Öğe
    Catalytic activity of Fe@Ag nanoParticle involved calcium alginate beads for the reduction of nitroPhenols
    (Elsevier, 2014) Gupta, Vinod Kumar; Yola, Mehmet Lutfi; Eren, Tanju; Kartal, Fatma; Caglayan, Mustafa Oguzhan; Atar, Necip
    A novel highly efficient and recyclable catalyst based on Fe@Ag bimetallic nanoParticles involved parninothiophenol (ATP) functionalized calcium alginate (Fe@Ag-ATP-CA) beads was prepared and characterized by transmission electron microscope (TEM), and x-ray photoelectron spectroscopy (XPS). The catalytic properties of 4-nitrophenol (4-NP) and 2-nitrophenol (2-NP) were performed using Fe@Ag-ATP-CA catalyst synthesized in the presence of sodium borohydride (NaBH4). The effects of various variables such as the catalyst dosage, the concentration of sodium borohydride, and temperature were also investigated. The rates of catalytic reduction of 4-NP and 2-NP compounds have been found as the sequence: 4-NP > 2-NP. The kinetic models and the thermodynamic parameters were studied to show the reduction mechanisms. The Fe@Ag-ATP-CA catalyst has highly efficient recyclability and excellent catalytic activity. (C) 2013 Elsevier B.V. All rights reserved.
  • [ X ]
    Öğe
    CoFe2O4@TiO2 decorated reduced graphene oxide nanocomposite for photocatalytic degradation of chlorpyrifos
    (Elsevier, 2015) Gupta, Vinod Kumar; Eren, Tanju; Atar, Necip; Yola, Mehmet Lutfi; Parlak, Cemal; Karimi-Maleh, Hassan
    Chlorpyrifos is widely used to control pest insects in residential, agricultural, and commercial applications. Its common use has led to the release of chlorpyrifos into sediments, wastewater and water sources. The presence of chlorpyrifos in wastewaters and water sources may affect ecosystem and human health due to its chronicle toxicity to aquatic organisms. In this study, magnetic recoverable CoFe2O4@TiO2 decorated reduced graphene oxide nanocomposite was prepared and used for investigating the photodegradation of chlorpyrifos. The nanocomposite was characterized by using transmission electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction and scanning electron microscopy. In photocatalytic degradation of chlorpyrifos experiments, the effect of operating variables such as initial chlorpyrifos concentration, catalyst dosage and contact time was also investigated. The photocatalytic degradation of chlorpyrifos followed the pseudo-first-order kinetic model. The results indicated that the nanocomposite exhibited a high efficient photocatalytic activity on the photodegradation of chlorpyrifos. The nanocomposite was separated from the solution by a magnet and reused after the photodegradation of chlorpyrifos. The recyclable of the nanocomposite is economically significant in the industry. (C) 2015 Elsevier B.V. All rights reserved.
  • [ X ]
    Öğe
    Determination of amikacin in human plasma by molecular imprinted SPR nanosensor
    (Elsevier Science Sa, 2014) Yola, Mehmet Lutfi; Atar, Necip; Eren, Tanju
    molecular imprinting technique depends on the molecular recognition. It is polymerization method occuring around the target molecule. Thus this technique creates specific cavities in the cross-linked polymeric matrices. Amikacin (AMIK) is an important aminoglycoside (AG) antibiotic used to treat different types of bacterial infections. In this study, we prepared surface plasmon resonance (SPR) sensor for the determination of AMIK in human plasma. After the modification of gold surface of SPR chip was performed by allyl mercaptane, AMIK-imprinted poly(2-hydroxyethyl methacrylate-methacryloylamidoasparticacid) [p(HEMA-MAAsp)] film was generated on the allyl mercaptane modified gold surface. The non-modified and imprinted surfaces were characterized by Fourier transform infrared (FTIR) spectroscopy, atomic force microscopy (AFM) and contact angle measurements. The developed method was validated according to the ICH guideline. The linearity range and the detection limit were obtained as 0.01-0.15 mu g/mL and 0.0025 mu g/mL (4.3 Chi 10(-9) mol/L), respectively. The developed AMIK-imprinted nanosensor was successfully applied to the human plasma samples for the determination of AMIK. (C) 2014 Elsevier B.V. All rights reserved.
  • [ X ]
    Öğe
    Direct-methanol Fuel Cell Based on Functionalized Graphene Oxide with Mono-metallic and Bi-metallic Nanoparticles: Electrochemical Performances of Nanomaterials for Methanol Oxidation
    (Wiley-V C H Verlag Gmbh, 2016) Yola, Mehmet Lutfi; Eren, Tanju; Atar, Necip; Saral, Hasan; Ermis, Ismail
    The catalysts based on 2-aminoethanethiol functionalized graphene oxide (AETGO) with several mono-metallic and bi-metallic nanoparticles such as rod gold (rAuNPs), rod silver (rAgNPs), rod gold-platinum (rAu-Pt NPs) and rod silver-platinum (rAg-Pt NPs) were synthesized. The successful synthesis of nanomaterials was confirmed by various methods. The effective surface area (ESA) of the rAu-Pt NPs/AETGO is 1.44, 1.64 and 2.40 times higher than those of rAg-Pt NPs/AETGO, rAuNPs/AETGO and rAgNPs/AETGO, respectively, under the same amount of Pt. The rAu-Pt NPs/AETGO exhibited a higher peak current for methanol oxidation than those of comparable rAg-Pt NPs/AETGO under the same amount of Pt loading.
  • [ X ]
    Öğe
    Fabrication of bimetallic Pt/Pd nanoparticles on 2-thiolbenzimidazole functionalized reduced graphene oxide for methanol oxidation
    (Springer Heidelberg, 2016) Akyildirim, Onur; Kotan, Gul; Yola, Mehmet Lutfi; Eren, Tanju; Atar, Necip
    In this study, an electrocatalyst based on 2-thiolbenzimidazole (TBI) functionalized reduced graphene oxide (rGO) with platinum and palladium nanoparticles (Pt-PdNPs) was synthesized. The successful synthesis of nanomaterials and the prepared glassy carbon electrode (GCE) surfaces were confirmed by transmission electron microscope, X-ray photo electron spectroscopy, scanning electron microscope, electrochemical impedance spectroscopy and X-ray diffraction method. The effective surface areas of TBIrGO/GCE, PdNPs/TBIrGO/GCE, PtNPs/TBIrGO/GCE and Pt-PdNPs/TBIrGO/GCE were calculated to be 324, 578, 667 and 1189 cm(2)/mg, respectively. According to the results, the electrochemical surface area of the Pt-PdNPs/TBIrGO is 3.67, 2.06 and 1.78 times higher than those of TBIrGO, PdNPs/TBIrGO and PtNPs/TBIrGO, respectively. The Pt-PdNPs/TBIrGO/GCE also exhibited higher peak current for methanol oxidation than those of comparable TBIrGO/GCE, PdNPs/TBIrGO/GCE, PtNPs/TBIrGO/GCE modified GCEs, thus providing evidence for its higher electro-catalytic activity.
  • [ X ]
    Öğe
    Facile and green fabrication of silver nanoparticles on a polyoxometalate for Li-ion battery
    (Springer Heidelberg, 2015) Eren, Tanju; Atar, Necip; Yola, Mehmet Lutfi; Karimi-Maleh, Hassan; Colak, Alper Tolga; Olgun, Asim
    In the present study, we report the green and one-pot synthesis of silver nanoparticles (AgNPs) on as-prepared novel polyoxometalate {[Ni-2,Ni-5(Hpen)(4)(PW9O34)] center dot 5H(2)O} (POM) without any reducing agent and its application as improved anode material for lithium-ion batteries (LIBs). The structure of the AgNPs involved POM (AgNPs/POM) nanocomposite was characterized by transmission electron microscopy, scanning electron microscopy, and X-ray photoelectron spectroscopy. The synthesized POM was also characterized by elemental analysis and thermal analysis. The electrochemical performances of the POM, AgNPs, and AgNPs/POM composites were measured for charge/discharge specific capacities at different current rates in CR2032 coin-type cells. The prepared AgNPs/POM composite showed a high specific gravimetric capacity of about 1760 mAh g(-1) and long-term cycle stability.
  • [ X ]
    Öğe
    Fe@Ag nanoparticles decorated reduced graphene oxide as ultrahigh capacity anode material for lithium-ion battery
    (Springer Heidelberg, 2015) Atar, Necip; Eren, Tanju; Yola, Mehmet Lutfi; Gerengi, Husnu; Wang, Shaobin
    In the present study, we report the synthesis of Fe@Ag nanoparticles/2-aminoethanethiol functionalized reduced graphene oxide (rGO) composite (Fe@AuNPs-AETrGO) and its application as an improved anode material for lithium-ion batteries (LIBs). The structure of the Fe@AgNPs-AETrGO composite was characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). The electrochemical performance was investigated at different charge/discharge current rates by using CR2032 coin-type cells and cyclic voltammetry (CV). It was found that the spherical Fe@AuNPs were highly dispersed on the rGO sheets. Moreover, the Fe@AuNPs-AETrGO composite showed high specific gravimetric capacity of about 1500 mAh g(-1) and long-term cycle stability.
  • [ X ]
    Öğe
    Highly Selective and Sensitive Voltammetric Sensor Based on Ruthenium Nanoparticle Anchored Calix[4]amidocrown-5 Functionalized Reduced Graphene Oxide: Simultaneous Determination of Quercetin, Morin and Rutin in Grape Wine
    (Wiley-V C H Verlag Gmbh, 2016) Elcin, Serkan; Yola, Mehmet Lutfi; Eren, Tanju; Girgin, Burcu; Atar, Necip
    In this report, ruthenium nanoparticles (RuNPs) and calix[4]amidocrown-5 (C4A5) were synthesized and grafted onto the surface of reduced graphene oxide (RGO) nanocomposite (RuNPs/C4A5/RGO). The morphologies of the nanocomposites were characterized by transmission electron microscope, scanning electron microscope, atomic force microscope, electrochemical impedance spectroscopy and x-ray photoelectron spectroscopy. The electrochemical experiments were performed by cyclic voltammetry, electrochemical impedance spectroscopy and square wave voltammetry. The simultaneous determination of quercetin, rutin and morin was performed on glassy carbon electrode modified with RuNPs/C4A5/RGO (RuNPs/C4A5/RGO/GCE). The linearity ranges and the detection limits of QR, RT and MR were 1.0x10(-10)-1.0x10(-8)M and 2.0x10(-11)M respectively.