Yazar "Gupta, Vinod Kumar" seçeneğine göre listele

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    A Novel DNA Biosensor Based on a Pencil Graphite Electrode Modified with Polypyrrole/Functionalized Multiwalled Carbon Nanotubes for Determination of 6-Mercaptopurine Anticancer Drug
    (Amer Chemical Soc, 2015) Karimi-Maleh, Hassan; Tahernejad-Javazmi, Fahimeh; Atar, Necip; Lutfi, Mehmet; Gupta, Vinod Kumar; Ensafi, Ali A.
    A novel and sensitive biosensor employing immobilized DNA on a pencil graphite electrode modified with polypyrrole/functionalized multiwalled carbon nanotubes for the determination of 6-mercaptopurine (6-MP) is presented. In the first step, we modified the pencil graphite surface with polypyrrole and functionalized multiwalled carbon nanotubes (MWCNT/COOH). The developed electrode was characterized by scanning electron microscopy, atomic force microscopy, reflectionabsorption infrared spectroscopy, X-ray photoelectron spectroscopy, and electrochemical impedance spectroscopy. In the other step, we used decreases in the oxidation responses of guanine and adenine as a sign of the interaction of 6-MP with salmon sperm double-stranded DNA using differential pulse voltammetry. The signal of guanine oxidation was linear with respect to the 6-MP concentration in the range of 0.2-100 mu mol L-1 with a detection limit of 0.08 mu mol L-1. The modified electrode was utilized for the determination of 6-MP in real samples.
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    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.
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    A novel glucose biosensor platform based on Ag@AuNPs modified graphene oxide nanocomposite and SERS application
    (Academic Press Inc Elsevier Science, 2013) Gupta, Vinod Kumar; Atar, Necip; Yola, Mehmet Lutfi; Eryilmaz, Merve; Torul, Hilal; Tamer, Ugur; Boyaci, Ismail Hakki
    This study represents a novel template demonstration of a glucose biosensor based on mercaptophenyl boronic acid (MBA) terminated Ag@AuNPs/graphene oxide (Ag@AuNPs-GO) nanomaterials. The nanocomposites were characterized by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD) method. The TEM image shows that Ag@AuNPs in the nanocomposite is in the range of diameters of 10-20 nm. The nanocomposite was used for the determination of glucose through the complexation between boronic acid and diol groups of glucose. Thus, a novel glucose biosensor was further fabricated by immobilizing glucose oxidase (GOD) into MBA terminated Ag@AuNPs-GO nanocomposite film (MBA-Ag@AuNPs-GO). The linearity range of glucose was obtained as 2-6 mM with detection limit of 0.33 mM. The developed biosensor was also applied successfully for the determination of glucose in blood samples. The concentration value of glucose in blood samples was calculated to be 1.97 +/- 0.002 mM from measurements repeated for six times. (C) 2013 Elsevier Inc. All rights reserved.
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    A novel impedimetric biosensor based on graphene oxide/gold nanoplatform for detection of DNA arrays
    (Elsevier Science Sa, 2013) Gupta, Vinod Kumar; Yola, Mehmet Lutfi; Qureshi, Munewar Saeed; Solak, Ali Osman; Atar, Necip; Ustundag, Zafer
    A highly sensitive method for detection of DNA hybridization was developed. This method was based on the modification of glassy carbon electrode with gold nanoparticles (AuNPs) involving p-aminothiophenol (ATP) functionalized graphene oxide (GO). This GO was used as a platform for impedimetric genosensing using 5'-TA GGG CCA CTT GGA CCT-(CH2)(3)-SH-3' single-stranded probe (ss-DNA), 5'-AGG TCC AAG TGG CCC TA-3'(target DNA), 5'-SH-C-6-TAG GGC CA-3'(non-complementary-1) and 5'-SH-C-6-TGC CCG TTA CG 3-' (non-complementary-2) oligonucleotide sequences. The film exhibited excellent properties for immobilizing DNA probes and sensing DNA hybridization. The DNA immobilization and hybridization on the film were studied by cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS), and found that the charge transfer resistance (R-ct) of the electrode increased with the concentration of the target DNA hybridized with the ss-DNA. The linear detectionrange was from 1.0 x 10(-13) M to 1.0 x 10(-7) M and the detection limit was 1.10 x 10(-14) M (n = 6). Compared with the other electrochemical DNA biosensors, the proposed biosensor showed its own performance of simplicity, good stability, and high sensitivity. (C) 2013 Elsevier B. V. All rights reserved.
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    A novel magnetic Fe@Au core-shell nanoparticles anchored graphene oxide recyclable nanocatalyst for the reduction of nitrophenol compounds
    (Pergamon-Elsevier Science Ltd, 2014) Gupta, Vinod Kumar; Atar, Necip; Yola, Mehmet Lutfi; Ustundag, Zafer; Uzun, Lokman
    In this study, a novel catalyst based on Fe@Au bimetallic nanoparticles involved graphene oxide was prepared and characterized by transmission electron microscope (TEM), and x-ray photoelectron spectroscopy (XPS). The nanomaterial was used in catalytic reductions of 4-nitrophenol and 2-nitrophenol in the presence of sodium borohydride. The experimental parameters such as temperature, the dosage of catalyst and the concentration of sodium borohydride were studied. The rates of catalytic reduction of the nitrophenol compounds have been found as the sequence: 4-nitrophenol>2-nitrophenol. The kinetic and thermodynamic parameters of nitrophenol compounds were determined. Activation energies were found as 2.33 kcal mol(-1) and 3.16 kcal mol(-1) for 4-nitrophenol and 2-nitrophenol, respectively. The nanomaterial was separated from the product by using a magnet and recycled after the reduction of nitrophenol compounds. The recyclable of the nanocatalyst is economically significant in industry. (C) 2013 Elsevier Ltd. All rights reserved.
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    A novel molecular imprinted nanosensor based quartz crystal microbalance for determination of kaempferol
    (Elsevier Science Sa, 2014) Gupta, Vinod Kumar; Yola, Mehmet Lutfi; Atar, Necip
    The molecular imprinting technique relies on the molecular recognition. It is a kind of polymerization which is formed around the target molecule. Hence this technique forms specific cavities in the cross-linked polymeric matrices. In this report, we developed quartz crystal microbalance (QCM) nanosensor for the real-time detection of kaempferol (KAE). Firstly, the modification of gold surface of QCM chip was carried out by self-assembling monolayer formation of allyl mercaptane to introduce polymerizable double bonds on the chip surface. Then, KAE imprinted poly(2-hydroxyethyl methacrylate-methacryloylamidoaspartic acid) [p(HEMA-MAAsp)] film was generated on the gold surface. The non-modified and KAE-imprinted p(HEMA-MAAsp) surfaces were characterized by using atomic force microscopy (AFM), Fourier transform infrared (FTIR) spectroscopy and ellipsometry. The linearity range and the detection limit were obtained as 2.0 x 10(-10) to 1.5 x 10(-9) M and 6.0 x 10(-11) M, respectively. The developed method was applied to real samples such as orange and apple juices for the determination of KAE in the presence of quercetin (QR), myricetin (MYR) and apigenin (API). In addition, isotherm models were applied to data to explain adsorption process. (C) 2013 Elsevier B. V. All rights reserved.
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    A novel sensitive Cu(II) and Cd(II) nanosensor platform: Graphene oxide terminated p-aminophenyl modified glassy carbon surface
    (Pergamon-Elsevier Science Ltd, 2013) Gupta, Vinod Kumar; Yola, Mehmet Lutfi; Atar, Necip; Ustundag, Zafer; Solak, Ali Osman
    Graphene oxide (GO) based glassy carbon (GC) electrode has been prepared. Firstly, p-nitrophenyl (NP) modified GC (NP/GC) electrode was prepared via the electrochemical reduction of its tetraflouroborate diazonium salt. After the formation of NP/GC electrode, the negative potential was applied to NP/GC electrode to reduce the nitro groups to amine. p-Aminophenyl (AP) modified GC (AP/GC) electrode was immersed into a graphene oxide solution containing 1-ethyl-3(3-(dimethlyamino)propyl)-carbodiimide. Hence, we constructed GO terminated AP modified GC (GO/AP/GC) electrode. NP/GC, AP/GC and GO/AP/GC electrodes were characterized sequentially using cyclic voltammetry (CV) in the presence of 1.0 mM of potassium ferricyanide in 0.1 M KCl. In addition, GO and GO/AP/GC surfaces were characterized by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). The GO/AP/GC electrode was used for the analysis of Cd(II) and Cu(II) ions by adsorptive stripping voltammetry. The linearity range and the detection limit of Cd(II) and Cu(II) ions were 1.0 x 10(-11)-5.0 x 10(-10) M and 3.3 x 10(-12) M (SIN=3), respectively. (C) 2013 Elsevier Ltd. All rights reserved.
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    Adsorptive properties of molasses modified boron enrichment waste based nanoclay for removal of basic dyes
    (Elsevier Science Inc, 2016) Gupta, Vinod Kumar; Agarwal, Shilpi; Olgun, Asim; Demir, Halil Ibrahim; Yola, Mehmet Lutfi; Atar, Necip
    In this study, the removal of cationic dyes, Basic Red 46 (BR46) and Basic Blue 41 (BB41), from aqueous solution using boron enrichment waste (BW) and molasses modified boron enrichment waste (MBW) based nanoclays was presented in a batch system and fixed-bed column system. The effects of pH, contact time, initial solution concentration, adsorbent dosage, temperature of batch operation on the uptake of both dyes were investigated. The adsorption data were further performed on the basis of kinetic and isotherm models. According to the results, the dye removal capacity of MBW was higher than that of BW. The studies demonstrated that the adsorption patterns occurred according to Langmuir isotherm model and pseudo-second-order kinetic model. The adsorption of two dyes is spontaneous and exothermic in nature. Breakthrough curves obtained from fixed-bed column tests showed that column adsorption capacities provided strong evidence of the potential of the nanoclay for the technological applications of the basic dyes removal from aqueous solutions. (C) 2015 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
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    Biosynthesis of silver nanoparticles using chitosan immobilized Bacillus cereus: Nanocatalytic studies
    (Elsevier, 2013) Gupta, Vinod Kumar; Atar, Necip; Yola, Mehmet Lutfi; Darcan, Cihan; Idil, Onder; Ustundag, Zafer; Suhas
    In this paper, the biosynthesis study of silver nanoparticles (AgNPs) using chitosan immobilized on the Bacillus cereus (Bc-C) was performed via bioreduction without any reducing agent. Transmission electron microscopy (TEM) showed that the AgNPs were formed as uniformly sized and shaped in the range of 10-30 nm. Scanning electron microscopy (SEM), x-ray photoelectron spectroscopy (XPS) and x-ray diffraction patterns (XRD) confirmed the formation of the Bc-C-Ag. XRD diffraction patterns revealed that the Ag+ on the Bc-C was reduced to Ag (0). This situation shows successful AgNPs synthesis using Bc-C In the bioreduction studies, the effects of operating variables such as initial metal concentration, pH and contact time were also investigated. The AgNPs formed on Bc-C (Bc-C-Ag) were used as a bionanocatalyst for the reduction of 4-nitrophenol (4-NP). The kinetic models and the thermodynamic parameters were investigated to reveal the reduction mechanism. (C) 2013 Elsevier B.V. All rights reserved.
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    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.
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    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.
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    Electrochemical studies on graphene oxide-supported metallic and bimetallic nanoparticles for fuel cell applications
    (Elsevier Science Bv, 2014) Gupta, Vinod Kumar; Yola, Mehmet Lutfi; Atar, Necip; Ustundag, Zafer; Solak, Ali Osman
    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 throughout world. In this study, different sized metallic and bimetallic nanoparticles (AuNPs, Fe@AuNPs, Ag@AuNPs) were synthesized on graphene oxide sheets and their electrocatalytic activities for methanol oxidation were investigated. All the catalysts were characterized by transmission electron microscope (TEM) and X-ray photoelectron spectroscopy (XPS). Electrochemical measurements are performed to compare the catalytic efficiencies of methanol oxidation. Experimental results demonstrated that graphene oxide-supported bimetallic nanoparticles enhanced electrochemical efficiency for methanol electro-oxidation with regard to diffusion efficiency, oxidation potential and forward oxidation peak current. Graphene oxide-supported Ag@AuNPs, in comparison to graphene oxide-supported Fe@AuNPs and AuNPs, showed the more efficiency for methanol electro-oxidation. (C) 2013 Elsevier B.V. All rights reserved.
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    Electrochemically modified sulfisoxazole nanofilm on glassy carbon for determination of cadmium(II) in water samples
    (Pergamon-Elsevier Science Ltd, 2013) Gupta, Vinod Kumar; Yola, Mehmet Lutfi; Atar, Necip; Solak, Ali Osman; Uzun, Lokman; Ustundag, Zafer
    Sulfisoxazole (SO) was grafted to glassy carbon electrode (GCE) via the electrochemical oxidation of SO in acetonitrile solution containing 0.1 M tetrabutylammoniumtetra-fluoroborate (TBATFB). The prepared electrode was characterized by using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), reflection-absorption infrared spectroscopy (RAIRS) and X-ray photoelectron spectroscopy (XPS). The ellipsometric thickness of SO nanofilm at the glassy carbon surface was obtained as 14.48 +/- 0.11 nm. The stability of the SO modified GCE was studied. The SO modified GCE was also utilized for the determination of Cd(II) ions in water samples in the presence of Pb(II) and Fe(II) by adsorptive stripping voltammetry. The linearity range and the detection limit of Cd(II) ions were 1.0 x 10(-1) to 5.0 x 10(-8) M and 3.3 x 10(-11) M (S/N = 3), respectively. (C) 2013 Elsevier Ltd. All rights reserved.
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    Fabrication of highly sensitive nitrite electrochemical sensor in foodstuff using nanostructure sensor
    (Esg, 2017) Gupta, Vinod Kumar; Khalilzadeh, Mohammad A.; Rudbaraki, Ali; Agarwal, Shilpi; Yola, Mehmet L.; Atar, Necip
    In this research, we introduced a powerful electrochemical sensor (based carbon paste electrode) for analysis of nitrite in foodstuff, using CdO decorated single wall carbon nanotube incorporated with 1-methyl-3-butylimidazolium bromide (CdO/SWCNTs/1-3-MBIB/CPE). Our results revealed that CdO/SWCNTs/1-3-MBIB/CPE shows excellent electro-catalytic activity towards electro-oxidation of nitrite. The obtained data illustrated an irreversible oxidation peak current at 0.92 V, pointing to the oxidation of nitrite. The CdO/SWCNTs/1-3-MBIB/CPE exhibited a linear response from 0.1 mu M to 900.0 mu M of nitrite with no interfering from other food compounds. The CdO/SWCNTs/1-3-MBIB/CPE has been used for determination of nitrite in real samples.
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    Fabrication of novel electrochemical sensor for determination of vitamin C in the presence of vitamin B9 in food and pharmaceutical samples
    (Elsevier Science Bv, 2016) Khaleghi, Fatemeh; Arab, Zahra; Gupta, Vinod Kumar; Ganjali, M. R.; Norouzi, Parviz; Atar, Necip; Yola, Mehmet L.
    Synthesis and application of NiO-multiwall carbon nanotube nanocomposite (NiO/MWCNTs) and 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim]BF4) in the carbon paste matrix as high sensitive sensors for voltammetric determination of vitamin C have been reported. The oxidation peak potential of vitamin C at the surface of the ([Bmim]BF4) NiO/MWCNT carbon paste electrode (NiO/MWCNTs/([Bmim]BF4/CPE) appeared at 440 mV, which was about 200 mV lower than the oxidation peak potential at the surface of the simple carbon paste electrode under a similar condition. Also, the oxidation peak current was increased for about 3.7 times at the surface of NiO/MWCNTs/([Bmim]BF4/CPE compared to carbon paste electrode. At an Optimum,condition (pH 7.0), the two peaks are separated ca. 0.44 and 0.85 V for vitamin C and vitamin B-9. This point shows that vitamin C can be determined in the presence of vitamin B-9. The linear response range and detection limit were found to be 0.1-1000 mu M and 0.06 mu M, respectively. The proposed sensor was successfully applied, for the determination of vitamin C in food and drug samples. (C) 2016 Elsevier B.V. All rights reserved.
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    Molecular imprinted polypyrrole modified glassy carbon electrode for the determination of tobramycin
    (Pergamon-Elsevier Science Ltd, 2013) Gupta, Vinod Kumar; Yola, Mehmet Lutfi; Ozaltin, Nuran; Atar, Necip; Ustundag, Zafer; Uzun, Lokman
    Over the past two decades, molecular imprinted polymers have attracted a broad interest from scientists in sensor development. In the preparation of molecular imprinted polymers the desired molecule (template) induces the creation of specific recognition sites in the polymer. In this study, the glassy carbon electrode (GCE) based on molecularly imprinted polypyrrole (PPy) was fabricated for the determination of tobramycin (TOB). The developed electrode was prepared by incorporation of a template molecule (TOB) during the electropolymerization of pyrrole on GCE in aqueous solution using cyclic voltammetry (CV) method. The performance of the imprinted and non-imprinted electrodes was evaluated by square wave voltammetry (SWV). The effect of pH, monomer and template concentrations, electropolymerization cycles on the performance of the imprinted and non-imprinted electrodes was investigated and optimized. The non-modified and TOB-imprinted surfaces were characterized by using atomic force microscopy (AFM), Fourier transform infrared spectroscopy (FTIR), electrochemical impedance spectroscopy (EIS) and CV. The linearity range of TOB was 5.0 x 10(-10)-1.0 x 10(-8) M with the detection limit of 1.4 x 10(-10) M. The developed nanosensor was applied successfully for the determination of TOB in egg and milk. (C) 2013 Elsevier Ltd. All rights reserved.
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    New molecular imprinted voltammetric sensor for determination of ochratoxin A
    (Elsevier, 2016) Yola, Mehmet Lutfi; Gupta, Vinod Kumar; Atar, Necip
    In this report, a novel molecular imprinted voltammetric sensor based on silver nanoparticles (AgNPs) involved in a polyoxometalate (H3PW12O40, POM) functionalized reduced graphene oxide (rGO) modified glassy carbon electrode (GCE) was presented for determination of ochrattoxin A (OCH). The developed surfaces were characterized using scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) method. OCH imprinted GCE was prepared via electropolymerization process of 100 mM phenol as monomer in the presence of phosphate buffer solution (pH 6.0) containing 25 mM OCH. The linearity range and the detection limit of the method were calculated as 5.0 x 10(-11) - 1.5 x 10(-9) M and 1.6 x 10(-11) M, respectively. The voltammetric sensor was applied to grape juice and wine samples with good selectivity and recovery. The stability of the voltammetric sensor was also reported. (C) 2015 Elsevier B.V. All rights reserved.
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    Selective QCM sensor based on atrazine imprinted polymer: Its application to wastewater sample
    (Elsevier Science Sa, 2015) Gupta, Vinod Kumar; Yola, Mehmet Lutfi; Eren, Tanju; Atar, Necip
    Atrazine has become one of the most widely used herbicides which are mainly applied to control broad leaf plants and grassy weeds in the world. Because of its common use has led to the release of atrazine into sediments, wastewater and water sources. The presence of atrazine in wastewaters and water sources may affect ecosystem and human health due to its chronicle toxicity to aquatic organisms. In present study, a sensitive molecular imprinted quartz crystal microbalance sensor was prepared by fabricating a self-assembling monolayer formation of allylmercaptane on gold chip surface for selective determination of atrazine in wastewater. The non-modified and improved surfaces were characterized by using contact angle, Fourier atomic force microscopy and transform infrared spectroscopy. The imprinted quartz crystal microbalance sensor was found to be sensitive, linear, certain, and proper. The linearity range was obtained as 0.08-1.5 nM. The detection limit of the prepared material was calculated as 0.028 nM. The developed quartz crystal microbalance sensor was successfully used to examine wastewater sample. Furthermore, the stability and repeatability of the prepared quartz crystal microbalance sensor were studied. The spectacular long-term stability and repeatability of the prepared atrazine-imprinted quartz crystal microbalance sensor make them intriguing in sensors studies and applications. (C) 2015 Elsevier B.V. All rights reserved.