جستجوی مقالات مرتبط با کلیدواژه "multiwalled carbon nanotubes" در نشریات گروه "علوم پایه"
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نشریه شیمی کاربردی روز، پیاپی 70 (بهار 1403)، صص 293 -312در این کار تحقیقاتی، یک حسگر الکتروشیمیایی ساده و گزینش پذیر با حساسیت بالا برای تعیین داروی دوپامین پیشنهاد شد. برای این منظور، از یک نانوکامپوزیت متشکل از نیکل- نانولوله های کربنی چند جداره و نانوذرات تیتانیوم دی اکساید برای اصلاح الکترود خمیرکربن استفاده شد. مورفولوژی سطح حسگر اصلاح شده توسط میکروسکوپ الکترونی روبشی گسیل میدانی (FESEM) و طیف سنجی مادون قرمز تبدیل فوریه (FTIR) ارزیابی شد. روش های ولتامتری چرخه ای (CV)، ولتامتری پالس تفاضلی (DPV) و طیف سنجی امپدانس الکتروشیمیایی (EIS) برای تجزیه و تحلیل رفتار الکتروشیمیایی الکترود اصلاح شده پیشنهادی و تعیین خصوصیات الکتروشیمیایی دوپامین به کار رفتند. الکترود اصلاح شده به کاررفته در این پژوهش یک پاسخ الکترواکسیداسیون عالی به حضور دوپامین نشان داد. علاوه بر این، برای بهینه سازی پاسخ حسگر الکتروشیمیایی، هر گونه تغییر در رفتار ولتامتری دوپامین تحت شرایط pH و سرعت های روبش مختلف مورد بررسی قرار گرفت. تحت شرایط بهینه، جریان پیک الکتروکاتالیستی دوپامین، به غلظت دوپامین در محدوده µM 100- 3/0 به صورت خطی وابسته بوده و حد تشخیص nM 68/11 برای آن محاسبه شد. همچنین، پارامترهای الکتروشیمیایی مانند تعداد الکترون های منتقل شده و ضریب انتقال الکترون نیز برآورد شدند. یافته های مطالعه حاضر نشان دادند که حسگر موردنظر دارای حساسیت بالا، حد تشخیص کم، پاسخ سریع، پایداری طولانی مدت، قابلیت تکرارپذیری و تجدیدپذیری قابل توجه، گزینش پذیری و بازیابی بالا و همچنین، عملکرد عالی در تشخیص آنالیت در نمونه های حقیقی است که ثابت می کند الکترود پیشنهادی، برای کاربردهای صنایع غذایی، پزشکی و زیست محیطی کاملا قابل استفاده می باشد. روش پیشنهادی ساده، سریع و ارزان است و می تواند به عنوان یک ابزار تحلیلی ارزشمند در کنترل کیفیت صنعت داروسازی مورد استفاده قرار گیرد.کلید واژگان: حسگر الکتروشیمیایی, دوپامین, الکترود خمیرکربن, نانوکامپوزیت, نانولوله های کربنی چند جداره, نانوذرات تیتانیوم دی اکسایدIn this research, a simple and selective electrochemical sensor with high-sensitivity was proposed to detect dopamine. For this purpose, a nanocomposite consist of nickel-multiwalled carbon nanotubes and titanium dioxide nanoparticles was used to modify the carbon paste electrode. The surface morphology of the modified sensor was evaluated by field emission scanning electron microscopy (FESEM) and Fourier transform infrared spectrometry (FTIR). Cyclic voltammetry (CV), differential pulse voltammetry (DPV) and electrochemical impedance spectroscopy (EIS) techniques were used to analyze of the proposed modified electrode electrochemical behavior and to characterize dopamine. The modified electrode used in this study showed an excellent electro-oxidation response to the presence of dopamine. In addition, to optimize the electrochemical sensor response, any change in the voltammetric behavior of dopamine under different pH and scan rates conditions were investigated and phosphate buffer solution was used for this purpose. Under optimal conditions, the dopamine electrocatalytic peak currents are linearly dependent on the dopamine concentration in the range of 0.3-100 µM and the detection limit of 11.68 nM was calculated for it. Also, electrochemical parameters such as the transferred electrons number and the electron transfer coefficient were estimated. The present study findings showed that the sensor has high sensitivity, low detection limit, fast response, long-term stability, significant repeatability and reproducibility, high selectivity and recovery, as well as excellent performance in analyt detection in the real samples, which proves that the proposed electrode can be used in food, medical and environmental applications. The proposed method is simple, fast and inexpensive and can be used as a valuable analytical tool in quality control of the pharmaceutical industry.Keywords: Electrochemical sensor, Dopamine, Carbon paste electrode, Nanocomposite, multiwalled carbon nanotubes, titanium dioxide nanoparticles
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A novel photoelectrocatalyst composed from multiwalled carbon nanotubes (MWCNTs), titanium dioxide (TiO2) and gold-platinum bimetallic nanoparticles (Au–PtNPs) was prepared on the surface of a fluorine-tin oxide (FTO) electrode and it was used for electrooxidation of ethanol molecules. Multiwalled carbon nanotubes were utilized as the catalyst support to improve the electrical transmission. The TiO2 nanoparticles were transferred onto the surface of MWCNTs/FTO modified electrode and then, the surface of the electrode was coated with gold-platinum nanoparticles. The surface morphology and chemical composition of the prepared Au-Pt/TiO2/MWCNTs photoelectrocatalyst were characterized using scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) spectroscopy. The fabrication process of the photoelectrocatalyst was investigated by cyclic voltammetry and chronoamperometry techniques. The exchange current densities (J0) were calculated for Pt/FTO, Pt/MWCNTs/FTO, Pt/TiO2/MWCNTs/FTO and Au-Pt/TiO2/MWCNT/FTO electrodes and they were found to be: 4.10 × 10-5, 6.06 × 10-5, 1.45 × 10-4 and 1.89 × 10-4 mA cm-2, respectively. Also, the values of J0 for Pt/TiO2/MWCNTs/FTO and Au-Pt/TiO2/MWCNTs/FTO in the presence of light were obtained 2.0 × 10-4 and 5.1 × 10-4 mA cm-2, respectively. The obtained results reveal that the Au-Pt/TiO2/MWCNTs/FTO electrode has the higher J0 value in the presence of UV-Vis light and the light irradiation can accelerate the ethanol oxidation process. The experimental results showed that the proposed photoelectrocatalyst has an excellent catalytic activity for oxidation of ethanol molecules under the UV-Vis light irradiation which is due to the synergistic effect between the TiO2 photocatalyst and gold-platinum electrocatalyst.
Keywords: Photoelectrocatalyst, Multiwalled carbon nanotubes, Titanium dioxide, Gold-platinum nanoparticles, Fluorine-tin oxide, Electrooxidation of ethanol -
یک حسگر جدید بوپرنورفین (BPR) بر اساس الکترود کربن شیشه ای اصلاح شده با با پلی پیرول اوراکسیدایز داپ شده با آنیون بنزن-1و3-دی سولفونات برروی نانولوله های کربن چنددیواره ساخته شده است. نانولوله های کربنی بر روی یک الکترود برهنه تخلیه و خشک شدند و سپس یک لایه نازک از پلی پیرول اوراکسیدایز داپ شده با بنزن-1و3-دی سولفونات به صورت الکتروشیمیایی روی آن تشکیل شد. اثر شرایط آزمایش شامل pH الکترولیت حامل، اندازه قطره سوسپانسیون نانولوله های کربنی و تعداد چرخه های پتانسیل در پلیمریزاسیون اضافه اکسید شده با نظارت بر پاسخ های ولتامتری الکترود اصلاح شده، بهینه سازی شد. سپس از الکترود اصلاح شده بهینه سازی شده برای اندازه گیری الکتروشیمیایی BPR توسط ولتامتری پالس دیفرانسیل استفاده شد که یک رشد خطی با حساسیت بالا در جریان های پیک آندی در محدوده غلظت 40-0.06 میکرومولار از BPR و حد تشخیص 28 نانومولار نشان داد. سرانجام ، اندازه گیری BPR در نمونه های واقعی ادرار توسط حسگر جدید انجام شد و نتایج رضایت بخشی به دست آمد.
کلید واژگان: بوپرنورفین, نانولوله های کربن چنددیواره, پلی پیرول اوراکسیدایز, نانوکامپوزیت, حسگر الکتروشیمیایی, ولتامتری پالس تفاضلیA novel Buprenorphine (BPR) sensor is fabricated based on nanocomposite film of benzene-1,3-disulfonate anion doped overoxidized polypyrrole/multiwalled carbon modified glassy carbon electrode. The carbon nanotubes were drop-casted on bare electrode, and then thin layer of benzene-1,3-disulfonate-doped overoxidized polypyrrole formed electrochemically on it. Effect of experimental conditions involving supporting electrolyte pH, carbon nanotubes suspension drop size, and the number of potential cycles in overoxidized polymerization were optimized by monitoring the voltammetry responses of the modified electrode. Then the optimized modified electrode was used for electrochemical sensing of BPR by differential pulse voltammetry, which exhibited a linear growth with high sensitivity in anodic peak currents at the BPR concentration range of 0.06-40 µM, and a detection limit of 28 nM. Finally, the determination of BPR in urine real samples was performed by the new sensor and satisfactory results obtained.
Keywords: Buprenorphine, Multiwalled carbon nanotubes, Overoxidized polypyrrole, Nanocomposite, electrochemical sensor, Differential pulse voltammetry -
The analysis of organochlorine pesticides (OCPs) residues has received an increasing attention in the last decades. Thesolid-phase microextration (SPME) is a convenient and fast analytical method, which has been widely used for the determination of volatile and semivolatile organic compounds in aqueous samples. In this study, the multiwalled carbon nanotubes/polypyrrole composite (MWCNTs-PPy) coated on steel fiber was used for extraction OCPs from water samples by the SPME technique. The effects of various parameters on the efficiency of SPME process such as extraction time, extraction temperature, ionic strength, desorption time, and desorption temperature were studied. Under optimized conditions, the detection limits for the OCPs varied between 0.051 and 0.39 pg mL-1, the inter-day and intra-day relative standard deviations for various OCPs using a single fiber were 6.5-11.5% and 3.6-11.5, respectively. The linear ranges varied between 0.001 and 1 ng mL-1. The proposed method was successfully applied to the analysis of ground water samples with the recoveries from 86 to 110%
Keywords: Organochlorine pesticides, Multiwalled carbon nanotubes, Polypyrrole composite, Solid phase microextraction, Gas chromatography -
Functionalized Multi-walled carbon nanotubes (f-MWCNTs) which are modified using nitric acid and sulfuric acid were evaluated to synthesize a uniform nanocomposite via application of TiO2. The f-MWCNTs-TiO2 nanocomposites have been produced via using the chemical simple two-step method. To characterize the structural analysis, scanning electron microscopy (SEM) imaging, ultraviolet-visible (UV-Vis) spectroscopy, and Raman spectroscopy were utilized. The maximum shift of D, G, and 2G-bands of f-MWCNTs were related to 20 wt. % f-MWCNTs in TiO2 nanoparticles. Moreover, an up-shift of 40 cm-1 was recorded for the MWCNTs (G’-band) for 5 wt. % f-MWCNTs. For 20 wt. % f-MWCNTs/TiO2 (G-band) nanocomposites, was determined by 4.7%. By increasing the amount of f-MWCNTs in f-MWCNs/TiO2 nanocomposite, the compressive strain was increased. Among the four bonds, the G’-band behaved differently against increasing f-MWCNTs. The shifting frequency of G-band indicates the strong interaction between f-MWCNTs and TiO2 nanoparticles. The interaction between f-MWCNTs and TiO2 nanoparticles identified by the Gruneisen parameter. Therefore, a mechanism generated for stress transfer at the interface between f-MWCNTs and TiO2 nanoparticles which is indicated in many significant increases obtained in the mechanical and acoustical properties.Keywords: Compressive Strain, Multiwalled carbon nanotubes, nanocomposites, Raman spectroscopy, Titanium dioxide
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A novel chemically modified electrode was constructed based on multi-walled carbon nanotubes, MCM48 molecular sieve composite modified glassy carbon electrode .The modified electrode showed that it can be used for simultaneous determination of acetaminophen (ACT) and codeine (COD), simultaneously. The measurements were carried out by the application of differential pulse voltammetry (DPV), cyclic voltammetry (CV) and chronoamperometry (CA) methods. The fabricated sensor revealed some advantages such as excellent selectivity, good stability and high sensitivity toward ACT and COD determination. Application of DPV method under the optimum conditions showed the modified electrode provides linear responses versus ACT concentrations in the range of 0.2-40 µM and 80-350 µM. The results for COD showed the linear responses in the ranges of 4-70 µM and 150-400 µM respectively using DPV method. The modified electrode was used for determination of ACT and COD in real samples like human blood serum and plasma with satisfactory results.Keywords: Acetaminophen, Codeine, Multiwalled carbon nanotubes, MCM-48
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Gallic acid (GA) is the main phenolic antioxidant which has been subjected of many studies because of its important biological properties including anticancer, anti-inflammatory and antimicrobial activities as well as free radicals scavenger and cardiovascular diseases protector. Hereupon, fabricating a selective and sensitive sensor for GA detection and measurement is an important issue. In this paper a carboxylated MWCNTs modified carbon paste electrode (MWCNTs-COOH/CPE) was successfully fabricated and employed for GA determination. Activating the carboxylic sites of the MWCNTs carried out in nitric acid solution in ultrasonic bath and further studied by field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy. The electrocatalytic oxidation of GA at the MWCNTs-COOH/CPE surface was studied by cyclic voltammetry (CV) and differential pulse voltammetry (DPV) methods. The GA presented a high electrochemical response on MWCNTs-COOH/CPE at pH 2 in comparison with the CPE. This sensor showed a linear response range of 0.33 - 196 µM and detection limit of 17.2 nM (S/N = 3). Furthermore, the designed MWCNTs-COOH/CPE was successfully applied as a electrochemical sensing system for GA determination in extracts of Camellia sinensis, Viola odorata L, Commiphora mukul, and Vitex agnus-castus respectively with estimated amount of 11.4, 8.9, 11.91 and 2.9 mg L-1 GA in each extract.Keywords: Carbon paste electrode, Electrochemical sensor, Gallic acid, Antioxidant Capacity, Multiwalled carbon nanotubes, Plants extracts
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In this paper, a new stable and sensitive electrochemical sensor was prepared by two-fold modification of glassy carbon electrode (GCE) with poly-alizarin red S (AzrS) and multiwalled carbon nanotubes (MWCNTs). The fabricated poly-AzrS/MWCNTs/GCE modified chemical sensor was employed towards the investigation of electrocatalytic oxidation of serotonin in 0.1 mol/dm3 phosphate buffer (PBS) solution of pH 6.0 with the help of voltammetric techniques such as cyclic voltammetry (CV), differential pulse voltammetry (DPV) and electrochemical impedance spectroscopy (EIS). The developed electrochemical sensor exhibited a potent and persistent electron mediating behaviour towards the serotonin determination and also lavishly resolved oxidation peaks for serotonin and epinephrine (EP) simultaneously. The effect of experimental variables, such as potential scan rate, solution pH, simultaneous determination, accumulation time, impedance and concentration were examined. The limit of detection (LOD) and limit of quantification (LOQ) were found to be as 1.8×10-7 mol/dm3 and 17.52×10-7 mol/dm3, respectively with a dynamic range from 0.5×10-6 to 1.1×10-5 mol/dm3. The fabricated electrochemical sensor was applied for the direct determination of serotonin in blood serum samples. Further the fabricated two-fold modified electrochemical sensor exhibited good sensitivity, stability and reproducibility in comparison with bare GCE towards the determination of serotonin.Keywords: Alizarin red S, Epinephrine, Glassy carbon electrode, Multiwalled carbon nanotubes, Simultaneous determination, Serotonin
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Analytical and Bioanalytical Chemistry Research, Volume:4 Issue: 2, Summer - Autumn 2017, PP 189 -200In this paper, magnetically multiwalled carbon nanotubes (MMWCNTs) nanocomposite modified by methyl-2-[2-(2-2-[2-(methoxycarbonyl) phenoxy] ethoxyethoxy) ethoxy] benzoate was applied for magnetic solid-phase extraction (MSPE) of thallium(I) ions. Fourier transform infrared (FT-IR) spectroscopy, field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD) spectrometry and vibrating sample magnetometer (VSM) were used to characterize the magnetic sorbent. The effects of as pH, sample volume, eluent, and interfering ions were studied. Under the optimized conditions, the preconcentration factor of 100 and the linear response over 3−280 µg L−1 were obtained. The detection limit of the suggested procedure (LOD, 3Sb/m) was found to be 0.59 µg L−1. The relative standard deviation for six replicate detection of 100 µg L−1 of Tl(I) was ±1.9%. Finally, the developed method was utilized for the determination of thallium(I) ions in different real samples with recoveries in the range of 96.9102.2% for the spiked samples. The proposed MSPE method exhibited some advantages, such as simplicity, rapidity, high sensitivity and excellent precision. In addition, the mechanism of thallium extraction by modified nanocomposite was proposed.Keywords: Magnetic solid phase extraction, Nanocomposite, Thallium(I), Multiwalled carbon nanotubes, Flame atomic absorption spectrometry, Heavy metals
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A novel analytical approach has been developed and evaluated for the quantitative analysis of paraquat herbicides which can be found at trace levels in the presence of ascorbic acid and uric acid. The experimental results suggest that a carbon ionic liquid electrode modified with multi-walled carbon nanotubes and nickel hydroxide nanoparticles accelerates the electron transfer reactions of paraquat. The best responses were obtained with differential potential and chronoamperometry methods in Phosphate buffer (pH, 7.5). The influence of various parameters on the electrode was investigated. Under the optimized working conditions, calibration graphs were linear in the concentration ranges of 0.0025–25 mg L-1 with a detection limit (S/N=3.0) of 0.8 ppb. The proposed electrode was used for determination of paraquat in fruits and River water samples with satisfactory results.Keywords: Paraquat, Room temperature ionic liquid, Nickel hydroxide nanoparticles, Multiwalled carbon nanotubes, Carbon ionic liquid electrode
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Multiwalled carbon nanotubes (MWCNTs) have been functionalized with -SO3H groups using new three steps chemical routes. Firstly, OH groups have been attached to CNT surfaces through a radical reaction. The second step involves converting the hydroxyl groups into the oxide one and last step included the attachment of –SO3H groups on the MWCNTs surfaces in the presence of 1-butyl-3-methyl imidazolium tetrafluoroborate [bmim]BF4 ionic liquid as catalyst. Functionalized MWCNTs were characterized by Fourier transform infrared (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and Raman Spectroscopy. Obtained product have be used as acidic nano catalyst in the Biginelli reaction for the synthesis of 3,4-dihydropyrimidin-2(1H)-one derivatives. The reaction was performed under solvent-free conditions with excellent yields and short reaction times in the presence of a reusable efficient catalyst.Keywords: Multiwalled carbon nanotubes, Functionalization, Sulfonation, [bmim] BF4 Ionic liquid, MWCNTs, SO3H, Biginelli reaction, Dihydropyrimidinones
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Functionalization of multiwalled carbon nanotubes (MWCNTs) with NH2 groups under a one pot reaction is studied. During the first step of the reaction, Cl and CHCl2 groups were attached to the surfaces of MWCNTs through an electrophilic addition reaction. In the second step of process, Cl atoms were replaced with NH2 and amino groups (ethylene diamine and butyl amine) under a nucleophilic substitution reaction. The aminated MWCNTs have high solubility and dispersion stability in organic solvents and polymeric matrixes. FTIR, XRD, TGA and Raman spectroscopy were used for characterization of the achieved products. The analysis results indicate that the MWCNTs functionalized with high concentration of amino groups. Also, treated CNTs show good dispersity and interfacial compatibility when used to make MWCNT/polymer composites. Proposed method is an efficient route to introduce of amino groups onto the surfaces of MWCNTs and the process is a very effective, clean, safe and easy to operate, and the scale up of this method is easy.Keywords: Amination, Functionalization, Multiwalled carbon nanotubes, One Pot, Solubilization
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لایه های هیبریدی متشکل از 3WO / MWNTs به روش چرخشی بر روی زیر لایه آلومینا لایه نشانی شدند. مورفولوژی، ترکیبات شیمیایی، ساختار بلوری، کیفیت مواد و اندازه نانوذرات اکسید تنگستن، نانولوله های کربنی و لایه های حساس هیبریدی با استفاده از آنالیزهای،TEM Raman، XRD، XPS، SEM و DLS مورد بررسی قرار گرفت. نتیجه آنالیزها نشان دادند که گروه های عاملی اکسیژنی بر سطح نانولوله های عامل دار ایجاد شده اند. این عامل های اکسیژنی سبب پخش شدگی نانولوله ها در یاخته حاوی نانوذرات اکسید تنگستن و شکل گیری نانوذرات برسطح نانولوله ها می شود. در نتیجه، پوشش کاملی از ذرات اکسید تنگستن بر سطح نانولوله های کربنی ایجاد می شود. بعد از لایه نشانی و پخت لایه ها در دمای oC350 پاسخ لایه های هیبریدی نسبت به گاز هیدروژن مورد مطالعه قرار گرفت. افزودن مقادیر کمتر از 005/0 درصد وزنی از نانولوله های کربنی نسبت به تنگستن، سبب بهبود خواص حسگری لایه های هیبریدی می شود به طوری که با افزودن مقدار 003/0 درصد وزنی از نانولوله های کربنی نسبت به تنگستن، افزایش 50 برابری نسبت به لایه اکسید تنگستن خالص در پاسخ به غلظت ppm 10000 گاز هیدروژن به دست آمد. علاوه بر این، نتاج نشان می دهد حد شناسایی این ساختارها به گاز هیدروژن به ppm 10 می رسد. با افزودن نانولوله های کربنی، دمای کار از oC400 در لایه های اکسید تنگستن خالص به oC 200 در لایه های هیبریدی کاهش یافت. افزایش پاسخ لایه های هیبریدی نتیجه افزایش سطح موثر و تعداد سد پتانسیل های حساس به گاز در محل اتصال نانوذرات اکسید تنگستن به یکدیگر و همچنین با نانولوله های کربنی می باشد.
کلید واژگان: حسگرهای هیبریدی گاز, حسگرهای گاز هیدروژن, نانولوله های کربنیThe WO3/MWNTs hybrid gas sensitive films were prepared by spin-coating on alumina substrate. The structure، morphology and chemical composition of the functionalized MWNTs and WO3/MWNTs hybrid films were studied by SEM، TEM، XRD، Raman، DLS and XPS methods. The MWCNT were initially functionalized (f-MWNTs). Dispersion and surface reactivity of MWNTs was improved because of oxygenate groups on MWNTs surface. Results showed WO3 nanoparticles were nucleated on oxygenated group on surface of f-MWNTs in hybrid suspension. After coating and annealing the films at 350، the response of hybrid WO3/MWNTs films was measured. In addition، adding a little amount of MWNTs (the ratio of MWNTs/W less than 5/1000 wt%) increased the hydrogen sensitivity so that the hybrid films showed an increase of 50 times compared to pure tungsten oxide layer in response to the 10000 ppm hydrogen concentration. Considering the results، the identification of these structures appear tobe 10 ppm hydrogen gas. With the addition of carbon nanotubes، the working temperature of pure tungsten oxide layers (400) reduced to 200 in hybrid layer. The gas sensitivity is suggested to have risendue to mainly the increase in the surface area as well as development of two types of depletion layers، one at the WO3/ MWNTs hetero junction and the other at WO3 grain boundaries.Keywords: hybrid structure gas sensors, hydrogen sensors, multiwalled carbon nanotubes -
A film of multiwalled carbon nanotubes (MWCNT) was casted on the surface of an ionic liquid (IL) modified carbon paste electrode (CPE) to established a modified electrode denoted as MWCNT/IL/CPE. The electrochemical reduction of furazolidone (Fu) was investigated with cyclic voltammetry. The constructed electrode (MWCNT/IL/CPE) exhibited excellent electrocatalytic behavior toward the reduction of Fu as evidenced by the enhancement of the reduction peak current and the shift in the cathodic potential to less negative values (by 20 mV) in comparison with the bare CPE. The formal potential, E0', of Fu is pH dependent with a slope of -53.1 mV per unit of pH, close to the anticipated Nernestian value of -59 mV for a 4-electron and 4-proton process. A detailed analysis of cyclic voltammograms gave fundamental electrochemical parameters including the electroactive surface coverage (Г), the transfer coefficient () and the standard rate constant (ks). A linear calibration curve was obtained for Fu detection in the concentration range of 50-800 mol L-1 of detection limit 33 mol L-1.Keywords: Ionic Liquid, Cyclic Voltammetry, Multiwalled Carbon Nanotubes, Furazolidone, Modified Electrode
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A carbon paste electrode (CPE) modified by multiwalled carbon nanotubes (MWCNTs) and banana tissue was used for detection of dopamine (DA). The modified electrode show good selectivity toward DA in the presence of ascorbic acid (AA). The electrochemical determination of DA at the surface of modified electrode was investigated by differential pulse voltammetry (DPV). The linear curve was obtained in the range of 10-3 μM. The detection limit (3σ) was 2.09 μM for DA. Also the stability of modified electrode was investigated after 20 days, and results show that the modified has relatively good stability.Keywords: Multiwalled Carbon Nanotubes, Banana Tissue, Carbon Paste, Dopamine, Differential Pulse Voltammetry
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