Unzipped catalytic activity of copper in realizing bimetallic Ag@Cu nanowires as a better amperometric H2O2 sensor

Easow, Jeena Susan; Selvaraju, T.

doi:10.1016/j.electacta.2013.09.033

Cited by 54 publications

(27 citation statements)

References 36 publications

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“…In the Ag seeds electrode, Ag undergoes stripping at 0.23 V, whereas in the presence of Cu on the Ag surface at the Ag@Cu bimetallic NRDs electrode, a noticeable decrease in the overpotential was observed such as 0. 13 V [51]. This validates the presence of bimetallic Ag and Cu on the electrode surface.…”

Section: Surface Characterisationsupporting

confidence: 52%

“…Then the electrodes were washed with distilled water and dried at room temperature. Now the electrode was set to grow Ag@Cu bimetallic NRDs with a modified seedmediated growth method [51,52]. The synthesis of Ag seeds was reported elsewhere [51].…”

Section: Fabrication Of Ag@cu Nanorods On Glassy Carbon Electrodementioning

confidence: 99%

“…Now the electrode was set to grow Ag@Cu bimetallic NRDs with a modified seedmediated growth method [51,52]. The synthesis of Ag seeds was reported elsewhere [51]. Briefly, in the first step, Nafion Ò (5 ll, 0.5 wt%) coated GCE (GCE/ Nf) was dipped in Ag seeds solution for 30 min and then dried for 1 h. Ag seeds tend to attach to the surface of GCE/Nf as Ag seeds /Nf/GCE.…”

Section: Fabrication Of Ag@cu Nanorods On Glassy Carbon Electrodementioning

confidence: 99%

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Synergistic effect of bimetallic Ag@Cu nanorods modified electrode for enhanced electrochemical sensing of thiocyanate ions

2015

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The thiocyanate (SCN -) level in human saliva, serum, and blood has been considered as a biomarker for analyzing the practice of cigarette smokers. Here, we have developed a highly sensitive and selective electrochemical sensor for SCN -in phosphate buffer using an Ag@Cu bimetallic nanorods (NRDs) modified glassy carbon electrode (GCE). The bimetallic Ag@Cu NRDs were grown on the GCE surface by a simple seedmediated growth method. Initially, Ag seeds were deposited on the Nafion coated GCE. The deposited Ag seeds in turn accelerate the growth of bimetallic Ag@Cu NRDs in the presence of cetyltrimethyl ammonium bromide, which acts as a soft template for the onedimensional growth of NRDs. The synthesised NRDs were characterized by scanning electron microscopy and energy dispersive X-ray spectroscopy measurements. The Ag@Cu NRDs modified electrode shows an excellent response towards the electrochemical oxidation of SCN -. Cyclic voltammetry was used to study the linear correlation of SCN -oxidation between 1 and 10 mM, and, subsequently, 10 nM was achieved as the detection limit with a signal to noise ratio (S/N = 3) for Ag@Cu bimetallic NRDs modified GCE. This unique sensor shows a high selectivity towards trace amounts of SCN -in the presence of various interfering cations and anions. It satisfactorily recognized the generated SCN -in a real-time application such as in human saliva. Finally, the fingerprint of SCN -existence in the saliva samples of cigarette smokers and non-smokers were differentiated in a short span of time with ease.

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Section: Surface Characterisationsupporting

confidence: 52%

Section: Fabrication Of Ag@cu Nanorods On Glassy Carbon Electrodementioning

confidence: 99%

Section: Fabrication Of Ag@cu Nanorods On Glassy Carbon Electrodementioning

confidence: 99%

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Synergistic effect of bimetallic Ag@Cu nanorods modified electrode for enhanced electrochemical sensing of thiocyanate ions

2015

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“…In this sense, the indicate that the recoveries of H 2 O 2 ranging from 98.5% to 108.0% have been obtained with the RSD of less than 7.4% (Table 1), and the milk sample without spiked H 2 O 2 did not show any detectable ECL signal (data not shown). Note that that compared with some previous reports where 1.8 g (NH4) 2 SO 4 was added into 10 mL milk sample with vigorous stirring for 30 min, and then 10-15 min centrifugation was carried out at 8000 rpm and the supernatant liquid was collected for analysis [46,47], the proposed method is simple and rapid, without the complicated sample pretreatment.…”

Section: Application To Real Samplesmentioning

confidence: 95%

A low-cost, ultraflexible cloth-based microfluidic device for wireless electrochemiluminescence application

Liu

Wang

et al. 2016

Lab Chip

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The rising need for low-cost diagnostic devices has led to the search for inexpensive matrices that allow performing alternative analytical assays. Cloth is a viable material for the development of analytical devices due to its low material and manufacture costs, ability to wick assay fluids by capillary forces, and potential for patterning multiplexed channel geometries. In this paper, we describe the construction of low-cost, ultraflexible microfluidic cloth-based analytical devices (μCADs) for wireless electrochemiluminescence based on closed bipolar electrodes (C-WL-ECL), employing extremely cheap materials and a manufacturing process. The C-WL-ECL μCADs are built with wax-screen-printed cloth channels and carbon ink screen-printed electrodes, and the estimated cost per device is only $0.015. To demonstrate the performance of C-WL-ECL μCADs, the two most commonly used ECL systems - tris(2,2'-bipyridyl)ruthenium(ii)/tri-n-propylamine (Ru(bpy)3(2+)/TPA) and 3-aminophthalhydrazide/hydrogen peroxide (luminol/H2O2) - are applied. Under optimized conditions, the C-WL-ECL method has successfully fulfilled the quantitative determination of TPA with a detection limit of 0.085 mM. In addition, on the bent μCADs (bending angle (θ) = 180°), the luminol/H2O2-based ECL system can detect H2O2 as low as 0.024 mM. Based on such an ECL system, the bent μCADs are further used for determination of glucose in a phosphate buffer solution (PBS), with the detection limit of 0.195 mM. Finally, the applicability and validity, anti-interference ability, and storage stability of the C-WL-ECL μCADs are investigated. The results indicate that the proposed device has shown potential to extend the use of microfluidic analytical devices, due to its simplicity, low cost, ultraflexibility, and acceptable analytical performance.

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“…CV responses of bimetallic Ag@Cu/L-ERGO/GCE have been studied in N 2 saturated 0.5 M H 2 SO 4 indicating the presence of Cu at the bimetallic NRDs surface where the overpotential for the dissolution of Ag has decreased by simultaneous oxidation of Ag and Cu [32,33]. On the other hand, after the replacement of shell like second metal such as Cu at Ag NRDs by Pd surface, the corresponding Ag and Cu oxidation peaks were completely vanished and a characteristic hydrogen adsorption and oxidative desorption electrochemical behaviour has observed which confirmed the presence of Pd surface as shell metal at Ag NRDs.…”

Section: Electrochemical Characterisationsmentioning

confidence: 99%

Electroreduction of Nitroaromatic Compounds at Electrochemically Reduced Graphene Oxide Supported Bimetallic Ag@Pd Nanorods Modified Electrodes

2016

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The design and fabrication of nanostructured electrode with high activity at low cost are crucial elements in studying the toxicity of environmental pollutants. Here, we develop a combined step of generating Electrochemically Reduced Graphene Oxide (ERGO) nanosheets on the surface of the glassy carbon electrode where an effective seed mediated growth followed by a galvanic exchange process were introduced for the direct growth of Ag core @Pd shell nanorods (Ag@Pd NRDs). The resulting electrode possesses a large surface area, interconnected porous networks, uniform distribution of bimetallic Ag@Pd NRDs with extremely thin size of Pd generation and good electrical conductivity, which are highly desirable for the electrocatalytic reduction of nitroaromatic compounds (NACs). In the fabrication step, the shell like Cu at the bimetallic NRDs acts as a sacrificial template for forming a thin layer of Pd at Ag NRDs surface by redox replacement reaction. Thus, the resultant Ag@Pd NRDs on ERGO modified electrode was profoundly tested for the electrochemical sensing of NACs with high sensitivity, selectivity and a very low detection limit of 1.8×10−11 M. Differential Pulse Voltammetry (DPV) was used to study the linear range of 4‐nitroaniline (4‐NA) between 1.0×10−9 M and 1.2×10−8 M. The modified electrode exhibits better reproducibility and long term stability. In addition, the modified electrode out performed well in the real sample analysis containing NACs in the presence of different interfering cations and anions.

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Unzipped catalytic activity of copper in realizing bimetallic Ag@Cu nanowires as a better amperometric H2O2 sensor

Cited by 54 publications

References 36 publications

Synergistic effect of bimetallic Ag@Cu nanorods modified electrode for enhanced electrochemical sensing of thiocyanate ions

Synergistic effect of bimetallic Ag@Cu nanorods modified electrode for enhanced electrochemical sensing of thiocyanate ions

A low-cost, ultraflexible cloth-based microfluidic device for wireless electrochemiluminescence application

Electroreduction of Nitroaromatic Compounds at Electrochemically Reduced Graphene Oxide Supported Bimetallic Ag@Pd Nanorods Modified Electrodes

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