Tuning the direct growth of Ag<sub>seeds</sub>into bimetallic Ag@Cu nanorods on surface functionalized electrochemically reduced graphene oxide: enhanced nitrite detection

Jeena, S. E.; Gnanaprakasam, P.; Dakshinamurthy, Arun; Selvaraju, T.

doi:10.1039/c5ra05730b

Cited by 17 publications

(14 citation statements)

References 57 publications

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“…Figure 1B shows the successful formation of bimetallic Ag@Pd NRDs on LÀERGO surface by the seed mediated approach with the width dimension of 187 AE 2 nm thickness. The intermediate step SEM image such as growing bimetallic Ag@Cu NRDs at LÀERGO surface has been reported elsewhere [32]. Importantly, the size and shape of the bimetallic NRD didnt vary significantly due to the controlled galvanic replacement reaction of Cu by Pd.…”

Section: Surface and Morphological Studiesmentioning

confidence: 95%

“…The well dispersed GO dispersion with a fine concentration of 0.2 mg/ml is highly stable for more than 8 months. As a result, the dispersed GO should be reduced electrochemically on the surface of glassy carbon electrode (GCE) by cyclic voltammetry technique [32]. Ag@Pd NRDs were grown on LÀERGO/ GCE by two step process.…”

Section: Synthesis Of Ag@pd Nrds On L-ergo Surfacementioning

confidence: 99%

“…Graphite flakes were used as the starting precursor for the synthesis of graphene oxide (GO) by the modified Hummers method [32]. The well dispersed GO dispersion with a fine concentration of 0.2 mg/ml is highly stable for more than 8 months.…”

Section: Synthesis Of Ag@pd Nrds On L-ergo Surfacementioning

confidence: 99%

“…Ag@Pd NRDs were grown on LÀERGO/ GCE by two step process. Initially, Ag@Cu NRDs were grown on the LÀERGO surface by the seed mediated growth approach [32]. Afterwards, Ag@Cu NRDs/LÀ ERGO/GCEs were dipped in 2.4 10 À3 M PdCl 2 for 95 sec for the complete galvanic replacement of Cu by Pd.…”

Section: Synthesis Of Ag@pd Nrds On L-ergo Surfacementioning

confidence: 99%

“…Subsequently, Cu shell would be replaced by Pd through the galvanic replacement method. The one dimensional growth of Ag@Cu NRDs on LÀ ERGO nanosheets by the seed mediated growth approach was reported elsewhere [32]. Further, LÀERGO nanosheets provides a high electroactive surface area for the uniform formation of the bimetallic Ag@Pd NRDs.…”

Section: Introductionmentioning

confidence: 96%

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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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Section: Surface and Morphological Studiesmentioning

confidence: 95%

Section: Synthesis Of Ag@pd Nrds On L-ergo Surfacementioning

confidence: 99%

Section: Synthesis Of Ag@pd Nrds On L-ergo Surfacementioning

confidence: 99%

Section: Synthesis Of Ag@pd Nrds On L-ergo Surfacementioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

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

2016

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Electrochemical Detection of Nitrite Using Glassy Carbon Electrode Modified with Silver Nanospheres (AgNS) Obtained by Green Synthesis Using Pre‐hydrolysed Liquor

Shivakumar¹,

Nagashree²,

Manjappa

et al. 2017

Electroanalysis

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Silver nanospheres (AgNS) with SPR band ∼417 nm was synthesized by Green synthesis, using a pre‐hydrolysed liquor (PHL) of Nilgiri wood without any pretreatment. The synthesis was carried out at room temperature and was complete within three hours. The reduction and stabilization of silver is brought about by hemicelluloses present in the pre‐hydrolysed liquor. Electrochemical oxidation of nitrite on glassy carbon electrode (GCE) modified with the AgNS in 0.1 M phosphate buffer solution (PBS) of pH 7.0 was found to occur at 0.86 V with respect to Ag/AgCl. Electrochemical sensing experiments with AgNS/GCE showed a linear range of detection between 0.1 to 8 μM, with detection limit of 0.031 μM and a sensitivity of 580 μA mM−1cm−2.

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Development of Pen‐type Portable Electrochemical Sensor Based on Au‐W Bimetallic Nanoparticles Decorated Graphene‐chitosan Nanocomposite Film for the Detection of Nitrite in Water, Milk and Fruit Juices

et al. 2021

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The development and fabrication of a simple, portable, and sensitive detection tool to precisely monitor nitrite level is of growing importance in electrochemistry research, given the strong interest in the protection of drinking water quality, treatment of wastewater, food production, and control of remediation processes. This work describes the fabrication of a simple, cost‐effective, pen‐type electrochemical sensor based on bimetallic gold and tungsten nanoparticles electrochemically decorated on graphene‐chitosan modified pencil graphite electrode (PGE) for the trace detection of nitrite in real samples. The prepared nanocomposite was characterized using XRD, SEM, and EDS. The electrochemical behavior of the sensor was evaluated by cyclic voltammetry (CV) and impedance electrochemical spectroscopy (EIS). Results revealed that the proposed sensor displayed excellent electrocatalytic activity towards electro‐oxidation of nitrite with an irreversible redox reaction. The AuNPs‐WNPs@Gr‐Chi/PGE sensor exhibited excellent analytical performance with a wide linear range from 10 to 250 μM towards nitrite. The LOD and LOQ were calculated to be 0.12 μM and 0.44 μM, respectively. The designed electrochemical sensor was successfully applied for the detection of nitrite in water, milk, and natural fruit juice samples.

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Tuning the direct growth of Ag_seedsinto bimetallic Ag@Cu nanorods on surface functionalized electrochemically reduced graphene oxide: enhanced nitrite detection

Abstract: The significant challenges in the growth of 1D nanostructure on reduced graphene oxide surface were addressed. It enabled the electrooxidation of the nitrite ion (NO2−) with high sensitivity and good detection limit of 1 nM.

Cited by 17 publications

References 57 publications

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

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

Electrochemical Detection of Nitrite Using Glassy Carbon Electrode Modified with Silver Nanospheres (AgNS) Obtained by Green Synthesis Using Pre‐hydrolysed Liquor

Development of Pen‐type Portable Electrochemical Sensor Based on Au‐W Bimetallic Nanoparticles Decorated Graphene‐chitosan Nanocomposite Film for the Detection of Nitrite in Water, Milk and Fruit Juices

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Tuning the direct growth of Agseedsinto bimetallic Ag@Cu nanorods on surface functionalized electrochemically reduced graphene oxide: enhanced nitrite detection

Abstract: The significant challenges in the growth of 1D nanostructure on reduced graphene oxide surface were addressed. It enabled the electrooxidation of the nitrite ion (NO2−) with high sensitivity and good detection limit of 1 nM.

Cited by 17 publications

References 57 publications

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

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

Electrochemical Detection of Nitrite Using Glassy Carbon Electrode Modified with Silver Nanospheres (AgNS) Obtained by Green Synthesis Using Pre‐hydrolysed Liquor

Development of Pen‐type Portable Electrochemical Sensor Based on Au‐W Bimetallic Nanoparticles Decorated Graphene‐chitosan Nanocomposite Film for the Detection of Nitrite in Water, Milk and Fruit Juices

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Tuning the direct growth of Ag_seedsinto bimetallic Ag@Cu nanorods on surface functionalized electrochemically reduced graphene oxide: enhanced nitrite detection