Selective determination of dopamine in the presence of high concentration of ascorbic acid using nano-Au self-assembly glassy carbon electrode

Hu, Guangzhi; Zhang, David; Wu, Wei-Li; Yang, Zhousheng

doi:10.1016/j.colsurfb.2007.10.001

Cited by 105 publications

(46 citation statements)

References 32 publications

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“…9 Another typical method to attach AuNPs to GC surfaces would be to use bridging reagents. [10][11][12][13] In Ref. 10, by using 4-mercaptobenzenediazonium tetrafluoroborate, benzothiol was bonded to GC via electro-reductive attachment, 14 and then AuNPs were successfully attached to the terminal thiols.…”

Section: -9 Because Aucl4mentioning

confidence: 99%

“…12 A recent paper reported that cysteamine could also be utilized to attach AuNPs to GC via a cyclic voltammetric treatment to form covalent GC-N bonding. 13 In addition to electrochemical and chemical methods, it was reported that the adhesion of AuNPs was possible on electrochemically pretreated GC electrodes. 15 Electroless plating was also utilized to attach AuNPs to the surfaces of GC micro-spheres.…”

Section: -9 Because Aucl4mentioning

confidence: 99%

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Surface Observation for Seed-mediated Growth Attachment of Gold Nanoparticles on a Glassy Carbon Substrate

2009

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A seed-mediated growth method for surface modification was applied to the attachment of gold nanoparticles (AuNPs) to glassy carbon (GC) surfaces. By simply immersing a GC plate at first into a seed solution containing 4 nm Au nano-seed particles and then into a growth solution containing HAuCl4, ascorbic acid and cetyltrimethyammonium bromide, AuNPs could be successfully attached to the GC surface via the growth of nanoparticles. A possible control of the size and density of AuNPs on GC was examined by observing surface images with a field-emission scanning electron microscope (FE-SEM) after several preparations with different immersion times. Compared with previous results on the growth of AuNPs on indium tin oxide (ITO) surfaces, it was characteristic that the AuNPs attached to GC surfaces exhibited smaller size and higher density as well as a flatter and non-crystal-like morphology. In addition, for performing the dense attachment of regular nano-sized AuNPs on GC surfaces, immersion for 2 h into the growth solution was sufficient. Longer immersion for 24 h caused an irregular growth of bold Au micro-crystals, while 24 h was necessary in the case of AuNPs on ITO surfaces. Shorter seeding and growth times were found to be effective for a sparse attachment of smaller Au nanoparticles whose size was ca. 20 nm. It was clarified that the seed-mediated growth method for surface modification was valid for fabricating a nanointerface composed of AuNPs on GC surfaces.

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Section: -9 Because Aucl4mentioning

confidence: 99%

Section: -9 Because Aucl4mentioning

confidence: 99%

Surface Observation for Seed-mediated Growth Attachment of Gold Nanoparticles on a Glassy Carbon Substrate

2009

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“…The most challenging problem in the detection arises mainly due to overlapping of voltammetric signals at many of the solid electrodes and that can be addressed by modifying the working electrode for obtaining well resolved signals. Many modifiers such as polymers, metal oxides and metal complexes have been effectively used together with carbon based materials [5][6][7][8][9] . Graphene a single layer of hexagonal close packed honey comb crystal lattice is being extensively used in various fields such as electronics, optical, magnetic, biological, medicine, energy storage, catalysis etc.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Behaviour of Dopamine on A Glassy Carbon Electrode Modified by Graphene Chitosan Copper Composite

Renjini¹,

Kumar²,

Sreevalsan³

et al. 2017

Orient. J. Chem

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Graphene is a hexagonal honeycombed network of carbon atoms arranged in a single layer which is the fundamental building block of all graphitic materials. The novel properties associated with graphene offer many advantages for electrochemical applications. The present work aims at preparing graphene copper chitosan composite for the voltametric determination of the most prominent catechol amine dopamine. Modified Hummers method was followed for Graphite oxide (GO) preparation. GO and CuSO 4 .5H 2 O were brought into an aqueous solution, to this chitosan was added which was refluxed and subsequently reduced to obtain the required graphene -copper composite. The composite was characterized structurally and morphologically by XRD, SEM and it was used for modifying a glassy carbon electrode. The modified electrode was used for sensing dopamine by CV and DPV. The effect of scan rate and pH on the performance of modified glassy carbon electrode was evaluated. The fabricated electrode was also evaluated for the simultaneous determination of dopamine and uric acid. This electrochemical sensor was found to be most sensitive and reliable at the physiological pH 7.

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“…A number of modification species, including ion-exchange membranes, 13,14 ionic liquid gel membrane, 15 polymer film, 12,[16][17][18] self assembled membranes 19 and gold nanoparticles 20,21 have been employed to improve the selectivity against AA or UA. Ion-exchange membranes, typically Nafion, have been indicated to be capable of preventing the interference from AA and UA.…”

Section: Introductionmentioning

confidence: 99%

A Gold Electrode Modified with Self-Assembled Diethylene- triaminepentaacetic Acid via Charge-based Discrimination

Liu

et al. 2009

ANAL. SCI.

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Selective determination of dopamine in the presence of high concentration of ascorbic acid using nano-Au self-assembly glassy carbon electrode

Cited by 105 publications

References 32 publications

Surface Observation for Seed-mediated Growth Attachment of Gold Nanoparticles on a Glassy Carbon Substrate

Surface Observation for Seed-mediated Growth Attachment of Gold Nanoparticles on a Glassy Carbon Substrate

Electrochemical Behaviour of Dopamine on A Glassy Carbon Electrode Modified by Graphene Chitosan Copper Composite

A Gold Electrode Modified with Self-Assembled Diethylene- triaminepentaacetic Acid via Charge-based Discrimination

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