Electrocatalytic activities of gold-5-amino-2-mercaptobenzimidazole-Mn+ self-assembled monolayer complexes (Mn+: Ag+, Cu2+) for hydroquinone oxidation investigated by CV and EIS

Shervedani, Reza Karimi; Hatefi-Mehrjardi, Abdolhamid; Siadat-Barzoki, Saied Mohsen

doi:10.1016/j.electacta.2007.12.079

Cited by 18 publications

(14 citation statements)

References 72 publications

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“…Different electrochemical methods were used to verify formation of the Au-6A2MBT SAM, evaluate surface coverage (q) of Au electrode, and characterize the electrode/solution interface behavior towards the DA in this work [35,36]. defects, provided that the monolayer is stable enough in the potential range of gold oxide formation [44].…”

Section: Electrochemical Verification Of Au-6a2mbt Sam Formation and mentioning

confidence: 99%

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Electrochemical Characterization of Gold 6‐Amino‐2‐mercaptobenzothiazole Self‐Assembled Monolayer for Dopamine Detection in Pharmaceutical Samples

2010

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A new sensor, gold-6-amino-2-mercaptobenzothiazole (6A2MBT), was fabricated via a self-assembly procedure. Electrochemical properties of the monolayer were investigated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The modified electrode showed excellent antifouling property against the oxidation products of DA, allowed us to construct a dynamic calibration curve with two linear parts, 1.00 Â 10 À6 to 3.72 Â 10 À4 and 3.72 Â 10 À4 to 6.42 Â 10 À4 M DA, with correlation coefficients of 0.997 and 0.992 and a detection limit of 1.57 Â 10 À7 M DA by using differential pulse voltammetry (DPV), respectively. Finally, the performance of the Au-6A2MBT modified electrode was successfully tested for electrochemical detection of DA in a pharmaceutical sample.

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Section: Electrochemical Verification Of Au-6a2mbt Sam Formation and mentioning

confidence: 99%

“…Some of the compounds that seem to be promising for these purposes are mercaptobenzazoles (MBs). In our recent papers, the general behavior [35,36], metal affinity [37] and catalytic activities of some of the Au-MBs SAMs modified with metal cations [35,38] were reported.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Characterization of Gold 6‐Amino‐2‐mercaptobenzothiazole Self‐Assembled Monolayer for Dopamine Detection in Pharmaceutical Samples

2010

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“…Preparation, characterization, and electrocatalytic behavior of Au-5A2MBI-M n+ electrode by EIS and CV were reported earlier [28]. Briefly, different methods were used to verify formation of the Au-5A2MBI SAM and evaluate the surface coverage of Au electrode.…”

Section: Characterization Of Au-5a2mbi Sam Modified Electrodementioning

confidence: 99%

“…The incorporation of redox active units into SAM thin films is important because it allows electrochemistry to be applied to regulate the properties of the SAM. Fundamental to this diverse chemistry is the ability to regulate the transport of electrons through the molecular film [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

“…Variable valence metal cations (VVMCs) have shown to be highly promising for development of new sensors based on their catalytic or electrocatalytic effect in chemical reactions [28]. For example, application of Pb 2+ for oxidation of vitamin C [29], Cu 2+ for oxidation of L-cystein [30], H 2 Q [31] and butylated hydroxyanisole [32] have already been reported.…”

Section: Introductionmentioning

confidence: 99%

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Electrocatalytic determination of hydroquinone with Mn+ modified gold-5-amino-2-mercaptobenzimidazole self-assembled monolayer electrodes

Shervedani

Bagherzadeh

2009

JICS

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Application of immobilized metal cations on the topside of gold-5-amino-2-mercaptobenzimidazole self-assembled monolayer (Au-5A2MBI-M n+ SAM, M n+ :Cu 2+ or Ag + ) for electrocatalytic determination of hydroquinone (H 2 Q) is described by voltammetric method. Several parameters were investigated to evaluate the performance of the sensors. Calibration curves for H 2 Q concentrations were linear from 1.0 × 10 -5 to 4.0 × 10 -4 M (r = 0.998) for Au-5A2MBI, from 1.0 × 10 -5 to 6.0 × 10 -4 M (r = 0.998) for Au-5A2MBI-Cu 2+ , and from 2.0 × 10 -6 to 2.0 × 10 -5 M (r = 0.996) and 1.0 × 10 -4 to 1.0 × 10 -3 M (r = 0.991) for Au-5A2MBI-Ag + SAM modified electrode. The respective detection limits were found as 6.5 × 10 -6 , 4.6 × 10 -6 and 1.8 × 10 -7 M. Both Cu 2+ and Ag + ions were found to have a good electrocatalytic effect on the oxidation of H 2 Q; however, Ag + was a more effective catalyst and showed better sensitivity and lower detection limit than all other tested electrodes. Au-5A2MBI-Ag + SAM electrode was used as a suitable sensor for determination of H 2 Q in a radiolysis developing agent as real sample. The results obtained by using proposed sensor and that obtained by an ASTM reference method were in good agreement at the 95% confidence level.

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In Situ Synthesis of a Novel Quinone Imine Self‐Assembled Monolayer and Consideration of Its Reactivity with L‐Arginine

2012

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In situ functionalization of a 4‐aminothiophenol (4ATP) self‐assembled monolayer (SAM) on a Au electrode (4ATP/Au SAM) by the Michael addition reaction is considered. Under optimized conditions, the nucleophilic attack of the amino group of 4ATP/Au SAM to give an electrogenerated ortho‐quinone produced a novel electroactive SAM (ESAM). The ESAM could be oxidized to quinone‐imine SAM (QI SAM) for the covalent immobilization of L‐arginine monolayers. Cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and Fourier transform infrared (FTIR) spectroscopy are employed to characterize these systems.. The apparent heterogeneous rate constant (ksapp) for ESAM/Au and the rate constant (k′) of the pseudo‐first order Michael addition reaction of L‐arginine and ESAM/Au are calculated.

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Electrocatalytic activities of gold-5-amino-2-mercaptobenzimidazole-Mn+ self-assembled monolayer complexes (Mn+: Ag+, Cu2+) for hydroquinone oxidation investigated by CV and EIS

Cited by 18 publications

References 72 publications

Electrochemical Characterization of Gold 6‐Amino‐2‐mercaptobenzothiazole Self‐Assembled Monolayer for Dopamine Detection in Pharmaceutical Samples

Electrochemical Characterization of Gold 6‐Amino‐2‐mercaptobenzothiazole Self‐Assembled Monolayer for Dopamine Detection in Pharmaceutical Samples

Electrocatalytic determination of hydroquinone with Mn+ modified gold-5-amino-2-mercaptobenzimidazole self-assembled monolayer electrodes

In Situ Synthesis of a Novel Quinone Imine Self‐Assembled Monolayer and Consideration of Its Reactivity with L‐Arginine

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