Journal of Electrochemical Science and Technology

The Korean Electrochemical Society (한국전기화학회)
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Redox-Active Self-Assembled Monolayer on Au ultramicroelectrode and its Electrocatalytic Detection of p-aminophenol Oxidation

  • Received : 2018.09.21
  • Accepted : 2018.11.10
  • Published : 2019.06.30
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Abstract

Alkanethiol self-assembled monolayers (SAMs) and partially ferrocene (Fc) modifications were applied to the Au ultramicroelectrode (UME) rather than to standard sized electrodes with dimension of millimeters. The electron transfer mediation of the SAMs and Fc modified Au UME was investigated by using a p-aminophenol (p-AP) oxidation reaction via cyclic voltammetry. The electrocatalytic p-AP oxidation at the SAMs and Fc modified Au UME showed a much larger electrocatalytic current density than that at the standard sized electrode due to the fast mass transfer rate at the UME.

Keywords

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Scheme 1. Schematic illustration of the formation of mixed SAMs and immobilization of Fc-D on Au electrodes.

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Fig. 1. Cyclic voltammograms of (a) SAMs and Fc-D-modified Au UME (10 μm diameter) or (b) Au electrode (4.5 mm diameter) and (c) 11-Fc-thiol mixed SAMs modified Au UME (10 μm diameter) or (d) Au electrode (4.5 mm diameter), by varying the scan rate from 50 to 500 mV/s in electrolyte solution. (Inset box) Plot of anodic peak currents vs. potential sweep rates.

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Fig. 2. Cyclic voltammograms of (a) Fc-D modified Au UME and (b) Fc-D modified Au electrode in electrolyte solution with (red)/without (black) 0.5 mM p-AP. Scan rate was 50 mV/s.

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Fig. 3. Cyclic voltammograms of (a) Fc-D modified Au UME and (b) Fc-D modified Au electrode in electrolyte solution containing various concentrations of p-AP. Scan rate was 50 mV/s.

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Fig. 4. Calibration plot corresponding to change (a) in anodic limiting current for Fc-D modified Au UME and (b) in anodic peak current for Fc-D modified Au electrode upon different concentration of p-AP. The detecting limit (dashed line) was determined by multiplying the standard deviation of zero concentration results by 3.

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Fig. 5. Cyclic voltammogram of SAMs and Fc-D modifiedAu UME in electrolyte solution containing 0.5 mM of p-AP by varying the scan rate from 50 to 500 mV/s.

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