[논문]Redox-Active Self-Assembled Monolayer on Au ultramicroelectrode and its Electrocatalytic Detection of p-aminophenol Oxidation

Kim, Yun Jee; Kim, Ki Jun; Jung, Seung Yeon; Hwang, You Jin; Kwon, Seong Jung

doi:10.5229/jecst.2019.10.2.170

[국내논문] Redox-Active Self-Assembled Monolayer on Au ultramicroelectrode and its Electrocatalytic Detection of p-aminophenol Oxidation 원문보기

Journal of electrochemical science and technology, v.10 no.2, 2019년, pp.170 - 176

Kim, Yun Jee (Department of Chemistry, Konkuk University) , Kim, Ki Jun (Department of Chemistry, Konkuk University) , Jung, Seung Yeon (Department of Chemistry, Konkuk University) , Hwang, You Jin (Department of Chemistry, Konkuk University) , Kwon, Seong Jung (Department of Chemistry, Konkuk University)

Abstract ▼ AI-Helper

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.

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표/그림 (6)

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

Therefore, in this paper, we introduce SAMs and Fc modification on an Au UME and investigate the electron transfer mediation of redox-active SAMs on the UME. The electrocatalytic current produced by pAP oxidation at SAMs and Fc modified Au UME was measured via cyclic voltammetry (CV), and the results are compared with that obtained at millimeter-sized Au electrode modified with the same SAMs and Fc.

대상 데이터

Ultrapure water (> 18 MΩ, Millipore) was used in all experiments.
The electrochemical experiment was performed using a CHI model 660 potentiostat (CH Instruments, Austin, TX) with the three electrode cell placed in a Faraday cage. The electrochemical cell comprised a SAMs modified working electrode, a Pt wire counterelectrode, and an Ag/AgCl reference electrode or mercury-mercuric sulfate reference electrode.
The electrochemical experiment was performed using a CHI model 660 potentiostat (CH Instruments, Austin, TX) with the three electrode cell placed in a Faraday cage. The electrochemical cell comprised a SAMs modified working electrode, a Pt wire counterelectrode, and an Ag/AgCl reference electrode or mercury-mercuric sulfate reference electrode. The electrolyte solution with p-AP was prepared daily.
Amine-terminated G4 poly(amidoamine) (PAMAM) dendrimer, ferrocenecarboxaldehyde, 11- ferrocenyl-1-undecanethiol (11-Fc-thiol), 1-ethyl-3-[3-(dimethylamino)propyl]carbodiimide hydrochloride (EDC), N-hydroxysuccinimde (NHS), sodium borohydride, p-AP, 12-mercaptododecanoic acid (MDA), and 11-mercapto-1-undecanol (MUO) were purchased from Sigma-Aldrich. All buffer salts and other inorganic chemicals were also obtained from Sigma-Aldrich.

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