Switching "on and off" faradaic electrochemistry at an otherwise passivated electrode using gold-coated magnetic nanoparticles

被引：5

作者：

Carter, Lachlan

Chuah, Kyloon

Tavallaie, Roya

Barfidokht, Abbas

Parker, Stephen G.

Gooding, J. Justin ^{[1
]}

机构：

[1] Univ New S Wales, Australian Ctr NanoMed, Sch Chem, Sydney, NSW 2052, Australia

来源：

ELECTROCHEMISTRY COMMUNICATIONS | 2015年 / 61卷

关键词：

Gold-coated magnetic nanoparticles; Self assembled monolayers; Electrochemistry; SELF-ASSEMBLED MONOLAYERS; CHARGE-TRANSFER; METAL; SURFACES; FILM;

D O I：

10.1016/j.elecom.2015.10.012

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Herein we combined the use of self-assembled monolayer (SAM) modified electrodes and gold coated magnetic nanoparticles (Au@MNPs) to modulate faradaic electrochemistry when nanoparticles are absorbed on and removed from, a passivated electrode using an external magnetic field. Substantial faradaic electrochemistry of potassium ferricyanide in solution is first prevented by modifying gold electrodes with 11-mercaptoundecanoic acid to form a passivating SAM. Restoration of the faradaic electrochemistry is then achieved by introducing Au@MNPs which are brought to the surface using an external magnetic field. The faradaic electrochemistry can again be suppressed by removing Au@MNPs from the SAM using another external magnetic field. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：93 / 96

页数：4

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