Increased redox-active peptide loading on carbon nanotube electrodes

Katherine Moore; Benjamin Flavel; Jingxian Yu; Andrew Abell; Joseph Shapter

doi:10.1016/j.electacta.2012.10.108

Increased redox-active peptide loading on carbon nanotube electrodes

Katherine Moore, Benjamin Flavel, Jingxian Yu, Andrew Abell, Joseph Shapter

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

Abstract

Carbon nanotube (CNT) electrodes for electrochemistry were fabricated from single- and double-walled carbon nanotubes. The electrodes were subsequently covalently loaded with a ferrocene modified α-aminoisobutyric acid peptide, and the electron transfer (ET) capabilities were probed with cyclic voltammetry. The CNT electrodes comprised of double walled CNTs (DWCNTs) demonstrated significantly higher peak current compared to their single walled counterparts (SWCNTs). This is attributed to a higher loading of the ferrocene modified peptide to the outer wall of the nanotube, through the presence of a larger number of defects sites within the sp² carbon lattice for the DWCNTs. This higher loading was achieved without compromising the ET rate, indicating that DWCNTs may offer a useful alternative to SWCNTs in future electrochemical sensors and biosensors.

Original language	English
Pages (from-to)	206-211
Number of pages	6
Journal	Electrochimica Acta
Volume	89
DOIs	https://doi.org/10.1016/j.electacta.2012.10.108
Publication status	Published - 1 Feb 2013

Keywords

Double walled carbon nanotubes
Ferrocene modified peptide
Redox probe loading

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10.1016/j.electacta.2012.10.108

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title = "Increased redox-active peptide loading on carbon nanotube electrodes",

abstract = "Carbon nanotube (CNT) electrodes for electrochemistry were fabricated from single- and double-walled carbon nanotubes. The electrodes were subsequently covalently loaded with a ferrocene modified α-aminoisobutyric acid peptide, and the electron transfer (ET) capabilities were probed with cyclic voltammetry. The CNT electrodes comprised of double walled CNTs (DWCNTs) demonstrated significantly higher peak current compared to their single walled counterparts (SWCNTs). This is attributed to a higher loading of the ferrocene modified peptide to the outer wall of the nanotube, through the presence of a larger number of defects sites within the sp2 carbon lattice for the DWCNTs. This higher loading was achieved without compromising the ET rate, indicating that DWCNTs may offer a useful alternative to SWCNTs in future electrochemical sensors and biosensors.",

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AU - Moore, Katherine

AU - Flavel, Benjamin

AU - Yu, Jingxian

AU - Abell, Andrew

AU - Shapter, Joseph

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AB - Carbon nanotube (CNT) electrodes for electrochemistry were fabricated from single- and double-walled carbon nanotubes. The electrodes were subsequently covalently loaded with a ferrocene modified α-aminoisobutyric acid peptide, and the electron transfer (ET) capabilities were probed with cyclic voltammetry. The CNT electrodes comprised of double walled CNTs (DWCNTs) demonstrated significantly higher peak current compared to their single walled counterparts (SWCNTs). This is attributed to a higher loading of the ferrocene modified peptide to the outer wall of the nanotube, through the presence of a larger number of defects sites within the sp2 carbon lattice for the DWCNTs. This higher loading was achieved without compromising the ET rate, indicating that DWCNTs may offer a useful alternative to SWCNTs in future electrochemical sensors and biosensors.

KW - Double walled carbon nanotubes

KW - Ferrocene modified peptide

KW - Redox probe loading

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JF - Electrochimica Acta

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Increased redox-active peptide loading on carbon nanotube electrodes

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