Electrochemistry of polystyrene intercalated vertically aligned single- and double-walled carbon nanotubes on gold electrodes

Katherine Moore, Benjamin Flavel, Cameron Shearer, Amanda Ellis, Joseph Shapter

    Research output: Contribution to journalArticlepeer-review

    8 Citations (Scopus)

    Abstract

    Electrochemical electrodes incorporating double- and single-walled carbon nanotubes (CNTs) were fabricated on cysteamine modified flat gold substrates. Through covalent coupling of the amine end groups with carboxyl functionalized CNTs, a dense forest of vertically aligned CNTs was produced. To these a 30 nm thick insulating polystyrene layer was spin coated, resulting in exposure of the uppermost carbon nanotube ends. The electrochemical performance of each electrode was then determined using the redox probe ruthenium hexaamine. Once surrounded by polymer, the double-walled CNTs (DWCNTs) showed an improved electron transfer rate, compared to the single-walled electrode. This improvement was attributed to the protection of the electronic properties of the inner wall of the DWCNT during the chemical modification and suggests that DWCNTs may offer a useful alternative to SWCNTs in future electrochemical sensors and biosensors.

    Original languageEnglish
    Pages (from-to)1190-1193
    Number of pages4
    JournalElectrochemistry Communications
    Volume13
    Issue number11
    DOIs
    Publication statusPublished - Nov 2011

    Keywords

    • Cyclic volammetry
    • Double-walled carbon nanotubes
    • Gold electrode
    • Keywords

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