Ultra-sensitive and wide-dynamic-range sensors based on dense arrays of carbon nanotube tips

Gengzhi Sun, Yinxi Huang, Lianxi Zheng*, Zhaoyao Zhan, Yani Zhang, John H.L. Pang, Tao Wu, Peng Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

Electrochemical electrodes based on dense and vertically aligned arrays of multi-walled carbon nanotubes (MWCNTs) were produced. The open tips of individual hollow nanotubes are exposed as active sites while the entangled nanotube stems encapsulated in epoxy collectively provide multiplexed and highly conductive pathways for charge transport. This unique structure together with the extraordinary electrical and electrochemical properties of MWCNTs offers a high signal-to-noise ratio (thus high sensitivity) and a large detection range, compared with other carbon-based electrodes. Our electrodes can detect K 3FeCN 6 and dopamine at concentrations as low as 5 nM and 10 nM, respectively, and are responsive in a large dynamic range that spans almost 5 orders of magnitude.

Original languageEnglish (US)
Pages (from-to)4854-4858
Number of pages5
JournalNanoscale
Volume3
Issue number11
DOIs
StatePublished - Nov 1 2011

ASJC Scopus subject areas

  • Materials Science(all)

Fingerprint

Dive into the research topics of 'Ultra-sensitive and wide-dynamic-range sensors based on dense arrays of carbon nanotube tips'. Together they form a unique fingerprint.

Cite this