Chemical sensors using peptide-functionalized conducting polymer nanojunction arrays

Alvaro Díaz Aguilar, Erica Forzani, Xiulan Li, Nongjian Tao, Larry A. Nagahara, Islamshah Amlani, Raymond Tsui

Research output: Contribution to journalArticlepeer-review

47 Scopus citations


We demonstrate a heavy metal-ion sensor for drinking water analysis using a conducting polymer nanojunction array. Each nanojunction is formed by bridging a pair of nanoelectrodes separated with a small gap (<60 nm) with electrodeposited peptide-modified polyanilines. The signal transduction mechanism of the sensor is based on the change in the nanojunction conductance as a result of polymer conformational changes induced by the metal-ion chelating peptide. The nanojunction sensor allows real-time detection of Cu2+ and Ni2+ at ppt range.

Original languageEnglish (US)
Article number193108
Pages (from-to)1-3
Number of pages3
JournalApplied Physics Letters
Issue number19
StatePublished - Nov 7 2005

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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