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Chemical sensors using peptide-functionalized conducting polymer nanojunction arrays

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7 Author(s)
Aguilar, Alvaro Diaz ; Department of Electrical Engineering and The Center for Solid State Electronics Research, Arizona State University, Tempe, Arizona 85287 ; Forzani, Erica S. ; Li, Xiulan ; Nongjian Tao
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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.

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Applied Physics Letters  (Volume:87 ,  Issue: 19 )