A Breath Ammonia Sensor Based on Conducting Polymer Nanojunctions

Alvaro Diaz Aguilar, Erica Forzani, Nongjian Tao, Larry A. Nagahara, Islamshah Amlani, Raymond Tsui

Research output: Contribution to journalArticle

38 Scopus citations

Abstract

We present an ammonia sensor for human breath analysis based on electrically conducting polymer nanojunctions. Each nanojunction is formed by bridging a pair of gold nanoelectrodes on a silicon chip separated by a small gap (<60 nm) with electrodeposited polyaniline. The signal transduction mechanism of the sensor is the change in the nanojunction conductance as a result of polymer dedoping by ammonia. The sensor response to human breath is validated by comparison with a reference method for detection of ammonium ion combined with an optimized breath ammonia trapping system. The nanojunction sensor is capable of in situ detection of parts per billion (ppb) levels of ammonia in human breath.

Original languageEnglish (US)
Pages (from-to)269-273
Number of pages5
JournalIEEE Sensors Journal
Volume8
Issue number3
DOIs
StatePublished - 2008

Keywords

  • Breath ammonia polyaniline
  • sensor

ASJC Scopus subject areas

  • Instrumentation
  • Electrical and Electronic Engineering

Fingerprint Dive into the research topics of 'A Breath Ammonia Sensor Based on Conducting Polymer Nanojunctions'. Together they form a unique fingerprint.

  • Cite this

    Aguilar, A. D., Forzani, E., Tao, N., Nagahara, L. A., Amlani, I., & Tsui, R. (2008). A Breath Ammonia Sensor Based on Conducting Polymer Nanojunctions. IEEE Sensors Journal, 8(3), 269-273. https://doi.org/10.1109/JSEN.2007.913137