A Breath Ammonia Sensor Based on Conducting Polymer Nanojunctions

Alvaro Diaz Aguilar; Erica S. Forzani; N. J. Tao; Larry A. Nagahara; Islamshah Amlani; Raymond Tsui

doi:10.1109/JSEN.2007.913137

A Breath Ammonia Sensor Based on Conducting Polymer Nanojunctions

Alvaro Diaz Aguilar, Erica S. Forzani, N. J. Tao, Larry A. Nagahara, Islamshah Amlani, Raymond Tsui

Research output: Contribution to journal › Article › peer-review

49 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 language	English (US)
Pages (from-to)	269-273
Number of pages	5
Journal	IEEE Sensors Journal
Volume	8
Issue number	3
DOIs	https://doi.org/10.1109/JSEN.2007.913137
State	Published - Mar 2008

Keywords

Breath ammonia polyaniline
sensor

ASJC Scopus subject areas

Instrumentation
Electrical and Electronic Engineering

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10.1109/JSEN.2007.913137

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title = "A Breath Ammonia Sensor Based on Conducting Polymer Nanojunctions",

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.",

keywords = "Breath ammonia polyaniline, sensor",

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AU - Tao, N. J.

AU - Nagahara, Larry A.

AU - Amlani, Islamshah

AU - Tsui, Raymond

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AB - 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.

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A Breath Ammonia Sensor Based on Conducting Polymer Nanojunctions

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Keywords

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