Gas sensing using electrostatic force potentiometry

G. Koley; M. Qazi; L. Lakshmanan; T. Thundat

doi:10.1063/1.2731686

Gas sensing using electrostatic force potentiometry

G. Koley
, M. Qazi
, L. Lakshmanan
, T. Thundat

Department of Chemical and Biological Engineering

University at Buffalo

University of South Carolina

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

31 Scopus citations

Abstract

A highly sensitive potentiometric technique generally applicable for detection of gases utilizing adsorption-induced changes in surface work function is demonstrated. This technique is applied to sense hydrogen based on work function change of a Pt thin film. The surface work function changes of Pt upon exposure to pure and 1000 ppm hydrogen were found to be ∼900 and ∼270 mV, respectively. These work function changes are much higher than corresponding changes in the Schottky barrier height in Pt-semiconductor based amperometric sensor devices for similar hydrogen concentration. Using this technique, detection down to 8 ppm hydrogen concentration is demonstrated.

Original language	English
Article number	173105
Journal	Applied Physics Letters
Volume	90
Issue number	17
DOIs	https://doi.org/10.1063/1.2731686
State	Published - 2007

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title = "Gas sensing using electrostatic force potentiometry",

abstract = "A highly sensitive potentiometric technique generally applicable for detection of gases utilizing adsorption-induced changes in surface work function is demonstrated. This technique is applied to sense hydrogen based on work function change of a Pt thin film. The surface work function changes of Pt upon exposure to pure and 1000 ppm hydrogen were found to be ∼900 and ∼270 mV, respectively. These work function changes are much higher than corresponding changes in the Schottky barrier height in Pt-semiconductor based amperometric sensor devices for similar hydrogen concentration. Using this technique, detection down to 8 ppm hydrogen concentration is demonstrated.",

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AU - Lakshmanan, L.

AU - Thundat, T.

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AB - A highly sensitive potentiometric technique generally applicable for detection of gases utilizing adsorption-induced changes in surface work function is demonstrated. This technique is applied to sense hydrogen based on work function change of a Pt thin film. The surface work function changes of Pt upon exposure to pure and 1000 ppm hydrogen were found to be ∼900 and ∼270 mV, respectively. These work function changes are much higher than corresponding changes in the Schottky barrier height in Pt-semiconductor based amperometric sensor devices for similar hydrogen concentration. Using this technique, detection down to 8 ppm hydrogen concentration is demonstrated.

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JO - Applied Physics Letters

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Gas sensing using electrostatic force potentiometry

Abstract

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