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A room-temperature TiO2-nanotube hydrogen sensor able to self-clean photoactively from environmental contamination

Published online by Cambridge University Press:  03 March 2011

Gopal K. Mor ,
Maria A. Carvalho ,
Ooman K. Varghese ,
Michael V. Pishko  and
Craig A. Grimes
Gopal K. Mor
Affiliation:
Department of Electrical Engineering and Department of Materials Science and Engineering, 217 Materials Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802
Maria A. Carvalho
Affiliation:
Department of Chemical Engineering, 267 Materials Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802
Ooman K. Varghese
Affiliation:
Department of Electrical Engineering and Department of Materials Science and Engineering. 217 Materials Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802
Michael V. Pishko
Affiliation:
Department of Chemical Engineering, 267 Materials Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802
Craig A. Grimes*
Affiliation:
Department of Electrical Engineering and Department of Materials Science and Engineering, 217 Materials Research Laboratory, The Pensylvania State University, University Park, Pennsylvania 16802
*
a)Address all correspondence to this author. e-mail: cgrimes@engr.psu.edu
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Abstract

Described is a room-temperature hydrogen sensor comprised of a TiO2-nanotube array able to recover substantially from sensor poisoning through ultraviolet (UV) photocatalytic oxidation of the contaminating agent; in this case, various grades of motor oil. The TiO2 nanotubes comprising the sensor are a mixture of both anatase and rutile phases, having nominal dimensions of 22-nm inner diameter, 13.5-nm wall thickness, and 400-nm length, coated with a 10-nm-thick noncontinuous palladium layer. At 24 °C, in response to 1000 ppm of hydrogen, the sensors show a fully reversible change in electrical resistance of approximately 175,000%. Cyclic voltammograms using a 1 N KOH electrolyte under 170 mW/cm2 UV illumination show, for both a clean and an oil-contaminated sensor, anodic current densities of approximately 28 mA/cm2 at 2.5 V. The open circuit oxidation potential shows a shift from 0.5 V to −0.97 V upon UV illumination.

Keywords

Surface reactionCeramicChemical reactivity
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 2 , February 2004 , pp. 628 - 634
Copyright
Copyright © Materials Research Society 2004

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