A room-temperature TiO2-nanotube hydrogen sensor able to self-clean photoactively from environmental contamination
作者： Gopal K. Mor , Maria A. Carvalho , Ooman K. Varghese , Michael V. Pishko , Craig A. Grimes
DOI: 10.1557/JMR.2004.19.2.628
关键词:
摘要: Described is a room-temperature hydrogen sensor comprised of TiO2-nanotube array able to recover substantially from poisoning through ultraviolet (UV) photocatalytic oxidation the contaminating agent; in this case, various grades motor oil. The TiO2 nanotubes comprising are mixture both anatase and rutile phases, having nominal dimensions 22-nm inner diameter, 13.5-nm wall thickness, 400-nm length, coated with 10-nm-thick noncontinuous palladium layer. At 24 °C, response 1000 ppm hydrogen, sensors show fully reversible change electrical resistance approximately 175,000%. Cyclic voltammograms using 1 N KOH electrolyte under 170 mW/cm2 UV illumination show, for clean an oil-contaminated sensor, anodic current densities 28 mA/cm2 at 2.5 V. open circuit potential shows shift 0.5 V −0.97 upon illumination.
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