Oxygen vacancy modulation of titania nanotubes by cathodic polarization and chemical reduction routes for efficient detection of volatile organic compounds
Teena Gakhar, Arnab Hazra
Abstract
nanotubes offered moderate response magnitudes of 75.4% and 80% at 150 °C and 200 °C under exposure to 100 ppm of ethanol, which was found to be the best among all the samples due to the appreciably fast response (155 s) and recovery time (779 s). The developed sensors showed adequate stability and selectivity towards ethanol with a moderate dynamic range (20 to 200 ppm of ethanol) of detection. A general relation was drawn based on the experimental findings of this work to estimate the response magnitude of nanoscale metal oxide gas sensors with various levels of oxygen vacancies.
Topics & Concepts
Materials scienceX-ray photoelectron spectroscopyNanotubeRaman spectroscopyAnataseTransmission electron microscopyOxygenAnalytical Chemistry (journal)Chemical engineeringNanotechnologyCarbon nanotubeChemistryOrganic chemistryPhotocatalysisOpticsCatalysisPhysicsEngineeringGas Sensing Nanomaterials and SensorsElectrochemical sensors and biosensorsAnalytical Chemistry and Sensors