Abstract
Aim of this paper is to compare the electrical responses to sub-ppm NO2 gas concentrations of WO3 electrospun nanofibers both activated by thermal (in the temperature range 25°C - 150°C) and/or light-radiating conditions (Red λ=670nm, Green λ=550nm, and Purple Blue λ=430nm). Blue light resulted the most effective light source with respect to the others. Light illumination at room temperature improves the base line recovery and response time, whereas temperature enhances relative response, with a maximum at 75°C. Light-radiating room temperature gas detection yields a satisfactory response despite the reduction of sensor gas sensitivity. Light induced electrical response mechanisms are presented and discussed.
Published Version
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