NO2 Gas Response of WO3 Nanofibers by Light and Thermal Activation. (2015)

• Record Type: Journal Article
• Authors: Giancaterini, L.; Emamjomeh, S.M.; De Marcellis, A.; Palange, E.; Cantalini, C.
• Is Part Of: Procedia engineering. Volume 120(2015)
• Page Start: 791
• Page End: 794
• Publication Date: 2015
• Subjects: Light activation -- WO3 -- Nano fibers -- Metal oxide -- NO2.; Engineering -- Congresses; Engineering -- Periodicals; Engineering; Conference proceedings; Periodicals; 620.005
• DOI: 10.1016/j.proeng.2015.08.824
• Languages: English
• ISSNs: 1877-7058

Abstract

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=670 nm, Green λ=550 nm, and Purple Blue λ=430 nm). 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.