A Novel Room-Temperature Carbon Dioxide (CO₂) Gas Sensor Based on Tungsten Oxide (WO₃) Rods via Pulsed Laser Deposition

Abstract

Room temperature Carbon dioxide CO2 gas sensor was fabricated on Tungsten Oxide (WO3) nanorod thin film. Copper Oxide (CuO) nanostructure on quartz was used as substrate to grow WO3 nanorod by Pulsed Laser Deposition method . The role of CuO substrate on the grown shapes of WO3 films and enhanced sensing as well is discussed here. FESEM and XRD were used to characterize the films. WO3 nanorod-based gas sensor exhibits excellent RT Sensitivity (109 %) to CO2 gas at 105 ppm because of effective interaction of (WO3) film morphology with (CO2). The WO3 nanorod sensor showed remarkably enhanced response under gas flow conditions (23,62 and 105 ppm) due to availability of additional adsorption sites and oxygen vacancies. The sensor shows fast response with a response time of 3 s and a decay time of 1.7 s.