Highly sensitive CO2 sensor based on microrods-like La2O3 thin film electrode

Abstract

In this paper, microrods-like La₂O₃ thin films are successfully prepared by a chemical bath deposition method. The structural, morphological, wettability and compositional properties of La₂O₃ thin films are studied using X-ray diffraction (XRD), Fourier transform Raman (FT-Raman) spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET) and X-ray photo-electron spectrum (XPS) techniques. The La₂O₃ thin film shows highest selectivity 48% toward CO₂ gas as compared to other gases with response and recovery time periods of 50 and 73 s, respectively at a concentration of 350 ppm.