Beschreibung:
A Plastic PMMA optical fiber with a small portion of the clad being replaced by Gadolinium (Gd) doped CeO 2 sensing material has been proposed in this work for toxic gas sensing. Using powder diffraction X-Ray analysis (XRD), the structural characterisation of the as synthesized Gadolinium doped CeO 2 was first determined, and it was discovered to have a cubic fluorite structure. For different concentrations of VOC trial gases such as ammonia, methanol, and ethanol (0-500 parts per mole), the spectrum properties of the Gadolinium doped CeO 2 coated PMMA fiber optic gas sensor were investigated. Gadolinium doped CeO 2 had the highest intensity of variation towards ammonia gas at wavelengths of 690, 771, and 949 nm, indicating that it had superior sensitivity, descent response and recovery rate at room temperature than other two gases. The number of oxygen species present on the surface after adsorption was found to be responsible for the enhanced sensitivity of Gadolinium doped CeO 2 towards the VOC gases