Structural, Morphological, and Optical Properties of Ag‐Doped TiO2Thin‐Film over Fiber Optic Substrate for Sensing Applications

Ag‐doped TiO 2 ( r Ag/Ti, r 1−3 = 2, 4, 6 wt%) is synthesized by a hydrothermal technique. Different characterizations, that is, X‐ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) analysis, photoluminescence (PL) spectra analysis, X‐ray photoelectron spectroscopy (XPS), field emission scanning electron microscope (FESEM), energy dispersive X‐ray analysis (EDX), and Brunauer–Emmett–Teller (BET) analysis, are conducted to study the utility of the developed thin‐film material as a sensing medium over the fiber substrate. The as‐prepared material is hydrothermally deposited over the optical fiber to construct a fiber optic sensing probe. The optical properties of TiO 2 are simulated theoretically by MATLAB simulation that reveals that optical absorption appears at the wavelength of 763 nm. The initial performance of the r Ag/Ti‐based optical fiber is investigated with the amine group in the range of 500−1500 ppm and a satisfactory response is found toward ethylenediamine (EDA) analytes with average sensitivity ( S av , in %) as 41.81 at 1200 ppm.