Abstract
Owing to pH sensing applications in the food industry, bromophenol blue immobilized silica (BPB–S) and silica-titania (BPB-ST) nanocomposites are synthesized by the sol-gel route. Fundamental analysis confirms that both nanomatrices have porous surface and thermal stability at ≥ 400 °C. Evanescent wave absorption-based fiber optic pH sensors are prepared by coating of BPB-S and BPB-ST nanocomposites. when the evanescent field interacts with the sensing coating, absorption varied due to pH change and the output intensity is recorded as a sensor response. The sensitivity of the BPB-S and BPB-ST nanocomposite is calculated as −136.65 counts/pH and - 17.95 counts/pH, respectively. The BPB-ST nano-matrix exhibited a fast response 0.2 s than BPB-S nanocomposite response 0.8 s. The fish's freshness is determined visually by assessing the change in the color against the fish pH. The findings confirm that synthesized nanocomposites have the potential to detect volatile organic vapors in terms of pH.
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