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Synthesis and characterization of bromophenol blue encapsulated silica and silica-titania nanocomposites for detection of volatile organic vapors
Physica B: Condensed Matter ( IF 2.8 ) Pub Date : 2021-03-31 , DOI: 10.1016/j.physb.2021.413026
Adil Alshoaibi , Shumaila Islam

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.



中文翻译:

溴酚蓝包裹的二氧化硅和二氧化硅-二氧化钛纳米复合材料的合成与表征,用于检测挥发性有机蒸气

由于食品工业中的pH传感应用,通过溶胶-凝胶法合成了溴酚蓝固定化二氧化硅(BPB-S)和二氧化硅-二氧化钛(BPB-ST)纳米复合材料。基本分析证实,两种纳米基质都具有多孔表面,并且在≥400°C的条件下具有热稳定性。基于van逝波吸收的光纤pH传感器是通过涂覆BPB-S和BPB-ST纳米复合材料制备的。当the逝场与传感涂层相互作用时,吸收会由于pH值的变化而发生变化,并且输出强度会记录为传感器的响应。BPB-S和BPB-ST纳米复合材料的灵敏度分别计算为−136.65计数/ pH和-17.95计数/ pH。BPB-ST纳米基质的响应时间比BPB-S纳米复合物的响应时间0.8 s快0.2 s。鱼的 通过评估颜色相对于鱼类pH的变化,目测确定新鲜度。这些发现证实,合成的纳米复合材料具有检测pH值中挥发性有机蒸气的潜力。

更新日期:2021-04-08
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