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首页> 外文期刊>Materials science & engineering >Development of novel optical pH sensors based on coumarin 6 and nile blue A encapsulated in resin particles and specific support materials
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Development of novel optical pH sensors based on coumarin 6 and nile blue A encapsulated in resin particles and specific support materials

机译:基于香豆素6和尼罗蓝A的新型光学pH传感器的开发,该传感器封装在树脂颗粒和特定的支撑材料中

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摘要

Inspired by traditional pH papers, two types of ratiometric fluorescent pH sensors for neutral and alkaline pH ranges were developed in this study by using two fluorescent dyes, coumarin 6 (C6) and nile blue A (NB). These dyes were encapsulated into melamine-formaldehyde (ME) resin particles, which were then incorporated with polymer Nafion (NO or polyurethane hydrogel (PU) to prepare pH-sensing membranes. MF-C6 particles immobilized into polymer Nafion (i.e., MF-C6-Nf membrane) showed a dynamic ratiometric pH detection range of 4.5-7.5 through shift in fluorescence emission spectra at acidic and neutral pH solutions, as well as distinct color transition under normal visual sense from pink to yellow color. By contrast, MF-NB particles immobilized into polyurethane hydrogel (i.e., ME-NB-PU membrane) displayed a dynamic ratiometric fluorescence detection range of pH 9 - pH 12 via change in ratiometric fluorescence intensity at two emission band edges. The membrane also showed a clear change from blue to purple color under sunlight at high pH values. These pH-sensing membranes also exhibited high sensitivity, good reversibility, and stability. They were then applied to measure pH values in real urine samples and fermentation media.
机译:受传统pH纸的启发,通过使用两种荧光染料香豆素6(C6)和尼罗蓝A(NB)开发了两种用于中性和碱性pH范围的比例式荧光pH传感器。这些染料被封装在三聚氰胺-甲醛(ME)树脂颗粒中,然后与聚合物Nafion(NO或聚氨酯水凝胶(PU))结合制成pH敏感膜。MF-C6颗粒固定在聚合物Nafion(即MF-C6 -Nf膜)在酸性和中性pH溶液中的荧光发射光谱发生变化,动态比例pH检测范围为4.5-7.5,并且在正常视觉下从粉色到黄色具有明显的颜色过渡。固定在聚氨酯水凝胶(即ME-NB-PU膜)中的颗粒通过改变两个发射带边缘处的荧光强度比值,动态显示了pH 9-pH 12的荧光荧光比值检测膜,并且膜也显示出从蓝色到蓝色的明显变化。在高pH值的阳光下呈紫色,这些pH敏感膜还具有高灵敏度,良好的可逆性和稳定性,然后用于实际尿液中的pH值测量样品和发酵培养基。

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