Kabak Hacer Esra, Ertekin Kadriye, Ongun Merve Zeyrek, Denizalti Serpil
The Graduate School of Natural and Applied Sciences, Department of Chemistry, University of Dokuz Eylul, 35160, Buca, Izmir, Turkey.
Faculty of Sciences, Department of Chemistry, University of Dokuz Eylul, 35160, Buca, Izmir, Turkey.
J Fluoresc. 2019 May;29(3):549-567. doi: 10.1007/s10895-019-02367-3. Epub 2019 Mar 27.
Correct measurement of the pH in highly acidic environments is still a challenge. In such conditions most of the pH indicators suffer from instability in air or leaching from host matrices due to the solubility considerations. In this work, two different fluorescent probes were used along with silver nanoparticles (AgNPs) and ionic liquid (IL) in the polymeric matrices for sensing of the pH in harsh conditions. The pH sensitivities of the probes were tested after exposure to strong acid vapors by steady-state, lifetime based and kinetic mode measurements. The sensing materials were fabricated in form of thin films and electrospun nanofibers. The ionic liquid; 1-butyl-3-methylimidazolium tetrafluoroborate was exploited as additive to enhance the stability as well as response towards pH. Spectral changes were tested in a large scale; between pH 3.00-12.00. Utilization of the dyes in ethyl cellulose and polymethyl methacrylate along with AgNPs in form of electrospun fibers resulted in many advantages such as enhanced long term stability, sensitivity and improvement in all sensor dynamics. Sensing characteristics of the offered designs were tested after exposed to vapors of HCl, HSO and HNO, respectively.
在高酸性环境中准确测量pH值仍然是一项挑战。在这种条件下，由于溶解性问题，大多数pH指示剂在空气中不稳定或从主体基质中浸出。在这项工作中，两种不同的荧光探针与银纳米颗粒（AgNPs）和离子液体（IL）一起用于聚合物基质中，以检测苛刻条件下的pH值。通过稳态、基于寿命和动力学模式测量，测试了探针在暴露于强酸蒸汽后的pH敏感性。传感材料制成薄膜和电纺纳米纤维的形式。离子液体1-丁基-3-甲基咪唑四氟硼酸盐被用作添加剂，以提高稳定性以及对pH的响应。在pH 3.00 - 12.00的大范围测试了光谱变化。将染料用于乙基纤维素和聚甲基丙烯酸甲酯中，并与电纺纤维形式的AgNPs一起使用，具有许多优点，如增强的长期稳定性、灵敏度以及所有传感器动力学性能的改善。分别在暴露于HCl、HSO和HNO蒸汽后测试了所提供设计的传感特性。
