College of Material Science and Engineering, North China University of Science and Technology, Key Laboratory of Functional Polymer Materials of Tangshan, Tangshan 063210, China.
College of Material Science and Engineering, North China University of Science and Technology, Key Laboratory of Functional Polymer Materials of Tangshan, Tangshan 063210, China.
Spectrochim Acta A Mol Biomol Spectrosc. 2019 Jan 15;207:173-182. doi: 10.1016/j.saa.2018.09.021. Epub 2018 Sep 11.
A fluorescent nanofibrous membrane (NFM) was successfully fabricated by functionalizing electrospun ethylene-vinyl alcohol copolymer (EVOH) NFM with 4‑aminobenzoic acid (PABA) and 1‑pyrenecarboxaldehyde (Py-CHO) for fast and selective determination of Cu in aqueous solution. The effective grafting of PABA and Py-CHO on the surface of EVOH NFM was confirmed by FTIR and XPS spectra. Benefiting from the integrated merits of electrospun EVOH NFM, PABA and Py-CHO, the as-appeared EVOH-PABA-Py NFM exhibited high sensitivity and selectivity towards Cu detection. The quenching efficiency was 91.7% when the concentration of Cu reached 5 × 10 M, while the detectable fluorescence response of the NFM was still observed when the concentration of Cu was 1 × 10 M. The fluorescence quenching caused by Cu was hardly affected by other commonly co-existent metal ions. More importantly, the fluorescent NFM exhibited fast response and high reversibility towards Cu detection. The "off-on" fluorescence switching process via alternating addition of Cu and NaEDTA occurred in 3 min, and the quenching efficiency of the NFM kept relatively stable values within 10 cycles. This work may provide a new insight into the development of rapid, portable, stable and reusable fluorescent sensor based on electrospun nanofibers that can satisfy the requirements of practical metal ions detection.
一种荧光纳米纤维膜（NFM）通过将 4-氨基苯甲酸（PABA）和 1-芘甲醛（Py-CHO）功能化到电纺乙烯-乙烯醇共聚物（EVOH）NFM 上成功制备，用于快速和选择性地测定水溶液中的 Cu。FTIR 和 XPS 光谱证实了 PABA 和 Py-CHO 在 EVOH NFM 表面的有效接枝。由于电纺 EVOH NFM、PABA 和 Py-CHO 的综合优点，所出现的 EVOH-PABA-Py NFM 对 Cu 检测表现出高灵敏度和选择性。当 Cu 的浓度达到 5×10-5 M 时，猝灭效率为 91.7%，而当 Cu 的浓度为 1×10-5 M 时，仍能观察到 NFM 的可检测荧光响应。Cu 引起的荧光猝灭几乎不受其他常见共存金属离子的影响。更重要的是，荧光 NFM 对 Cu 的检测具有快速响应和高可逆性。通过交替添加 Cu 和 NaEDTA 实现了“开-关”荧光开关过程，在 3 分钟内完成，并且在 10 个循环内 NFM 的猝灭效率保持相对稳定的值。这项工作可能为基于电纺纳米纤维的快速、便携、稳定和可重复使用的荧光传感器的开发提供新的思路，以满足实际金属离子检测的要求。
