CdTe Quantum Dots-Electrospun Nanofibers Assembly for Visual and Portable Detection of Cu2+

Abstract

[1] 本研究发展了一种基于静电纺丝纳米纤维和量子点的固相可视化检测环境水样中重金属离子的方法。 [2] 静电纺丝纳米纤维具有性能可控、易于功能化、检测方便、环境友好等优点。 [3] 由于静电纺丝纳米纤维为固相，为即时方法和测试条的开发提供了思路。 In this work, electrospun nanofibers (NFs) with good moisture-resistance were prepared by electrospinning technology, and further assembled with CdTe quantum dots (CdTe QDs). The results of scanning electron microscopy, transmission electron microscopy and confocal fluorescence microscopy showed that the CdTe QDs with strong fluorescence were uniformly assembled on the surface of electrospun NFs after the electrostatic adsorption for 90 min at pH 7.2. Under 365 nm excitation, the CdTe QDs-NFs assembly presented red fluorescence, which could be significantly quenched by copper ion (Cu 2+ ), and the fluorescence quenching degree of CdTe QDs-NFs assembly showed a good linear relationship with Cu 2+ concentration in the range of 0.08–800 μmol/L, and the detection limit was 11.1 nmol/L. This method had advantages of simplicity and high selectivity, and was successfully applied to the visualization and portable detection of Cu 2+ in environmental water samples. In this work, the CdTe quantum dots-nanofiber assembly with red fluorescence was obtained by electrostatic reaction. However, Cu 2+ was able to quench the red fluorescence with obvious color change from red to blue under 365 nm irradiation, which could realize the visualization and portable detection of Cu 2+ in environmental water samples.