Quantum dot/polyvinyl alcohol composite nanofibers membrane as highly sensitive fluorescence quenching-based sensors
作者： Matin Mahmoudifard , Ahmad Mousavi Shoushtari , Maryam Shanehsaz
DOI: 10.1007/S12221-014-1797-0
关键词:
摘要: Nanofibrous membranes are intensively applied to fabricate advanced intelligent devices like highly sensitive sensors due their flexibility, high porosity, surface area and good mechanical chemical stability. In this work, fluorescent cadmium telluride (CdTe) quantum dots (Q.Ds) were synthesized then uniformly embedded in poly vinyl alcohol (PVA) nanofibers by electrospinning technique serve as reversible quenching fluorescence-based sensor detect the traces of benzene, toluene xylene vapors selectively at room temperature. Fluorescence analysis suggested that Q.Ds preserve original property solid nanofiber if they solution. Scanning electron microscopy images showed uniform diameter nanofibers. addition, transmission (TEM) measurements confirmed distribution into structures. The main mechanism based was designated transfer from thiogalycolic acid (TGA) — capped Q.D target volatile organic compounds (VOC’s) vapors. Fabricated sensing upon trace different difference electronegativity various VOC’s molecules. For example exposure more withdrawing molecules induces severe effect on fluorescence intensity (about 25 %) over exposure. Moreover, it observed reducing enhanced sensitivity sensor.
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