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Abstract

ABSTRACT

Studies on fake gasoline sensors based on nanofibers

Lee, Jung Dept. of Chemical Engineering The Graduate School Hanyang University

In this research, we have developed a selective and sensitive colorimetric sensor based on PDA conjugated polymer and electrospinning technique. Polymer nano/micro fibers encapsulated with polydiacetylene (PDA) supramolecules are readily prepared by using electrospinning. Randomly distributes diacetylene monomers were found to self-assembled during fiber formation and enable generation of blue-colored PDA containing polymer fibers upon UV-irradiation. The unique property of nano structured PDAs that leads to their application as sensing elements is the occurrence of color (blue-to-red) and fluorescence (non-to-red) change that takes place in response to a variety of environmental perturbations such as heat, pH, solvent, and molecular recognition. The fake gasoline induced a blue-to-red in color transition PDA-embedded electrospun fiber mats. Interestingly, PS electrospun fiber mats encapsulating PDA displays a blue-red color change when it exposed to toluene as a constituent of fake gasoline. We have found that, PDA-embedded fibers obtained from PS can be detected fake gasoline composed of up to 20% toluene. In addition, fake gasoline containing methanol promotes blue-to-red color transition of PDA-embedded PAA fiber mats. The fake gasoline composition dependent color change seen in PDA-embedded polymer mats allows for the development of an elegant and unique colorimetric fake gasoline sensor.