Abstract: Odorant visualization based on fluorescence imaging has been developed as a novel technique to obtain spatiotemporal information on odors in an environment. In order to increase the selectivity and reversibility of sensing films, fluorescent-dyed micropowders with molecular imprinting ability were proposed for the odorant visualization. The micropowders were prepared by bulk polymerization in the presence of template and fluorescence probe molecules. The fluorescence emission character and the molecular imprinting effect of the prepared micropowders were investigated by fluorescence microscope observations and gas chromatography-mass spectrometry (GC/MS) measurements, respectively. The dyed molecular imprinted polymer (MIP) micropowders were coated on glass substrates and used as the sensing film for the selective visualization of odorant flows. The molecular imprinting effect was confirmed by the change in the ratio of the fluorescence of the MIP film to the non-imprinted polymer (NIP) film. In addition, a higher ratio was demonstrated by the MIP film on the target odorant than the non-target odorant, which verified the selective visualization of the prepared micropowder. The film also showed advantage in reversible response on various odorants; therefore the fluorescent MIP micropowder can be used repeatedly in the real time odorant visualizaiton.
Template and target information: hexanoic acid, HA
Author keywords: molecularly imprinted polymer, fluorescent micropowder, odorant visualization, selectivity, reversibility