잉크젯 프린팅이 가능한 공액고분자 센서시스템 연구

Abstract

Polydiacetylenes (PDAs), a family of conjugated polymers that have alternating ene-yne backbone structures, are exceptional in terms of their facile synthesis and stimulus responsive color and fluorescence changes. In this dissertation research, three types of inkjet printable PDA ink systems were developed for paper-based colorimetric and fluorometric sensor applications. Firstly, three-component microemulsion type ink systems were designed to allow generation of organic phase droplets in an aqueous solution with a homogeneous size distribution containing high concentrations of diacetylene (DA) monomers. Secondly, surfactant-assisted composite suspensions comprised of two-components were investigated to overcome inherent problems associated with organic solvents of the microemulsion systems. Lastly, inkjet-printable DA supramolecules, which can be dispersed in water without using additional surfactants, were developed. These three types of ink solutions containing DA monomers can be readily transferred to a paper substrate by utilizing a common office inkjet printer. UV irradiation of the DA-printed paper results in generation of blue-colored PDA images, which displays a typical chromic transition accompanied by the generation of fluorescence in response to environmental stimulus such as heat, organic solvents, pH and mechanical perturbations. It is believed that adaptation of the target PDA precursor to inkjet printing using common office inkjet printers will provide a new strategy for pattern-on-demand chromatic type displays and sensors in both the scientific investigations and daily life applications.