양친성기를 갖는 다이아세틸렌 초분자체를 이용한 전기영동증착법

Abstract

We describe the results of electrophoretic deposition characteristics of a conjugated polymer, polydiacetylene (PDA), that lead us to obtain film forming behavior, an unusual polymerization, pattern transfer, and fluorescence based thermo/mechano-responsive features of the deposited layer. The electric field applied in a two electrode system promotes the oriented motion of diacetylene (DA) supramolecules in aqueous solution in a direction that is determined by the charge polarities of tailorable pendant groups on the DA monomers. Through this mechanism, electrophoretic deposition of DA supramolecules on a conductive layer takes place to yield vesicular clustered aggregates with continuous leaf-like morphologies. In addition, unusual conformational changes of the DA monomers during the deposition result in the formation of polymerized blue colored PDAs on the working electrode. Based on these properties, selective deposition of the supramolecules on pre-patterned templates and consequent pattern transfer to a flexible substrate can be utilized to fabricate PDA-based microarray sensors. The chromatic change of the vesicles upon mechanical stress during pattern transfer is found to be peculiar to side groups of DA monomers. Owing to inherent non-fluorescence to fluorescence transition feature of PDA supramolecules that occurs in response to thermal perturbations, electrophoretically deposited PDA vesicles are employed to monitor the temperature of a heat dispensing micro-heater device.