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Paper-based thermochromic displays

Mary Chuong (Sogang University, graduate school)

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The use of paper as a flexible substrate to fabricate paper electronics become more attractive for flexible printing electronics since paper is low-cost, printable, flexible, biodegradable, disposable and recyclable. This study describes a paper-based thermochromic display that can be fabricated by ...
The use of paper as a flexible substrate to fabricate paper electronics become more attractive for flexible printing electronics since paper is low-cost, printable, flexible, biodegradable, disposable and recyclable. This study describes a paper-based thermochromic display that can be fabricated by combining both a group of micro-electric heaters with a conductive silver-nanoparticle (AgNP) ink and microfilm of thermochromic (TC) polymer. AgNPs are metal nanoparticle providing a high conductive film, especially on the paper substrate. TC is smart material with a temperature response color-changing feature. The AgNP conductive patterns were printed on photo paper by ball-point pen charged with an AgNP ink, while a thin and uniform thermochromic film was printed on the top of the pattern by the screen-printing technique. As the electrical current is applied, the patterns conduct and radiate heat toward the top-coated TC ink. A colorimetric response of TC ink was activated by the thermal stimuli via an underneath heater. The results show that TC ink changes its color depending on the applied currents (or voltages, vice versa). Increasing voltage leads to a speed of change of color. The structure change and colorimetric properties of TC dye were observed by using FTIR spectroscopy and UV-visible spectroscopy respectively. The stability of microcapsules of TC ink was investigated by using SEM. Based on good performances of electrical heater and color change of TC dye, the paper-based Mondrian display was fabricated successfully showing a color change in high contrast.