Meniscus‐Guided Micro‐Printing of Prussian Blue for Smart Electrochromic Display.

Autor: Kim, Je Hyeong, Park, Seobin, Ahn, Jinhyuck, Pyo, Jaeyeon, Kim, Hayeol, Kim, Namhun, Jung, Im Doo, Seol, Seung Kwon
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Zdroj: Advanced Science; 1/25/2023, Vol. 10 Issue 3, p1-10, 10p
Abstrakt: Using energy‐saving electrochromic (EC) displays in smart devices for augmented reality makes cost‐effective, easily producible, and efficiently operable devices for specific applications possible. Prussian blue (PB) is a metal‐organic coordinated compound with unique EC properties that limit EC display applications due to the difficulty in PB micro‐patterning. This work presents a novel micro‐printing strategy for PB patterns using localized crystallization of FeFe(CN)6 on a substrate confined by the acidic‐ferric‐ferricyanide ink meniscus, followed by thermal reduction at 120 °C, thereby forming PB. Uniform PB patterns can be obtained by manipulating printing parameters, such as the concentration of FeCl3·K3Fe(CN)6, printing speed, and pipette inner diameter. Using a 0.1 M KCl (pH 4) electrolyte, the printed PB pattern is consistently and reversibly converted to Prussian white (CV potential range: −0.2–0.5 V) with 200 CV cycles. The PB‐based EC display with a navigation function integrated into a smart contact lens is able to display directions to a destination to a user by receiving GPS coordinates in real time. This facile method for forming PB micro‐patterns could be used for advanced EC displays and various functional devices. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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