Self-erasing and rewritable wettability patterns on ZnO thin films

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Journal Title
Journal ISSN
Volume Title
School of Chemical Technology | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2010
Major/Subject
Mcode
Degree programme
Language
en
Pages
044102/1-3
Series
Applied Physics Letters, Volume 97, Issue 4
Abstract
Self-erasing patterns allow a substrate to be patterned multiple times or could store temporary information for secret communications, and are mostly based on photochromic molecules to change the color of the pattern. Herein we demonstrate self-erasing patterns of wettability on thin ZnO films made by atomic layer deposition. Hydrophilic patterns are written using UV light and decay spontaneously, i.e. become hydrophobic, or are erased aided by vacuum conditions or heat. We demonstrate that these patterns can be applied for channels to confine flow of water without physical walls.
Description
Keywords
zinc oxide, thin films, photoinduced wetting, lasers, II-VI semiconductors
Other note
Citation
Kekkonen, Ville & Hakola, Antti & Kajava, Timo & Sahramo, Elina & Malm, Jari & Karppinen, Maarit & Ras, Robin H. A.. 2010. Self-erasing and rewritable wettability patterns on ZnO thin films. Applied Physics Letters. Volume 97, Issue 4. 044102/1-3. ISSN 0003-6951 (printed). DOI: 10.1063/1.3460915.