Self-erasing and rewritable wettability patterns on ZnO thin films

Ville Kekkonen, Antti Hakola, Timo Kajava, Elina Sahramo, Jari Malm, Maarit Karppinen, Robin H.A. Ras

Research output: Contribution to journalArticleScientificpeer-review

24 Citations (Scopus)
22 Downloads (Pure)


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.
Original languageEnglish
Article number044102
Pages (from-to)1-3
Number of pages3
JournalApplied Physics Letters
Issue number4
Publication statusPublished - 2010
MoE publication typeA1 Journal article-refereed


  • lasers
  • photoinduced wetting


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