Enhanced water vapor barrier properties for biopolymer films by polyelectrolyte multilayer and atomic layer deposited Al2O3 double-coating

Terhi Hirvikorpi, Mika Vähä-Nissi, Ali Harlin, Mikko Salomäki, Sami Areva, Juuso T. Korhonen, Maarit Karppinen

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Commercial polylactide (PLA) films are coated with a thin (20 nm) non-toxic polyelectrolyte multilayer (PEM) film made from sodium alginate and chitosan and additionally with a 25-nm thick atomic layer deposited (ALD) Al2O3 layer. The double-coating of PEM + Al2O3 is found to significantly enhance the water vapor barrier properties of the PLA film. The improvement is essentially larger compared with the case the PLA film being just coated with an ALD-grown Al2O3 layer. The enhanced water vapor barrier characteristics of the PEM + Al2O3 double-coated PLA films are attributed to the increased hydrophobicity of the surface of these films
Original languageEnglish
Pages (from-to)9451-9454
JournalApplied Surface Science
Issue number22
Publication statusPublished - 2011
MoE publication typeA1 Journal article-refereed



  • Aluminum oxide
  • atomic layer deposition
  • layer-by-layer deposition
  • polyelectrolyte
  • polylactide
  • water vapor barrier

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