Investigation of long-term chemical stability of structured ZnO films in aqueous solutions of varying conditions

Saara Heinonen, Jukka-Pekka Nikkanen, Elina Huttunen-Saarivirta, Erkki Levänen

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)

Abstract

Nanostructured zinc oxide, ZnO, films feature attractive functional properties, but their long-term stability needs further investigation. Here, ZnO thin films with well-aligned rod-like structure were grown on stainless steel substrate. The long-term chemical stability of the ZnO films was investigated in solutions with varying pH values (3 - 11) to enhance knowledge about the durability of films in acidic and basic environments. The solubility and stability of the films in the solutions were investigated using atomic absorption spectrophotometry, scanning electron microscopy imaging and energy-dispersive X-ray spectroscopy analyses, as well as by monitoring changes in water contact angle of the films and in the pH values of the solutions. The ZnO film was found to be most stable at highest pH value, with the amount of dissolved zinc being lowest among the studied pH values and the changes observed with other characterization methods being minor compared to the samples immersed to other solutions. At the lowest pH, the film was removed rapidly from the substrate by dissolution. In solutions featuring pH values 5 and 9, the measured pH was unstable and changed constantly until it reached the value 7.2-7.6, i.e., until the equilibrium of different chemical species in the solution was achieved. These results are presented and discussed in this paper from the viewpoint of applicability of the ZnO films.
Original languageEnglish
Pages (from-to)410-419
Number of pages10
JournalThin Solid Films
Volume638
Issue numberSeptember
DOIs
Publication statusPublished - 30 Sep 2017
MoE publication typeA1 Journal article-refereed

Fingerprint

Chemical stability
aqueous solutions
Zinc Oxide
Stainless Steel
Spectrophotometry
Substrates
spectrophotometry
Zinc oxide
durability
zinc oxides
Oxide films
Contact angle
oxide films
Zinc
stainless steels
dissolving
Dissolution
Durability
rods
Stainless steel

Keywords

  • chemical stability
  • hydrothermal synthesis
  • pH
  • solubility
  • thin film
  • zinc oxide

Cite this

Heinonen, Saara ; Nikkanen, Jukka-Pekka ; Huttunen-Saarivirta, Elina ; Levänen, Erkki. / Investigation of long-term chemical stability of structured ZnO films in aqueous solutions of varying conditions. In: Thin Solid Films. 2017 ; Vol. 638, No. September. pp. 410-419.
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Investigation of long-term chemical stability of structured ZnO films in aqueous solutions of varying conditions. / Heinonen, Saara; Nikkanen, Jukka-Pekka; Huttunen-Saarivirta, Elina; Levänen, Erkki.

In: Thin Solid Films, Vol. 638, No. September, 30.09.2017, p. 410-419.

Research output: Contribution to journalArticleScientificpeer-review

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