Photocatalytic activity of atomic layer deposited TiO2 coatings on austenitic stainless steels and copper alloys

H. Kawakami, Risto Ilola (Corresponding Author), Ladislav Straka, Suvi Papula, Jyrki Romu, Hannu Hänninen, Riitta Mahlberg, M. Heikkilä

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Abstract

Photocatalytic activity of TiO2 -coated austenitic stainless steel (AISI 304) and copper alloys [deoxidized high phosphorus (DHP) copper and Nordic Gold] was studied by means of decomposition of methylene blue model waste water and open-circuit electrochemical potential measurements, and the photoinduced hydrophilicity was studied by means of contact angle measurements of water under ultraviolet irradiation. The TiO2 coatings were prepared by an atomic layer deposition technique from TiCl4 and H2O . The thicknesses of the prepared coatings were 5, 10, 50, 100, 150, and 200 nm . Morphology and crystal structure of the TiO2 coatings were studied using scanning electron microscope and X-ray diffraction techniques. Photocatalytic activity of the studied coatings was low with a coating thickness of 5 and 10 nm . When the coating thickness was 50 nm or higher for AISI 304 stainless steel, and 100 nm or higher for DHP and Nordic Gold copper alloys, the photoactivity was good, but no saturation or systematic effect of coating thickness or surface finish was observed. The photoinduced hydrophilicity was good with all studied coating thicknesses (50, 100, 150, and 200 nm ), with some exceptions.
Original languageEnglish
Pages (from-to)C62 - C68
Number of pages7
JournalJournal of the Electrochemical Society
Volume155
Issue number2
DOIs
Publication statusPublished - 2008
MoE publication typeA1 Journal article-refereed

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Copper alloys
Alloy steel
Austenitic stainless steel
Coatings
Hydrophilicity
Phosphorus
Gold alloys
Atomic layer deposition
Methylene Blue
Stainless Steel
Angle measurement
Gold
Contact angle
Copper
Wastewater
Electron microscopes
Stainless steel
Crystal structure
Irradiation
Decomposition

Cite this

Kawakami, H., Ilola, R., Straka, L., Papula, S., Romu, J., Hänninen, H., ... Heikkilä, M. (2008). Photocatalytic activity of atomic layer deposited TiO2 coatings on austenitic stainless steels and copper alloys. Journal of the Electrochemical Society, 155(2), C62 - C68. https://doi.org/10.1149/1.2815484
Kawakami, H. ; Ilola, Risto ; Straka, Ladislav ; Papula, Suvi ; Romu, Jyrki ; Hänninen, Hannu ; Mahlberg, Riitta ; Heikkilä, M. / Photocatalytic activity of atomic layer deposited TiO2 coatings on austenitic stainless steels and copper alloys. In: Journal of the Electrochemical Society. 2008 ; Vol. 155, No. 2. pp. C62 - C68.
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abstract = "Photocatalytic activity of TiO2 -coated austenitic stainless steel (AISI 304) and copper alloys [deoxidized high phosphorus (DHP) copper and Nordic Gold] was studied by means of decomposition of methylene blue model waste water and open-circuit electrochemical potential measurements, and the photoinduced hydrophilicity was studied by means of contact angle measurements of water under ultraviolet irradiation. The TiO2 coatings were prepared by an atomic layer deposition technique from TiCl4 and H2O . The thicknesses of the prepared coatings were 5, 10, 50, 100, 150, and 200 nm . Morphology and crystal structure of the TiO2 coatings were studied using scanning electron microscope and X-ray diffraction techniques. Photocatalytic activity of the studied coatings was low with a coating thickness of 5 and 10 nm . When the coating thickness was 50 nm or higher for AISI 304 stainless steel, and 100 nm or higher for DHP and Nordic Gold copper alloys, the photoactivity was good, but no saturation or systematic effect of coating thickness or surface finish was observed. The photoinduced hydrophilicity was good with all studied coating thicknesses (50, 100, 150, and 200 nm ), with some exceptions.",
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Photocatalytic activity of atomic layer deposited TiO2 coatings on austenitic stainless steels and copper alloys. / Kawakami, H.; Ilola, Risto (Corresponding Author); Straka, Ladislav; Papula, Suvi; Romu, Jyrki; Hänninen, Hannu; Mahlberg, Riitta; Heikkilä, M.

In: Journal of the Electrochemical Society, Vol. 155, No. 2, 2008, p. C62 - C68.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Kawakami, H.

AU - Ilola, Risto

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AU - Hänninen, Hannu

AU - Mahlberg, Riitta

AU - Heikkilä, M.

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AB - Photocatalytic activity of TiO2 -coated austenitic stainless steel (AISI 304) and copper alloys [deoxidized high phosphorus (DHP) copper and Nordic Gold] was studied by means of decomposition of methylene blue model waste water and open-circuit electrochemical potential measurements, and the photoinduced hydrophilicity was studied by means of contact angle measurements of water under ultraviolet irradiation. The TiO2 coatings were prepared by an atomic layer deposition technique from TiCl4 and H2O . The thicknesses of the prepared coatings were 5, 10, 50, 100, 150, and 200 nm . Morphology and crystal structure of the TiO2 coatings were studied using scanning electron microscope and X-ray diffraction techniques. Photocatalytic activity of the studied coatings was low with a coating thickness of 5 and 10 nm . When the coating thickness was 50 nm or higher for AISI 304 stainless steel, and 100 nm or higher for DHP and Nordic Gold copper alloys, the photoactivity was good, but no saturation or systematic effect of coating thickness or surface finish was observed. The photoinduced hydrophilicity was good with all studied coating thicknesses (50, 100, 150, and 200 nm ), with some exceptions.

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