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  4. Electrochemical rutile and anatase formation on PEO surfaces
 
Zitierlink DOI
10.26092/elib/7

Electrochemical rutile and anatase formation on PEO surfaces

Veröffentlichungsdatum
2017-04-15
Autoren
Friedemann, Ariane  
Gesing, Thorsten M.  
Plagemann, Peter  
Zusammenfassung
A highly porous surface with a high crystalline content and resultant photocatalytic activity is ensured through the process of plasma electrolytic oxidation on pure titanium. In the present study the morphology, crystallinity and photocatalytic activity of plasma electrolytic oxidized TiO2-surfaces were investigated. The surfaces were prepared in acidic and alkaline electrolytes over an applied voltage range between 50 V and 300 V to optimize the crystalline and photocatalytic properties. Scanning electron microscopy (SEM) and X-ray powder diffraction (XRD) were selected to determine the morphologies which differ according to the type of electrolyte as well as the crystal structures of anatase and rutile on the surface material, which increase with the applied voltage. The oxide surfaces did not show morphological differences compared to typical PEO surfaces with the exception of oxide films obtained in H2SO4-solution which also exhibited an astounding amount of rutile even with low applied voltages. The increased parts of anatase and rutile on the surfaces resulted in photocatalytic activity, which was investigated under UV-light using methylene blue, while the PEO surfaces showed degradation activity. There is an indication that a high proportion of anatase and small amounts of rutile in the PEO layers positively influence photocatalytic activity.
Schlagwörter
Plasma electrolytic oxidation

; 

TiO2 layer

; 

Anatase Rutile

; 

Crystallinity

; 

Photocatalytic activity
Institution
Universität Bremen  
Fachbereich
Fachbereich 02: Biologie/Chemie (FB 02)  
Dokumenttyp
Artikel/Aufsatz
Zeitschrift/Sammelwerk
Surface and Coatings Technology  
Startseite
139
Endseite
149
Zweitveröffentlichung
Nein
Sprache
Englisch
Dateien
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Vorschaubild
Name

117_Post.pdf

Description
Postprint
Size

2.67 MB

Format

Adobe PDF

Checksum

(MD5):78e74b5cd5718eeab6e4ec94071b3156

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