Nanomaterials 2012, 2(1), 65-78; doi:10.3390/nano2010065
Article

Wettability of Y2O3: A Relative Analysis of Thermally Oxidized, Reactively Sputtered and Template Assisted Nanostructured Coatings

Surface Engineering Division, CSIR-National Aerospace Laboratories, Bangalore-560017, India
* Author to whom correspondence should be addressed.
Received: 6 December 2011; in revised form: 17 January 2012 / Accepted: 21 February 2012 / Published: 29 February 2012
PDF Full-text Download PDF Full-Text [620 KB, uploaded 29 February 2012 09:46 CET]
Abstract: The wettability of reactively sputtered Y2O3, thermally oxidized Y-Y2O3 and Cd-CdO template assisted Y2O3 coatings has been studied. The wettability of as-deposited Y2O3 coatings was determined by contact angle measurements. The water contact angles for reactively sputtered, thermally oxidized and template assisted Y2O3 nanostructured coatings were 99°, 117° and 155°, respectively. The average surface roughness values of reactively sputtered, thermally oxidized and template assisted Y2O3 coatings were determined by using atomic force microscopy and the corresponding values were 3, 11 and 180 nm, respectively. The low contact angle of the sputter deposited Y2O3 and thermally oxidized Y-Y2O3 coatings is attributed to a densely packed nano-grain like microstructure without any void space, leading to low surface roughness. A water droplet on such surfaces is mostly in contact with a solid surface relative to a void space, leading to a hydrophobic surface (low contact angle). Surface roughness is a crucial factor for the fabrication of a superhydrophobic surface. For Y2O3 coatings, the surface roughness was improved by depositing a thin film of Y2O3 on the Cd-CdO template (average roughness = 178 nm), which resulted in a contact angle greater than 150°. The work of adhesion of water was very high for the reactively sputtered Y2O3 (54 mJ/m2) and thermally oxidized Y-Y2O3 coatings (43 mJ/m2) compared to the Cd-CdO template assisted Y2O3 coating (7 mJ/m2).
Keywords: yttrium oxide; cadmium oxide; sputtering; template assisted growth; wettability; work of adhesion; thermal oxidation; surface roughness

Article Statistics

Load and display the download statistics.

Citations to this Article

Cite This Article

MDPI and ACS Style

Barshilia, H.C.; Chaudhary, A.; Kumar, P.; Manikandanath, N.T. Wettability of Y2O3: A Relative Analysis of Thermally Oxidized, Reactively Sputtered and Template Assisted Nanostructured Coatings. Nanomaterials 2012, 2, 65-78.

AMA Style

Barshilia HC, Chaudhary A, Kumar P, Manikandanath NT. Wettability of Y2O3: A Relative Analysis of Thermally Oxidized, Reactively Sputtered and Template Assisted Nanostructured Coatings. Nanomaterials. 2012; 2(1):65-78.

Chicago/Turabian Style

Barshilia, Harish C.; Chaudhary, Archana; Kumar, Praveen; Manikandanath, Natarajan T. 2012. "Wettability of Y2O3: A Relative Analysis of Thermally Oxidized, Reactively Sputtered and Template Assisted Nanostructured Coatings." Nanomaterials 2, no. 1: 65-78.

Nanomaterials EISSN 2079-4991 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert