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JIN-YEOL KIM,,KUNBAE NOH,CHULMIN CHOI,KARLA S. BRAMMER,MARIANA LOYA,LI-HAN CHEN,SUNGHO JIN,BRAMMER 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2010 NANO Vol.5 No.2
We have shown in this paper that the self-ordered pore structure of anodic aluminum oxide (AAO) can be utilized as a basis to conveniently form large-area Al2O3 nanowire arrays on a glass surface. An aluminum oxide nanowire array has been produced by aluminum film deposition on glass followed by anodization, then simple chemical etching. The glass surface as prepared is highly superhydrophobic, with a contact angle as high as 169°. The thinness (~ 340 nm) and vertical alignment of the aluminum oxide nanowires with empty spaces in-between essentially contribute to maintaining the optical transparency of the glass substrate. Interestingly, substantially suppressed UV transmission in the ~ 300–400 nm spectrum region was observed with the presence of the Al2O3 nanowires on the glass substrate. Such a durable surface ceramic nanowire structure can be useful for producing superhydrophobic, self-cleaning glasses with a variety of potential applications such as UV protecting glass windows for high rise buildings with reduced consumption of water and cleaning chemicals for positive environmental effects.
Geometry transformation and alterations of periodically patterned Si nanotemplates by dry oxidation
Park, Jeongwon,Chen, Li-Han,Hong, Daehoon,Choi, Chulmin,Loya, Mariana,Brammer, Karla,Bandaru, Prab,Jin, Sungho IOP Pub 2009 Nanotechnology Vol.20 No.1
<P>We report on the size-dependent transformation and geometrical modifications of periodically patterned Si templates by a combination of dry oxidation and chemical etching. Deep ultraviolet lithography patterned circular holes with diameters varying between 190 nm and 1 µm on Si wafers were oxidized at 1000 °C using dry oxygen for various durations, with selected samples chemically etched for oxide removal for additional alterations. An interesting phenomenon of a circular-to-square shape transformation of the holes was observed, which was particularly pronounced in the sub-200 nm regime. We tentatively attribute the change to the surface energy and geometry constraints in nanoscale patterns. </P>