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Yoon H.,Intelligent Hybrids Research Center | Woo H.,Intelligent Hybrids Research Center | Choi M.K.,Intelligent Hybrids Research Center | Suh K.Y.,Seoul National University | Char K.,Intelligent Hybrids Research Center
Langmuir | Year: 2010

We introduce a one-step procedure of bending nanopillars, which simply involves oblique metal deposition at a tilted angle of 45° on the pillars by thermal evaporation. The face selection in the bending procedure was determined by the nature of residual stress generated in the metal film during evaporation. If the stress was tensile as with many metals (σ f>0), the Janus nanopillars were bent toward the metal face; if the residual stress was compressive as in the case of Al (σ f<0), they were bent toward the polymer face. It has also been demonstrated that groups of Janus nanopillars could be bent in different directions on the same substrate with the aid of a shadow-mask deposition. The degree of bending increased with the decrease in pillar diameter in the range of 360-800 nm for a fixed height of 1 μm. © 2010 American Chemical Society.

Ki Bae W.,Intelligent Hybrids Research Center | Ki Bae W.,Seoul Semiconductor | Kwak J.,Seoul Semiconductor | Lim J.,Intelligent Hybrids Research Center | And 5 more authors.
Nano Letters | Year: 2010

A systematic analysis of the exciton-recombination zone within all-quantum dot (QD) multilayer films prepared by a layer-by-layer assembly method was made, using sensing QD layers in QD-based light-emitting diodes (QLEDs). Large area practical multicolored colloidal QLEDs were also demonstrated by patterning and placing variously colored QDs (red, orange, yellow-green, and green) in the exciton-recombination zone. © 2010 American Chemical Society.

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