Publications (8)60.39 Total impact
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Article: Facile fabrication of transparent superhydrophobic surfaces by spray deposition.
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ABSTRACT: Herein, we present a one-step facile spray-deposition process for fabricating a new superhydrophobic surface with a novel statistical copolymer. The polymeric material is relatively inexpensive, easily prepared, transparent, solvent-processable, very simple, and applicable to rugged substrates. The materials presented herein also feature a near-perfect superhydrophobic surface with a static water contact angle of 178° and a transmittance of higher than 75% at 550 nm wavelength.ACS Applied Materials & Interfaces 07/2011; 3(7):2179-83. · 4.53 Impact Factor -
Article: Switchable transparency and wetting of elastomeric smart windows.
Advanced Materials 11/2010; 22(44):5013-7. · 13.88 Impact Factor -
Article: Poly(3‐hexylthiophene) Nanorods with Aligned Chain Orientation for Organic Photovoltaics
Advanced Functional Materials 01/2010; 20(4):540 - 545. · 10.18 Impact Factor -
Article: High-mobility low-temperature ZnO transistors with low-voltage operation
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ABSTRACT: Low voltage high mobility n-type thin film transistors �TFTs� based on sol-gel processed zinc oxide �ZnO� were fabricated using a high capacitance ion gel gate dielectric. The ion gel gated solution-processed ZnO TFTs were found to exhibit excellent electrical properties. TFT carrier mobilities were 13 cm2 /V s, ON/OFF current ratios were 105, regardless of the sintering temperature used for the preparation of the ZnO thin films. Ion gel gated ZnO TFTs are successfully demonstrated on plastic substrates for the large area flexible electronics.Applied Physics Letters 01/2010; · 3.84 Impact Factor -
Article: Chemical and geometrical criteria for the release of elastomeric 1D nanoarrays from porous nanotemplates.
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ABSTRACT: Releasing 1D nanoarrays from nanotemplates is a significant challenge for the integration of mechanically soft materials in a variety of newly emerging technological areas. To fabricate nanoarrays without defects, the combined effects of the surface energy and the geometric features of the nanotemplate should be considered. A previously reported approach based on the correlation between the adhesion energy and the real contact area was not satisfactory to describe the rupture conditions of the nanofibers while they were being peeled off from the porous template. Here we demonstrate that the aspect ratio rather than the contact area of the nanoporous template is the key factor determining the upper limit of the pore length of the nanotemplate with respect to the rupture of the nanoarray during separation. We propose that the value of alpha(c)*, which is calculated with a simple expression in which the adhesion energy is multiplied by the aspect ratio, can be used as an excellent criterion for the fabrication of 1D nanoarrays without defects with a simple peel-off processes. Our approach opens up new applications for unconventional lithographic techniques, such as soft lithography, imprint lithography, and others.Langmuir 12/2009; 26(5):3252-6. · 4.19 Impact Factor -
Article: Superhydrophobic to Superhydrophilic Wetting Transition with Programmable Ion‐Pairing Interaction
Advanced Materials 10/2008; 20(23):4438 - 4441. · 13.88 Impact Factor -
Article: UV-driven reversible switching of a roselike vanadium oxide film between superhydrophobicity and superhydrophilicity.
Journal of the American Chemical Society 05/2007; 129(14):4128-9. · 9.91 Impact Factor -
Article: High efficiency polymer solar cells with wet deposited plasmonic gold nanodots
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ABSTRACT: We report the enhanced performance of poly(3-hexylthiophene)/[6,6]-phenyl-C61 butyric acid methyl ester (P3HT/PCBM) bulk heterojunction solar cells with wet deposited interfacial gold nanostructures on their indium tin oxide (ITO) surfaces. To produce localized surface plasmons at the ITO surfaces, gold nanostructures were fabricated through the layer-by-layer deposition of gold nanorods onto the ITO substrates and transformed into nanodots through a thermally induced shape transition. The incorporation of plasmonic gold nanodots on the ITO surface was found to result in an increase in the power conversion efficiency from 3.04% to 3.65%, which is due to the presence of the resulting plasmon field.Organic Electronics.
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Institutions
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2007–2010
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Pohang University of Science and Technology
- Department of Chemical Engineering
Andong, North Gyeongsang, South Korea
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