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Yun, Sang-Hyun,Sohn, Byeong-Hyeok,Jung, Jin Chul,Zin, Wang-Cheol,Ree, Moonhor,Park, Joon Won IOP Pub 2006 Nanotechnology Vol.17 No.2
<P>We have demonstrated micropatterning of a single layer of nanoparticles by combining a self-assembly of diblock copolymer micelles with conventional and soft lithographical methods. On a photoresist micropattern fabricated by conventional photolithography, a single layer of diblock copolymer micelles containing precursors of nanoparticles was spin-coated. By plasma and lift-off processes, nanoparticles with the preservation of a pseudo-hexagonal order of micelles were synthesized in the micropattern without their aggregation. In addition, soft lithography of the microcontact printing technique was combined with the process of diblock copolymer micelles to produce micropatterns of nanoparticles. As an ink of the microcontact printing process, a single-layered film of diblock copolymer micelles was spin-coated directly onto the stamp and then transferred on the substrate by stamping. Formation of a single layer of nanoparticles in the micropattern was carried out by plasma treatment.</P>
Micellar nanotubes and AAO nanopores decorated with nanoparticles
Jeon, Seung-Min,Lee, Sung Hwa,Sohn, Byeong-Hyeok,Song, Ohsung IOP Pub 2009 Nanotechnology Vol.20 No.28
<P>We demonstrated that anodized aluminum oxide (AAO) enables the fabrication of micellar nanotubes and nanopores decorated with nanoparticles. Block copolymer micelles containing precursors of nanoparticles were coated on the nanopores of AAO, from which we were able to select nanotubes containing nanoparticles or nanopores decorated with nanoparticles by removing the AAO template or the copolymer. Upon removal of the AAO, the micellar nanotubes with nanoparticles were produced, whereas the nanopores of AAO were decorated with nanoparticles by eliminating the copolymer. Since a variety of nanoparticles can be synthesized in addition to full control over the size and spacing of nanoparticles by the copolymer micellar approach, the methodology demonstrated here can allow fabricating functional nanotubes or nanopores with a selection of the type and size of nanoparticles. </P>
Supracolloidal polymer chains of diblock copolymer micelles
Kim, Jeong-Hee,Kwon, Won Jong,Sohn, Byeong-Hyeok The Royal Society of Chemistry 2015 Chemical communications Vol.51 No.16
<P>Directional attraction with lateral repulsion between colloidal nanoparticles can create their supracolloidal chains. Here, we demonstrate supracolloidal polymers of diblock copolymer micelles, which were polymerized by adjusting the polarity of the solvent. We also synthesized supracolloidal random and block copolymer chains.</P> <P>Graphic Abstract</P><P>Directional attraction with lateral repulsion between colloidal nanoparticles can create their supracolloidal chains. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cc09518a'> </P>
Jin, Shanhua,Lee, Yuwon,Jeon, Seung-Min,Sohn, Byeong-Hyeok,Chae, Weon-Sik,Lee, Jin-Kyu The Royal Society of Chemistry 2012 Journal of materials chemistry Vol.22 No.44
<P>Polymer nanotubes (PNTs) were fabricated by a simple spin casting of the polymer solution into nanochannels of anodic aluminum oxide (AAO) membranes. The thickness of the polymer nanotubes could be reproducibly controlled by changing the concentration of the polymer solutions. Furthermore, multiple spin casting of different polymer solutions could produce multi-layer PNTs (MPNTs), whose formation was confirmed by a selective staining technique in transmission electron microscope (TEM) experiments. Luminescent molecules such as blue-emitting Ir(<SMALL>III</SMALL>) complex and orange-emitting rhodamine B derivative could be uniformly incorporated into each polymer layer simply by mixing them into each polymer solution. These dye-incorporated MPNTs could be easily fabricated by the same spin casting method. Their optical properties were determined by UV-Vis spectroscopy, photoluminescence, and fluorescence microscopy. The morphology of the nanotubes was characterized using a field emission-scanning electron microscope (FE-SEM) and TEM. These results showed that the MPNTs could be reproducibly fabricated throughout the length of the nanochannels of the AAO templates.</P> <P>Graphic Abstract</P><P>Various single-layer and multi-layer polymer nanotubes were successfully fabricated by a simple spin-casting method using AAO templates. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2jm34726a'> </P>
Micropatterning of block copolymer micelle thin films using solvent capillary contact printing
Hwang, Wonseok,Ham, Moon-Ho,Sohn, Byeong-Hyeok,Huh, June,Kang, Yong Soo,Jeong, Wonyong,Myoung, Jae-Min,Park, Cheolmin IOP Pub 2005 Nanotechnology Vol.16 No.12
<P>This paper describes a new and facile method, ‘solvent capillary contact printing (SCCP)’, that fabricates <I>micro-patterned</I> hydrophilic/hydrophobic surface caused by the selective manipulation of nanometre-scale block copolymer micelles. The method is based on using capillary injection and evaporation of a solvent, which is preferential to a core block of micelles, through poly(dimethylsiloxane) (PDMS) microchannels placed on a pre-formed block copolymer micelle monolayer. We produced well-defined surface micropatterns where a nanostructure consisting of core-opened micelles gave rise to hydrophilic surface property in the regions in contact with solvent while one consisting of hemispherical micelles remained hydrophobic in the regions contacted by the PDMS mould. Our method allows repetitive micropatterning; a surface micropattern previously formed is simply erased by exposure of preferential solvent vapour due to reversible structure modification of micelles. Furthermore, SCCP with various metal salts, precursors of metal nanoparticles, enables us to fabricate micropatterned arrays of well-separated metal nanoparticles which can be used as a catalyst for synthesizing nanowires. The micropatterned arrays of GaN nanowires are demonstrated, fabricated by SCCP. </P>
Kim, Sung-Soo,Kang, Donghwi,Sohn, Byeong-Hyeok IOP 2017 Nanotechnology Vol.28 No.22
<P>We report the synthesis of arrayed nanorings with tunable physical dimensions from thin films of polystyrene-<I>block</I>-poly(4-vinylpyridine) (PS-P4VP) micelles. For accurate control of the inner and outer diameters of the nanorings, we added imidazolium-based ionic liquids (ILs) into the micellar solution, which were eventually incorporated into the micellar cores. We observed the structural changes of the micellar cores coated on a substrate due to the presence of ILs. The spin-coated micellar cores were treated with an acidic precursor solution and generated toroid nanostructures, of which size depended on the amount of IL loaded into the micelles. We then treated the transformed micellar films with oxygen plasma to produce arrays of various metal and oxide nanorings on a substrate. The spacings and diameters of nanorings were governed by the molecular weight of the PS-P4VP and the amount of IL used. We also demonstrated that arrayed Pt nanorings enabled the fabrication of reduced graphene oxide anti-nanoring arrays via a catalytic tailoring process.</P>