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Hierarchical multi-level block copolymer patterns by multiple self-assembly
Jung, Hyunsung,Shin, Won Ho,Park, Tae Wan,Choi, Young Joong,Yoon, Young Joon,Park, Sung Heum,Lim, Jae-Hong,Kwon, Jung-Dae,Lee, Jung Woo,Kwon, Se-Hun,Seong, Gi Hun,Kim, Kwang Ho,Park, Woon Ik The Royal Society of Chemistry 2019 Nanoscale Vol.11 No.17
<P>Uniform, well-ordered sub-20 nm patterns can be generated by the templated self-assembly of block copolymers (BCPs) with a high Flory-Huggins interaction parameter (<I>χ</I>). However, the self-assembled BCP monolayers remain limited in the possible structural geometries. Here, we introduce a multiple self-assembly method which uses di-BCPs to produce diverse morphologies, such as dot, dot-in-honeycomb, line-on-dot, double-dot, pondering, dot-in-pondering, and line-on-pondering patterns. To improve the diversity of BCP morphological structures, we employed sphere-forming and cylinder-forming poly(styrene-<I>block</I>-dimethylsiloxane) (PS-<I>b</I>-PDMS) BCPs with a high <I>χ</I>. The self-assembled mono-layer and double-layer SiOx dot patterns were modified at a high temperature (∼800 °C), showing hexagonally arranged (dot) and double-hexagonally arranged (pondering) SiOx patterns, respectively. We successfully obtained additional new nanostructures (big-dot, dot-in-honeycomb, line-on-dot, pondering, dot-in-pondering, and line-on-pondering types) through a second self-assembly of cylinder-forming BCPs using the dot and pondering patterns as guiding templates. This simple approach can likely be extended to the multiple self-assembly of many other BCPs with good functionality, significantly contributing to the development of various nanodevices.</P>
One-Pot Process in Scalable Bath for Water-Dispersed ZnS Nanocrystals with the Tailored Size
Jung, Hyunsung,Phelps, Tommy J.,Rondinone, Adam J.,Jellison, Gerald E.,Duty, Chad E.,Han, Kee Sung,Moon, Ji-Won American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.5
<P>Well-dispersed ZnS nanocrystals with tailored size in aqueous solutions were synthesized by employing cysteine-sulfur (Cys-S) complexes with low molecular weight in a scalable anoxic vessel. High yield production of water-dispersed ZnS nanocrystals on a 10-L scale was demonstrated in an aqueous solution process. The average crystallite size of ZnS was controlled by changing the ratio of the cysteine to sulfide in the applied Cys-S complexes. A decrease in the crystallite size of ZnS likely resulted in both the blue shift of peak positions and the relative variation of peak intensities in the photoluminescence properties. Additionally, the pH-dependent stability against aggregation of ZnS nanocrystals was investigated to reduce agglomeration.</P>
Logic Operations Based on Magnetic-Vortex-State Networks
Jung, Hyunsung,Choi, Youn-Seok,Lee, Ki-Suk,Han, Dong-Soo,Yu, Young-Sang,Im, Mi-Young,Fischer, Peter,Kim, Sang-Koog American Chemical Society 2012 ACS NANO Vol.6 No.5
<P>Logic operations based on coupled magnetic vortices were experimentally demonstrated. We utilized a simple chain structure consisting of three physically separated but dipolar-coupled vortex-state Permalloy disks as well as two electrodes for application of the logical inputs. We directly monitored the vortex gyrations in the middle disk, as the logical output, by time-resolved full-field soft X-ray microscopy measurements. By manipulating the relative polarization configurations of both end disks, two different logic operations are programmable: the XOR operation for the parallel polarization and the OR operation for the antiparallel polarization. This work paves the way for new-type programmable logic gates based on the coupled vortex-gyration dynamics achievable in vortex-state networks. The advantages are as follows: a low-power input signal by means of resonant vortex excitation, low-energy dissipation during signal transportation by selection of low-damping materials, and a simple patterned-array structure.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2012/ancac3.2012.6.issue-5/nn3000143/production/images/medium/nn-2012-000143_0002.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn3000143'>ACS Electronic Supporting Info</A></P>
Jung, Hyunsung,Lim, Jae-Hong,Park, Hosik,Kim, Jiwon,Choa, Yong-Ho,Myung, Nosang V. American Chemical Society 2013 The Journal of Physical Chemistry Part C Vol.117 No.33
<P>Millimeter-long one-dimensional Sb<SUB><I>x</I></SUB>Te<SUB><I>y</I></SUB> nanoribbons with controlled composition and dimensions (down to 16 nm) were demonstrated using lithographically patterned electrodeposition at predetermined locations. The morphology of nanoribbons was tuned by applying a pulse plating technique and addition of surfactant (i.e., CTAB) in the electrolyte. Independent of geometry, the deposit Te content decreased from 69 to 51 at. % Te with an increase in the applied potential. The electrical resistivity and field effect hole mobility were strongly dependent on the composition of the nanoribbon where the lowest electrical resistivity (7.9 × 10<SUP>–4</SUP> ohm m) with highest hole mobility (24.6 cm<SUP>2</SUP>/V s) was observed from the Sb<SUB>2</SUB>Te<SUB>3</SUB> nanoribbon. The temperature-dependent electrical resistance measurement shows low-temperature phase transition behaviors in the temperatures between 333 and 351 K.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2013/jpccck.2013.117.issue-33/jp4052006/production/images/medium/jp-2013-052006_0010.gif'></P>