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Zhao, Zhi-Jun,Hwang, Soon Hyoung,Kang, Hyeok-Joong,Jeon, Sohee,Bok, Moonjeong,Ahn, Sunggyun,Im, DaJeong,Hahn, Joonku,Kim, Hwi,Jeong, Jun-Ho American Chemical Society 2020 ACS APPLIED MATERIALS & INTERFACES Vol.12 No.1
<P>Herein, we develop an adhesive-free double-faced nanotransfer lithography (ADNT) technique based on the surface deformation of flexible substrates under the conditions of temperature and pressure control and thus address the challenge of realizing the mass production of large-area nanodevices in the fields of optics, metasurfaces, and holograms. During ADNT, which is conducted on a flexible polymer substrate above its glass transition temperature in the absence of adhesive materials and chemical bonding agents, nanostructures from the polymer stamp are attached to the deformed polymer substrate. Various silicon masters are employed to prove our method applicable to arbitrary nanopatterns, and diverse Ag and Au nanostructures are deposited on polymer molds to demonstrate the wide scope of useable metals. Finally, ADNT is used to (i) produce a flexible large-area hologram on the defect-free poly(methyl methacrylate) (PMMA) film and (ii) fabricate a metasurface hologram and a color filter on the front and back surfaces of the PMMA film, respectively, to realize dual functionality. Thus, it is concluded that the use of ADNT can decrease the fabrication time and cost of high-density nanodevices and facilitate their commercialization.</P> [FIG OMISSION]</BR>
Zhao, Zhi-Jun,Lee, Minpyo,Kang, Hyeokjung,Hwang, SoonHyoung,Jeon, Sohee,Park, Namkyoo,Park, Sang-Hu,Jeong, Jun-Ho American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.10
<P>In this study, 8 in. wafer-scale flexible polarization-dependent color filters with Ag-TiO<SUB>2</SUB> composite nanowires have been fabricated using nanoimprint and E-beam evaporation. The filters change their color via a simple rotation of the polarizer. In addition, the color of the filter can be controlled by altering the thickness of the Ag and TiO<SUB>2</SUB> nanowires deposited on the polymer patterns. Polarization-dependent color filters were realized by selective inhibition of transmission using the plasmonic resonance at the insulator/metal/insulator nanostructure interface, which occurs at particular wavelengths for the transverse magnetic polarizations. Special colors, including purple, blue, green, yellow, and pink, could be obtained with high transmission beyond 65% by varying the thickness of the deposited Ag and TiO<SUB>2</SUB> nanowires on the periodic polymer pattern under transverse magnetic polarization. In addition, a continuous color change was achieved by varying the polarization angle. Last, numerical simulations were implemented in comparison with the experimental results, and the mechanism was explained. We believe that this simple and cost-effective method can be applied to processes such as anticounterfeiting and holographic imaging as well as to color displays.</P> [FIG OMISSION]</BR>
Zhao, Zhi-Jun,Hwang, Soon Hyoung,Jeon, Sohee,Jung, Joo-Yun,Lee, Jihye,Choi, Dae-Geun,Choi, Jun-Hyuk,Park, Sang-Hu,Jeong, Jun-Ho Elsevier 2017 APPLIED SURFACE SCIENCE - Vol.420 No.-
<P><B>Abstract</B></P> <P>In this paper, we demonstrate that use of different nanoimprint resins as a polymer pattern has a significant effect on the morphology of silver (Ag) nanowires deposited via an E-beam evaporator. RM-311 and Ormo-stamp resins are chosen as a polymer pattern to form a line with dimensions of width (100nm)×space (100nm)×height (120nm) by using nanoimprint lithography (NIL). Their contact angles are then measured to evaluate their surface energies. In order to compare the properties of the Ag nanowires deposited on the various polymer patterns with different surface energies, hydrophobic surface treatment of the polymer pattern surface is implemented using self-assembled monolayers. In addition, gold and aluminum nanowires are fabricated for comparison with the Ag nanowires, with the differences in the nanowire morphologies being determined by the different atomic properties. The monocrystalline and polycrystalline structures of the various Ag nanowire formations are observed using transmission electron microscopy. In addition, the melting temperatures and optical properties of four kinds of Ag nanowire morphologies deposited on various polymer patterns are evaluated using a hot plate and an ultraviolet-visible (UV–vis) spectrometer, respectively. The results indicate that the morphology of the Ag nanowire determines the melting temperature and the transmission. We believe that these findings will greatly aid the development of NIL, along with physical evaporation and chemical deposition techniques, and will be widely employed in optics, biology, and surface wettability applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ag nanowires with various morphologies deposited on polymer patterns with different surface energies were fabricated via nanoimprint and e-beam evaporation. </LI> <LI> The formation mechanism behind the different morphologies of the Ag nanowires deposited on the polymer patterns with different surface energies was explained and confirmed. </LI> <LI> The morphologies of Ag nanowires have an important effect on their transmission and melting temperature. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Zhao, Xiaohui,Kim, Dul-Sun,Raghavan, Prasanth,Ahn, Jou-Hyeon,Ahn, Hyo-Jun,Ryu, Ho-Suk,Cho, Gyu-Bong,Noh, Jung-Pil Royal Swedish Academy of Sciences 2010 Physica scripta Vol.2010 No.t139
<P>Porous polymer membranes based on poly(vinylidene fluoride-<I>co</I>-hexafluoropropylene) were prepared by the phase inversion process, and the effect of processing parameters, such as the type of solvent and concentration of the polymer solution, on the membrane morphology and electrochemical properties of a polymer electrolyte (PE) was investigated. The membranes prepared were characterized by scanning electron microscopy and differential scanning calorimetry. PEs were prepared by soaking the porous membrane in 1 M LiPF<SUB>6</SUB> in ethylene carbonate/dimethyl carbonate, and their electrochemical performance was studied. The polymer concentration and/or non-solvent greatly influenced the morphology and electrochemical performance of the PE. A conductivity of ∼10<SUP>−3</SUP> S cm<SUP>−1</SUP> and charge/discharge capacities of ∼140 mAh g<SUP>−1</SUP> for the Li/LiFePO<SUB>4</SUB> cell were obtained.</P>
Zhao, Zhi-Jun,Yang, Jeong-Ho,Li, Xin,Park, Sang-Hu Elsevier 2016 Materials letters Vol.164 No.-
<P><B>Abstract</B></P> <P>We have investigated the formation of surface wavy structures (wrinkles) depending on the diverse surface conditions of a substrate, and now report the effect of various levels of reflection of incident ultraviolet (UV)-light. UV-curable resin layers with a thickness of 0.15mm were coated on three different surface conditions; transparent glass, fine and rough surface aluminum plate, to compare the formation of wrinkles on each surface. Short irradiations of UV-light for 10, 15, 20, 25 and 30s were exposed, resulting in the weak to full polymerization of the skin of a resin layer, respectively. The wavy structures were formed during thermal curing under room temperature after the short exposure of UV-light. The difference in reflection conditions resulting from the various surface roughnesses of the substrates led to changes in the amounts of polymerization, and the distribution of polymerization intensity through the layer thickness. Due to these different mechanisms, wrinkling shapes were quite distinguished. Through this work, we observed that controllable producing an approximately 33% maximum difference in the line width of wrinkles by using different substrate surface conditions.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The effect of a substrate reflection condition was investigated for diverse generation of surface wrinkles. </LI> <LI> It was studied that the fundamental mechanism on formation of wrinkles by weak-polymerization and thermal curing process. </LI> <LI> Irregular line-shapes of wrinkles with a range of 62–92μm in line width were fabricated by using the effect of substrate reflection conditions. </LI> <LI> Contact angle was varied depending on wrinkle shapes from 63° to 76°. </LI> </UL> </P>
( Xihong Zhao ),( Jun Wang ),( Fereidoun Forghani ),( Joong Hyun Park ),( Myoung Su Park ),( Kun Ho Seo ),( Deog Hwan Oh ) 한국미생물 · 생명공학회 2013 Journal of microbiology and biotechnology Vol.23 No.12
Conventional molecular detection methods cannot distinguish between viable and dead Escherichia coli O157 cells. In this study, the loop-mediated isothermal amplification (LAMP) method combined with propidium monoazide (PMA) treatment was developed to selectively detect viable E. coli O157 cells. Four primers, including outer primers and inner primers, were specially designed for the recognition of six distinct sequences on the serogroups (O157) of the specific rfbE gene of the E. coli O157 genome. PMA selectively penetrated through the compromised cell membranes and intercalated into DNA. Amplification of DNA from dead cells was completely inhibited by 3.0 μg/ml PMA, whereas the DNA derived from viable cells was amplified remarkably within 1 h by PMA-LAMP. Exhibiting high sensitivity and specificity, PMA-LAMP is a suitable method for evaluating the inactivation efficacy of slightly acidic electrolyzed water in broth. PMA-LAMP can selectively detect viable E. coli O157 cells. This study offers a novel molecular detection method to distinguish between viable and dead E. coli O157 cells.