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Jung-Sub Wi,Jeong Dae Kim,Wonseok Lee,Hyunsik Choi,Minjeong Kwak,Jungkeun Song,Tae Geol Lee,Jong G. Ok 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.9 No.2
To make surface enhanced Raman scattering (SERS) sensors more practical, we propose nanoporous Ag disks as SERSactive plasmonic structures that can be readily inkjet-printed just before use to avoid degradation of SERS enhancement. Together with the aid of the enhanced plasmonic fi elds from the nanoporous Ag (confirmed by electromagnetic simulation), we utilize a coffee-ring effect to concentrate target analytes, which is demonstrated by confocal Raman measurements. By using the proposed SERS sensor, Raman signals of TiO 2 nanoparticles with a concentration of ppm to sub-ppb have been successfully measured. TiO 2 in commercial consumables has been also detected by distinguishing its crystalline phase.
Glucose 투여가 최대운동시 혈중 젖산변화에 미치는 영향
백남섭,정위곤 龍仁大學校 1997 용인대학교 논문집 Vol.13 No.-
The purpose of this study was to investigate the effect of Glucose on changes and recovers of blood lactate after all-out treadmill run exercise as metabolism response by temporary treatment of Glucose. All subjects were 8 males football athletes on university who divided into 6 groups(placebo and during, 0, 15, 30, 60 min. before exercise) according to dosage time conditions. Therefore, the design for this study was repeated measurement within group and between groups as independent variations were dosage time and exercise condition as blood sampling time(resting immediately, 10, 20, 30 min. after exercise), dependent variations were blood lactate with recorded performance time of all subjects. The protocol for exercise load was Bruce Treadmill Protocol running from rest to all-out state progressively. All raw data were analysed by MANOVA for statistical significance. The following conclusion was made : Lactate showed significant changes according to 5 conditions. All groups showed the highest level at immediate exercise, dosed group at 30 min. before exercise was the highest level with the lowest level on dosed group at just before exercise(p<.001). Lactate showed significant changes among 6 groups (p<.05). There were also showed higher on dosed grouts than control grouts in recovery rate with the highest level on dosed group at 60 min. before exercise.
Enhanced Development Properties of IPA (Isopropyl Alcohol) on the PMMA Electron Beam Resist
( Jung Sub Wi ),( Hyo Sung Lee ),( Ki Bum Kim ) 대한금속재료학회 ( 구 대한금속학회 ) 2007 ELECTRONIC MATERIALS LETTERS Vol.3 No.1
Development characteristics of PMMA electron-beam resist were quantitatively investigated by employing IPA (isopropyl alcohol) as a single component developer. Compared with a conventionally used MIBK:IPA (1:3) developer, the contrast value is improved by about 80% and the surface roughness of the resist by nearly 30%, although the critical dose was sacrificed. These improvements were confirmed by the patterning of semi-dense line arrays and explained in terms of the development rate and phase separation behavior of PMMA.
Porous gold nanodisks with multiple internal hot spots
Wi, Jung-Sub,Tominaka, Satoshi,Uosaki, Kohei,Nagao, Tadaaki The Royal Society of Chemistry 2012 Physical chemistry chemical physics Vol.14 No.25
<P>For increasing the number of internal hot spots in the individual plasmonic nanoparticles, porous Au nanostructures were synthesized by a hybrid approach combining a physical process, which defined the overall shapes and dimensions of the nanostructures, and a chemical process, which incorporated nanopores inside the patterned nanostructures. This approach allows us to synthesize lithographically designed Au nanodisks containing numerous internal Raman hot spots in the form of nanopores. The increased number of hot spots successfully improved SERS intensity, and this experimental result was further elucidated by numerical electromagnetic simulations. The highly improved and homogeneous SERS intensities illustrate the great potential of the porous plasmonic nanodisks as a sensitive molecular imaging agent.</P> <P>Graphic Abstract</P><P>Porous plasmonic nanostructures with enhanced SERS activity can be synthesized by incorporating chemically formed nanopores into physically fabricated nanostructures. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2cp40578d'> </P>
Fabrication of Silicon Nanopillar Teradot Arrays by Electron-Beam Patterning for Nanoimprint Molds
Wi, Jung-Sub,Lee, Hyo-Sung,Lim, Kipil,Nam, Sung-Wook,Kim, Hyun-Mi,Park, Soo-Yeon,Lee, Jae Jong,Hong, Chris Daehoon,Jin, Sungho,Kim, Ki-Bum WILEY-VCH Verlag 2008 Small Vol.4 No.12
<B>Graphic Abstract</B> <P>Critical issues that occur during the fabrication of high-density nanostructures by e-beam lithography are considered. A 25-nm-pitch Si nanopillar array and a 15-nm-pitch resist nanodot array are fabricated. Transfer of 1 teradot inch<SUP>−2</SUP> patterns from the nanopillar array to a polymer surface is carried out by nanoimprint lithography (see picture). <img src='wiley_img/16136810-2008-4-12-SMLL200800625-content.gif' alt='wiley_img/16136810-2008-4-12-SMLL200800625-content'> </P>
Wi, Jung-Sub,Wilson, Robert J,Lee, Donkoun,White, Robert M,Wang, Shan X IOP Pub 2011 Nanotechnology Vol.22 No.30
<P>Si nano-well arrays, with precisely controlled undercut Si sidewall profiles and flat bottomed pockets, enable uniform nanoscale pattern transfer from resists to metal deposits without degradation of the initial lithographic resolution, as verified by the formation of arrays of Au nano-dots with 10 nm diameter. An additional functionality of the Si nano-wells as local nano-reactors, where the patterned material is enclosed in a Si pocket during high temperature reaction, is demonstrated by thermally inducing a phase transformation of the as-deposited A1 phase of FePt nano-dots to the high coercivity, chemically ordered L1<SUB>0</SUB> phase. </P>
Wi, Jung-Sub,Lee, Seungjo,Lee, Sung Ho,Oh, Dong Kyo,Lee, Kyu-Tae,Park, Inkyu,Kwak, Moon Kyu,Ok, Jong G. The Royal Society of Chemistry 2017 Nanoscale Vol.9 No.4
<P>We develop scalable 3D plasmonic nanoarchitectures comprising a double-bent nanoscale Au strip array integrated within the transparent nanograting framework, which can be continuously fabricated on a large-area flexible substrate via roll-to-roll nanoimprint lithography and angled Au deposition, realizing localized surface plasmon resonance with higher sensitivity in a smaller footprint.</P>