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Lee, Seunghun,Ji, Kwang-sun,Park, Hyomin,Tark, Sung Ju,Park, Sungeun,Lee, Jeong Chul,Kim, Won Mok,Kang, Yoonmook,Lee, Hae-Seok,Kim, Donghwan Elsevier 2015 THIN SOLID FILMS - Vol.589 No.-
<P><B>Abstract</B></P> <P>We investigated the structural, optical, and electrical properties of Zn–In–Sn–O (ZITO) films prepared by RF magnetron sputtering for silicon heterojunction solar cells. The effects of Zn addition on the properties of the as-grown films were examined. XRD patterns of the ZITO films deposited at room temperature showed a broad peak. The cross-sectional TEM image of ZITO films at low Zn levels exhibited a typical fine or nanostructure embedded in an amorphous phase. On the other hand, at higher Zn addition, the films exhibited a completely amorphous phase. The carrier concentration decreased with increasing Zn content. The lowest electrical resistivity of 5.5×10<SUP>-4</SUP> Ωcm was observed for a ZITO film with 4.83 Znat.%. All ZITO films grown in this study showed transmittance of over 80% in the visible and near-infrared spectral range. The absorption was less than 5% in the visible region.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Zn–In–Sn–O(ZITO) films with various Zn and Sn contents prepared by RF magnetron sputtering </LI> <LI> Some ZITO films exhibited nanocrystalline structures embedded in an amorphous phase. </LI> <LI> The electrical and optical properties improved with increasing Zn content. </LI> </UL> </P>
Lee, Seungwon,Kim, Hyekang,You, Gihoon,Kim, Young-Min,Lee, Seunghun,Le, Viet-Hoan,Kwon, Ohseop,Im, Sin-Hyeog,Kim, You-Me,Kim, Kwang Soon,Sung, Young Chul,Kim, Ki Hean,Surh, Charles D.,Park, Yunji,Lee, American Society of Hematology 2019 Blood Vol.134 No.16
<B>Abstract</B><P>Lee and colleagues investigated the role of the intestinal microbiota in steady-state hematopoieisis, demonstrating that microbiota-derived DNA circulates to the bone marrow, where uptake by mononuclear cells leads to inflammatory cytokine production favoring myeloid-cell maturation of hematopoietic progenitors.</P>
Lee, Byung Yang,Seo, Sung Min,Lee, Dong Joon,Lee, Minbaek,Lee, Joohyung,Cheon, Jun-Ho,Cho, Eunju,Lee, Hyunjoong,Chung, In-Young,Park, Young June,Kim, Suhwan,Hong, Seunghun Royal Society of Chemistry 2010 Lab on a chip Vol.10 No.7
<P>We developed a carbon nanotube (CNT)-based biosensor <I>system</I>-<I>on</I>-<I>a</I>-<I>chip</I> (SoC) for the detection of a neurotransmitter. Here, 64 CNT-based sensors were integrated with silicon-based signal processing circuits in a single chip, which was made possible by combining several technological breakthroughs such as <I>efficient signal processing</I>, <I>uniform CNT networks</I>, and <I>biocompatible functionalization of CNT</I>-<I>based sensors</I>. The chip was utilized to detect glutamate, a neurotransmitter, where ammonia, a byproduct of the enzymatic reaction of glutamate and glutamate oxidase on CNT-based sensors, modulated the conductance signals to the CNT-based sensors. This is a major technological advancement in the integration of CNT-based sensors with microelectronics, and this chip can be readily integrated with larger scale lab-on-a-chip (LoC) systems for various applications such as LoC systems for neural networks.</P> <P>Graphic Abstract</P><P>Uniform arrays of carbon nanotube (CNT)-based biosensors were integrated with CMOS signal-processing circuits into a CNT-biosensor system-on-a-chip (SoC) for the detection of glutamate, a neurotransmitter. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b916975j'> </P>
Lee, Minbaek,Lee, Joohyung,Kim, Tae Hyun,Lee, Hyungwoo,Lee, Byung Yang,Park, June,Jhon, Young Min,Seong, Maeng-Je,Hong, Seunghun IOP Pub 2010 Nanotechnology Vol.21 No.5
<P>Nanoscale sensors based on single-walled carbon nanotube (SWNT) networks have been considered impractical due to several fundamental limitations such as a poor sensitivity and small signal-to-noise ratio. Herein, we present a strategy to overcome these fundamental problems and build highly-sensitive low-noise nanoscale sensors simply by controlling the structure of the SWNT networks. In this strategy, we prepared nanoscale width channels based on aligned SWNT networks using a directed assembly strategy. Significantly, the aligned network-based sensors with narrower channels exhibited even better signal-to-noise ratio than those with wider channels, which is opposite to conventional random network-based sensors. As a proof of concept, we demonstrated 100 nm scale low-noise sensors to detect mercury ions with the detection limit of ∼1 pM, which is superior to any state-of-the-art portable detection system and is below the allowable limit of mercury ions in drinking water set by most government environmental protection agencies. This is the first demonstration of 100 nm scale low-noise sensors based on SWNT networks. Considering the increased interests in high-density sensor arrays for healthcare and environmental protection, our strategy should have a significant impact on various industrial applications. </P>
Linear Ion Beam Applications for Roll-to-Roll Metal Thin Film Coatings on PET Substrates
Seunghun Lee,Do-Geun Kim 한국진공학회(ASCT) 2015 Applied Science and Convergence Technology Vol.24 No.5
Linear ion beams have been introduced for the ion beam treatments of flexible substrates in roll-to-roll web coating systems. Anode layer linear ion sources (300 mm width) were used to make the linear ion beams. Oxygen ion beams having an ion energy from 200 eV to 800 eV used for the adhesion improvement of Cu thin films on PET substrates. The Cu thin films deposited by a conventional magnetron sputtering on the oxygen ion beam treated PET substrates showed Class 5 adhesion defined by ASTM D3359-97 (tape test). Argon ion beams with 1∼3 keV used for the ion beam sputtering deposition process, which aims to control the initial layer before the magnetron sputtering deposition. When the discharge power of the linear ion source is 1.2 kW, static deposition rate of Cu and Ni were 7.4 and 3.5 A/sec, respectively.
Nanotube-Bridged Wireswith Sub-10 nm Gaps
Lee, ByungYang,Heo, Kwang,Schmucker, Abrin L.,Jin, Hye Jun,Lim, Jong Kuk,Kim, Taekyeong,Lee, Haemi,Jeon, Ki-Seok,Suh, Yung Doug,Mirkin, Chad A.,Hong, Seunghun American ChemicalSociety 2012 Nano letters Vol.12 No.4
<P>We report a simple but efficient method to synthesizecarbon nanotube-bridgedwires (NBWs) with gaps as small as 5 nm. In this method, we have combineda strategy for assembling carbon nanotubes (CNTs) inside anodizedaluminum oxide pores and the on-wire lithography technique to fabricateCNT-bridged wires with gap sizes deliberately tailored over the 5–600nm range. As a proof-of-concept demonstration of the utility of thisarchitecture, we have prepared NBW-based chemical and biosensors whichexhibit higher analyte sensitivity (lower limits of detection) thanthose based on planar CNT networks. This observation is attributedto a greater surface-to-volume ratio of CNTs in the NBWs than thosein the planar CNT devices. Because of the ease of synthesis and highyield of NBWs, this technique may enable the further incorporationof CNT-based architectures into various nanoelectronic and sensorplatforms.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2012/nalefd.2012.12.issue-4/nl204259t/production/images/medium/nl-2011-04259t_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl204259t'>ACS Electronic Supporting Info</A></P>