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Lee, Soo Hong,Yu, Seung-Ho,Lee, Ji Eun,Jin, Aihua,Lee, Dong Jun,Lee, Nohyun,Jo, Hyungyung,Shin, Kwangsoo,Ahn, Tae-Young,Kim, Young-Woon,Choe, Heeman,Sung, Yung-Eun,Hyeon, Taeghwan American Chemical Society 2013 Nano letters Vol.13 No.9
<P>Although different kinds of metal oxide nanoparticles continue to be proposed as anode materials for lithium ion batteries (LIBs), their cycle life and power density are still not suitable for commercial applications. Metal oxide nanoparticles have a large storage capacity, but they suffer from the excessive generation of solid–electrolyte interphase (SEI) on the surface, low electrical conductivity, and mechanical degradation and pulverization resulted from severe volume expansion during cycling. Herein we present the preparation of mesoporous iron oxide nanoparticle clusters (MIONCs) by a bottom-up self-assembly approach and demonstrate that they exhibit excellent cyclic stability and rate capability derived from their three-dimensional mesoporous nanostructure. By controlling the geometric configuration, we can achieve stable interfaces between the electrolyte and active materials, resulting in SEI formation confined on the outer surface of the MIONCs.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2013/nalefd.2013.13.issue-9/nl401952h/production/images/medium/nl-2013-01952h_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl401952h'>ACS Electronic Supporting Info</A></P>
Monitoring of 75 veterinary drug residues for fishery products on the Korean market with LC-MS/MS
Eunhye Lee,Sooyeon Choi,Seonhye Jo,Younggi Jung,Hyunjeong You,Joonshik Park,Mikyoung Jin,Sookhee Ha,Jaeyoung Shim,Kwangsoo Yoo,Gyeongyeol Kim,Kwangsoo Lee,Dongsul Kim,Changhee Lee 한국분석과학회 2017 학술대회논문집 Vol.2017 No.11
Etching Characteristics of Carbon Nanotube Thin Films in O<sub>2</sub>/Ar Plasma
Lee, Jaemin,Efremov, Alexander,Lee, Junmyung,Kim, Kwangsoo,Kwon, Kwang-Ho American Scientific Publishers 2016 Journal of nanoscience and nanotechnology Vol.16 No.11
<P>In this work, we studied the influence of O-2/Ar mixing ratio on the etching characteristics of carbon nanotube (CNT) thin films in inductively coupled plasma at constant gas pressure (6 mTorr), input power (400 W), bias power (50 W), and total gas flow rate (40 sccm). The etching mechanism was analyzed based on both plasma diagnostics (optical emission spectroscopy, Langmuir probe) and plasma modeling. It was found that increasing the Ar mixing ratio in the range of 0-75% Ar lowered the O atom density but increased the CNT film etching rate (44.3-88.4 nm/min). It is proposed that the CNT film etching process is mainly driven by the chemical etching pathway, whereas an increase in the etching rate may be associated with increasing reaction probability.</P>
Lee, Nohyun,Cho, Hye Rim,Oh, Myoung Hwan,Lee, Soo Hong,Kim, Kangmin,Kim, Byung Hyo,Shin, Kwangsoo,Ahn, Tae-Young,Choi, Jin Woo,Kim, Young-Woon,Choi, Seung Hong,Hyeon, Taeghwan American Chemical Society 2012 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.134 No.25
<P>Multimodal imaging is highly desirable for accurate diagnosis because it can provide complementary information from each imaging modality. In this study, a sol–gel reaction of tantalum(V) ethoxide in a microemulsion containing Fe<SUB>3</SUB>O<SUB>4</SUB> nanoparticles (NPs) was used to synthesize multifunctional Fe<SUB>3</SUB>O<SUB>4</SUB>/TaO<SUB><I>x</I></SUB> core/shell NPs, which were biocompatible and exhibited a prolonged circulation time. When the NPs were intravenously injected, the tumor-associated vessel was observed using computed tomography (CT), and magnetic resonance imaging (MRI) revealed the high and low vascular regions of the tumor.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/2012/jacsat.2012.134.issue-25/ja3016582/production/images/medium/ja-2012-016582_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja3016582'>ACS Electronic Supporting Info</A></P>
Biomineralized N-Doped CNT/TiO<sub>2</sub> Core/Shell Nanowires for Visible Light Photocatalysis
Lee, Won Jun,Lee, Ju Min,Kochuveedu, Saji Thomas,Han, Tae Hee,Jeong, Hu Young,Park, Moonkyu,Yun, Je Moon,Kwon, Joon,No, Kwangsoo,Kim, Dong Ha,Kim, Sang Ouk American Chemical Society 2012 ACS NANO Vol.6 No.1
<P>We report an efficient and environmentally benign biomimetic mineralization of TiO<SUB>2</SUB> at the graphitic carbon surface, which successfully created an ideal TiO<SUB>2</SUB>/carbon hybrid structure without any harsh surface treatment or interfacial adhesive layer. The N-doped sites at carbon nanotubes (CNTs) successfully nucleated the high-yield biomimetic deposition of a uniformly thick TiO<SUB>2</SUB> nanoshell in neutral pH aqueous media at ambient pressure and temperature and generated N-doped CNT (NCNT)/TiO<SUB>2</SUB> core/shell nanowires. Unlike previously known organic biomineralization templates, such as proteins or peptides, the electroconductive and high-temperature-stable NCNT backbone enabled high-temperature thermal treatment and corresponding crystal structure transformation of TiO<SUB>2</SUB> nanoshells into the anatase or rutile phase for optimized material properties. The direct contact of the NCNT surface and TiO<SUB>2</SUB> nanoshell without any adhesive interlayer introduced a new carbon energy level in the TiO<SUB>2</SUB> band gap and thereby effectively lowered the band gap energy. Consequently, the created core/shell nanowires showed a greatly enhanced visible light photocatalysis. Other interesting synergistic properties such as stimuli-responsive wettabilites were also demonstrated.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2012/ancac3.2012.6.issue-1/nn204504h/production/images/medium/nn-2011-04504h_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn204504h'>ACS Electronic Supporting Info</A></P>
혈전 발생의 위험 인자가 없는 환자에서 급성 신우신염에 의해 유발된 신정맥 혈전증 및 폐색전증
이광수,김아름,이승연,정주홍,김미정,이진수,정문현,홍기천,조순구 대한감염학회 2009 감염과 화학요법 Vol.41 No.5
Renal vein thrombosis (RVT) is not an uncommon condition amongst patients with nephrotic syndrome or malignancy. Septic pulmonary embolism (SPE) is associated with risk factors such as intravenous drug use, pelvic thrombophlebitis, and suppurative processes in the head and neck. However, acute pyelonephritis is a rare cause of RVT and SPE. Case reports on RVT and SPE due to acute pyelonephritis are rare. In most of the earlier cases, patients had underlying conditions such as diabetes mellitus, renal carcinoma, calyceal stones, and hyperhomocysteinemia. We report a case of acute pyelonephritis complicated by RVT and SPE that occurred in a patient without any predisposing risk factors for thromboembolism. RVT and SPE were diagnosed using computed tomography and ventilation/perfusion scan. The patient recovered with antibiotics and anticoagulation therapy without any surgical interventions.
Kwangsoo Lee,이준신,손혁주,Hyungjun Park,김재홍,Jeoungin Lee,김경해,Kyungsoo Jang,정성욱 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.6
Thin films of high dielectric constant materials, specifically titanium dioxide, were investigated as potential replacements for silicon dioxide, which is generally used as a blocking layer for nonvolatile memory devices. A silicon-oxynitride layer using nitrous-oxide plasma as a tunneling layer and using titanium-dioxide as a blocking layer was deposited to fabricate nonvolatile memory on rough poly-silicon. Titanium dioxide thin films were deposited using atmospheric pressure chemical vapor deposition and spectroscopic ellipsometry and scanning electron microscopy were used to measure the physical properties. A metal-insulator-semiconductor device was fabricated to measure the current density-electric field and a nonvolatile memory device on glass was fabricated to measure the gate voltage - drain current, drain voltage - drain current and retention characteristics. The leakage current density of the sample deposited at 250℃ was the lowest (1.4 x 10-9A/mm² at 2 MV/cm). The threshold voltage shift of the nonvolatile memory device on glass was 1.6 V and the subthreshold swing (~270 mV/decade based on the maximum slope in the transfer curve) and the on/off current ratio (~10 6) remained nearly constant during the programming/erasing operations.
Direct evidence of void passivation in Cu(InGa)(SSe)<sub>2</sub> absorber layers
Lee, Dongho,Lee, Jaehan,Heo, Sung,Park, Jong-Bong,Kim, Young-Su,Mo, Chan B.,Huh, Kwangsoo,Yang, JungYup,Nam, Junggyu,Baek, Dohyun,Park, Sungchan,Kim, ByoungJune,Kim, Dongseop,Kang, Yoonmook American Institute of Physics 2015 Applied Physics Letters Vol.106 No.8