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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
Ammonia-based plasma treatment of single-walled carbon nanotube thin films for bio-immobilization
Lee, Jaemin,Efremov, Alexander,Son, Ryeo Gang,Pack, Seung Pil,Lee, Hyun Woo,Kim, Kwangsoo,Kwon, Kwang-Ho Elsevier 2016 Carbon Vol.105 No.-
<P>The bio-immobilization efficiency of single-walled carbon nanotube (SWCNT) thin films treated in NH3/Ar/N-2 inductively coupled plasmas with different Ar/N-2 gas mixing ratios was studied. The plasma parameters as well as the densities and fluxes of the plasma active species were controlled using both plasma diagnostics (Langmuir probes, optical emission spectroscopy) and modeling. The surface morphology of the SWCNT thin films was observed by field-emission scanning electron microscopy (FE-SEM). The structural changes on the treated surfaces were detected by Raman spectroscopy. The changes in atomic composition for plasma-treated and pristine SWCNT film surfaces were analyzed by X-ray photoelectron spectroscopy (XPS). Fluorescence analysis of the plasma-functionalized SWCNT surfaces was performed with green fluorescent proteins (GFPs). It was found that the transition from NH3/Ar to NH3/N-2 gas system at other constant processing conditions resulted in increasing the CNT surface roughness, the degree of structural defects, the number of NH2-functional groups connected to the CNT surface and the bio-immobilization capability. It was proposed that all these effects are connected to the chemical etching and modification of SWCNTs due to the increased flux of NHx (x < 3) species. (C) 2016 Elsevier Ltd. All rights reserved.</P>
Lee, Hyebin,Kim, Kwangsoo,Woo, Jongmin,Park, Joonho,Kim, Hyeyoon,Lee, Kyung Eun,Kim, Hyeyeon,Kim, Youngsoo,Moon, Kyung Chul,Kim, Ji Young,Park, In Ae,Shim, Bo Bae,Moon, Ji Hye,Han, Dohyun,Ryu, Han Suk American Society for Biochemistry and Molecular Bi 2018 Molecular and Cellular Proteomics Vol.17 No.9
<P>Cytological examination of urine is the most widely used noninvasive pathologic screen for bladder urothelial carcinoma (BLCA); however, inadequate diagnostic accuracy remains a major challenge. We performed mass spectrometry-based proteomic analysis of urine samples of ten patients with BLCA and ten paired patients with benign urothelial lesion (BUL) to identify ancillary proteomic markers for use in liquid-based cytology (LBC). A total of 4,839 proteins were identified and 112 proteins were confirmed as expressed at significantly different levels between the two groups. We also performed an independent proteomic profiling of tumor tissue samples where we identified 7,916 proteins of which 758 were differentially expressed. Cross-platform comparisons of these data with comparative mRNA expression profiles from The Cancer Genome Atlas identified four putative candidate proteins, AHNAK, EPPK1, MYH14 and OLFM4. To determine their immunocytochemical expression levels in LBC, we examined protein expression data from The Human Protein Atlas and in-house FFPE samples. We further investigated the expression of the four candidate proteins in urine cytology samples from two independent validation cohorts. These analyses revealed AHNAK as a unique intracellular protein differing in immunohistochemical expression and subcellular localization between tumor and non-tumor cells. In conclusion, this study identified a new biomarker, AHNAK, applicable to discrimination between BLCA and BUL by LBC. To our knowledge, the present study provides the first identification of a clinical biomarker for LBC based on in-depth proteomics.</P>
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.
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>
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>
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>