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RISS 인기검색어
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- 저자 : Jeon Hyeong-Tak (검색결과 20 건)
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전형탁,Jeon, Hyeong-Tak 한국과학기술단체총연합회 1997 과학과 기술 Vol.30 No.12
지난 10월 20일~24일 미국의 서부 산호세에서 열린 미국진공학회 학술대회에 4명의 대학원생과 함께 참석하여 2편의 논문을 발표한 한양대 금속공학과 전형탁교수의 학술대회 참관기를 싣는다.
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전형탁,Jeon, Hyeong-Tak,Nemanich, R.J. 한국재료학회 1994 한국재료학회지 Vol.4 No.2
Epitaxial TiSiz films have been grown by UHV deposition of Ti on atomically clean Si(ll1)- orientated substrates. The Ti film of 50$\AA$ was deposited on the reconstructed Si(ll1) surface at room temperature. The sample was annealed up to $800^{\circ}C$ in $100^{\circ}C$ increments. The structure of the TiSiL films have been identified as the C49 metastable phase by electron diffraction patterns. Scanning electron microscopy( SEM) shows three different types of Tiksilicide island morphologies. The individual island structures are single crystal and are considered to be epitaxy with different crystallographic orientations. The orientational relationships of the $TiSi_{2}$ islands is given by [ 172 1 C49 $TiSi_{2}$//[110] Si and (021) C49 $TiSi_{2}$// (111)Si.
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Jang, Inae,Jeon, Aeran,Lim, Suk Gyu,Hong, Duk Ki,Kim, Min Soo,Jo, Jae Hyeong,Lee, Sang Tak,Moon, Bongjin,Oh, Han Bin Springer New York LLC 2019 Journal of the American Society for Mass Spectrome Vol.30 No.3
<P>Free radical-initiated peptide sequencing mass spectrometry (FRIPS MS) was employed to analyze a number of representative singly or doubly protonated phosphopeptides (phosphoserine and phosphotyrosine peptides) in positive ion mode. In contrast to collision-activated dissociation (CAD) results, a loss of a phosphate group occurred to a limited degree for both phosphoserine and phosphotyrosine peptides, and thus, localization of a phosphorylated site was readily achieved. Considering that FRIPS MS supplies a substantial amount of collisional energy to peptides, this result was quite unexpected because a labile phosphate group was conserved. Analysis of the resulting peptide fragments revealed the extensive production of <I>a</I>-, <I>c</I>-, <I>x</I>-, and <I>z</I>-type fragments (with some minor <I>b</I>- and <I>y</I>-type fragments), suggesting that radical-driven peptide fragmentation was the primary mechanism involved in the FRIPS MS of phosphopeptides. Results of this study clearly indicate that FRIPS MS is a promising tool for the characterization of post-translational modifications such as phosphorylation.</P> [FIG OMISSION]</BR>
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금속 불순물 Ca이 Si 기판의 표면 미세 거칠기에 미치는 영향
최형석,전형탁,Choe, Hyeong-Seok,Jeon, Hyeong-Tak 한국재료학회 1999 한국재료학회지 Vol.9 No.5
In this study, we focus on Ca contaminant which affects on the roughness Si substrate after thermal process. The initial Si substrates were contaminated intentionally by using a standard Ca solution. The contamination levels of Ca impurity were measured by TXRF and the chemical composition of that was analyzed by AES. Then we gre the thermal oxide to investigate the effect of Ca contaminants. The microroughness of the Si surface, the thermal oxide surface, and the surface after removing the thermal oxide were measured to examine the electrical characteristics. The initial substrates that were contaminated with the standard solution of Ca exhibited the contamination levels of 10\ulcorner~10\ulcorneratoms/$\textrm{cm}^2$ which was measured by TXRF. The Ca contaminants were detected by AES and exhibited the peaks of Ca, SI, C and O.After intentional contamination, the surface microroughness of this initial substrate was increased from $1.5\AA$ to 4$\AA$ as contamination levels became higher. The microroughness of the thermal oxide surfaces of both contaminated and bare Si substrates exhibits similar values. But the microroughness of the contaminated$ Si/SiO_2$ interface was increased as contamination increased. The thermal oxide of contaminated substrate exhibited the small minority carrier diffusion length, low breakdown voltage, and slightly high leakage current.
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전형탁,강응렬,조윤성,Jeon, Hyeong-Tak,Gang, Eung-Ryeol,Jo, Yun-Seong 한국재료학회 1994 한국재료학회지 Vol.4 No.8
The characteristics of gate oxide significantly depend on the last chemical solution used in cleaning process. The standard RCA, HF-last, SC1-last, and HF-only processes are the pre-gate oxide cleaning processes utilized in this experiment. Cleaning process was followed by thermal oxidation in oxidation furnace at $900^{\circ}C$. A 100$\AA$ gate oxide was grown and characterized with using lifetime detector, VPD AAS, SIMS, TEM, and AFM. The results of HF-last and HF-only were shown to be very effective to remove the metallic impurities. And these two splits also showed long minority carrier lifetimes. The surface and interface morphologies of the oxide were examined with AFM and TEM. The rough surface morphologies were observed with the cleaning splits containing the SC1 solution. The smooth surface and interface was observed with the HF-only cleaning process.
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Lee, Kyung-Eun,Jeon, Hyeong-Tak,Han, Sam-Yong,Ham, Jungyeob,Kim, Yong-Joo,Lee, Soon W. Royal Society of Chemistry 2009 Dalton Transactions Vol.2009 No.33
<P>Cyclopalladated azido dimers having various <I>C</I>,<I>N</I>-donor ligands, [Pd(μ-N<SUB>3</SUB>)(<I>C</I>,<I>N</I>-L<SUP><I>n</I></SUP>)]<SUB>2</SUB> (L<SUP>1</SUP>H = 2-(2′-thienyl)pyridine; L<SUP>2</SUP>H = azobenzene; L<SUP>3</SUP>H = 3,3′-dimethylazobenzene; L<SUP>4</SUP>H = <I>N</I>,<I>N′</I>-dimethylbenzylamine; L<SUP>5</SUP>H = 2-phenylpyridine), underwent cleavage with tertiary (or chelating) phosphines to form the cyclopalladated [Pd(N<SUB>3</SUB>)(PR<SUB>3</SUB>)(<I>C</I>,<I>N</I>-L)], the σ-bonded [Pd(N<SUB>3</SUB>)(PR<SUB>3</SUB>)<SUB>2</SUB>(<I>C</I>-L)], or the dinuclear-cyclopalladated [PdN<SUB>3</SUB>(PR<SUB>3</SUB>)(<I>C</I>,<I>N</I>-L)]<SUB>2</SUB>(μ-P∼P) complexes. In particular, treating [Pd(μ-N<SUB>3</SUB>)(<I>C</I>,<I>N</I>-L)]<SUB>2</SUB> with the basic chelating phosphine (depe or dmpe) produced the homoleptic bis(chelating) complex [Pd(<I>C</I>,<I>N</I>-L<SUP><I>n</I></SUP>)<SUB>2</SUB>] (<I>n</I> = 1–3). Complex [Pd(N<SUB>3</SUB>)(PR<SUB>3</SUB>)(<I>C</I>,<I>N</I>-L<SUP>4</SUP>)] or [Pd(N<SUB>3</SUB>)(PR<SUB>3</SUB>)<SUB>2</SUB>(<I>C</I>-L<SUP>4</SUP>)] reacted with aryl isocyanides to selectively give the imidoyl [Pd(N<SUB>3</SUB>)(–C&z.dbd;N–Ar)(PR<SUB>3</SUB>)(<I>N</I>-L<SUP>4</SUP>)] or the imidoyl carbodiimido complex [Pd(N&z.dbd;C&z.dbd;N–Ar)(–C&z.dbd;N–Ar)(PR<SUB>3</SUB>)(<I>N</I>-L<SUP>4</SUP>)], which was formed by the CN–Ar insertion into the orthometallated Pd–C bond on the phenyl moiety or the interaction into the Pd–N<SUB>3</SUB> bond of the supporting ligand. In addition, reactions of [Pd(N<SUB>3</SUB>)(PR<SUB>3</SUB>)<SUB>2</SUB>(<I>C</I>-L<SUP><I>n</I></SUP>)] (<I>n</I> = 1, 2, 4) with R–NCS {R = <I>i</I>-Pr, C<SUB>6</SUB>H<SUB>4</SUB>–NCS, (CH<SUB>3</SUB>)<SUB>3</SUB>Si} gave the <I>S</I>-coordinated tetrazole–thiolato Pd(<SMALL>II</SMALL>) complexes. Finally, the catalytic activity of the cyclopalladated azido complexes was evaluated.</P> <P>Graphic Abstract</P><P>Various cyclopalladated azido complexes containing <I>C</I>,<I>N</I>-donor ligands were prepared and their chemical reactivities were examined. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b907324h'> </P>
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Lee, Jung‐,Hyun,Jeon, Hyeong‐,Tak,Kim, Yong‐,Joo,Lee, Kyung‐,Eun,Ok Jang, Young,Lee, Soon W. WILEY‐VCH Verlag 2011 European journal of inorganic chemistry Vol.2011 No.11
<P><B>Abstract</B></P><P>Novel heteroleptic Pd<SUP>0</SUP> complexes with an N‐heterocyclic carbene (NHC) ligand [(Me<SUB>3</SUB>P)Pd(NHC)] (NHC = IPr, <B>1</B>; SIPr, <B>2</B>) were obtained from [Pd(CH<SUB>2</SUB>=CHPh)(PMe<SUB>3</SUB>)<SUB>2</SUB>] and an equivalent of NHC [NHC = 1,3‐bis(2,6‐diisopropylphenyl)imidazol‐2‐ylidene (IPr) or 1,3‐bis(2,6‐diisopropylphenyl)‐4,5‐dihydroimidazol‐2‐ylidene (SIPr)]. Further treatments of complexes <B>1</B> and <B>2</B> with an additional equimolar NHCafforded the corresponding bis(NHC)–Pd<SUP>0</SUP> complexes [Pd(NHC)<SUB>2</SUB>] (NHC = IPr, <B>3</B>; SIPr, <B>4</B>). Complexes <B>1</B>–<B>4</B> readily reacted with dichloromethane or chloroform to give C–Cl oxidative addition products. In addition, the reactivity of complex <B>2</B> toward other organic halides such as bromobenzene, <I>trans</I>‐1,2‐dichloroethylene, and 5,5′‐dibromo‐2,2′‐bithiophene to produce the corresponding oxidative addition products was investigated. Finally, the ligand replacement of complex <B>1</B> with a chelating phosphane was examined.</P>
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Kim, Yong-Joo,Lee, Kyung-Eun,Jeon, Hyeong-Tak,Huh, Hyun Sue,Lee, Soon W. Elsevier 2008 Inorganica chimica acta Vol.361 No.7
<P><B>Graphical abstract</B></P><P>Bis(phosphine) Pd–azido complexes containing heterocycles such as tetrazolyl, pyrazinyl, and thienyl groups reacted with aryl isocyanides to give the corresponding Pd–carbodiimido or –imidoyl carbodiimido complexes. These products were formed by the insertion of the isocyanides into the Pd–N (azido) or the Pd–C (heterocycles) bond.</P><ce:figure></ce:figure> <P><B>Abstract</B></P><P>Bis(phosphine) Pd–azido complexes containing heterocycles such as tetrazolyl, pyrazinyl, and thienyl groups reacted with aryl isocyanides to give the corresponding Pd–carbodiimido or –imidoyl carbodiimido complexes. These products were formed by the insertion of the isocyanides into the Pd–N (azido) or the Pd–C (heterocycles) bond.</P>
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