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RISS 인기검색어
- 검색키워드
- 저자 : Yang Sena (검색결과 34 건)
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Yang, Sena,Lee, Hangil Springer US 2017 NANOSCALE RESEARCH LETTERS Vol.12 No.1
<P>The modified TiO<SUB>2</SUB> nanoparticles (NPs) to enhance their catalytic activities by doping them with the five transition metals (Cr, Mn, Fe, Co, and Ni) have been investigated using various surface analysis techniques such as scanning electron microscopy (SEM), Raman spectroscopy, scanning transmission X-ray microscopy (STXM), and high-resolution photoemission spectroscopy (HRPES). To compare catalytic activities of these transition metal-doped TiO<SUB>2</SUB> nanoparticles (TM-TiO<SUB>2</SUB>) with those of TiO<SUB>2</SUB> NPs, we monitored their performances in the catalytic oxidation of 2-aminothiophenol (2-ATP) by using HRPES and on the oxidation of 2-ATP in aqueous solution by taking electrochemistry (EC) measurements. As a result, we clearly investigate that the increased defect structures induced by the doped transition metal are closely correlated with the enhancement of catalytic activities of TiO<SUB>2</SUB> NPs and confirm that Fe- and Co-doped TiO<SUB>2</SUB> NPs can act as efficient catalysts.</P>
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Yang, Sena,Lim, Heeseon,Park, Eun Hee,Kim, Yaewon,Min, Young Hwan,Lee, Hee-Seung,Kim, Sehun,Lee, Hangil American Chemical Society 2012 The Journal of Physical Chemistry Part C Vol.116 No.49
<P>The discrepancy of geometric configuration between phenylalanine and tyrosine adsorbed on Ge(100) surfaces was investigated using scanning tunneling microscopy (STM) in conjunction with density functional theory (DFT) calculations and core-level photoemission spectroscopy (CLPES). The study focused on the role of nucleophilic group (hydroxyl group) on phenyl ring of tyrosine, and we elucidated the difference of the adsorption geometry between phenylalanine and tyrosine on Ge(100) surfaces. We first confirmed that the “O–H dissociated–N dative bonded structure” was the most favorable structure in both molecules at low coverage by results of CLPES and DFT calculations. Geometric differences for the adsorption configurations between phenylalanine and tyrosine were observed: the phenyl ring of phenylalanine was aligned axially with respect to the Ge(100) surface, whereas that of tyrosine was tilted, as determined by DFT calculations. In sequence, we found out the results of STM images to confirm DFT results. We determined the different geometric configurations are attributed to the nucleophilic hydroxyl group of tyrosine, which creates an uneven charge distribution.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2012/jpccck.2012.116.issue-49/jp3086039/production/images/medium/jp-2012-086039_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp3086039'>ACS Electronic Supporting Info</A></P>
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Thermal annealing of black phosphorus for etching and protection
Yang, Sena,Kim, Ansoon,Park, Jaesung,Kwon, Hyuksang,Lanh, Phung Thi,Hong, Songwoung,Kim, Kyung Joong,Kim, Jeong Won Elsevier 2018 APPLIED SURFACE SCIENCE - Vol.457 No.-
<P><B>Abstract</B></P> <P>Among 2D materials, black phosphorus (BP) with high carrier mobility and a sizable direct bandgap has recently attracted considerable attention for next generation materials. However, one of critical challenges for the applications of BP to electronic or optical devices is its air stability, because it degrades rapidly upon exposure to ambient conditions. Herein, we introduce a simple method to fabricate a stable and thin BP. Upon thermal annealing above 200 °C in air, the stable protection layer of BP oxide is produced at the top of BP surface. Simultaneously, the thermal oxidation of bare BP etches the intrinsic BP layer, resulting in the decrease of BP thickness. By the thermal annealing, the field-effect transistor (FET) shows enhanced device performance of hole mobility by 10 times and on/off ratio by 50 times, compared to bare BP-based FET. The stable performance under ambient condition even without additional passivation is due to BP material stability and removal of surface scattering centres upon thermal annealing process.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A very simple method of thermal annealing to produce stable and thin black phosphorus. </LI> <LI> Upon thermal annealing, a P<SUB>2</SUB>O<SUB>5</SUB>-like protective layer is formed on top of BP flake and eliminates carrier scattering centers. </LI> <LI> The surface protection leads to improve BP-based field-effect transistor (FET) performance. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Yang, Sena,Jeon, Aram,Driver, Russell W.,Kim, Yeonwoo,Jeon, Eun Hee,Kim, Sehun,Lee, Hee-Seung,Lee, Hangil The Royal Society of Chemistry 2016 Physical chemistry chemical physics Vol.18 No.21
<P>We report the formation of both right- and left-handed chiral nanopores within a single domain during the self-assembly of an amino acid derivative on an inert Au(111) surface using STM. DFT calculations employed to rationalize this unusual result identified that intermolecular interactions between chiral, windmill-shaped tetramers are crucial for self-assembly.</P>
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양천수(Yang, Chunsoo),우세나(Woo, Sena) 한국가족법학회 2019 가족법연구 Vol.33 No.2
Paragraph 1 of Article 844 of the Korean Civil Code provides for “presumption of husband’s paternity of child”. According to this, “a child conceived by a wife during the marriage shall be presumed to be the child of the wife’s husband”(Paragraph 1), and the Civil Code makes it possible for this presumption to be reversed only by an “action of denial of paternity”(Article 847). However, criticism has already been raised for the system of “presumption of husband’s paternity of child”. It says that by strictly adhering to the system “presumption of husband’s paternity of child”, many irrational social problems are being caused. For this reason, a lot of theories are trying to admit an exception to the system “presumption of husband’s paternity of child” on various grounds. The judicial case of the Korean Supreme Court also admits an exception to the system “presumption of husband’s paternity of child” according to the “appearance theory”. Furthermore, the Supreme Court is currently discussing whether it is necessary to maintain a precedent on the system “presumption of husband’s paternity of child”. In this context, this article deals with the problem of the system “presumption of husband’s paternity of child” from the point of view of legal philosopy and methodology. At first, this article analyzes the basis of recognition of the system “presumption of husband’s paternity of child” from the perspective of legal philosophy (Ⅱ), and critically examines whether the attitude of civil aw is still valid today (Ⅲ). On this basis, this article criticizes the attitude of the civil law, which strictly adheres to the system “presumption of husband’s paternity of child” in terms of legal policy. However, it is pointed out that there is a problem in recognizing an exception to the system “presumption of husband’s paternity of child” by interpreting Paragraph 1 of Article 844 of the Civil Code (Ⅳ). According to this article, this is not legal interpretation but lawmaking: contra legem interpretation (contra legem Rechtsfortbildung). On this basis, this article argues that the Supreme Court is not allowed to recognize exceptions directly to the system “presumption of husband’s paternity of child” (Ⅴ). It claims to be a matter that the Constitutional Court needs to deal with.
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Confirmation of the coexistence of two tautomers of 2-mercaptothiazoline on the Ge(100) surface
Park, Youngchan,Yang, Sena,Lee, Myungjin,Lim, Heeseon,Kim, Yaewon,Kim, Sehun,Lee, Hangil The Royal Society of Chemistry 2013 Physical chemistry chemical physics Vol.15 No.39
<P>We confirmed the coverage dependent variation of tautomers of 2-mercaptothiazoline (the thiolate and thione forms) adsorbed on the Ge(100) surface under UHV conditions by using HRXPS measurements in conjunction with the DFT calculation method, which was studied before only in aqueous systems. The C 1s, S 2p, and N 1s core-level spectra obtained using HRXPS revealed the simultaneous presence of two distinct adsorption structures in different proportions at both low (0.15 ML) and high (0.65 ML) coverages. Moreover, we modelled the adsorption structures and geometric configurations of the bond states of 2-mercaptothiazoline on the Ge(100) surface by using the DFT calculation method, and found that the S dative bonded structure is the most stable adsorption structure for the thione form of 2-mercaptothiazoline and that the S–H dissociated-N dative bonded structure is the most stable adsorption structure for the thiolate form.</P> <P>Graphic Abstract</P><P>We confirmed the coverage dependent variation of tautomers of 2-mercaptothiazoline (the thiolate and thione forms) adsorbed on the Ge(100) surface under UHV conditions by using HRXPS measurements in conjunction with the DFT calculation method, which was studied before only in aqueous systems. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3cp52760c'> </P>
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