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| 1 | TiO2 nanotube branched tree on a carbon nanofiber nanostructure as an anode for high energy and power lithium ion batteries显示文摘 | Taeseup Song Hyungkyu Han Heechae Choi Jung Woo Lee Hyunjung Park Sangkyu Lee Won II Park Seungchul Kim Li Liu Ungyu Paik | 2014 | Nano Research2014，7，4： | 4 |
| 2 | Metastable Two-Dimensional Materials for Electrocatalytic Energy Conversions显示文摘CONSPECTUS:An urgent need for efficient energy conversion technologies is driving development of active and durable electrocatalysts.In recent years,two-dimensional(2D)materials have emerged as practically promising electrocatalysts because of unique physical and chemical properties.In general,a significant proportion of 2D materials are polymorphous with diverse crystal structures or stoichiometry.However,pristine 2D materials found in nature are thermodynamically stable phases with inert catalytic activity.Metastable phases,in contrast,are highly active for various electrocatalytic processes because of high-energy structures and high reactivity of nonequilibrium surfaces.Generally,the growth of metastable 2D materials requires higher formation energy compared with the thermodynamically stable phases,which are difficultly obtained in standard synthetic processes such as chemical vapor deposition and vapor transport processes.The destabilization of thermodynamically stable 2D materials via external forces facilitates the conversion of highentropy crystal structure into metastable phases.To date,a number of approaches,including confined growth,topotactic transformation,electron donating,and chemical exfoliation,have been demonstrated for the preparation of high-performance metastable 2D electrocatalysts.As an atomic thin platform,metastable 2D materials represent an almost ideal prototype to achieve a comprehensive understanding of the fundamental principles and mechanisms of various electrocatalytic processes.In the design of metastable 2D electrocatalysts,a number of needs must be concomitantly considered,namely,(1)economic of synthesis methods,(2)product yield,(3)applicability of post-treatment for tuning electrocatalytic properties,(4)general synthesis protocols,and(5)the chemical and catalytic stabilities of metastable 2D materials.In this Account,we provide a critical and timely overview of metastable 2D materials for major electrocatalytic energy conversions based on recent research in our group.We review unique advances and challenges with metastable 2D materials,including specific design principles and typical strategies for synthesis of metastable 2D nanostructured materials with desirable characteristics.We compare advances in metastable 2D materials in selected electrocatalytic processes from fundamental through to functional.Significant emphasis is placed on design strategies for metastable 2D materials and resultant influence on intrinsic electrocatalytic performance,including electronic properties and adsorption energetics.We conclude with an appraisal of the likely opportunities and difficulties with metastable 2D electrocatalysts at the atomic level.This Account provides understandings and insights to the research of metastable 2D electrocatalysts.The current achievements of metastable 2D materials with the ultimate target of synthesizing high performance electrocatalysts may facilitate the development of heterogeneous catalysis for clean energy applications. | Huanyu Jin Taeseup Song Ungyu Paik Shi-Zhang Qiao | 2021 | Accounts of Materials Research2021，2，7： | 3 |
| 3 | Effect of particle dispersion on microstructure and strength of reaction-bonded silicon carbide显示文摘 | UNGYU PAIK HYEONCHEOL PARK | 2002 | Materials Science and Engineering2002，334，： | 1 |
| 4 | Consolidation of aqueous concentrated silicon nitride suspension by direct coagulation casting显示文摘 | Jung Yunsung Paik Ungyu Pagnoux Cecile | 2003 | Materials Science and Engineering:A2003，342，1： | 1 |
| 5 | Holographic grating formation in PVB doped polymer dispersed liquid crystal based on PUA显示文摘 | Eun-Hee Kim Yeon-Gil Jung Ungyu Paik | 2009 | Thin Solid Films2009，518，5： | 1 |
| 6 | A study on the phase transition and characteristics of rare earth elements doped BaTiO3显示文摘 | JUNG Yun-sung NA Eun-sang PAIK Ungyu | 2002 | Materials Research Bulletin2002，37，9： | 1 |
| 7 | Effect of particle disper - sion on microstrueture and strength of reaction - bonded silicon carbide 显示文摘 | Ungyu Paik Hyeon- Cheol Park Sung- Churl Choi | 2002 | Mate - rials Science and Engineering2002，334，2002： | 1 |
| 8 | A Study on the Phase Transition and Characteristics of Rare Earth Elements Doped BaTiO3显示文摘 | Eun-Sang Na Ungyu Paik | 2002 | Materials Research Bulletin2002，37，2002： | 1 |
| 9 | The effect of electrostatic repulsive forces on the stability of BaTiO3 particles suspended in non-aqueous media显示文摘 | Jan Mewis Jan Vermant Ungyu Paik | 1998 | Colloids and Surfaces A:Physicochemcial and Engineering Aspects1998，135，： | 1 |
| 10 | Preparation of aluminum oxide particles using ammonium acetate as precipitating agent 显示文摘 | Ji - Young Park Seong - Geun Oh Ungyu Paik | 2002 | Materials Letters2002，56，4： | 1 |
| 11 | Dispersant-binder interactions in aqueoussilicon nitride suspensions显示文摘 | Ungyu P | 1999 | Journal of the Ameri-can Ceramic Society1999，82，4： | 1 |
| 12 | Effect of particle size on gelcasting process and green properties in alumina显示文摘 | Chang-Gi Ha Yeon Gil Jung Jae-Won Kim ChangYong Jo and Ungyu Paik | 2002 | Materials Science and Engineering2002，337，2002： | 1 |
| 13 | Effects of external electrode and heat treatment on stress anisotropy and residual stress in BaTiO3-based Ni-MLCCs显示文摘 | Park Dong-Ho Jung Yeon-Gil Paik Ungyu | 2004 | Mater Sci Forum2004，449，452： | 1 |
| 14 | A study on the phase transition and characteristics of rare earth elements doped BaTiO3显示文摘 | Yun-Sung Jung Eun-Sang Na Ungyu Paik | 2002 | Materials Research Bulletin2002，37，： | 1 |
| 15 | Acid–base interaction between carbon black and polyurethane molecules with different amine values: Dispersion stability of carbon black suspension for use in lithium ion battery cathodes显示文摘 | Ki Chun Kil Gu Yeon Kim Chae-Woong Cho Myung Duk Lim Kijun Kim Kyung-Min Jeong Jinuk Lee Ungyu Paik | 2013 | Electrochimica Acta2013，，： | 1 |
| 16 | A study on the transition and characteristics of rare earth elements doped BaTiO3 显示文摘 | Jung Yun-Sung Na Eun-Sang Paik Ungyu Lee Jinha Kim Jonghee | 2002 | Materials Research Bulletin2002，37，9： | 1 |
| 17 | Optical Properties of Laterally Aligned Si Nanowires for Transparent Electronics Applications显示文摘我们调查了 nanowire (SiNW ) 穿以便在透明电子学探索他们的潜在的适用性的旁边地排列的 Si 的光性质。SiNW 数组展出了好光透明性在可见光谱每 10 m 为 2025 的 NW 密度与 90% 的发射度变化。另外,极化依赖者大小在取决于在事件光和 NW 轴的极化之间的角度的 80%95% 的范围在发射度揭示了一个变化。用 SiNWs,我们证明透明晶体管展出好光透明性(比 80% 大) 并且显示出的典型 p 类型 SiNW 晶体管特征。 | Dong Hyun Lee Jaeseok Yi Won Woo Lee Ungyu Paik John A. Rogers Won II Park | 2011 | Nano Research2011，4，9： | 0 |
| 18 | Nanotopography Impact in Shallow Trench Isolation Chemical Mechanical Polishing-Dependence on Slurry Characteristics显示文摘The nanotopography of the surface of silicon wafers has become an important issue in ULSI device manufacturing since it affects the post-chemical mechanical polishing (post-CMP) uniformity of the thickness deviation of dielectric films. In this study, the nanotopography impact was investigated in terms of its dependence on the characteristics of ceriabased slurries, such as the abrasive size, the grain size of the polycrystalline abrasive and the surfactant added to the slurry. It was found that the magnitude of the post-CMP oxide thickness deviation due to nanotopography increased with the surfactant concentration in the case of smaller abrasives but was almost independent of the concentration in the case of larger abrasives. The grain size of the polycrystalline abrasive did not affect the nanotopography impact. | Jea-Gun Park Takeo Katoh Ungyu Paik | 2004 | Journal of Rare Earths2004，22，z2： | 0 |
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