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Work function engineering of SnO single crystal microplates with thermal annealing
Doh, Won Hui,Jeong, Wooseok,Lee, Hyunsoo,Park, Jonghyurk,Park, Jeong Young IOP 2016 Nanotechnology Vol.27 No.33
<P>We synthesized black SnO single-crystal microplates via a sonochemical process and engineered the work function of the SnO microplates using thermal treatments. The as-synthesized SnO microplates have a wide (001) plane, as is clearly evident from TEM images and diffraction patterns. Surface potential measurements on the SnO microplates show that the work function changes as the annealing temperature increases. The TEM and XAS results after thermal treatments imply that the micro-sized SnO(001) single-crystals are stable up to about 400 °C in air, after which the surface starts to become locally oxidized. Consequently, the long-range ordering and lattice parameter of the SnO(001) single crystals started to change to make polycrystalline SnO<SUB>2</SUB> at about 600 °C. These results demonstrate the ability to tune the work function of the microplates and suggest an intriguing way to engineer the electrical properties of nanostructures.</P>
Adsorption Configuration Changes and Reactions of N<sub>2</sub>O on V(110) between 80 and 200 K
Doh, Won Hui,Jeong, Hyun Suck,Kim, Chang Min The Chemical Society of Japan 2010 Chemistry letters Vol.39 No.5
<P>Adsorption and reactions of N<SUB>2</SUB>O on V(110) have been investigated. The N<SUB>2</SUB>O molecule is adsorbed on V(110) through the terminal nitrogen atom at 80 K. The molecular axis of N<SUB>2</SUB>O is tilted from the surface, and the tilt angle is greater than 55°. The adsorption configuration of N<SUB>2</SUB>O changes in the temperature range of 80 to 120 K, and decomposition of N<SUB>2</SUB>O takes place to produce N<SUB>2</SUB>.</P>
중국인 학습자를 위한 한국어 연어 정보 기술 방안 -한중학습사전 개발을 위한 시고-
도원영 ( Won Young Doh ),범기혜 ( Qi Hui Ban ) 경희대학교 인문학연구원 2012 인문학연구 Vol.0 No.22
본고는 한중학습사전에서 연어 정보를 기술하는 방안을 제시하는 데 목적을 두고 있다. 먼저 그간의 연구에서 연어의 개념과 범위를 정리한 뒤 중국인 학습자를 위한 사전의 연어 처리 방식을 검토한 결과 한국어 학습에 필요한 만큼 연어를 제시하지 못했다는 점, 중국인 학습자를 고려한 연어 대역에 대한 고려가 없었다는 점 등을 지적하였다. 이에 본고는 중국인을 위한 한국어 학습 사전에 연어항을 두어야 함을 주장하고 주술 관계, 목술 관계, 부술 관계, 수식 관계의 연어를 연어항에 제시하는 원칙을 설정하였다. 중국인 학습자가 한국어의 연어 정보를 제1언어인 중국어를 통해 이해할 수 있도록 정확한 대역 표현을 찾는 방안도 제안하였다. 한국어 연어와 중국어 대역 표현 간의 공통점과 차이점을 분석해 내어 대응형과 비대응형으로 나누어 설명하였다. 한국어의 연어에 관한 용법을 정확히 학습하도록 용례 선정의 원칙에 대해서도 언급하였다. This study aims to suggest how to describe collocation information on Korean learner`s dictionary for Chinese speakers. For this purpose, we arranged the concept of collocation and its scope, and pointed out some problems from the earlier researches and the existing dictionaries; a lack of collocation information, no consideration of Chinese target word on Korean collocation, etc. Accordingly, we argued that it is in need of the collocation section in Korean-Chinese dictionary and established the rules on presenting the collocation information in the collocation section. Then we suggested the lexicographical methods to present the Chinese equivalent for the Korean collocation and to select examples which corresponding with the usage of the collocations.
Kim, Yongman,Doh, Won Hui,Kim, Jeongjin,Park, Jeong Young American Chemical Society 2018 Langmuir Vol.34 No.21
<P>Porphyrin-derived molecules have received much attention for use in solar energy conversion devices, such as artificial leaves and dye-sensitized solar cells. Because of their technological importance, a molecular-level understanding of the mechanism for supramolecular structure formation in a liquid, as well as their stability under ultraviolet (UV) irradiation, is important. Here, we observed the self-assembled structure of free-base, copper(II), and nickel(II) octaethylporphyrin formed on Au(111) in a dodecane solution using scanning tunneling microscopy (STM). As evident in the STM images, the self-assembled monolayers (SAMs) of these three porphyrins on the Au(111) surface showed hexagonal close-packed structures when in dodecane solution. Under UV irradiation (λ = 365 nm), the porphyrin molecules in the SAM or the dodecane solution move extensively and form new porphyrin clusters on the Au sites that have a high degree of freedom. Consequently, the Au(111) surface was covered with disordered porphyrin clusters. However, we found that the porphyrin molecules decomposed under UV irradiation at 254 nm. Molecular-scale observation of the morphological evolution of the porphyrin SAM under UV irradiation can provide a fundamental understanding of the degradation processes of porphyrin-based energy conversion devices.</P> [FIG OMISSION]</BR>
Interaction of Methanol and Hydrogen on a ZnO (0001) Single Crystal Surface
Roy, Probir C.,Doh, Won Hui,Jo, Sam K.,Kim, Chang Min American Chemical Society 2013 JOURNAL OF PHYSICAL CHEMISTRY C - Vol.117 No.29
<P>Thermal reactions of CH<SUB>3</SUB>OH on a ZnO (0001) surface with and without coadsorbed atomic hydrogen have been investigated using a temperature-programmed desorption (TPD) technique. Both H<SUB>2</SUB> and CH<SUB>2</SUB>O desorb at 510 and 580 K during CH<SUB>3</SUB>OH decomposition on ZnO(0001). When H atoms are adsorbed on ZnO(0001), the recombinative desorption of H<SUB>2</SUB> takes place at around 450 K. In the process of CH<SUB>3</SUB>OH decomposition on ZnO(0001), H<SUB>2</SUB> desorption is not observed until the surface temperature reaches 510 K. These observations indicate that surface-bound H atoms are not produced up to 510 K. When CD<SUB>3</SUB>OD and H are coadsorbed, the desorption of both H<SUB>2</SUB> and HD is observed at 445 K. HD should be formed by the exchange reaction between CD<SUB>3</SUB>O–D and H on the surface, which indicates that the CD<SUB>3</SUB>O–D bond is partially broken to form an associative CD<SUB>3</SUB>···D complex. We suggest two different pathways for the formation of CH<SUB>2</SUB>O from CH<SUB>3</SUB>OH on ZnO(0001). At 510 K, CH<SUB>2</SUB>O and H<SUB>2</SUB> are formed from the surface reaction of CH<SUB>3</SUB>O and H. Desorption of CH<SUB>2</SUB>O at 580 K is related to the complete decomposition of CH<SUB>3</SUB>O.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2013/jpccck.2013.117.issue-29/jp403913h/production/images/medium/jp-2013-03913h_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp403913h'>ACS Electronic Supporting Info</A></P>