排序方式: 共有29条查询结果,搜索用时 15 毫秒
1.
Juyeol Lee Jihun Kang Sukhyun Lee Young Ho Rhee 《Angewandte Chemie (International ed. in English)》2020,59(6):2349-2353
A de novo first collective total synthesis of 11‐deoxylandomycins is reported. A signature step is featured by the Pd‐catalyzed asymmetric addition of alcohol to ene‐alkoxyallenes that assembles oligomeric 2,3,6‐trideoxyoligosaccharides. The unique feature of the protocol is illustrated by a flexible access to various natural 11‐deoxylandomycins as well as non‐natural analogues. 相似文献
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We study the potential density of rational points on double solids ramified along singular reduced sextic surfaces. Also, we investigate elliptic fibration structures on nonsingular sextic double solids defined over a perfect field of characteristic 5. 相似文献
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We fabricated the photoelectrochemical (PEC) cells using n-type TiO2 and metal (Pt, Pd)-decorated carbon nanotubes (CNTs) as an anode and a cathode, respectively. Photovoltaic effects were clearly observed. Compared with conventional PEC cell with Pt cathode, a larger photo-voltage was found in the PEC cells with the metal-decorated CNT cathode due to p-type semiconducting properties of CNTs. Additionally, we connected two PEC cells in series to decompose water into oxygen and hydrogen. Indeed, the connected PEC cells yielded the photo-voltage of about 1.35 V, which is larger than 1.23 V required for water splitting. This result demonstrates the possibility of hydrogen generation using the connected PEC cells without an external bias. 相似文献
4.
Park Jaeseo Mun Jihun Shin Jae-Soo Kim Jongho Park Hee Jung Kang Sang-Woo 《Journal of nanoparticle research》2017,19(2):1-12
Journal of Nanoparticle Research - Transparent superhydrophobic coatings, which are highly desired for the protection of material surfaces, have been limited to particular kinds of materials, e.g.... 相似文献
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Mangesh S. Diware Kyunam Park Jihun Mun Han Gyeol Park Won Chegal Yong Jai Cho Hyun Mo Cho Jusang Park Hyungjun Kim Sang-Woo Kang Young Dong Kim 《Current Applied Physics》2017,17(10):1329-1334
Here, we present the spectroscopic ellipsometry investigation of synthetically grown wafer-scale two-dimensional (2D) MoS2 and WSe2 films to access quality and thickness uniformity. MoS2 and WSe2 samples were grown by chemical vapor deposition and atomic layer deposition, respectively. Complex dielectric function () and thickness information of these 2D films were extracted from the measured data using multilayer optical calculations. Broad spectral range (1.2–6 eV) and multiple angles of incidence were used to reduce correlations among fitting parameter. Lineshape of ε of MoS2 and WSe2 monolayer films are consistent with literature but shows higher values, suggests better quality of our samples. Eight-inch wafer size MoS2 monolayer sample shows ~ 70% uniformity with an average thickness of 0.65 ± 0.2 nm, and three-layer WSe2 sample of 8 × 1 cm2 area shows ~ 80% uniformity with an average thickness of 2.5 ± 0.4 nm. Our results will be helpful to accelerate commercialization process of 2D devices. 相似文献
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Tae Kyu An Sang Hun Jang Seul‐Ong Kim Jaeyoung Jang Jihun Hwang Hyojung Cha Young Ri Noh Soon Byung Yoon Yong Jin Yoon Lae Ho Kim Prof. Dae Sung Chung Prof. Soon‐Ki Kwon Prof. Yun‐Hi Kim Prof. Sang‐Gyeong Lee Prof. Chan Eon Park 《Chemistry (Weinheim an der Bergstrasse, Germany)》2013,19(42):14052-14060
A series of three thiophene–naphthalene‐based asymmetric oligomers—5‐decyl‐2,2′:5′,2′′:5′′,2′′′‐quaterthiophene (DtT), 5‐decyl‐5′′‐(naphthalen‐2‐yl)‐2,2′:5′,2′′‐terthiophene (D3TN), and 5‐(4‐decylphenyl)‐5′‐(naphthalen‐2‐yl)‐2,2′‐bithiophene (DP2TN)—was synthesized by Suzuki cross‐coupling reactions. The long alkyl side chains improved both the solubility of the oligomers in solvents and their tendency to self‐assemble. UV/Vis absorption measurements suggested that DtT, D3TN, and DP2TN form H‐type aggregates with a face‐to‐face packing structure. In addition, the three oligomers were found to adopt vertically aligned crystalline structures in films deposited on substrates, as revealed by grazing‐incidence wide‐angle X‐ray scattering. These oligomers were used as the active layers of p‐type organic field‐effect transistors, and the resulting devices showed field‐effect mobilities of 3.3×10?3 cm2 V?1 s?1 for DtT, 1.6×10?2 cm2 V?1 s?1 for D3TN, and 3.7×10?2 cm2 V?1 s?1 for DP2TN. The differences in transistor performances were attributed to the degree of π overlap and the morphological differences determined by the molecular structures. 相似文献
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Chung KH Park J Kim KY Yoon JK Kim H Han S Kahng SJ 《Chemical communications (Cambridge, England)》2011,47(41):11492-11494
Intermolecular structures of porous two-dimensional supramolecular networks are studied using scanning tunnelling microscopy combined with density functional theory calculations. The local configurations of halogen bonds in polymorphic porous supramolecular networks are directly visualized in support of previous bulk crystal studies. 相似文献
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On a general quasismooth well-formed weighted hypersurface of degree Σ
i=14
a
i
in ℙ(1, a
1, a
2, a
3, a
4), we classify all pencils whose general members are surfaces of Kodaira dimension zero.
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