Applied Science and Convergence Technology最新文献

{"title":"Characterization of SiO2 Over Poly-Si Mask Etching in Ar/C4F8 Capacitively Coupled Plasma","authors":"Inho Seong, Jangjae Lee, C. Cho, Yeong-Seok Lee, S. Kim, S. You","doi":"10.5757/asct.2021.30.6.176","DOIUrl":"https://doi.org/10.5757/asct.2021.30.6.176","url":null,"abstract":"","PeriodicalId":8223,"journal":{"name":"Applied Science and Convergence Technology","volume":"33 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2021-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85539974","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Temperature-Dependence Study on the Hydrogen Transport Properties of Polymers Used for Hydrogen Infrastructure","authors":"J. Jang, Chunjoong Kim, Nak-Kwan Chung","doi":"10.5757/asct.2021.30.6.163","DOIUrl":"https://doi.org/10.5757/asct.2021.30.6.163","url":null,"abstract":"Polymeric materials used in hydrogen infrastructure degrade with temperature changes, thereby increasing the risk of hydrogen leakage. Therefore, it is essential to evaluate the hydrogen permeation characteristics at varying temperatures, particularly at low temperatures, for the safe use of hydrogen energy. This study aimed to measure hydrogen permeability at a temperature range of 243–313 K for exploring the hydrogen permeation characteristics according to the temperature of ethylene-propylene diene monomer (EPDM), fluorine-rubber (FKM), and nitrilebutadiene rubber (NBR) for hydrogen infrastructure. Results show that permeability and diffusivity rapidly decreased as the temperature decreased; however, there was no significant change in solubility with the variation in temperature. Activation energies of permeability, diffusivity, and solubility were calculated from the measurement results, among which the activation energy for permeability exhibited the largest value in the order of FKM, NBR, and EPDM.","PeriodicalId":8223,"journal":{"name":"Applied Science and Convergence Technology","volume":"29 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2021-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86269765","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Combination of Vacuum and Solution Processes for Stable Indoor Organic Solar Cell under LED Illumination","authors":"Yongju Lee, S. Biswas, Hyeok Kim","doi":"10.5757/asct.2021.30.6.159","DOIUrl":"https://doi.org/10.5757/asct.2021.30.6.159","url":null,"abstract":"The use of tiny, micro-powered electronic devices in indoor environments is increasing daily. The demand for high-performing organic photo- voltaics (OPVs) to power these devices has been rapidly growing because OPVs have favorable absorption properties for indoor environments, excellent mechanical flexibility, and other advantageous attributes. Recently, inexpensive, less acidic, and water-processable polyaniline:poly (4-styrenesulfonic acid) (PANI:PSS) was shown to deliver remarkably high performance as the hole transport layer (HTL) in an indoor OPV device with poly(3-hexylthiophene): indene-C60 bisadduct as the active layer. However, PANI:PSS has not been tested in combination with other active materials, although its universal applicability is of key importance for its commercialization. Thus, we tested the potentiality of using PANI:PSS as the HTL of a highly suitable active material, poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b’]dithiophene-2,6-diyl][3-fluoro-2- [(2-ethylhexyl-l)carbonyl]thieno[3,4-b]thiophendiyl]:phenyl-C70-butyric acid methyl ester (PTB7:PC 70 BM) in an OPV device under an LED lamp. The results reveal that the OPV device based on the PANI:PSS HTL and PTB7:PC 70 BM as the active material has high efficiency (11.80%) and a maximum power density of 42.5 𝜇 W/cm 2 under a 1,000 lx LED.","PeriodicalId":8223,"journal":{"name":"Applied Science and Convergence Technology","volume":"1 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2021-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80525417","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical Analysis of Thermal Flow Characteristics Inside Waste Combustion Chamber with Multiple Thermal Plasma Jets","authors":"Hyeokjun Kang, Jeong-Hwan Oh, Daeun Choi, H. Takana, Sooseok Choi","doi":"10.5757/asct.2021.30.6.172","DOIUrl":"https://doi.org/10.5757/asct.2021.30.6.172","url":null,"abstract":"","PeriodicalId":8223,"journal":{"name":"Applied Science and Convergence Technology","volume":"73 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2021-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80025095","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Detection of Carbon Dioxide Using Cucurbit[6]uril-Functionalized Gold Nanorod Gas Sensor Based on Localized Surface Plasmon Resonance","authors":"Seongjae Jo, Jinyeong Kim, Yejin Kim, Oh Seok Kwon","doi":"10.5757/asct.2021.30.5.186","DOIUrl":"https://doi.org/10.5757/asct.2021.30.5.186","url":null,"abstract":"Owing to rapid climate change and increasingly stringent carbon regulations, carbon dioxide detection is becoming more important. In this study, we fabricate a cucurbit[6]uril-functionalized gold nanorod-based localized surface plasmon resonance (LSPR) gas sensor to detect carbon dioxide. The gold nanorods provide a high refractive index unit that enables the measurement of gas molecules with low molecular weights, while cucurbit[6]uril is a chemical receptor that binds to carbon dioxide owing to its structural characteristics. Therefore, cucurbit[6]uril was functionalized through direct adhesion on the surface of gold nanorods, which was replaced with citrate. The manufactured sensor can detect the presence of carbon dioxide at a maximum concentration of 400 ppm in the atmosphere. The high potential applicability of the cucurbit[6]uril-applied LSPR gas sensors is demonstrated in this study.","PeriodicalId":8223,"journal":{"name":"Applied Science and Convergence Technology","volume":"11 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2021-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88561834","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spin-Orbit-Entangled Nature of Magnetic Moments and Kitaev Magnetism in Layered Halides","authors":"Heung-Sik Kim","doi":"10.5757/ASCT.2021.30.6.191","DOIUrl":"https://doi.org/10.5757/ASCT.2021.30.6.191","url":null,"abstract":"$alpha$-RuCl$_3$ has been extensively studied recently because of potential bond-dependent Kitaev magnetic exchange interactions and the resulting quantum spin liquid phase that can be realized therein. It has been known that the covalency between Ru 4$d$- and Cl $p$-orbitals is crucial to induce large Kitaev interactions in this compound, therefore replacing Cl into heavier halogen elements such as Br or I can be a promising way to promote the Kitaev interaction even further. In a timely manner, there have been reports on synthesis of $alpha$-RuBr$_3$ and $alpha$-RuI$_3$, which are expected to host the same spin-orbit-entangled orbitals and Kitaev exchange interactions with $alpha$-RuCl$_3$. Here in this work we investigate electronic structures of $alpha$-RuCl$_3$, $alpha$-RuBr$_3$, and $alpha$-RuI$_3$ in a comparative fashion, focusing on the cooperation of the spin-orbit coupling and on-site Coulomb repulsions to realize the spin-orbit-entangled pseudospin-1/2 at Ru sites. We further estimate magnetic exchange interactions of all three compounds, showing that $alpha$-RuBr$_3$ can be promising candidates to realize Kitaev spin liquid phases in solid-state systems.","PeriodicalId":8223,"journal":{"name":"Applied Science and Convergence Technology","volume":"37 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2021-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80178075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Surface Modification of Steel Foils by Depositing Cr/Al or Al/Cr Thin Films: Effect of Rapid Heat Treatment","authors":"H. Khachatryan, Kyoung-Bo Kim, Moojin Kim","doi":"10.5757/asct.2021.30.5.146","DOIUrl":"https://doi.org/10.5757/asct.2021.30.5.146","url":null,"abstract":"In this study, Al and Cr films were deposited onto steel substrates, and the film growth and microstructure were tracked. In the first set of experiments, Al was directly deposited onto steel, and Cr films were then deposited on top of the formed Al films. In the second set of experiments, it was vice versa ; that is, Cr films were deposited onto the steel substrate, followed by Al film deposition. This technique was aimed at controlling the reflection property of the steel substrate to enable using steel foils for flexible display fabrication. It was observed that temperature significantly influenced grain formation and growth processes. When the temperature reached 550 ∘ C, segregation occurred in the system where Cr contacted the steel, and Al was on the top layer. However, a similar phenomenon was not observed in the steel/Al/Cr system. The reflection value significantly decreased from 92 to 5–7 %, owing to these segregations.","PeriodicalId":8223,"journal":{"name":"Applied Science and Convergence Technology","volume":"4 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2021-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86073900","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of Reaction Time on Optical Properties of CsPbBr3 Perovskite Nanocrystals","authors":"Sung Hun Kim, Yong-Ryun Jo, Yong Bin Kim, Ju Seok Kim, S. Yim, Hong Seok Lee","doi":"10.5757/asct.2021.30.5.152","DOIUrl":"https://doi.org/10.5757/asct.2021.30.5.152","url":null,"abstract":"","PeriodicalId":8223,"journal":{"name":"Applied Science and Convergence Technology","volume":"58 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2021-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74381859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparison of Ionic Liquid and Ion-Gel Top-Gate MoS2 Field-Effect Transistors","authors":"Guen Hyung Oh, Taewan Kim","doi":"10.5757/asct.2021.30.5.156","DOIUrl":"https://doi.org/10.5757/asct.2021.30.5.156","url":null,"abstract":"Polymer electrolytes and ionic liquids (ILs) have attracted significant interest in applications as gate dielectrics. In this study, we fabricated top-gated molybdenum disulfide (MoS2) thin-film transistors using IL and ion-gel (IG) gate dielectrics. Room-temperature Raman spectra measurements indicated a dominant peak spectral emission at 358 cm−1 (E1 2g) and 406.44 cm−1 (A1g) associated with bilayer MoS2 films. The fabricated thin-film field-effect transistors (FET) with IG gate dielectric exhibited band transport with a highest mobility of 0.5 cm2/V⋅s, and a poor ION/IOFF ratio of ~10. By contrast, the FET with IL gate dielectric exhibited a 3400 % improvement in terms of the mobility (17.9 cm2/V⋅s), and a 1000 % improvement of the ION/IOFF ratio (~100).","PeriodicalId":8223,"journal":{"name":"Applied Science and Convergence Technology","volume":"28 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2021-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81204703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Study on Direct Current Arc Plasma Torch Design with Preserve Nozzle for Perfluorinated Compounds (PFCs) Decomposition in Cement Kiln","authors":"Tae-Wook Kim, Gye-Young Jo, Soo-Min Lee, Kyu-Hang Lee, Yetang Jin, Byung-Koo Son","doi":"10.5757/asct.2021.30.5.137","DOIUrl":"https://doi.org/10.5757/asct.2021.30.5.137","url":null,"abstract":"Perfluorinated compounds (PFCs), including sulfur hexafluoride (SF 6 ), are used as insulating gases for heavy electric equipment, and are green- house gases with a very high global warming potential. For the thermal decomposition of greenhouse gases, a high temperature of 3,000 K or more and a technology to prevent recombination of the decomposed gases are required. A direct current plasma arc with a flame temperature of 6,000 K or higher provides an effective ultra-high temperature for the decomposition of chemically stable PFCs. A large amount of CaO, which is a raw material for clinker, is in the cement kiln, hence the S and F radicals decomposed from SF 6 react with CaO to quickly convert it to CaF 2 and CaSO 4 and prevent their recombination. Therefore, the convergence technology of plasma and cement kiln is known as an effective method for treating PFCs. However, the interior of the cement kiln causes erosion of the plasma torch due to the turbulent flow of a large amount of combustion air at a high temperature of 1,500 ∘ C or more, and the scattering of the raw material particles of the clinker, which greatly affects the operation stability. In this study, a plasma torch was developed that can maintain stable plasma in a vulnerable environment and effectively decompose PFCs. Moreover, the design and results of the experiment on the torch were presented to enable stable plasma operation for a long time in vulnerable environmental conditions through durability, plasma efficiency, and analysis of the discharge characteristics. thermal efficiency, and durability of the plasma torch were analyzed. Continuous operation of the plasma torch for more than 1,000 h while maintaining the plasma characteristics even in en- vironments with a high temperature, vibration, and strong turbulent flow was verified using a molybdenum preserve nozzle. At this time, the plasma efficiency was measured as 79.1%, confirming the supe-rior durability and efficiency of the developed plasma torch to those of the conventional PFC treatment torch. These results show that the high-temperature plasma torch can be considered advanced technol- ogy with high utility in various waste gas treatment processes and plasma incineration fields by overcoming the short lifespan due to electrode erosion, which is a known disadvantage of high-temperature plasma torches.","PeriodicalId":8223,"journal":{"name":"Applied Science and Convergence Technology","volume":"22 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2021-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77686751","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}