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Gayoung Lim,Goseong Bok,Young-Seok Kim,Youngmin Kim 대한금속·재료학회 2022 ELECTRONIC MATERIALS LETTERS Vol.18 No.2
Thermally conductive (TC) adhesive tapes consisting of adhesives and TC fillers are widely used as thermal interface materials because of their tack properties for temporary fixation and high peel strength for permanent bond. However, the trade-off between peel strength and thermal conductivity with increasing filler loading impedes the manufacture of high-performance TC tapes. Therefore, a technique to realize high thermal conductivity of TC adhesives with lower filler loading is crucial. In this study, epoxy-based adhesives (EAs) was used to fabricate TC adhesive tapes. To secure high peel strength of EAs, a cyclic carbonate-terminated oligomer (CCO) was synthesized and employed as a component. The simultaneous reactions between epoxy resin, CCO and curing agent were analyzed using FTIR spectroscopy. Thanks to tack, the partially cured EAs could be used to fabricate tapes which were temporarily fixed and then permanently bonded via complete curing. Next, EAs and h-BN fillers were admixed to produce TC adhesive tapes. Because h-BN fillers were partially aligned to the in-plane direction by bar-coating, the in-plane thermal conductivity of the TC-1 adhesive containing only 20 wt% h-BN fillers was as high as 2.73 W/m K, which was slightly lower than that (2.97 W/m·K) of the TC-4 adhesive containing 35 wt% h-BN fillers. In addition, the peel strength of the TC-1 adhesive tape reached 2307 (± 64) gf/in.
청소년의 협력과 사고력 증진을 위한 디자인 교육 프로그램 연구
임가영(Lim, Gayoung),현은령(Hyun, Eunryung) 한국디지털디자인협의회 2014 (사)한국디지털디자인협의회 conference Vol.2014 No.5
Design education is related to the social and cultural. Therefore, a close relationship with contemporary situations. Prior to the design of youth education and cultural understanding, the current required by the society, it is important to know the purpose of education. Young people living in the 21st century era of pluralism was born. And young people the information, industrialized societies live in the environment. In order to understand these youth need an integrated perspective and Access to popular culture. However, the negative impact of popular culture, but in the meantime young people was highlighted. The purpose of this paper is to understand the modern youth culture to promote cooperation and design thinking to develop a training program focus on korean wave cultural contents. Design education through self-directed learning is an active and look forward to it.
Colored a-Si:H transparent solar cells employing ultrathin transparent multi-layered electrodes
Lim, Jung Wook,Kim, Gayoung,Shin, Myunghun,Yun, Sun Jin Elsevier 2017 Solar energy materials and solar cells Vol.163 No.-
<P><B>Abstract</B></P> <P>We fabricated hydrogenated amorphous silicon (a-Si: H) transparent solar cells using ultrathin transparent multi-layered electrodes (TMEs) as rear-side transparent electrodes for building-integrated photovoltaic (BIPV) windows. Each TME included a bottom layer, thin Ag layer, and optoelectronic controlling layer (OCL). The TMEs were experimentally designed to have high transparency and conductance. The fabricated a-Si:H transparent solar cells showed optimal performance with a 6.36% power-conversion efficiency and 23.5% average transmittance (500–800nm) when TMEs with a thickness less than 160nm were incorporated. We demonstrated that the reflection color of the cell could be tuned without serious loss of cell efficiency by varying the thickness of the OCL. The backside colors were predicted to be the coordinates on a CIE 1931 chromaticity diagram using the reflection spectrum from the cell and emission spectrum of a 50W LED light source. The developed a-Si:H transparent solar cells exhibited high efficiency and show feasibility for incorporating various colors in the photovoltaic and aesthetic functionalities of BIPV windows.</P>
Bifacial color realization for a-Si:H solar cells using transparent multilayered electrodes
Kim, Gayoung,Lim, Jung Wook,Shin, Myunghun,Yun, Sun Jin Elsevier 2018 SOLAR ENERGY -PHOENIX ARIZONA THEN NEW YORK- Vol.159 No.-
<P><B>Abstract</B></P> <P>Transparent hydrogenated amorphous silicon (a-Si:H) thin-film solar cells, in which the colors of the front and rear faces can be adjusted individually, were developed for implementation in building-integrated photovoltaic (BIPV) windows. The proposed ultrathin transparent multilayered electrodes (TMEs) are highly conductive and transparent, consisting of a bottom layer of gallium-doped zinc oxide (GZO), a thin metal layer of Ag, and an optoelectronic controlling layer (OCL) of GZO. They can be used for both the front and rear electrodes of transparent a-Si:H solar cells, and the resulting solar cells show a 5.0% average power conversion efficiency and 18.3% average transmittance. The various dual colors on the front and rear of the cell can be individually adjusted by changing the thickness of the OCL on each face of the TME, without significantly changing the efficiency. The cell colors were quantitatively investigated using the color coordinates in a chromaticity diagram based on the International Commission on Illumination (CIE; 1931) standard to show that the simulated and observed colors match well under both LED and fluorescent light sources. We also show that the observable color of the BIPV windows is determined by indoor and outdoor light sources, and dynamically varies as a function of illuminance of the light source as the day gradually progresses into night. This study helps to elucidate the color behavior of the BIPV windows and to develop a-Si:H BIPV windows that show various colors with stable electrical power generation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Development of transparent hydrogenated amorphous silicon (a-Si:H) solar cells. </LI> <LI> The colors independently controlled without seriously affecting the efficiency. </LI> <LI> The colors of solar windows considering indoor light illumination conditions. </LI> <LI> Quantitative analysis of colored solar cells using CIE 1931 diagram. </LI> </UL> </P>
Eom, Gayoung,Kim, Hongki,Hwang, Ahreum,Son, Hye-Young,Choi, Yuna,Moon, Jeong,Kim, Donghyeong,Lee, Miyeon,Lim, Eun-Kyung,Jeong, Jinyoung,Huh, Yong-Min,Seo, Min-Kyo,Kang, Taejoon,Kim, Bongsoo Wiley (John WileySons) 2017 Advanced functional materials Vol.27 No.37
<P>Telomerase has attracted much attention as a universal cancer biomarker because telomerase is overexpressed in more than 85% of human cancer cells while suppressed in normal somatic cells. Since a strong association exists between telomerase activity and human cancers, the development of effective telomerase activity assay is critically important. Here, a nanogap-rich Au nanowire (NW) surface-enhanced Raman scattering (SERS) sensor is reported for detection of telomerase activity in various cancer cells and tissues. The nanogap-rich Au NWs are constructed by deposition of nano-particles on single-crystalline Au NWs and provided highly reproducible SERS spectra. The telomeric substrate (TS) primer-attached nanogap-rich Au NWs can detect telomerase activity through SERS measurement after the elongation of TS primers, folding into G-quadruplex structures, and intercalation of methylene blue. This sensor enables us to detect telomerase activity from various cancer cell lines with a detection limit of 0.2 cancer cells mL(-1). Importantly, the nanogap-rich Au NW sensor can diagnose gastric and breast cancer tissues accurately. The nanogap-rich Au NW sensors show strong SERS signals only in the presence of tumor tissues excised from 16 tumor-bearing mice, while negligible signals in the presence of heated tumor tissues or normal tissues. It is anticipated that nanogap-rich Au NW SERS sensors can be used for a universal cancer diagnosis and further biomedical applications including a diverse biomarker sensing.</P>