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Electrochemical behavior of phosphorous doped single-walled carbon nanohorns for supercapacitor
위재형,전우식,유혜진,김융암,양철민 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
본 연구에서는, 산화성 분위기에서 Single-Walled Carbon Nanohorns(SWCNHs) 표면에 나노스케일의 hole(nanohole)을 형성시킨 후, phosphorous (P)를 도핑하고 그에 따른 전기화학적 거동을 조사하였다. P 도핑 후, SWCNHs의 구조적 변화는 질소흡착, X-ray photoelectron spectroscopy (XPS), Raman spectroscopy를 이용하여 분석하였다. XPS 분석을 통해 SWCNHs구조에 P의 도핑을 확인할 수 있었고, SWCNHs의 graphitic 구조에 있어서의 변화는 Raman분석을 통해 확인할 수 있었다. 산화성 분위기에서의 처리후 SWCNHs 표면에 형성된 nanohole에 기인하여 SWCNH의 비표면적이 크게 증가하지만, P 도핑 후 SWCNHs의 비표면적의 감소가 관찰되었다. 본 발표에서는, 이렇게 제조된 P도핑 SWCNHs를 적용한 supercapacitor 전극의 전기화학적 거동 및 성능에 있어서의 P도핑의 효과에 대해서 보고하고자 한다.
Fibrous and granular activated carbon mixed media for effective gas removal as a cabin air filter
위재형,Bae Younghwan,Ahn Hyunchul,Choi Yeong Og,정의경,Yeo Sang Young 한국탄소학회 2022 Carbon Letters Vol.32 No.4
There is a need for the purification of indoor air owing to a high rate of pollution in today’s world. For this, cabin air filters (CAFs) are widely used, which requires the addition of certain adsorbents to increase the volatile organic compound (VOC) removal efficiency. However, this addition causes high-pressure resistance, which may hamper commercial applications by requiring more energy and negatively affecting fresh air delivery rate. Hence, in this study, a high-performance combined CAF (CCAF) with excellent dust and chemical filtration performance and low differential pressure was prepared using granular activated carbon (GAC)/activated carbon fiber (ACF) mixed medium. The GAC/ACF mixed medium had higher air permeability than the ACF medium of the same weight, and it exhibited similar ultrafine dust filtration performance to the ACF medium without an increase in differential pressure. In addition, the GAC/ACF mixed medium showed excellent gas removal performance without increasing differential pressure by combining the VOC removal characteristics of the GAC and ACF filter media. The improved VOC removal performance of the GAC/ACF mixed medium was due to the hybrid effect of the hierarchical pore structures of the GAC and the nearly uniform pore structures of the ACF, which resulted in a slow and increased gas adsorption by the GAC and rapid gas adsorption of the ACF.
유도결합플라즈마를 이용한 O<sub>2</sub>/BCl<sub>3</sub>/Ar가스에 따른 Indium Tin Oxide 박막의 식각 특성 연구
위재형,우종창,김창일,Wi, Jae-Hyung,Woo, Jong-Chang,Kim, Chang-Il 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.10
The etching characteristics of indium tin oxide (ITO) thin films in an $O_2/BCl_3/Ar$ plasma were investigated. The etch rate of ITO thin films increased with increasing $O_2$ content from 0 to 2 sccm in $BCl_3$/Ar plasma, whereas that of ITO decreased with increasing $O_2$ content from 2 sccm to 6 sccm in $BCl_3$/Ar plasma. The maximum etch rate of 65.9 nm/m in for the ITO thin films was obtained at 2 sccm $O_2$ addition. The etch conditions were the RF power of 500 W, the bias power of 200 W, the process pressure of 15 mTorr, and the substrate temperature of $40^{\circ}C$. The analysis of x-ray photo electron spectroscopy (XPS) was carried out to investigate the chemical reactions between the surfaces of ITO thin films and etch species.
유도결합플라즈마를 이용한 O2/BCl3/Ar가스에 따른 Indium Tin Oxide 박막의 식각 특성 연구
위재형,우종창,김창일 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.10
The etching characteristics of indium tin oxide (ITO) thin films in an O2/BCl3/Ar plasma were investigated. The etch rate of ITO thin films increased with increasing O2 content from 0 to 2 sccm in BCl3/Ar plasma, whereas that of ITO decreased with increasing O2 content from 2 sccm to 6 sccm in BCl3/Ar plasma. The maximum etch rate of 65.9 nm/m in for the ITO thin films was obtained at 2 sccm O2 addition. The etch conditions were the RF power of 500 W, the bias power of 200 W, the process pressure of 15 mTorr, and the substrate temperature of 40℃. The analysis of x-ray photo electron spectroscopy (XPS) was carried out to investigate the chemical reactions between the surfaces of ITO thin films and etch species.
조남필,위재형,배영환,이원준,여상영,Cho, Nam Pil,Wee, Jae-Hyung,Bae, Young Hwan,Lee, Won Jun,Yeo, Sang Young 한국섬유공학회 2022 한국섬유공학회지 Vol.59 No.5
Flash-spun nonwoven has high barrier properties, so the pressure difference is higher than other nonwoven. This characteristic can be controlled by adjusting the volume of the pressure drop nozzle during the flash spinning process. To control the characteristics, flash spinning was performed by designing the volume of the pressure drop nozzle. The shape and diameter distribution characteristics of the flash-spun fibers were analyzed. To evaluate the possibility of a filtering material, the fibers were chopped to prepare a wet-laid nonwoven. Air permeability and filtration efficiency were evaluated for the prepared wet-laid nonwovens. The properties of the wet-laid nonwoven were correlated with the dispersion value of the flash spun fibers. Wet-laid nonwoven manufactured based on flash-spun fibers is expected to be applied as a filter medium because the differential pressure can be lowered through process control.
이윤선,이승용,위재형,심상은,양철민 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
탄소나노튜브(carbon nanotubes)는 6각형 고리형태의 탄소들이 막대모양으로 길게 말려있는 튜브형태의 물질이다. 탄소나노튜브가 특별한 지지체 없이 서로 엉켜 있는 종이형태의 물질을 버키페이퍼(buckypaper)라고 부른다. 버키페이퍼는 종이와 같이 얇고 기계적 유연성이 뛰어나며 가벼운 특성을 갖고 있다. 또한 탄소나 노튜브로만 이루어져 있으므로 높은 열전도도와 전기전도도를 갖고 있다. 이러한 특성으로 인하여 버키페이퍼는 방열시트, 나노 복합체 및 에너지 저장 등 여러 방면에 이용 될 것으로 예상된다. 본 연구에서는 FWCNTs(Few-walled carbon nanotubes)를 용매에 분산시켜 감압여과 과정을 거쳐 버키페이퍼를 제작하고, 제작된 버키페이퍼의 밀도 및 구조변화에 따른 열전도도의 변화를 관찰했다. FE-SEM (field-emission scanning electron microscope), Raman spectroscopy 등을 통하여 구조를 분석했고, LFA(laser flash analysis)를 사용하여 열전도도를 관찰했다.