• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2003년도 하계학술대회 논문집 Vol.4 No.2
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• pp.1184-1187
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• 2003

Electrochemical capacitors are becoming attractive energy storage systems particularly for applications involving high power requirements such as hybrid systems consisting of batteries and electrochemical capacitors for electric vehicle propulsion. A new type electric double layer capacitor (EDLC) was constructed by using carbon nanofibers (CNFs) and DAAQ(1,5-diaminoanthraquinone) electrode. Carbonaceous materials are found in variety forms such as graphite, diamond, carbon fibers etc. While all the carbon nanofibers include impurities such as amorphous carbon, nanoparticles, catalytic metals and incompletely grown carbons. We have eliminated of Ni particles and some carbonaceous particles in nitric acid. Nitric acid treated CNFs could be covered with very thin DAAQ oligomer from the results of CV and TG analyses and SEM images. DAAQ oligomer film exhibited a specific capacity as 45-50 Ah/kg in 4M $H_2SO_4$. We established Process Parameters of the technique for the formation of nano-structured materials. Furthermore, improved the capacitive properties of the nano structured CNFs electrodes using controlled solution chemistry. As a result, CNFs coated by DAAQ composite electrode showed relatively good electrochemical behaviors in acidic electrolyte system with respect to specific capacity and scan rate dependency.

• Membrane and Water Treatment
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• 제8권6호
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• pp.553-562
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• 2017

In the present study, the water desalination across the penta-graphene has been explored by using molecular dynamics simulation. The penta-graphene, a new carbon allotrope, introduced theoretically in 2015. It was shown that this carbon nanostructure is slightly stiffer against buckling in comparison with the graphene nanoribbons. The effect of radius of curvature (ROC) of the membrane, pore size, and applied pressure, on water flow rate, and salt rejection is investigated. It is shown that salt rejection, and the shape of the oxygen density distribution inside the pore can be influenced by the ROC of membrane. Finally, it is shown that the ROC, and pore size of 2D membranes, play an important role in the salt rejection.

• 한국진공학회지
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• 제22권6호
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• pp.277-284
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• 2013

아세틸렌과 수소기체를 원료기체로 하고 육불화황을 첨가기체로 하여 열화학 기상 증착하에서 탄소코일을 합성하였다. 이 때 산화실리콘 기판위의 니켈막을 탄소코일 성장의 촉매로 사용하였다. 성장된 탄소코일의 생성밀도, 형상, 기하구조 등을 수소 플라즈마 전처리의 유무에 따라 조사하였다. 상대적으로 짧은 시간(1분)의 수소 플라즈마 전처리는 탄소 마이크로 코일을 우세하게 성장시켰다. 긴 시간(30분)동안의 수소플라즈마 전처리는 탄소마이크로 성장 축을 따라 수많은 탄소 나노코일이 들어붙어 있는 특이한 구조를 보였다. 이 특이한 구조는 매우 작은 니켈 촉매의 알갱이를 효과적으로 지지할 수 있는 촉매 지지대로서의 역할을 할 수 있을 것으로 예견되었다.

• 전기학회논문지
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• 제56권1호
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• pp.132-138
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• 2007

Carbon nanotubes (CNTs) arc grown on Ni catalysts employing an inductively-coupled plasma chemical vapor deposition (ICP-CVD) method. The structural and field-emissive properties of the CNTs grown are characterized in terms of the substrate-bias applied. Characterization using the various techniques, such as field-omission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), Auger spectroscopy (AES), and Raman spectroscopy, shows that the structural properties of the CNTs, including their physical dimensions and crystal qualities, as well as the nature of vertical growth, are strongly dependent upon the application of substrate bias during CNT growth. It is for the first time observed that the provailing growth mechanism of CNTs, which is either due to tip-driven growth or based-on-catalyst growth, may be influenced by substrate biasing. It is also seen that negatively substrate-biasing would promote the vertical-alignment of the CNTs grown, compared to positively substrate-biasing. However, the CNTs grown under the positively-biased condition display a higher electron-emission capability than those grown under the negatively-biased condition or without any bias applied.

• Transactions on Electrical and Electronic Materials
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• 제8권5호
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• pp.206-210
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• 2007

Carbon nanotubes(CNTs) are largely synthesized on Fe catalysts by catalytic chemical vapor deposition. The various shapes and compositions of these nanostructure CNTs were obtained by controlled parameters such as the reaction temperature, gas-mixing ratio. The influence of these parameters is investigated, together with observations of the produced materials after the purification processes. A diameter of CNTs, range from 2 to 10 nm, closely correlated with the size of the catalyst particle found attached to the tube end. The yield of CNTs was estimated to be 88.5 % and the purities of CNTs thus obtained were more than 80 %. The experimental results were documented with field emission scanning electron microscopy and raman spectroscopy and transmission electron microscopy, both before and after the purification.

• 한국결정성장학회지
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• 제24권5호
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• pp.207-212
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• 2014

2차원 흑연구조를 갖는 카본나노시트는 큰 비표면적과 우수한 전기적, 화학적 및 기계적 물성으로 인하여 미래소재로 각광받고 있다. 경제적이고 쉬운 카본나노시트의 양산공정개발을 위해 본 연구에서는 메테인($CH_4$)과 프로페인($C_3H_8$) 가스를 이용한 유도 열플라즈마 공정을 통해 기상 합성하여 카본나노시트 분말을 합성하였다. 유도 열플라즈마를 이용한 카본나노시트 합성은 촉매나 증착공정 없이 진행되었으며, 합성된 카본나노시트의 물성을 TEM, Raman, XRD, BET로 분석하였다. 메테인과 프로페인으로부터 합성된 카본 나노시트는 각각 5~6개의 그래핀 층과 15~16개의 그래핀 층으로 이루어진 분말로 합성되었으며 분말의 크기는 약 100 nm임을 확인할 수 있었다.

• 한국항공우주학회지
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• 제40권11호
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• pp.1004-1009
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• 2012

탄소나노튜브는 우수한 전기적 특성과 전계를 집중시킬 수 있는 높은 종횡비 그리고 뛰어난 열적 안정성 때문에, 높은 전류밀도와 낮은 구동전압 그리고 긴 수명시간과 같은 우수한 전계 방출 특성을 구현할 수 있는 재료이다. 탄소나노튜브를 이용하여 전계방출원을 제작하기 위해서는 금속전극에 탄소나노튜브를 고정시켜야 한다. 이때 금속과 탄소나노튜브 사이의 접촉문제가 필수적인데, 본 실험에서는 그래핀을 계면으로 사용함으로써 본 문제를 해결하였다. 이러한 시도는 금속과 탄소나노튜브 사이에 우수한 전기적 열적 계면을 형성함으로써 기존 전계방출원보다 뛰어난 전계방출 성능을 얻을 수 있게 하였다. 본 연구를 통해 탄소나노튜브 전계방출원을 전자 추진원으로의 응용이 기대된다.

• 한국재료학회지
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• 제22권8호
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• pp.416-420
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• 2012

Recently nanoscience and nanotechnology have been studied intensively, and many plants, insects, and animals in nature have been found to have nanostructures in their bodies. Among them, lotus leaves have a unique nanostructure and microstructure in combination and show superhydrophobicity and a self-cleaning function to wipe and clean impurities on their surfaces. Coating films with combined nanostructures and microstructures resembling those of lotus leaves may also have superhydrophobicity and self-cleaning functions; as a result, they could be used in various applications, such as in outfits, tents, building walls, or exterior surfaces of transportation vehicles like cars, ships, or airplanes. In this study, coating films were prepared by dip coating method using polypropylene polymers dissolved in a mixture of solvent, xylene and non-solvent, methylethylketon, and ethanol. Additionally, attempts were made to prepare nanostructures on top of microstructures by coating with the same coating solution with an addition of carbon nanotubes, or by applying a carbon nanotube over-coat on polymer coating films. Coating films prepared without carbon nanotubes were found to have superhydrophobicity, with a water contact angle of $152^{\circ}$ and sliding angle less than $2^{\circ}$. Coating films prepared with carbon nanotubes were also found to have a similar degree of superhydrophobicity, with a water contact angle of 150 degrees and a sliding angle of 3 degrees.

• 한국분말재료학회지
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• 제9권3호
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• pp.167-173
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• 2002

A new approach to produce nanostructured WC/Co composite powders by a mechanochemical process was made to improve the mechanical properties of advanced hardmetals. Homogeneous spherical W-Co salt powders were made by spray drying of aqueous solution from ammonium metatungstate($(NH_4)_6(H_2W_{12}O_{40})\cdo4H_2O$,AMT) and cobalt nitrate hexahydrate (Co(NO$_3$)$_2$.6$H_2O$). spray dried W-Co salt powders were calcined for 1 hr at $700^{\circ}C$ in atmosphere of air. The oxide powder was mixed with carbon black by ball milling and this mixture was heated with various temperatures and times in $H_2$. The $WO_3/CoWO_4$ composite oxide powders were obtained by calcinations at $700^{\circ}C$. The primary particle size of W/Co composite oxide powders by SEM was 100 nm. The reduction/carburization time decreased with increasing temperatures and carbon additions. The average size of WC particle carburized at $800^{\circ}C$ by TEM was smaller than 50 nm.

• 대한기계학회논문집B
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• 제35권9호
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• pp.969-974
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• 2011

탄소나노튜브(CNT)는 원통형의 탄소나노 구조물로서, 뛰어난 전도특성과 열전도율을 갖는다. 이러한 특성을 이용한 다양한 응용 분야의 하나로 CNT 를 박막형태의 그물망으로 제작하여 전도성 필름으로 응용하는 방안이 연구되고 있다. 이러한 CNT 의 박막 제조 방법 중, 분무 코팅 방식은 대면적 박막 제조에 널리 사용되나, 박막 두께를 균일하게 제작하는 점에 어려움이 있다. 이러한 문제점을 해결하려면 분무시의 공정조건이 증착 두께 분포에 미치는 효과를 잘 분석해야 한다. 본 연구에서는 분무 공정에서의 증착두께분포를 예측하기 위한 수치해석 모델을 개발하였다. 또한, 개발된 모델을 이용하여 여러가지 노즐 경로에 따른 증착 두께 분포를 분석하였다.