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나종주(Jong-Joo Rha),엄대용(Dae-Yong Um),이건환(Gun-Hwan Lee),최두선(Doo-Sun Choi),김완두(Wan-Doo Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
Super-hydrophobic treated Polyimide film was used as a flexible substrate for developing a new method of metallization. Hydrophilic patterns were fabricated by UV irradiation through shadow mask. Patterned super-hydrophobic substrate was dipped into a bath containing silver nano ink. Silver ink was only coated on hydrophilic patterned area. Metal lines of 600㎛ pitch were fabricated successfully. However, their thickness was too thin to serve as interconnection. To overcome this problem, iterative dipping was conducted. After repeating five times, the thickness of silver metal lines were increased to over than 2㎛. After heat treatment of silver lines, their resistivities were reduced to order of 30 μΩ-㎝ the similar level of values reported in other literatures. So, a new method of metallization has high potential for application of RFID antenna and flexible electronics substrates.
나종주(Jong-Joo Rha),엄대용(Dae-Yong Um),이건환(Gun-Hwan Lee),최두선(Doo-Sun Choi),김완두(Wan-Doo Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Super-hydrophobic treated Polyimide film showed more than 20 times increase of surface roughness and over 150° of water contact angle. Super-hydrophobic surface was patterned to hydrophilic according to mask pattern by UV(Ultra Violet) irradiation. Patterned surface was immersed into deionized water container and then pulled out. Water only covered on hydrophilic pattern. This patterning technology might be used for metallization of flexible Polyimide substrate.
진공 플라즈마 처리를 통한 초소수성 표면 제작 및 특성 평가
나종주(Jong Joo Rha),정용수(Yong Soo Jeong),김완두(Wan Doo Kim) 대한기계학회 2008 大韓機械學會論文集A Vol.32 No.2
Super-hydrophobic surfaces showed that contact angle of water was higher than 140 degrees. That surface could be made several methods such as Carbon nano tubes grown vertically, PDMS asperities arrays, hydrophobic fractal surfaces, and self assembled monolayers coated by CVD and so on. However, we fabricated super-hydrophobic surfaces with plasma treatments which were very cost efficient processes. Their surfaces were characterized by static contact angles, advancing, receding, and stability against UV irradiation. Optimal surfaces showed static contact angles were higher than 150 degrees. Super-hydrophobic property was remained after UV irradiation for one week.
O<sub>2</sub> 플라즈마로 전처리된 PET 및 PI 필름의 2단계 CHF<sub>3</sub> 플라즈마 처리가 필름의 표면특성에 미치는 영향
강인숙,나종주,Kang, In-Sook,Rha, Jong-Joo 한국섬유공학회 2012 한국섬유공학회지 Vol.49 No.5
Poly(ethylene terephthalate) and poly(imide) surfaces pre-treated by $O_2$ plasma were modified by two-step $CHF_3$ plasma, and the plasma modified film surface were investigated with scanning probe microscopy, X-ray photoelectron spectroscopy, and contact-angle and surface energy to characterize the surfaces. The surface energies were calculated from measured contact angles between several solutions and film-based on geometric means and the Lewis acid-base method. The exposure of the PET and PI film surfaces pre-treated by $O_2$ plasma to the two-step $CHF_3$ plasma led to the decrease in surface roughness and increase of the contact angles of film in water and surfactant solution. Primarily because of the contribution of polar force, the surface energy and hydrophilicity of PET and PI film treated by $CHF_3$ plasma decreased greatly. Electron spectroscopy for chemical analysis (ESCA) indicated that the $CHF_3$ plasma treatment introduced fluorine functional groups led to a decrease of the surface energy and hydrophilicity of PET and PI film.
손수정,조영상,나종주,최철진,Son, Soo-Jung,Cho, Young-Sang,Rha, Jong Joo,Cho, Chul-Jin 한국분말야금학회 2013 한국분말재료학회지 (KPMI) Vol.20 No.2
This study is carried out to develop the new process for the fabrication of ultra-fine electrodes on the flexible substrates using superhydrophobic effect. A facile method was developed to form the ultra-fine trenches on the flexible substrates treated by plasma etching and to print the fine metal electrodes using conductive nano-ink. Various plasma etching conditions were investigated for the hydrophobic surface treatment of flexible polyimide (PI) films. The micro-trench on the hydrophobic PI film fabricated under optimized conditions was obtained by mechanical scratching, which gave the hydrophilic property only to the trench area. Finally, the patterning by selective deposition of ink materials was performed using the conductive silver nano-ink. The interface between the conductive nanoparticles and the flexible substrates were characterized by scanning electron microscope. The increase of the sintering temperature and metal concentration of ink caused the reduction of electrical resistance. The sintering temperature lower than $200^{\circ}C$ resulted in good interfacial bonding between Ag electrode and PI film substrate.
RF sputter를 이용한 실리카 증착 고 내구성 반사 방지막 제조
전성권,정은욱,나종주,권정대,Jeon, Seong-Gwon,Jeong, Eun-Uk,Rha, Jong-Joo,Kwon, Jung-Dae 한국표면공학회 2019 한국표면공학회지 Vol.52 No.2
We fabricated durable anti-reflective(AR) layer with silica globular coating on polymer by two steps. Firstly, nano-protrusions of polymer were formed by plasma etching known as R.I.E(reactive ion etching) process. Secondly, silica globular coating was deposited on polymer nano-protrusions for mechanically protective and optically enhancing AR layers by RF magnetron sputter. And then durable antireflective polymers were synthesized adjusting plasma power and time, working pressures of RIE and RF sputtering processes. Consequently, we acquired the average transmission (94.10%) in the visible spectral range 400-800 nm and the durability of AR layer was verified to sustain its transmission until 5,000 numbers by rubber test at a load of 500 gf.
장영준(Young-Jun Jang),나종주(Jong-Joo Rha),김석삼(Seock-Sam Kim) 한국트라이볼로지학회 2004 한국트라이볼로지학회 학술대회 Vol.38 No.-
The present work dealt with tribological properties of RCA cleaned Si surfaces in order to eliminate various kinds of contaminants. For this goal, Atomic Force Microscope(AFM) was used to observe nanowear process and evaluate nanowear behavior of Si surface. Nanoscratch tests were carried out using a very sharp diamond tip. Spring constant was 1.6N/m. Normal force used in the scratch tests ranged from 0 to 358nN. It was found that specimens exhibited two types of nanowear processes during scratching. The first one was surface depression due to plastic deformation and abrasive wear(cutting & ploughing). The second process was controlled by surface upheaval on scratched surface as a pre-stage wear by scratching and molecules from the absorbed air, such as oxygen and/or water and other chemical compounds. It was corresponding to experimental results of microwear process by Kaneko.
UV 나노임프린트 리소그래피를 위한 불화 함유 다이아몬드 상 탄소 스탬프의 제작
알툰 알리(Altun Ali Ozhan),정준호(Jun-ho Jeong),나종주(Jong-joo Rha),최대근(Dae-geun Choi),김기돈(Ki-don Kim),이응숙(Eung-sug Lee) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
A fluorine-doped diamond-like carbon (F-DLC) stamp which has high contact angle, high UV-transmittance and sufficient hardness, was fabricated using the following direct etching method: F-DLC is deposited on a quartz substrate using DC and RF magnetron sputtering, PMMA is spin coated and patterned using e-beam lithography and finally, O2 plasma etching is performed to transfer the line patterns having 100 ㎚ line width, 100 ㎚ line space and 70 ㎚ line depth on F-DLC. The optimum fluorine concentration was determined after performing several pre-experiments. The stamp was applied successfully to UV-NIL without being coated with an anti-adhesion layer.