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Surface Assembly Strategy for the Fabrication of MoS2 Thin-film Patterns
박규열,김현수,이병양 한국정밀공학회 2019 International Journal of Precision Engineering and Vol.20 No.12
Molybdenum disulfide (MoS2) is a novel material with remarkable properties that is widely investigated for future applications in electronics, sensors, and smart materials. In this respect, a low cost, easy process, large-area mass production process is needed to obtain diverse structures and surface patterns of MoS2. Here, we demonstrate an effective MoS2 patterning process using substrate surface modification that can solve the difficulties encountered in previous studies. This technique utilizes the sulfur vacancies introduced during chemical exfoliation of MoS2 flakes. The MoS2 patterning is performed via surface modification with thiol molecules on the substrate in pre-designed shapes. The thiol (–SH) group required to bond MoS2 to the surface-modified substrate using (3-mercaptopropyl)trimethoxysilane was confirmed by FT-IR and the patterned MoS2 was confirmed by Raman shift. Through this process, a gas sensor was fabricated and its feasibility was confirmed to show its applicability to various applications MoS2.
박규열,이대길,중천위웅 대한기계학회 1994 대한기계학회논문집 Vol.18 No.10
The mirror surface grinding of carbon fiber reinforced plastics(CFRP) was realized by using the metal bonded super-abrasive micro grain wheel with electrolytic in-process dressing(ELID). The maximum surface roughness $R_{max}$ of CFRP which was obtained with #6,000 wheel, was 0.65 $\mu{m}$, which was rougher surface finish compared to those of hard and brittle materials with the same mesh number wheel with ELID. The grinding performance was much dependent on the grinding direction and the best surface roughness was obtained at $90^{\circ}C$ grinding with fiber direction. The spark-out effect on the surface improvement was significant when smaller mesh number grinding wheels were used. From the surface observations of CFRP with scanning electron microscope(SEM) and Auger electron spectroscopy(AES), it was found that the mirror surface grinding of CFRP was generated by the homogenization due to carbonization of the ground surface and smearing of chips composed of the carbon fiber and carbonized epoxy resin into the ground surface.
박규열,최진호,이대길 대한기계학회 1994 대한기계학회논문집 Vol.18 No.12
The high strength and wear-resistant metal bonded diamond wheel was applied to the drilling process of carbon fiber reinforced plastics (CFRP), The helical-feed drilling method was use for the first time to overcome the limit of drilling depth of the conventional drilling process and to improve the dressing of the wheel. The helical-feed drilling method was found effective at high cutting speed without the limit of drilling depth.
절단용 공구의 미세형상 에지성형을 위한 경사축 연삭법의 개발
권성,박규열 울산대학교 1998 공학연구논문집 Vol.29 No.2
본 논문은 절단용 공구의 에지형상의 성형연삭을 위한 새로운 연삭방법의 개발에 관한 것이다. 구체적으로는 볼록한 형상을 갖는 절단용 공구의 에지형상을 대상으로 하여 특수하게 설계된 숫돌의 회전축을 피삭재의 높이방향으로 일정각도 경사시킴으로써 숫돌과 피삭재와의 사이에 형성되는 기하학적 상관관계를 이용하는 연삭법이다. 본 방식을 적용하면 연삭공정의 단축으로 인하여 에지형상의 쾌속제조가 가능하며, 에지의 정점부에 형성되는 버의 발생이 현저하게 감소된다. In this paper, a new grinding method for profiling the knife edge of cut-off tools was developed. In detail, for profiling the convex type edge shape, specially designed grinding wheel is tilted with some angle to the horizontal direction(i.e., tilted-head spindle grinding method) in order to give a specific geometrical relationships between wheel and workpiece. By utilizing this method, it is capable of efficient machining of precise knife edge by reducing the grinding process and lessening the burr formation at the top of edge in the conventional machining method.