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4차 산업혁명의 측정소자 개발을 위한 나노 탄소 스트레인 센서 제작과 그 응용
강인필(Inpil Kang),김광희(Kwang-Heui Kim) 대한기계학회 2018 大韓機械學會論文集A Vol.42 No.2
본 논문에서는 4차 산업혁명의 핵심인 측정소자 개발을 위한 나노 탄소 스트레인 센서(Nano-Carbon Strain Sensor, NCSS)의 제작 및 특성과 그 응용을 기술하였다. NCSS는 나노 탄소 소재를 기반으로 하는 전왜성 복합소재(Nano Carbon Piezoresistive Composite, NCPC)로 제작된다. 따라서 NCSS는 인쇄전자 방식이나 3D 프린팅 적층가공 기술을 활용하여 제작될 수 있을 뿐만 아니라 혼합 소재의 선택에 따라 유연성을 부여할 수도 있다. 이로 인하여 다양한 재질과 형상의 구조형 센서들이 자유롭게 설계되고 경제적으로 제작 할 수 있으리라 기대된다. In this paper, we describe the fabrication and characteristics of Nano-Carbon Strain Sensor (NCSS) for the development of sensing device, which is the key technology of the fourth industrial revolution. NCSS is made of Nano-Carbon Piezoresistive Composite (NCPC) based on carbon nanomaterials. Consequently, NCSS can be fabricated using printing electronic or 3D printing additive manufacturing technology. In addition, it can be flexible depending on the choice of mixed materials. Therefore, it is expected that structural sensors with various materials and shapes can be liberally designed and manufactured economically.
고정렬 Pt 라인 및 크로스-바 미세패턴의 구조적 안정성 연구
박태완,박운익,Park, Tae Wan,Park, Woon Ik 한국전기전자재료학회 2018 전기전자재료학회논문지 Vol.31 No.7
This study discusses and demonstrates the structural stability of highly ordered Pt patterns formed on a transparent and flexible substrate through the process of nanotransfer printing (nTP). Bending tests comprising approximately 1,000 cycles were conducted for observing Pt line patterns with a width of $1{\mu}m$ formed along the direction of the horizontal (x-axis) and vertical (y-axis) axes ($15mm{\times}15mm$); and adhesion tests were performed with an ultrasonicator for a period greater than ten minutes, to analyze the Pt crossbar patterns. The durability of both types of patterns was systematically analyzed by employing various microscopes. The results show that the Pt line and Pt crossbar patterns obtained through nTP are structurally stable and do not exhibit any cracks, breaks, or damages. These results corroborate that nTP is a promising nanotechnology that can be applied to flexible electronic devices. Furthermore, the multiple patterns obtained through nTP can improve the working performance of flexible devices by providing excellent structural stability.
Transparent and Flexible Photon Sieve Made with Cellulose Nanofiber by Micro-Nano Structure Molding
김현찬,Lindong Zhai,Pooja S. Panicker,김현정,David MacDonnell,김재환 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.9 No.4
Conventionally, the photon sieve (PS) was made of chrome-coated fused silica and quartz plates. However, fused silica and quartz plates have a size limitation due to their weight and fragility. A membrane PS is attractive since it is lightweight, large size, flexibility and deployable. This paper demonstrates the new concept of membrane PS based on cellulose nanofiber (CNF). The CNF-based PS (CNF-PS) is transparent, flexible, lightweight, and has high strength and toughness. This study highlights the PS fabrication on a CNF fi lm using a micro-nano structure molding technique and its structural stability in an external environmental change. For the first time in literature, through a high vacuum (5 × 10 –8 Torr) environment test, it was shown that CNF has emerged as a promising optical material. Furthermore, the prepared CNF-PS exhibited high beam quality. This study explained the complete research strategy from the isolation of cellulose nanofibers to its PS application. The new concept of CNF-PS will accelerate its broad application to thin and compact photonic devices.
Habibur, Rahaman Md,Yaqoob, Usman,Muhammad, Sheeraz,Uddin, A.S.M.Iftekhar,Kim, Hyeon Cheol Elsevier 2018 Materials chemistry and physics Vol.215 No.-
<P><B>Abstract</B></P> <P>This study explores the role of RGO in improving the energy harvesting potentiality of P(VDF-TrFE) matrix without applying the conventional polling process. Five different piezoelectric sheets were prepared by varying the RGO contents in P(VDF-TrFE) matrix to realize its optimum concentration in the matrix. The effect of RGO on the electroactive polar beta (<I>β</I>) phase of P(VDF-TrFE) was investigated through the X-ray diffraction (XRD) pattern and the Fourier transform infrared spectroscopy (FT-IR). To elaborate the RGO role, dielectric properties of the as-prepared piezoelectric sheets were also checked over the frequency range of 1 kHz–100 kHz at room temperature. Finally, these piezoelectric sheets were used to fabricate the piezoelectric nanogenerators (PENGs) devices. Among the fabricated PENGs, the PENG with 0.1% RGO contents reveals the maximum open circuit voltage of 2.4 V and highest peak of short-circuit current around 0.8 μA at an applied force of 2 N. Moreover, it exhibits the highest output power of 3.2 μW at 1.8 MΩ load resistance, all the outputs were recorded without applying polling process. It was estimated that our fabricated self-poled, flexible piezoelectric nano-generator can be a useful candidate to powering futuristic nano-devices.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The effect of RGO nanosheets on the electroactive polar <I>β</I> phase of P(VDF-TrFE) was explored. </LI> <LI> RGO nanofillers act as a polling medium in the P(VDF-TrFE) matrix. </LI> <LI> Enhancement in energy harvesting was observed with increasing of RGO concentration. </LI> </UL> </P>
수열합성법으로 PES 기판에 성장된 Mg-doped ZnO 나노막대의 구조 및 전기적 특성에 관한 연구
오재현,박세현,장낙원,김홍승 한국물리학회 2017 새물리 Vol.67 No.9
For the fabrication of a wearable flexible ultraviolet photodetector device, Mg-doped ZnO was studied. MgZnO nanorods were grown using the hydrothermal synthesis method, which can grow MgZnO at low temperature on a polyether sulfone (PES) substrate. The MgZnO nanorods showed a crystal structure in which hexagonal MgZnO and cubic MgZnO were mixed as Mg was doped. The MgZnO nanorods doped with 3 at% Mg showed the best crystallinity, and the sheet resistance value was 76 $\Omega/$□. An ultraviolet (UV) photodetector fabricated using the MgZnO nanorods had a maximum current of 1.9 $\mu$A at a 1 V applied voltage in a UV irradiation environment, a rise time of 21 seconds, a decay time of 17 seconds, and an on/off current ratio value of 1.96 $\times$ 10$^2$. 인체에 부착할 수 있는 유연 자외선 광검출기 소자를 제작하기 위하여 ZnO에 Mg를 도핑한 MgZnO에 대한 연구를 수행하였다. 유연한 소자를 제작하기위해 PES (polyether sulfone) 기판을 사용하였으며 저온에서 MgZnO의 성장이 가능한 수열합성법을 이용하여 MgZnO 나노막대를 성장시켰다. MgZnO 나노막대는 Mg가 도핑됨에 따라 육방정계 MgZnO와 입방정계 MgZnO가 혼재해 있는 결정 구조를 보였다. Mg이 3 at% 도핑된 MgZnO 나노막대가 결정성이 가장 우수하였고 면저항값은 76 $\Omega/$□로 나타났다. MgZnO 나노막대를 이용하여 제작된 자외선 광검출기는 UV 조사 환경에서 1 V 인가전압에서 최대 전류는 1.9 $\mu$A이고, 상승 시간은 21초, 감쇠 시간은 17초, on/off 전류비 값은 1.96 $\times$ 10$^2$로 측정되었다.