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전도성 카본 잉크를 이용한 직류 저항형 습도센서 제작 및 평가
안태창 ( Taechang An ) 한국센서학회 2017 센서학회지 Vol.26 No.6
A DC resistance type humidity sensor using conductive carbon ink was fabricated and its performance was evaluated. The humidity sensor was fabricated using a screen printing technique and have a structure that does not require additional metal electrodes to measure resistance change. To evaluate the performance of the humidity sensor, we measured the DC resistance change under various relative humidity levels. The fabricated humidity sensor showed a resistance change of about 2.5 ~ 50 kΩ in 11 ~ 95% RH environment. It also shows a linear relationship in the relative humidity versus log DC resistance graph. In comparison with commercial humidity sensor under real environment, it can be confirmed that the resistance of the humidity sensor changes to almost the same level as the measured humidity. These results show that the resistance type humidity sensor can be operated stably in actual environment.
김도형 ( Dohyeong Kim ),안태창 ( Taechang An ) 한국센서학회 2016 센서학회지 Vol.25 No.3
The superhydrophobic and superoleophobic meshes surfaces have been used in various applications such as self-cleaning, anti-icing, gas exchange, oil-water separation, sound-wave penetrable anti-wetting structures, etc. In particular, there are many studies for oil-water separation with environmental issues. Because of high pressure and dynamic environment, oil-water separation filters must have stable surface properties as super-hydrophobicity and superoleophobicity. The oleophobicity of surface depends on the surface chemistry and roughness of the surface. The roughness of oleophobic surface enhances its static contact angle and stability. The multi-scale hierarchical structure provides a stable superhydrophobic state by maintaining a Cassie state. In this research, we fabricated a superoleophobic mesh with a multi-scale hierarchical structure to increase the pressure resistance and adjusted a size of the mesh hole.
김건휘(Geon Hwee Kim),안태창(Taechang An) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.10
웨어러블 디바이스에는 센서, 디스플레이, 투명/유연 전극 등 여러 부품들이 사용된다. 이러한 부품들에서 필수적으로 필요한 기술은 전도층을 제작하는 것이다. 각각의 용도에 맞게 투과도와 전기전도도를 적절히 조절하며 전도층을 제작하는 기술의 확보가 필수적이다. 또한 일상 생활에서 생길 수 있는 정도의 자극에 대해 큰 변화가 없는 전기적 특성을 유지하는 것도 필수적이다. 이를 달성하기 위해 본 연구에서는 아주 긴 형태의 금속 나노섬유 네트워크를 제작하여 투명전극을 제작하였다. 제작한 투명전극은 전기전도도, 투과도를 능동적으로 조절할 수 있었을 뿐만 아니라 우수한 접합특성을 가지고 있음을 확인하였으며 수 만회의 bending에 대해서도 저항변화가 크지 않음을 확인할 수 있었다. Various components are used in wearable devices, such as sensors, displays, and transparent/flexible electrodes. An essential skill in these parts is to fabricate the conductive layer. It is essential to secure the technology to produce a conductive layer while appropriately adjusting the transmittance and electrical conductivity for each application. It is also essential to maintain electrical characteristics that do not change significantly in response to stimuli that may occur in daily life. To achieve this, in this study, a very long metal nanofiber network was fabricated to fabricate a transparent electrode. It was confirmed that the fabricated transparent electrode was able to actively control electrical conductivity and transmittance, as well as having excellent bonding characteristics. It was also confirmed that resistance change was not large even after tens of thousands of bending.