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전기화학적 특성 개선을 위해 Pt 나노구조를 가지는 미세전극 제작
우현수(Hyeonsu Woo),김수현(Suhyeon Kim),김강현(Kanghyun Kim),윤승빈(Seungbin Yoon),안태창(Taechang An),김건휘(Geon Hwee Kim),임근배(Geunbae Lim) 대한기계학회 2021 大韓機械學會論文集B Vol.45 No.5
공간해상도가 우수한 미세전극은 그 작은 크기로 인해 임피던스와 노이즈가 증가하는 한계가 있다. 따라서 고성능의 미세전극을 개발하기 위해서는 공간해상도와 임피던스 특성을 동시에 개선할 수 있는 표면처리 기술의 개발이 필요하다. 본 연구에서는 전기화학도금을 이용하여 미세전극 표면에 수십 nm 크기의 Pt 나노구조물을 제작하였다. Pt 나노구조로 표면개질된 미세전극은 개질하기 전의 미세전극과 비교하여 임피던스 수치가 평균 86% 감소하였다. 또한, CSC 측정과 EIS 분석, 임피던스 등가회로 모델링을 통해 Pt 나노구조를 가지는 미세전극의 개선된 전기화학적 특성을 확인하였다. 본 연구에서 제안한 표면개질 기술은 기존의 제작된 전극에도 적용 가능한 후처리 기술로 다양한 구조와 재료를 가진 미세전극에 적용할 수 있다. Microelectrodes with excellent spatial resolution have a limit of large impedance and noise. Therefore, to develop a high-performance microelectrode, it is necessary to develop a surface modification technology that can simultaneously improve spatial resolution and the impedance characteristics. In this study, Pt nanostructures of several tens of nanometers were synthesized on the surface of microelectrodes via electrochemical deposition. The impedance value of the Pt nanostructure-based surface-modified microelectrode was reduced by an average of 86%, compared with that of the bare microelectrode. In addition, through the CSC measurement, EIS analysis, and impedance equivalent circuit modeling, the improved electrochemical properties of Pt nanostructure-based modified microelectrodes were confirmed. The surface modification used in this study is a post-processing technology that is utilized for prefabricated electrodes, and it can be applied to microelectrodes with various structures and materials.
2단계 수열합성을 이용한 ZnO 계층 나노구조 기반 UV 센서 제작
우현수 ( Hyeonsu Woo ),김건휘 ( Geon Hwee Kim ),김수현 ( Suhyeon Kim ),안태창 ( Taechang An ),임근배 ( Geunbae Lim ) 한국센서학회 2020 센서학회지 Vol.29 No.3
Ultraviolet (UV) sensors are widely applied in industrial and military fields such as environmental monitoring, medicine and astronomy. Zinc oxide (ZnO) is considered as one of the promising materials for UV sensors because of its ease of fabrication, wide bandgap (3.37 eV) and high chemical stability. In this study, we used the hydrothermal growth of ZnO to form two types of ZnO nanostructures (Nanoflower and nanorod) and applied them to a UV sensor. To improve the performance of the UV sensor, the hydrothermal growth was used in a two-step process for fabricating ZnO hierarchical nanostructures. The fabricated ZnO hierarchical nanostructure improved the performance of the UV sensor by increasing the ratio of volume to surface area and the number of nanojunctions compared to onestep hydrothermal grown ZnO nanostructure. The UV sensor based on the ZnO hierarchical nanostructure had a maximum photocurrent of 44 μA, which is approximately 3 times higher than that of a single nanostructure. The UV sensor fabrication method presented in this study is simple and based on the hydrothermal solution process, which is advantageous for large-area production and mass production; this provides scope for extensive research in the field of UV sensors.
Poly-dimethylsiloxane (PDMS) 기판 위에 형성된 나노구조를 이용한 시각 인장센서의 개발
김건휘 ( Geon Hwee Kim ),우현수 ( Hyeonsu Woo ),임근배 ( Geunbae Lim ),안태창 ( Taechang An ) 한국센서학회 2018 센서학회지 Vol.27 No.6
Structural color has many advantages over pigment based color. In recent years, researches are being conducted to apply these advantages to applications such as wearable devices. In this study, strain sensor, a kind of wearable device, was developed using structural color. The use of structural color has the advantage of not using energy and complex measuring equipment to measure strain rate. Wrinkle structure was fabricated on the surface of Poly-dimethylsiloxane (PDMS) and used it as a sensor which color changes according to the applied strain. In addition, a transmittance-changing sensor was developed and fabricated by synthesizing additional glass nanoparticles. Furthermore, a strain sensor was developed that is largely transparent at the target strain and opaque otherwise.