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PEDOT:PSS기반 잉크젯 프린팅 스트레인 게이지의 제작
계지원 ( Ji Won Kye ),한동철 ( Dong Cheul Han ),신한재 ( Han Jae Shin ),염세혁 ( Se-hyuk Yeom ),이왕훈 ( Wanghoon Lee ) 한국센서학회 2017 센서학회지 Vol.26 No.1
This paper presents the Inkjet-printed strain gauge using PEDOT:PSS. The strain gauge (width 0.6 mm, length 20 mm, thickness 0.3 μm) was printed on the PET film using PEDOT:PSS ink. The resistance variation of the fabricated strain gauge was measured by the digital multi-meter with the displacement range of -4 to 10 mm. As the measured result, resistance variation (ΔR/R<sub>0</sub>) has approximately 0.75%, linearity of 99.87%. The fabricated strain gauge is expected to the various applications such as tape type pressure sensor, PMS(pressure mapping sensor), wearable devices.
잉크젯 프린팅 기술을 이용한 플렉서블 온,습도센서 개발
계지원 ( Ji Won Kye ),한동철 ( Dong Cheul Han ),신한재 ( Han Jae Shin ),김헌곤 ( Heon Gon Kim ),이왕훈 ( Wang Hoon Lee ) 한국센서학회 2015 센서학회지 Vol.24 No.2
This paper presents the inkjet-printed flexible temperature and humidity sensor(F-TH sensor) using PEDOT:PSS. The series, mesh and parallel type sensing element using PEDOT:PSS ink was printed on the overhead projector(OHP) film. The fabricated sensor of each structure has the temperature sensitivity of 140 Ω/℃, 29 Ω/℃ and 1.4 Ω/℃ with linearity, respectively. Also the fabricated sensor was not only possible to measure a temperature, but also to detect humidity. The humidity sensitivity of 400 Ω/%RH, 3.4 Ω/%RH and 3 Ω/%RH with linearity, respectively. The fabricated F-TH sensor is expected for the various applications such as electronic devices, bio-healthcare, industrial field.
용매열처리에 따른 PEDOT:PSS 암모니아 가스 감지막 특성 변화
노왕규 ( Wang Gyu Noh ),염세혁 ( Se-hyuk Yeom ),이왕훈 ( Wanghoon Lee ),신한재 ( Han Jae Shin ),계지원 ( Ji Won Kye ),곽기섭 ( Giseop Kwak ),김세현 ( Se Hyun Kim ),류시옥 ( Si Ok Ryu ),한동철 ( Dong Cheul Han ) 한국센서학회 2017 센서학회지 Vol.26 No.2
Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) has been extensively studied as the active material in ammonia gas sensor because of its fast response time, high conductivity and environmental stability. It is well known that a post annealing process for organic devices based on PEDOT:PSS significantly increases the device performance. In this study, we propose the solvent annealing of PEDOT:PSS and investigated its effects. As a results, post solvent annealing on PEDOT:PSS lead to the surface chemical and physical properties change. These changes result in improved conductivity of the PEDOT:PSS. In additional, ammonia sensitivity of solvent annealed PEDOT:PSS become higher than pristine polymer film. The enhancement is mainly caused by the depletion of gas barrier PSS and structural re-forming PEDOT networks. We believe that the post solvent annealing is a promising method to achieve highly sensitivity PEDOT:PSS films for applications in efficient, low-cost and flexible ammonia gas sensor.