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장은윤 ( Eun Yoon Jang ),염세혁 ( Se Hyuk Yeom ),엄년식 ( Nyeon Sik Eum ),한정현 ( Jung Hyun Han ),김형경 ( Hyung Kyung Kim ),신용범 ( Yong Beom Shin ),강신원 ( Shin Won Kang ) 한국센서학회 2013 센서학회지 Vol.22 No.2
In this research, we developed a biosensor to detect lung cancer-specific biomarker using Anodic Aluminum Oxide (AAO) chip based on interference and nano surface plasmon resonance (nanoSPR). The nano-porous AAO chip was fabricated 2 μm of pore-depth by twostep anodizing method for surface uniformity. NanoSPR has sensitivity to the refractive index (RI) of the surrounding medium and also provides simple and label-free detection when specific antibodies are immobilized to the Au-deposited surface of nano porous AAO chip. To detect the lung cancer-specific biomarker, antibodies were immobilized on the surface of the chip by Self Assembled Monolayer (SAM) method. Since then lung cancer-specific biomarker was applied atop the antibodies immobilized layer. The specific reaction of the antigen-antibody contributed to the change in the refractive index that cause shift of resonance spectrum in the interference pattern. The Limit of Detection (LOD) was 1 fg/ml by using our nano-porous AAO biosensor chip.
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.
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.