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폴리우레탄을 이용한 ISFET 요소센서의 제작 및 특성
최성문,손병기,김의락 ( Sung Moon Choi,Byung Ki Sohn,Ui Rak Kim ) 한국센서학회 1993 센서학회지 Vol.2 No.1
An ISFET urea sensor was fabricated by immobilizing the urease using polyurethane on the H^+ sensing Si₃N₄ thin film of pH-ISFET. The sensor could determine the urea concentration 1∼50 mg/dl with fast response of 3∼5 min. and good repeatability. For its application to clinical analysis, the results of the urea measurements in blood plasma using ISFET urea sensor were compared with these of conventional Urease-Indophenol method.
PVA-SbQ 고분자 물질을 이용한 ISFET 尿素센서
최성문,김창수,남동현,손병기,김의락,Sung Moon Choi,Chang-Soo Kim,Dong-Hyun Nam,Byung-Ki Sohn,Ui-Rak Kim 대한화학회 1992 대한화학회지 Vol.36 No.4
반도체 수소이온센서인 pH-ISFET를 제조 하고, 이를 ISFET 요소 센서로 이용하기 위하여 pH-ISFET의 Si$_3$$N_4$ 막 위에 요소 분해효소인 urease를 감광성 고분자 물질인 PVA-SbQ를 이용하여 고정화하였다. 제조된 센서는 빠른 응답특성과 우수한 재현성을 보였으며, 약 1∼50 mg/dl의 요소농도를 정량할 수 있었다. 또한 그 임상적용을 위한 기초연구로서 혈액 중에 존재하는 여러 가지 물질들이 센서의 출력에 미치는 영향을 조사하였으며, 혈장의 요소농도를 측정하여 현재 실용되고 있는 분광광도법의 결과와 비교하였다. An ISFET urea sensor was fabricated by immobilizing the urease using photosensitive polymer, poly(vinyl alcohol)-SbQ on the H$^+$ sensing $Si_3$$N_4$ thin film of pH-ISFET. The sensor could determine the urea concentration in the range of 1∼50 mg/dl with fast response and good repeatability. For its application to clinical analysis, the interferences of the various materials which cause inhibition in urease catalytic reactions in blood was investigated. The results of the urea measurements in blood plasma using the ISFET urea sensor were compared with these of conventional spectrophotometric method.
Sol - Gel 방법을 이용한 FET 형 전해질 센서의 제작 및 특성
문수영,조병욱,김창수,고광락,손병기 ( S . Y . Moon,B . W . Cho,C . S . Kim,K . N . Koh,B . K . Sohn ) 한국센서학회 1998 센서학회지 Vol.7 No.4
PVC membrane, which has been used for membrane of electrolyte sensors, shortened sensor lifetime due to poor adhesion to sensor surface and exhibited difficulty in standardization and mass-production. To overcome these problems, the membrane solution was prepared with neutral carrier, matrix(TEOS:DEDMS=1:3), solvent(ethanol), and a catalyzer(HCl). The fabricated electrolyte sensors showed typical electrical characteristics of MISFET (metal-insulator-semiconductor field-effect transistor). The K-, Ca- and Na-ISFETs showed sensitivity of 53, 2b and 50 mV/decade in wide concentration range, respectively. The response time was about 90 seconds and the drift was 0.05mV/hour. These results suggest that the sol-gel method and the lift-off technique can be applied to formation of membranes and expected to improve mass-productivity, standardzation of the sensors.