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휘발성유기화합물가스에 대한 폴리아닐린 센서의 감도 향상
유준부,유비,임정옥,변형기,허증수,Yu, Joon-Boo,Liu, Fei,Lim, Jeong-Ok,Byun, Hyung-Gi,Huh, Jeung-Soo 한국재료학회 2007 한국재료학회지 Vol.17 No.8
Nano-structured polyaniline have been synthesized by interfacial polymerization method at room temperature. An aqueous solution of aniline in chloroform and another solution of ammonium peroxydisulfate in doping acid were prepared at different times terminated with methanol at room temperature. SEM, UV-vis were used to characterize the polyaniline with regard to their morphology and structure. The diameter and length of polyaniline can be controlled by the reaction time. Nano-structured polyaniline were found to have superior sensitivity for volatile organic compounds(VOCs). As the reaction time to increase from 30minute to 2hours the sensitivity were decreased to VOCs vapors. The sensitivity of Nano-structured polyaniline sensor appeared to VOCs better than the sensitivity of chemical synthesis sensors. The sensitivity of Nano-structured polyaniline sensor improved benzene vapors.
금속산화물센서의 이산화염소 가스에 대한 감지거동에 관한 연구
유준부 ( Joon-boo Yu ),변형기 ( Hyung-gi Byun ) 한국센서학회 2020 센서학회지 Vol.29 No.3
Chlorine dioxide is very effective gas for sterilization or disinfection (in manufacturing), and does not produce harmful by-products after use. However, if its concentration exceeds 10 %, it become explosive and cannot be compressed or stored. Therefore, it is necessary to measure its concentration. In this study, the concentration of chlorine dioxide with a high oxidizing strength was measured using a metal oxide sensor. The sensor was a commercially available TGS series from Figaro. The sensitivity of the sensor was inversely proportional to a low concentration of chlorine dioxide gas below 6 ppm and returned to the initial resistance at about 6 ppm. When the gas concentration reached multiples of 10 ppm, resistance of the sensor increased to several megaohms.
초음파 및 수열처리법에 의한 ZnO/SnO2 센서의 저농도 VOC 감응특성
유준부 ( Joon Boo Yu ),도승훈 ( Seung Hoon Do ),변형기 ( Hyung Gi Byun ),허중수 ( Jeung Soo Huh ) 한국센서학회 2012 센서학회지 Vol.21 No.6
The important factors in sensors are sensitivity, selectivity, and response time. Oxide semiconductors are high sensitivity, fast response and the advantage of miniaturization. Zn-doped SnO2 materials have been synthesized in order to improve the selectivity of the sensor. ZnO/ SnO2 crystals were prepared by a simple hydrothermal process and ultrasound pretreated hydrothermal process. ZnO/ SnO2 urchins were fabricated in the precursor solution with [Zn2+]:[Sn4+] ratio of 1:5 and rod structures were fabricated ratio of 1:1 and 1:3. Surface area ratio was increased by increasing the ratio of [Sn4+]. The sensitivity of sensors were highest at the [Zn2+]:[Sn4+] ratio of 1:5 in ethanol, acetaldehyde, toluene, and nitric oxide .
유준부 ( Joon Boo Yu ),이신엽 ( Shin Yup Lee ),전진영 ( Jin Young Jeon ),변형기 ( Hyung Gi Byun ),임정옥 ( Jeong-ok Lim ) 한국센서학회 2013 센서학회지 Vol.22 No.3
The exhaled breath contains gases generated from human body. When disease occurs in the body, exhaled breath may include gas components released from disease metabolism. If we can find specific elements through analysis of the exhaled gases, this approach is an effective way to diagnose the disease. The lung function has a close relationship with exhalation. Exhaled gases from COPD (Chronic Obstructive Pulmonary Disease) patients can be analyzed by gas chromatography-mass spectroscopy (GC-MS) and a gas sensor system. The exhaled breath for healthy person and COPD patients had different components. Significantly more benzendicarboxylic acid was detected from COPD patients than in healthy persons. In addition, patients had a variety of decane. Phosphorous compounds with different isomers were detected from patients. The results obtained by gas sensor system were processed by PCA (Principal Component Analysis). The PCA results revealed distinct difference between the patients and healthy people.
Impedance를 이용한 전도성고분자 센서의 에탄올 가스 감응특성
이경문,유준부,전희권,이병수,이덕동,허증수,Lee, Kyung-Mun,Yu, Joon-Boo,Jun, Hee-Kwon,Lee, Byung-Soo,Lee, Duk-Dong,Huh, Jeung-Soo 한국재료학회 2003 한국재료학회지 Vol.13 No.3
The polypyrrole and polyaniline thin film sensors which were made by chemical polymerization were employed to detect ethanol gas. With a single sensor element we can obtain characteristic patterns of behaviour across a very wide frequency range when measuring either resistance or capacitance. Impedance spectroscopy was employed to study the gas sensing behavior of both capacitance and resistance based sensors with conducting polymer as the active sensing element.
알츠하이머 진단을 위한 당성분에 민감한 초파리 세포기반 ISFET센서개발
임정옥 ( Jeong Ok Lim ),유준부 ( Joon Boo Yu ),권재영 ( Jae Young Kwon ),변형기 ( Hyung Gi Byun ),허증수 ( Jeung Soo Huh ),조원주 ( Won Ju Cho ) 한국센서학회 2013 센서학회지 Vol.22 No.4
In this study a biosensor was developed by using Drosophila cells expressing a gustatory receptor Gr5a and an ion sensitive field effect transistors (ISFETs) sensor device, which demonstrated significant compatibility with the Drosophila cells expressing Gr5a and their response to sugar. These results suggested that the newly developed cell based biosensor has a potential as a simple and easy screening device for Alzheimer`s disease in the future.
Wilks Lamda 방법을 이용한 화학센서 어레이 최적화
전진영 ( Jin Young Jeon ),유준부 ( Jeong Suk Shin ),신정숙 ( Joon Boo Yu ),변형기 ( Hyung Gi Byun ) 한국센서학회 2014 센서학회지 Vol.23 No.5
Optimizing the performance of a composite sensor array is necessary when the number of sensors to choose from is large. In this paper, we present a chemical sensors array optimization method using Wilks Lamda algorithm applicable a device to detect low concentration of alcohol from driver’s exhale breath for interlocking engine ignition preventing drink-driving. More than 20 chemical sensors fabricated different synthetic stuffs and heater temperatures by collaborators were nominated, 5 sensors were selected for optimal sensors array using the method, and alcohol samples were well discriminated from the interference gases inside the vehicle. It has been confirmed by Principal Component Analysis (PCA).
전도성 고분자 센서 어레이를 이용한 휘발성 유기 화합물 가스 인식
이경문,주병수,유준부,황하룡,이병수,이덕동,변형기,허증수 한국센서학회 2002 센서학회지 Vol.11 No.5
휘발성 유기 화합물 가스(Volatile Organic Compounds)를 인식하고 분석하기 위하여 전도성 고분자 센서어레이를 이용한 시스템을 제작하였다. Polypyrrole와 Polyaniline을 화학중합법으로 센서에 전도성고분자막을 형성하였고 이를 통해 VOC 검지용 센서 어레이를 제작하였다. 센서어레이로부터 측정되는 다차원 데이터는 주성분분석법(PCA)과 RBF(Radial Basis Function Network)을 이용하였다. 제안된 시스템으로 VOCs 가스를 인식하는데 있어서 RBF Network이 PCA방식보다 더욱 효율적인 것으로 판단되었다. We fabricated gas recognition system using conducting polymer sensor array for recognizing and analyzing VOCs(Volatile Organic Compounds) gases. The polypyrrole and polyaniline thin film sensors which were made by chemical polymerization were employed to detect VOCs. The multi-dimensional sensor signals obtained from the sensor array were analyzed using PCA(principal component analysis) technique and RBF(radial basis function) Network. Throughout the experimental trails, we confirmed that RBF Network is effective than PCA technique in identifying VOCs.