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단층 탄소나노튜브의 암모니아 가스에 대한 감응특성과 열처리 효과
허증수,이상태,김민주,윤광현,Huh J. S,Lee S. T,Kim M. J,Yun K. H 한국재료학회 2004 한국재료학회지 Vol.14 No.4
Carbon nanotubes(CNT) were synthesized by arc-discharge method. To fabricate CNT sensor, CNT powder was dispersed in $\alpha$-Terpinol($C_{10}$ $H_{17}$OH) solution. The CNT films were fabricated by screen printing on the interdigitated Pt/Pd alloy electrode. The microstructure of CNT film were observed by scanning electron microscopy (SEM). In order to investigate the gas sensing characteristics of the film, the CNT film was experimented to measure NH$_3$ response and recovery time. And this sensor shows better reproductibility and faster recovery time than another CNT sensors. We suggest the possibility to utilize a CNT as new sensing materials for environmental monitoring.
A Study of Vision Biomembrane Assembly using Photoreactive Protein Adsorbed Polypyrrole Film
허증수,임정옥 한국센서학회 2000 센서학회지 Vol.9 No.3
A protein based vision biomembrane was fabricated by adsorbing bacteriorhodopsin into electrochemically polymerized polypyrrole film substrate mainly through strong electrostatic interaction. The immobilized bacteriorhodopsin on the polypyrrole film was demonstrated by SEM and SRET. The light signal transducing function from the bacteriorhodopsin which was adsorbed into polypyrrole film was evaluated by electroretinogram(ERG). A wave form analysis of the electroretinogram indicated that the adsorbed bacteriorhodopsin retained its activity and light signal was obtained from the protein for at least one month.
허만일,안선희,김휘강,송윤정,최은창,안상현,최우성,허증수,임정옥 한국조직공학과 재생의학회 2016 조직공학과 재생의학 Vol.13 No.1
Full skin auto-grafts are required for reconstruction of skin burns and trauma scars. However, currently available clinical approaches such as sheet skin graft, mesh skin grafts, artificial skin graft, and in vivo skin expansion have limitations due to their potential danger for secondary damage and scar formation at the donor site, and discomfort during skin expansion. We developed an advanced bioreactor system and evaluated its function in skin expansion using porcine full skin. The reactor was designed as a pneumatic cylinder type, was programmed to adjust the pressure and the operating time. The system was composed of culture chamber unit, environmental control unit, and monitoring unit. Skins were expanded at 200 kPa pneumatic force and the expanded skins were analyzed by immunohistochemistry and histology. Furthermore we carried out auto-grafting experiment of the expanded skins in vivo using Yucatan pigs and skins were harvested and histologically analyzed after 8 weeks. The results showed that the bioreactor expanded skins to 160% in 4 hours. Histological analysis of the expanded skins revealed that epidermal cells and dermal fibroblasts were viable and remained integrity. The results of auto-grafting experiment indicated that fibrosis and scars were not detected in the grafted skins. This study demonstrates that the newly developed skin bioreactor enabled to obtain large sized full skin rapidly and successful grating.
위장 속 냄새분별을 위한 membrane 제작 및 모니터링 시스템 개발
이덕동,허증수,이윤수,주병수,임채근,김병태 경북대학교 전자기술연구소 2001 電子技術硏究誌 Vol.22 No.2
In present, prevention and early detection of the disease are the most important and effective strategies for human health. Stomach cancer respectively produce a aceton odor and ammonia odor. Accordingly, quantitative and qualitative analysis of odor can be a effective means for early diagnosis and detection of diseases. To get a reliable electronic nose system, the sensor array consisted of conducting polymer materials as the base material, which were synthesized by chemical and electrochemical polymerization method using monomer(pyrrole, aniline, thiophene) and some dopants on a substrate with comb type electrode. They have good selectivity and sensitivity for various odorss. The microstructure of sensing materials was analyzed using UV-Vis-NIR and SPM. Each sensor has been characterized by electrical measurements for odors in a various concentration range.