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화학 및 생물센서 : 휘발성 유기 화합물 가스 측정을 위한 전도성 고분자 센서의 제조 및 감응 특성
백지흠(J . H . Paik),황하룡(H . R . Hwang),노진규(J . G . Roh),허증수(J . S . Huh),허덕동(D . D . Lee),임정옥(J . O . Lim),변형기(H . G . Byun) 한국센서학회 2001 센서학회지 Vol.10 No.2
Conducting polymer sensors show high sensitivity when exposed to volatile organic compounds gases at room temperature. The 8 sensor array using by polypyrrole and polyaniline has been fabricated by chemical polymerization for measuring sensing characteristics of VOCs gases. Conducting polymer was polymerized by using distilled pyrrole, aniline as a monomer and ammonium persulfate (APS) as an oxidant and dodecylbenzene sulfonic acid (DBSA) as a dopant. Dedoped film was synthesized by reverse voltage and redoped film was synthesized by using 1-octanesulfonic acid sodium salt as another dopant in electrochemical cell. The sensitivity and reversibility were influenced by doping, dedoping, redoping and thiclrness for the polypyrrole and polyaniline. We investigated the relation between the structure of conducting polymer and sensitivity of these sensors through the analysis of scanning electron microscope (SEM), scanning probe microscope (SPM) and α-step.
신동원,이상태,전희권,이덕동,임정옥,허증수,Shin, D.W.,Lee, S.T.,Jun, H.K.,Lee, D.D.,Lim, J.O.,Huh, J.S. 한국재료학회 2003 한국재료학회지 Vol.13 No.2
Nano-sized powders of Indium Tin Oxide(ITO) were synthesized by a coprecipitation method. In order to investigate the gas sensing characteristics in the nanocrystalline ITO thick films with various particle sizes, ITO powders with the average particle diameter of 15, 30, and 70 nm respectively were synthesized. And the sensitivity of ITO thick films was measured upon exposure to a target gas($C_2$$H_{5}$ /OH) and some other Volatile Organic Compounds(VOCs), such as, toluene, methanol, benzene, chloroform. As a result, ITO thick films had high sensitivity for ethanol and higher sensitivity with smaller particle size.
Electrochromic 막의 특성과 물질이동 방지막의 효과에 대한 연구
황하룡(H. R. Hwang),백지흠(J. H. Paik),허증수(J. S. Huh),이덕동(D. D. Lee),임정옥(J. O. Lim),장동식(D. S. Jang) 한국진공학회(ASCT) 2000 Applied Science and Convergence Technology Vol.9 No.3
졸겔법 및 진공증착법으로 WO₃ 및 V₂O_5 박막을 제조하고, 리튬이온을 이용하여 전기변색 소자를 제작한 후 광학적 특성을 조사하였다. 측정결과 졸겔법으로 제조된 WO₃ 박막과 V₂O_5 박막을 수증기 분위기에서 500℃로 1시간 열처리한 경우 가장 우수한 투과율 변화량을 나타내었다. 정ㆍ역방향 동작을 거듭할수록 WO₃ 막의 텅스텐과 ITO막의 인듐이 상호 확산하는 것을 관찰할 수 있었으며, 이를 방지하기 위해 수백 Å의 텅스텐 박막을 ITO와 WO₃막 사이에 삽입한 결과, cyclic voltamogram의 peak의 감소량이 1/10 이하로 감소하였으며, 리튬이온의 흐름에 의한 인듐과 텅스텐의 이 동을 효과적으로 방지할 수 있었다. After manufacturing the electrochromic device (structure: ITO glass/WO₃/electrolyte/V₂O_5/ITO glass) by using of sol-gel process and evaporation, optical properties and migration effect were investigated. The result shows that electrochromic device with heat treated (at water vapor ambient, 500℃, 1 hour) sol-gel coated WO₃ and V₂O_5 films had the highest transmittance variance. Electrochromic devices are based on the reversible insertion of guest atoms into structure of the host solid. But after cyclic operation, we find that the tungsten in WO₃ film and the indium in ITO film were migrated with each other. For the purpose of blocking migration, tungsten barrier film is inserted between ITO and WO₃ film. The result of cyclic voltamogram and the Auger depth profile show that the peak separation of cyclic voltamogram is reduced to below 1/10 and we could effectively block the indium and tungsten migration that is caused by flow of Li ions.
權澤孚,宋貞玉,申東春,林正均 최신의학사 1976 最新醫學 Vol.19 No.4
Chronic myelocytic leukemia is one of rare type of leukemia in childhood. Frequent presenting initial symptoms are intermittent fever with unknown origin, abdominal distention, .hepatosplenomegaly, bleeding tendency, recurrent infection and generalized lymphadenopathy. The case was ten years old male child who was admitted with symptoms of abdominal distention, fever, and hepatosplenomegaly. He was confirmed by bone marrow aspiration and hematologic studies. We reviewed the literature about the etiology incidence, clinical symptoms, physical findings, hematologic findings, prognosis and management of chronic myelocytic leukemia briefly.