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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.
Methanol 가스에 대한 고분자 센서의 온도와 습도 영향 고찰
이경문,허용수,전희권,손성옥,허증수,Lee, K.M.,Hoh, Y.S.,Jun, H.K.,Sohn, S.O.,Huh, J.S. 한국재료학회 2003 한국재료학회지 Vol.13 No.12
The polypyrrole prepared with pyrrole monomer, APS and DBSA was synthesized by chemical Polymerization at $V^{\circ}C$ under atmosphere conditions. After dissolving polypyrrole powder to the chloroform including DBSA, polypyrrole film was prepared on the alumina substrate with an interdigitated electrode by using the dip-coating method. This film was soaked in methanol solvent for 1 h at room temperature and heated to $70^{\circ}C$ for 4 h in $N_2$. Initial resistance was increased with the increasing humidity and decreasing temperature. The sensitivity was increased with lower humidity and decreasing temperature. The best linearity was achieved at $25^{\circ}C$ and low humidity of 0%.
SnO<sub>2</sub>센서의 ZnO 첨가량에 따른 di(propylene glycol) methylether (DPGME)에 대한 반응 특성
차건영,백원우,윤기열,이상태,최낙진,이덕동,허증수,Cha G. Y,Baek W. W,Yun K. Y,Lee S. T,Choi N. J,Lee D. D,Huh J. S 한국재료학회 2004 한국재료학회지 Vol.14 No.3
Respectively the powder made of ZnO added $SnO_2$ was prepared by coprecipitation method and the thick film gas sensor was fabricated by screen-printing technique, The morphology and phase of the powder and film was investigated by SEM and XRD. The specific area of the particle was linearly increased with ZnO contents. Target gas was di(propylene glycol) methylether ($CH_3$($OC_3$$H_{6}$ )$_2$OH, DPGME), which is simulant gas of blister gas. The gas sensing characteristics for DPGME were examined with flow type measurement system and the concentrations of target gas were controlled from 500 ppb to 1500 ppb. ZnO (2 wt%) added $SnO_2$ showed maximum sensitivity to DPGME at $300^{\circ}C$.
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.
스크린 인쇄법을 이용한 NASICON 후막 SO<sub>2</sub>가스 센서의 제조 및 특성
배재철,이상태,전희권,방영일,이덕동,허증수,Bae, J.C.,Lee, S.T.,Jun, H.K.,Bang, Y.I.,Lee, D.D.,Huh, J.S. 한국재료학회 2003 한국재료학회지 Vol.13 No.2
The thick film type sensor having Pt/Na Super Ionic Conductor(NASICON) solid electrolyte/Pt/$Na_2$$SO_4$/Pt catalyst system for $SO_2$gas was fabricated by screen-print method. The phase of Na Super Ionic Conductor solid electrolyte sintered at different temperature of 1050, 1150,$ 1250^{\circ}C$ and for different time of 1.5, 2.5, 3.5 hr were investigated by XRD. The Electromotive Force variation of the sensor with $SO_2$concentrations and operating temperatures were investigated. The major phase of Na Super Ionic Conductor film sintered at 115$0^{\circ}C$ for 3.5 hr was sodium zirconium silicon phosphate($Na_3$Zr$_2$$Si_2$PO$_{12}$). The Nernst's slope of Na Super Ionic Conductor sensor for $SO_2$gas with the variation of concentration from 10 to 100 ppm was 167.14 ㎷/decade at the operating temperature of $500 ^{\circ}C$. The increase of oxygen partial pressure was not affected to the variation of Nernst's slope.e.
신동원,이상태,전희권,이덕동,임정옥,허증수,Shin, D.W.,Lee, S.T.,Jun, H.K.,Lee, D.D.,Lim, J.O.,Huh, J.S. 한국재료학회 2003 한국재료학회지 Vol.13 No.2
Nano-sized powders of Indium Tin Oxide(ITO) were synthesized by a coprecipitation method. In order to investigate the gas sensing characteristics in the nanocrystalline ITO thick films with various particle sizes, ITO powders with the average particle diameter of 15, 30, and 70 nm respectively were synthesized. And the sensitivity of ITO thick films was measured upon exposure to a target gas($C_2$$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.
Fe<sub>2</sub>O<sub>3</sub>후막을 이용한 alcohol sensor 제작 및 감응특성
이윤수,송갑득,이상문,심창현,최낙진,주병수,이덕동,허증수,Lee, Y.S.,Song, K.D.,Lee, S.M.,Shim, C.H.,Choi, N.J.,Joo, B.S.,Lee, D.D.,Huh, J.S. 한국센서학회 2002 센서학회지 Vol.11 No.2
저비용과 휴대성을 고려한 알코올 경보기의 제작을 위해 동작온도가 낮고 감도가 높은 반도체 가스 센서를 제작하였다. $Fe_2O_3$에 금속 산화물인 $MoO_3$, $V_2O_5$, $TiO_2$, 그리고 CdO 등을 첨가하여 스크린 프린팅법을 이용하여 센서를 제작하였다. 센서의 전기적 안정성을 위하여 질소 분위기에서 $700^{\circ}C$, 2시간 동안 열처리를 하였다. 알코올, 탄화수소계 가스와 담배연기 등을 사용하여 센서의 가스 감도를 조사하였다. $V_2O_5$를 첨가한 센서가 알코올 가스 1,000 ppm에 대해서 약 $80{\sim}90%$의 감도를 보이며, 타 가스에 대한 선택성도 가짐을 알 수 있었다. 제작된 센서와 PIC-chip을 사용하여 휴대 가능한 경보기를 제작할 수 있었다. In order to get low cost and portability, semiconductor gas sensor need to have low operating temperature and high sensitivity. $Fe_2O_3$ based sensors which were doped with metal oxide catalysts($MoO_3$, $V_2O_5$, $TiO_2$, and CdO) were fabricated by screen printing method. To improve electrical stability of sensors, the $Fe_2O_3$ sensors were annealed in $N_2$ at $700^{\circ}C$ for 2 hours. The $V_2O_5$ doped $Fe_2O_3$ sensor showed about $80{\sim}90%$ sensitivity at alcohol 1,000 ppm and have good selectivity to hydrocarbon gas and tobacco odors. The fabricated sensor and PIC-chip were employed for portable alarm system.
휘발성 유기 화합물 가스 측정을 위한 전도성 고분자 센서의 제조 및 감응 특성
백지흠,황하룡,노진규,허증수,허덕동,임정옥,변형기 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.
Fe_2O_3 후막을 이용한 alcohol sensor 제작 및 감응특성
이윤수,송갑득,이상문,심창현,최낙진,주병수,이덕동,허증수 한국센서학회 2002 센서학회지 Vol.11 No.2
저비용과 휴대성을 고려한 알코올 경보기의 제작을 위해 동작온도가 낮고 감도가 높은 반도체 가스 센서를 제작하였다. Fe_2O_3에 금속 산화물인 MoO_3, V_2O_5, TiO_2, 그리고 CdO 등을 첨가하여 스크린 프린팅법을 이용하여 센서를 제작하였다. 센서의 전기적 안정성을 위하여 질소 분위기에서 700 ℃, 2시간 동안 열처리를 하였다. 알코올, 탄화수소계 가스와 담배연기 등을 사용하여 센서의 가스 감도를 조사하였다. V_2O_5를 첨가한 센서가 알코올 가스 1,000 ppm에 대해서 약 80 ~ 90%의 감도를 보이며, 타 가스에 대한 선택성도 가짐을 알 수 있었다. 제작된 센서와 PIC-chip을 사용하여 휴대 가능한 경보기를 제작할 수 있었다. In order to get low cost and portability, semiconductor gas sensor need to have low operating temperature and high sensitivity. Fe_2O_3 based sensors which were doped with metal oxidecatalysts(MoO_3, V_2O_5, TiO_2, and CdO) were fabricated by screen printing method. To improve electrical stability of sensors, the Fe_2O_3 sensors were annealed in N_2 at 700 ℃ for 2 hours. The V_2O_5 doped Fe_2O_3 sensor showed about 80 ~ 90 % sensitivity at alcohol 1,000 ppm and have good selectivity to hydrocarbon gas and tobacco odors. The fabricated sensor and PIC-chip were employed for portable alarm system.