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Sol - Gel 법에 의한 Li 이온 - 고체 전해질의 CO2 가스 감지 특성
서무교,송갑득,곽종식,이덕동 ( Moo Gyo Seo,Kap Duk Song,jong Sik Kwak,Duk Dong Lee ) 한국센서학회 1995 센서학회지 Vol.4 No.3
Lithium ionic aolid electrclye was synthesized m in ambiencely sol-ge methxl. using tetraethyl orthosilcate, lithium metluwide, zirccmium n-prntxwide. utd trilntlle phosphate as precursors. he prepared material ryas dried and rmshed into ponder, nncl it w ns pressed into disk yux samples. $quot;These samples wcc sintemd at 0-C -11(X) fc () hours. The ply-sical characteristics of the samples acre imestigatecl ly TG D$quot; and lil) methods. CO senscn lrised on lithium ionic acdid elechwlye was fuhricated and its opxerationol characteristics were ntcsutrd. The sensing characteristics of the sensco sintered at 1(K) l show s the variation of e.m.f. OonU a.i Ei m\ decade fc the variaticm CO concentraticm at 0(l -ON) C efcerating temtxature. and goc linearit for 300-(i000 ppm.
판각형 열교환기내의 R-22 증발열전달 특성에 관한 실험적 연구
서무교(Moo-Gyo Seo),박재홍(Jae-Hong Park),김영수(Young-Soo Kim) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.9
The evaporation heat transfer coefficient for refrigerant R-22 flowing in the plate and shell heat exchanger were investigated experimentally in this study. Two vertical counterflow channels were forme in the exchanger by three plates of commercial geometry with a corrugated trapezoid shape of a chevron angel of 45˚. Upflow boiling of refrigerant R-22 in one channel receives heat from the hot down flow of water in the other channel. The effects of the mean vapor quality, mass flux, heat flux and pressure of R-22 on the evaporation heat transfer were explored. The quality change of R-22 between the inlet and outlet of the refrigerant channel ranges from 0.03 to 0.05. The present data showed that both the evaporation heat transfer coefficient increase with the vapor quality. At a higher mass flux, the evaporation heat transfer coefficient are higher for the entire range of the vapor quality. Raising the imposed wall heat flux was found to slightly improve the heat transfer, while at a higher refrigerant pressure, the heat transfer are slightly lower.
CaO를 첨가한 Na고체전해질 센서의 CO<sub>2</sub>가스 감도향상에 관한 연구
곽종식,서무교,최순돈,이덕동,Kwak, Jong-Sig,Seo, Moo-Gyo,Choi, Soon-Don,Lee, Duk-Dong 한국센서학회 2002 센서학회지 Vol.11 No.4
$CO_2$ 가스 감도를 높임과 동시에 감지거동을 안정화시키기 위하여 여러 함량의 CaO가 함유된 NASICON 전해질을 낮은 온도에서 소결하여 NASICON 센서를 제작하였다. 제조된 소자는 비교적 낮은 동작온도인 $250^{\circ}C$정도에서도 양호한 감도와 안정된 출력특성을 나타내었다. NASICON sensors that the NASICON electrolytes with various CaO amounts were sintered at low temperature($900^{\circ}C$), were fabricated to improve $CO_2$ sensitivity and stability in sensing behaviors. The manufactured device was shown good sensing characteristics and stability of output electromotive force at $250^{\circ}C$, comparatively low operating temperature.
알카리 금속 탄산염과 결착제의 혼합물을 감지물질로 하는 고체전해질 가스센서의 CO2 감응 특성
채유석,송갑득,강봉휘,서무교,이덕동 ( Yu Sug Chai,Kap Duk Song,Bong Hwi Kang,Moo Gyo Seo,Duk Dong Lee ) 한국센서학회 1998 센서학회지 Vol.7 No.2
The simple solid electrolyte carbon dioxide sensor with heaters were fabricated by using Li ionic conductor. Two Au electrodes were used for the reference and sensing electrode respectively. Two types of gas sensors, type ( I ) and type ( II ), were fabricated. Type ( I ) sensor was fabricated by the method of melting and crystallizing alkali metal carbonate at the temperature of 420 ∼ 500 ℃. The sensing membrane of type ( II ) sensor was formed by the printing method on sensing electrode after metal carbonate was mixed with binder. The response characteristics of sensors fabricated for the carbon dioxide were investigated for a range of CO₂ concentration from 950 ppm to 9,950 ppm at operating temperature 420 ℃. Type ( I ) sensor and type ( II ) sensor showed the sensitivity of 62 mV/decade and 65 mV/decade respectively. The emf/decade of type ( II ) sensor tested at 420 ℃ almost followed the theoretical value of Nernst`s equation and showed stable response characteristics with the fast response time of 15 ∼ 20 sec. Also type ( II ) sensor showed excellent stability and reproduction properties for 60 days.
CaO 를 첨가한 Na 고체전해질 센서의 CO2 가스 감도향상에 관한 연구
곽종식(Jong Sig Kwak),서무교(Moo Gyo Seo),최순돈(Soon Don Choi),이덕동(Duk Dong Lee) 한국센서학회 2002 센서학회지 Vol.11 No.4
NASICON sensors that the NASICON electrolytes with various CaO amounts were sintered at low temperatur(900℃), were fabricated to improve CO_2 sensitivity and stability in sensing behaviors. The manufactured device was shown good sensing characteristics and stability of output electromotive force at 250℃, comparatively low operating temperature.
MEMS 및 센서 시스템 : 단일전극을 가진 마이크로 가스센서의 제작 및 특성
송갑득 ( Kap Duk Song ),박영일 ( Yeung Il Bang ),이상문 ( Sang Mun Lee ),이윤수 ( Yun Su Lee ),최낙진 ( Nak Jin Choi ),주병수 ( Byung Su Joo ),서무교 ( Moo Gyo Seo ),허증수 ( Jeung Soo Huh ),이덕동 ( Duk Dong Lee ) 한국센서학회 2002 센서학회지 Vol.11 No.6
Micro gas sensor with single electrode was proposed for improving stability and sensitivity, Generally, metal oxide gas sensors have two electrodes for heating and sensing. This fabricated new type sensor have only a single electrode by forming a sensing material onto heating electrode. Pt as a heating and sensing electrode was sputtered on glass and a SnO_2 sensing material was thermally evaporated on Pt electrode. SnO_2 was patterned by lift-off process and then thermally oxidized in O_2 condition for 1 hr., 600 ℃. The size fabricated sensor was 1.9 x 2.1 mm^2. As a result of CO gas sensing characteristics, this sensor showed 100 mV change for 1,000 ppm and linearlity for wide range(0 ~ 10,000 ppm) of gas concentrations. And the sensor shows a good recovery characteristics of 1 % deviation compared to initial resistance.
pH-meter 개발을 위한 ISFET와 기준전극의 제작 및 그 동작특성
서무교,강명성,박응수,손병기 경북대학교 센서기술연구소 1990 센서技術學術大會論文集 Vol.1 No.1
Ag/AgCI reference electrode, by annodic plating, with KCl or NaCl solution as inner solution and ISFET (Ion Sensitive Field Effect Transistor) are fabricated and measured their operational characteristics in order to develope pH-meter using ISFET. The fabricated ISFET and reference electrode have a good pH sensitivity, 53mV/pH, and the sensitiveity showed an excellent linearity in the range of pH 2 to pH 12. The temperature dependence of pH-meter using ISFET is measured In the range of 0°C to 70°C, and it' s result is used for temperature compensation sequence in the pH-meter signal processing system. We certify that ISFET device can used for pH measurement system that need to fast measure continously varing pH values.