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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.
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.
신한재(Han-Jae Shin),송갑득(Kap-Duk Song),이덕동(Duk-Dong Lee) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7
Tellurium thin films were studied for its use as nitrogen dioxide gas operated at room temperature The resistance of the tellurium films decreases reversibly in the presence of NO₂. The interaction of nitrogen dioxide with tellurium film was investigated using SEM. The results showed that nitrogen dioxide reduces tellurium oxide resistances on the surface and grain boundary of the film to tellurium. The sensitivity of this device depends on the gas concentration and it increase to lower concentrations less than 5 ppm. The response time was considerably of 3~4 min.
이윤수 ( Yun Su Lee ),송갑득 ( Kap Duk Song ),주병수 ( Byung Su Joo ),이상문 ( Sang Mun Lee ),최낙진 ( Nak Jin Choi ),이덕동 ( Duk Dong Lee ),허증수 ( Jeung Soo Huh ) 한국센서학회 2004 센서학회지 Vol.13 No.2
N/A Optical fiber sensors have been used to detect small amounts of chemical species. In this work, a new thin polymer-clad fiber sensor is developed. Polyaniline is chemically synthesized and thin clad layers of the polymer are easily deposited on optical fiber by dip-coating technique. The optical property of polyaniline as a sensing material is analyzed by UV-Ms-NIR. The light source is stabilized He-Ne laser at635 nm wavelength with 1 mW power. The light power transmitted through the optical fiber is measured with a spectrophotometer. By selecting a fixed incident angle, variation of transmitted light intensity through the optical fiber can be detected as gas molecules absorbed in the polyaniline clad layer. Among the various gases, the fabricated optical fiber sensor shows good sensitivity to NH3 gas. The optical fiber sensors was shown more improved properties than polymer based sensors which measure conductivity changes.
송갑득,박영일,이상문,이윤수,최낙진,주병수,서무교,허증수,이덕동 한국센서학회 2002 센서학회지 Vol.11 No.6
센서의 안정도와 감도를 개선시킬 수 있는 단일전극을 가진 열선형 마이크로 가스센서를 제작하였다. 일반적으로, 금속산화물 반도체를 이용한 가스센서는 히터전극과 감지전극의 두 개의 전극을 가지고 있다. 제작된 센서는 히터전극위에 감지물질을 형성하여 단일 전극을 가지는 구조를 가지고 있다. 히터와 감지전극으로 사용되는 Pt는 glass 기판위에 스퍼터링법으로 형성하였으며, SnO_2 감지물질은 제작된 Pt 전극위에 열증착시켜 형성하였다. SnO_2막은 lift-off 공정을 이용해서 패턴을 형성하고 1시간 동안 산소분위기에서 열산화하였다. 제작된 소자의 크기는 1.92x.1 mm^2 이다. CO 가스에 대한 감지특성을 조사한 결과 1,000 ppm에 대해 100 mV의 출력변화를 나타내었으며, 넓은 농도범위(0 ~ 10,000 ppm에서 선형적인 전압출력을 나타내었다. 또한 가스 반응 전과 반응 후의 전압출력을 비교해 볼 때, 1 % 이내의 편차를 나타내는 우수한 회복성을 나타내었다. 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.
송갑득,서무교,곽종식,이덕동 경북대학교 센서기술연구소 1995 센서技術學術大會論文集 Vol.6 No.1
Carbon dioxide gas sensor, which has inner heater, is fabricated using Li ionic electrolyte as raw material which is systhesized by sol-gel method. It has either Au electrode or Pt electrode as the metal electrode of sensing electrode part. Sensing characteristics for carbon dioxide gas and interference effect for carbon monoxide gas and hydro carbon gases are investigated. The sensors using Au electrode and Pt electrode show sensitivity about 25 mV/decade and 26 mV/decade for the variation of carbon dioxide gas concentration, respectively. The sensor using Au electrode shows more exellent selectivity compared to that using Pt electrode for carbon monoxide gas and hydro carbon gases.