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The Effects of Additions of In & Sb on Resistivity & Sensitivity in Tin Oxide Gas Sensors
손영목,한상도,김종원,심규성,Son, Y.M.,Han, S.D.,Kim, J.W.,Sim, K.S. 한국센서학회 1992 센서학회지 Vol.29 No.3
3가와 5가 이온의 첨가가 전기전도도 및 감응도에 어떤 영향을 미치는가를 확인하기 위하여, In와 Sb를 Tin Oxide에 공침법으로 첨가하였다. Sb는 5가 이온으로 cassiterite 구조에 들어가서 열에너지에 의하여 이들 이온을 여기시켜 전도대로 밀어올리리라고 여겨진다. In 이온은 결정격자 속에 $In^{3+}$로 들어가서 원자가대로 부터 전자를 받게 되고 그러므로써 1가나 2가가 되리라 생각한다. 그러나, 이러한 현상들이 $SnO_{2}$에 존재하는 전위장벽을 2종의 이온첨가에 의하여 일어나는 resistivity에 끼치는 영향과 비교해 볼 때 감응도에는 어떤 영향을 보이는지 고찰하였다. To determine the effect of additions of trivalent and pentavalent ions on the electrical conductivity and sensing behaviour, indium and antimony were incorporated in tin oxide by the coprecipitation method. Antimony may be considered to enter the cassiterite structure as pentavalent ions, thermal energy could excite electrons from these ions into the conduction band. Similarly the indium ions would enter the lattice as $In^{3+}$ but could accept electrons from the valence band, thereby becoming monovalent or divalent. These phenomena, however, how the potential barrier existing $SnO_{2}$ by addition of two kinds of ions could influence on the sensing behaviour in comparison with their influence on the resistivity were observed.
In 과 Sb 의 첨가가 Tin Oxide 가스센서에서 Resistivity 와 Sensitivity 에 미치는 영향
손영목,한상도,김종원,심규성 ( Y . M . Son,S . D . Han,J . W . Kim,K . S . Sim ) 한국센서학회 1992 센서학회지 Vol.1 No.1
To determine the effect of additions of trivalent and pentavalent ions on the electrical conductivity and sensing behaviour, indium and antimony were incorporated in tin oxide by the coprecipitation method. Antimony may be considered to enter the cassiterite structure as pentavalent ions, thermal energy could excite electrons from these ions into the conduction band. Similarly the indium ions would enter the lattice as In^(3+) but could accept electrons from the valence band, thereby becoming monovalent or divalent. These phenomena, however, how the potential barrier existing SnO₂ by addition of two kinds of ions could influence on the sensing behaviour in comparison with their influence on the resistivity were observed.
이대식,한상도,명광식,이상호,손영목,이종도 ( D . S . Lee,S . D . Han,k . S . Myung,S . H . Lee,Y . M . Son,J . D . Lee ) 한국센서학회 1995 센서학회지 Vol.4 No.4
Catalytic combustion type gas sensor was fabricated by using γ-Al₂O₃, Pd catalyst and some binders for metane and propane detection. Using the gas sensor, digital gas meter was manufactured and tested for sensing performance. The fabricated sensor had power consumption of 700mW with applied voltage of do 2V and the output voltage of the sensor was about 700mV for propane of 1,000ppm and 500mV for methane of 1,000ppm. In 10 cycle injection of the gases of 2,400ppm. The digital meter showed good sensitivity, linearity. and reproductivity with precision of ±25ppm(±1%)
SnO2 과 Pt 를 첨가한 WO3 후막센서의 제조 및 NOx 감응 특성
이대식,한상도,박기배,심규성,이덕동,손영목 ( D . S . Lee,S . D . Han,K . B . Park,K . S . Sim,D . D . Lee,Y . M . Son ) 한국센서학회 1996 센서학회지 Vol.5 No.5
highly sensitive WO₃ doped with SnO₂ and Pt thick-film sensors for NOx gas were fabricated. The sensors had a maximum sensitivity at operating temperature of 250℃, but the optimum operation temperature, considering recovery desorption time, was at 330℃. These sensors improved sensitivity, response and recovery time, selectivity and stability, as compared to WO₃ sensors. The good linearity of sensitivity as a function of the gas concentration exhibited the possibility to be used for concentration meter.
김종원(J . W . Kim),심규성(K . S . Sim),손영목(Y . M . Son) 한국수소및신에너지학회 1990 한국수소 및 신에너지학회논문집 Vol.2 No.1
A search program which use only free energies of formation has been developed to find new thermochemical cycles as means of producing hydrogen and oxygen from water. The searching procedures are described and some closed thermochemical cycles from this program are presented here.
가연성 가스 검출용 Figaro형 Pd/Al₂O₃/SnO₂계 센서 제조와 그 감응특성
명광식,한상도,이상호,박기배,손영목 경북대학교 센서기술연구소 1995 센서技術學術大會論文集 Vol.6 No.1
Figaro type gas sensor was fabricated with sensing materials in which mixed with SnO_(2) , Al_(2)O_(3) binder and palladium catalyst and, developed electronic parts. The SnO_(2) powders obtained by sol-gel method had a mean particle size of 0.93 p m and specific surface area of 32.5 m^(2)/g. And the γ-Al_(2)O_(3)with surface area of 180 m^(2)/g and a solution of 1M. PdCl_(2) were used for the synthesis of the sensing material. Mullite tubes of 0.8mm diamrter, Au pad electrodes of 0.3mm clearance, Au-Pd alloy lead wire of 80μm dia, heating element coiled with Kanthal wire of 60 μm dia were developed to use the gas sensor. The sensitivity of the sensors was excellent for the detection of methane, propane and carbon monoxide at about 490℃, 440℃ and 140℃, respectively.