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Journal of the Korea Institute of Military Science and Technology 2004;7(2):81-87.
Classification of Chemical Warfare Agents Using Thick Film Gas Sensor Array
Jun-Hyuk Kwak, Nak-Jin Choi, Tae-Hyun Bahn, Yeon-Tae Lim, Jae-Chang Kim, Jeung-Soo Huh, Duk-Dong Lee
Kyungpook National University
후막 센서 어레이를 이용한 화학 작용제 분류
곽준혁, 최낙진, 반태현, 임연태, 김재창, 허증수, 이덕동
경북대학교
Abstract
Semiconductor thick film gas sensors based on tin oxide are fabricated and their gas response characteristics are examined for four simulant gases of chemical warfare agent (CWA)s. The sensing materials are prepared in three different sets. 1) The Pt or Pd $(1,;2,;3;wt.\%)$ as catalyst is impregnated in the base material of $SnO_2$ by impregnation method.2) $Al_2O_3;(0,;4,;12,;20;wt.\%),;In_2O_3;(1,;2,;3;wt.\%),;WO_3;(1,;2,;3;wt.\%),;TiO_2;(3,;5,;10;wt.\%)$ or $SiO_2;(3,;5,;10;wt.\%)$ is added to $SnO_2$ by physical ball milling process. 3) ZnO $(1,;2,;3,;4,;5;wt.\%)$ or $ZrO_2;(1,;3,;5;wt.\%)$ is added to $SnO_2$ by co-precipitation method. Surface morphology, particle size, and specific surface area of fabricated sensing films are performed by the SEM, XRD and BET respectively. Response characteristics are examined for simulant gases with temperature in the range 200 to $400^{circ}C$, with different gas concentrations. These sensors have high sensitivities more than $50\%$ at 500ppb concentration for test gases and also have shown good repetition tests. Four sensing materials are selected with good sensitivity and stability and are fabricated as a sensor array A sensor array Identities among the four simulant gases through the principal component analysis (PCA). High sensitivity is acquired by using the semiconductor thick film gas sensors and four CWA gases are classified by using a sensor array through PCA.
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