Engineered spinel-perovskite composite sensor for selective carbon monoxide gas sensing

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• 作者：A. MaityAuthor Vitae ; A. GhoshAuthor Vitae ; S.B. Majumder ; ^{subhasish@matsc.iitkgp.ernet.in" class="auth_mail" title="E-mail the corresponding author}Author Vitae
• 关键词：Chemiresistive gas sensor ; Selective CO sensor ; Spinel&ndash ; perovskite nano-composite
• 刊名：Sensors & Actuators: B. Chemical
• 出版年：2016
• 出版时间：31 March 2016
• 年：2016
• 卷：225
• 期：Complete
• 页码：128-140
• 全文大小：4821 K

文摘

In the present work, a novel strategy has been adopted to develop highly sensitive and selective carbon monoxide (CO) gas sensor using (x)NiFe₂O₄ (spinel)–(1 − x)La_0.8Pb_0.2Fe_0.8Co_0.2O₃ (perovskite) (0 ≤ x ≤ 1) composite nano-powders. These powders were prepared through a citric acid mediated wet chemical pechini route. We have investigated the effect of the inclusion of perovskite phase in the spinel matrix to achieve high sensitivity, selectivity, lowering of the optimum temperature, rapid response and recovery time toward CO sensing. Improvement of these gas sensing parameters are essential to yield smart CO sensing system. We have demonstrated that optimized 25%NiFe₂O₄–75%La_0.8Pb_0.2Fe_0.8Co_0.2O₃ composite exhibits excellent sensitivity and selectivity toward CO sensing in operating temperatures ranging between 125 and 175 °C. The plausible reasons for the improvement in gas sensing parameters are discussed.