Detecting low concentration of H₂S gas by BaTiO₃ nanoparticle-based sensors

详细信息    查看全文

• 作者：He-Ming HuangAuthor Vitae ; Hua-Yao LiAuthor Vitae ; Xiao-Xue WangAuthor Vitae ; Xin Guo ; ^{xguo@hust.edu.cn" class="auth_mail" title="E-mail the corresponding author}Author Vitae
• 关键词：H2S sensors ; BaTiO3 ; Nanoparticle ; Low temperature
• 刊名：Sensors & Actuators: B. Chemical
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：238
• 期：Complete
• 页码：16-23
• 全文大小：3661 K

文摘

Ce-doped BaTiO₃ (Ba_0.99Ce_0.01TiO₃) nanoparticles with the sizes of 30–60 nm were prepared by the co-precipitation method, and sensors were fabricated by spin coating the nanoparticles on FTO substrates. To further enhance the sensing properties, α-Fe₂O₃ was decorated to the Ba_0.99Ce_0.01TiO₃ sensor. The Fe₂O₃-Ba_0.99Ce_0.01TiO₃ sensor showed fascinating gas sensing performances towards H₂S, including the ability to detect low concentrations of H₂S (400 ppb or lower), fast response and recovery speed (t_res = 45 s and t_rec = 124 s) and low working temperatures (150 °C). When exposed to H₂S, the sensor resistance increased, due to the reduction of Ce⁴⁺ to Ce³⁺ and the chemical reactions of oxygen species.