National Institute of Advanced Industrial Science and Technology (AIST), Advanced Manufacturing Research Institute, Moriyama-ku, Nagoya, Japan.
Sensors (Basel). 2013 Mar 8;13(3):3252-61. doi: 10.3390/s130303252.
Various types of CO sensors based on cerium oxide (ceria) have been reported recently. It has also been reported that the response speed of CO sensors fabricated from porous ceria thick films comprising nanoparticles is extremely high. However, the response value of such sensors is not suitably high. In this study, we investigated methods of improving the response values of CO sensors based on ceria and prepared gas sensors from core-shell ceria polymer hybrid nanoparticles. These hybrid nanoparticles have been reported to have a unique structure: The core consists of a cluster of ceria crystallites several nanometers in size. We compared the characteristics of the sensors based on thick films prepared from core-shell nanoparticles with those of sensors based on thick films prepared from conventionally used precipitated nanoparticles. The sensors prepared from the core-shell nanoparticles exhibited a resistance that was ten times greater than that of the sensors prepared from the precipitated nanoparticles. The response values of the gas sensors based on the core-shell nanoparticles also was higher than that of the sensors based on the precipitated nanoparticles. Finally, improvements in sensor response were also noticed after the addition of Au nanoparticles to the thick films used to fabricate the two types of sensors.
最近有报道称，基于氧化铈（ceria）的各种类型的 CO 传感器已经问世。也有报道称，由包含纳米颗粒的多孔氧化铈厚膜制成的 CO 传感器的响应速度极快。然而，这种传感器的响应值并不高。在这项研究中，我们研究了提高基于氧化铈的 CO 传感器响应值的方法，并制备了核壳氧化铈聚合物杂化纳米粒子的气体传感器。这些杂化纳米粒子具有独特的结构：核由几纳米大小的氧化铈微晶簇组成。我们比较了基于核壳纳米粒子制备的厚膜传感器与基于传统沉淀纳米粒子制备的厚膜传感器的特性。与基于沉淀纳米粒子制备的传感器相比，基于核壳纳米粒子制备的传感器的电阻大十倍。基于核壳纳米粒子的气体传感器的响应值也高于基于沉淀纳米粒子的传感器。最后，在两种类型的传感器所用的厚膜中加入金纳米粒子后，还注意到传感器响应的改善。
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