Abstract Rational structure design of sensing materials plays a crucial part in fabricating high performance gas sensors. In this work, three Co3O4 samples with different morphologies, including Co3O4-C (Cube-shaped Co3O4), Co3O4-R (Rod-shaped Co3O4) and Co3O4-S (Sheet-shaped Co3O4), were synthesized through a hydrothermal route. Hierarchical structures-dependent gas-sensing properties were further investigated. The toluene sensing performance of Co3O4-S hierarchical structure-based sensor outperforms the other two ones. It exhibited higher sensitivity, faster response-recovery speed and better selectivity to toluene at the working temperature of 180 °C. In addition, the Co3O4-S-based gas sensor can maintain its sensitivity to toluene after one month, suggesting it good reliability. Preliminary functional tests for the detection of toxic analytes indicated it can be considered as a promising candidate for applications in detecting toluene.

中文翻译：

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基于p型Co3O4作为甲苯检测传感器的分层结构的简易制备

摘要 传感材料的合理结构设计是制造高性能气体传感器的关键。在这项工作中，通过水热法合成了三种不同形态的 Co3O4 样品，包括 Co3O4-C（立方体状 Co3O4）、Co3O4-R（棒状 Co3O4）和 Co3O4-S（片状 Co3O4）。进一步研究了分层结构相关的气敏特性。Co3O4-S 分层结构传感器的甲苯传感性能优于其他两个传感器。在180℃的工作温度下表现出更高的灵敏度、更快的响应-恢复速度和更好的甲苯选择性。此外，基于 Co3O4-S 的气体传感器在 1 个月后仍能保持对甲苯的灵敏度，表明其具有良好的可靠性。