The timely and effective detection of CO and CH₄ is critical as the explosion and poisoning of them can bring serious potential risks to coal mining. In this study, combining metal oxide semiconductors with noble metals offers a promising route to achieve this target. Hierarchical porous Pd modified In₂O₃ nanoflowers were prepared via two-step hydrothermal method and exhibited dual detection of CO and CH₄ at different temperatures. The material has been characterized by a number of advanced techniques and the results indicate that Pd modified In₂O₃ are hierarchical porous nanoflowers structure consisting of pores of approximately 1.8 nm in size. The sensing properties results show that the Pd modified In₂O₃ based sensor exhibits temperature-dependent dual selectivity detection of CO at 280 °C and CH₄ at 340 °C. In addition, the Pd modified In₂O₃ sensor display higher sensing response of CO (5.824 for 100 ppm) and CH₄ (1.162 for 1000 ppm), fast response and recovery time, as well as good repeatability, which demonstrating the great potential for practical application. Such good gas-sensing performance are mainly attributed to the unique flower-like structure, the presence of porosity on the sample surface, and the catalytic effect of Pd.

CO和CH ₄的及时有效检测至关重要，因为它们的爆炸和中毒会给煤矿开采带来严重的潜在风险。在这项研究中，将金属氧化物半导体与贵金属相结合为实现这一目标提供了一条有希望的途径。通过两步水热法制备了分级多孔Pd修饰的In ₂ O ₃纳米花，并在不同温度下对CO和CH _{4进行双重检测。}该材料已通过多种先进技术进行了表征，结果表明 Pd 改性 In ₂ O ₃是分层的多孔纳米花结构，由大小约为 1.8 nm 的孔组成。传感特性结果表明，基于 Pd 改性的 In ₂ O ₃传感器在 280 °C 和340 °C下对 CO 和 CH ₄表现出与温度相关的双选择性检测。此外，Pd 改性 In ₂ O ₃传感器对 CO（100 ppm 为 5.824）和 CH _{4具有更高的传感响应}（1000 ppm 为 1.162）、快速的响应和恢复时间以及良好的重复性，显示出巨大的实际应用潜力。如此良好的气敏性能主要归功于独特的花状结构、样品表面存在孔隙以及Pd的催化作用。