Porous hollow microspheres of SmFeO₃ were prepared from a simple process involving a metal organic framework (MOF) compound as the templating precursor. With a diameter of about 2 μm, these hollow-centered microspheres are formed by nanoporous thin walls of SmFeO₃. Chemoresistive gas sensors based on these microspheres exhibits excellent sensing performance on NO₂ at 200 °C, including high sensitivity (response of 10.2 under 200 ppb) with detection limit as low as 50 ppb, high selectivity, and reasonably short time for response and recovery (369 s/478 s). The superior sensing response over other SmFeO₃-based NO₂ sensors can be ascribed to the electron-accepting reactions during NO₂ adsorption, which is facilitated by the special morphological features of the microsphere.

SmFeO ₃多孔中空微球是通过一种简单的方法制备的，该方法涉及金属有机骨架（MOF）化合物作为模板前体。这些空心微球的直径约为2μm，由SmFeO _3的纳米多孔薄壁形成。基于这些微球的化学阻性气体传感器在200°C的条件下对NO ₂表现出出色的感测性能，包括高灵敏度（200 ppb下的10.2响应），检测限低至50 ppb，高选择性以及相当短的响应和恢复时间（369 s / 478 s）。优于其他基于SmFeO ₃的NO ₂传感器的感应响应可归因于NO ₂期间的电子接受反应 微球的特殊形态特征促进了吸附。