Pt-Nanoparticle-Loaded Porous SnO<sub>2</sub> for Optimizing H<sub>2</sub>S-Sensing Performance at Room Temperature
Peijin Zou, Zhuangzhuang Ma, Zihuan Tang, Xiaotong Gao, Xiaoxiong Hou, Lichao Jia
Abstract
Achieving the real-time detection of hydrogen sulfide (H 2 S) based on metal oxide semiconductor (MOS) gas sensors is of great significance for rapid disease diagnosis. However, the high-power consumption and poor selectivity severely limit its practice application. In this study, a platinum nanoparticle (Pt NPs)-loaded porous metal–organic framework (MOF)-derived SnO 2 material was successfully synthesized to optimize the H 2 S-sensing performance at room temperature. The optimized Pt-loaded porous SnO 2 -based gas sensor exhibited remarkably high sensitivity (712–10 ppm), fast response (21 s), good selectivity, and extremely low detection limit for H 2 S (10 ppb) at room temperature. The in-depth analysis demonstrated that the porous structure of Sn-MOF can provide adequate active reaction sites for gas molecules. Moreover, the uniform distribution of surface-loaded Pt NPs can initiate electron and chemical sensitization effects, thereby improving the sensing performance. The successful application of Pt NPs provides a novel approach to improve the room-temperature (RT) sensing performance of metal-oxide-semiconductor-based gas sensors.