Work

Mixed-linker strategy for superior 1D MOF-derived p-n junction acetone sensors

Year: 2025

Type: article

Abstract: Controlling the morphology of metal–organic frameworks (MOFs) is critical for tailoring their transformation into metal oxides with unique microstructures and properties, particularly for gas sensing applications. In this study, a dual In-MOF-MF was developed using a mixed linker approach involving terephthalic acid and fumaric acid . These two linkers interact with In 3 + ions to produce nanofibers with a high aspect ratio. The resulting In 2 O 3 -MF exhibits superior acetone sensing properties compared to In 2 O 3 derived from single-linker MOFs. Furthermore, the n-type In 2 O 3 -MF was coupled with p-type PtO to create a p-n junction gas sensor. The combination of rich active sites and the well-defined coupling interfaces between PtO and In 2 O 3 -MF leads to remarkable acetone sensing performance, featuring a high response (347–100 ppm acetone), rapid response/recovery time (34/18 s), excellent selectivity, and a relatively low detection limit (300 ppb). This work highlights a mixed-linker strategy for MOF morphology manipulation, enabling the fabrication of a one-dimensional p-n junction for next-generation advanced acetone sensing applications.

Source: Sensors and Actuators B Chemical

DOI: 10.1016/j.snb.2025.137529