Abstract
Construction of suitable heterojunction oxide nanocomposites with affluent porosities and distinctive microstructures is a primary approach for acquiring high-performance sensing materials for specific gases. In this work, certain Co3O4–TiO2 porous heterojunction nanosheets derived from bimetal–organic frameworks (BMOFs) were constructed by calcining MIL-125 and ZIF-67 precursors with the goal of sensing ethanol. Sensing results showed that BMOF-derived Co3O4–TiO2 porous nanosheets exhibited much better ethanol-sensing performances than metal–organic framework (MOF)-derived TiO2 nanotablets. The molar ratio of Co3O4 to TiO2 was modulated to optimize the sensing performances of the Co3O4–TiO2 nanosheets. Under the conditions of 250 °C and 50 ppm ethanol, the heterojunction nanosheets with an optimal molar ratio of 12 mol % displayed the highest response value of 41.72, which was 20.76 times higher than the response of pure TiO2 nanotablets (2.01). Moreover, the selectivity coefficient (85.29%) of 12 mol % Co3O4–TiO2 nanosheets was about 3.06 times as large as that of pure TiO2 nanotablets (27.91%). The enhanced sensing performances toward ethanol were mainly due to the formed p–n heterojunctions and the porous nanosheet nanostructures with a high specific surface area.
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