MOF-Derived Mesoporous and Hierarchical Hollow-Structured In 2 O 3 -NiO Composites for Enhanced Triethylamine Sensing

作者：Qi Yuan Yu, Rongrong Jin, Liupeng Zhao, Tianshuang Wang, Fangmeng Liu, Xu Yan, Chenguang Wang, Peng Sun, Geyu Lu · 发表于：ACS Sensors · 年份：2021 · DOI：10.1021/acssensors.1c01374 · 被引用次数：174 · 研究领域：Gas Sensing Nanomaterials and Sensors、Advanced Chemical Sensor Technologies、Analytical Chemistry and Sensors

It remains a challenge to design and fabricate high-performance gas sensors using metal–organic framework (MOF)-derived metal oxide semiconductors (MOS) as sensing materials due to the structural damage during the annealing process. In this study, the mesoporous In 2 O 3 -NiO hollow spheres consisting of nanosheets were prepared via a solvothermal reaction and subsequent cation exchange. More importantly, the transformation of Ni-MOF into In/Ni-MOF through exchanging the Ni 2+ ion with In 3+ ion can prevent the destruction of the porous reticular skeleton and hierarchical structure of Ni-MOF during calcination. Thus, the mesoporous In 2 O 3 -NiO hollow composites possess high porosity and large specific surface area (55.5 m 2 g –1 ), which can produce sufficient permeability pathways for volatile organic compound (VOCs) molecules, maximize the active sites, and enhance the capacity of VOC capture. The mesoporous In 2 O 3 -NiO-based sensors exhibit enhanced triethylamine (TEA) sensing performance ( S = 33.9–100 ppm) with distinct selectivity, good long-term stability, and lower detection limit (500 ppb) at 200 °C. These results can be attributed to the mesoporous hollow hierarchical structure and p–n junction of In 2 O 3 -NiO. The preparation concept mentioned in this work may provide a versatile platform applicable to various mesoporous composite sensing material-based hollow structures.