Nanoporous Co3O4-TiO2 Heterojunction Nanosheets for Ethanol Sensing

被引：28
作者：
Li, Gang [1 ]
Zhang, Yuanyi [1 ]
Liang, Qingfei [1 ]
Zhang, Jinniu [2 ]
Liu, Jia [1 ]
Liu, Yumeng [1 ]
Wang, Chunlan [3 ]
Gao, Jianzhi [1 ]
Lu, Hongbing [1 ]
机构：
[1] Shaanxi Normal Univ, Sch Phys & Informat Technol, Xian 710062, Peoples R China
[2] Xian Univ Posts & Telecommun, Sch Sci, Xian 710121, Peoples R China
[3] Xian Polytech Univ, Sch Sci, Xian 710048, Peoples R China
来源：
ACS APPLIED NANO MATERIALS | 2022年 / 5卷 / 04期
基金：
中国国家自然科学基金;
关键词：
Co3O4; TiO2; gas sensor; metal-organic frameworks; heterojunction; SENSOR; NANOSTRUCTURES; NANOPARTICLES; DESIGN;
D O I：
10.1021/acsanm.1c04259
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
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 ZIF67 precursors with the goal of sensing ethanol. Sensing results showed that BMOF-derived Co3O4-TiO2 porous nanosheets exhibited much better ethanolsensing 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 degrees 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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收藏
页码：4779 / 4786
页数：8
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