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Metal-organic framework-derived trimetallic oxides with dual sensing functions for ethanol
Xin-Yu Huang1, Ya-Ru Kang2, Shu Yan1
1College of Electronics and Information, University-Industry Joint Center for Ocean Observation and Broadband Communication, Qingdao University, Qingdao 266071, P. R. China. wfxie@qdu.edu.cn.
Nanoscale
|April 20, 2023
Summary
Metal-organic framework-derived trimetallic FeCoNi oxides offer enhanced gas sensing. These materials demonstrate high response and selectivity for ethanol detection, paving the way for advanced sensor technology.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Engineering
Background:
- Metal-organic frameworks (MOFs) are recognized for their porous structures, making them promising precursors for advanced gas sensors.
- MOF-derived metal oxide semiconductors offer unique advantages in gas sensing due to their high surface area and tunable architectures.
- Challenges in MOF-derived materials include cost-effective synthesis, precise nanostructure control, and achieving superior sensing performance.
Purpose of the Study:
- To synthesize novel trimetallic FeCoNi oxide (FCN-MOS) materials derived from Fe-MIL-88B for gas sensing applications.
- To investigate the relationship between the nanostructure, composition, and gas-sensing properties of the FCN-MOS system.
- To explore the potential of FCN-MOS for selective and stable detection of volatile organic compounds like ethanol.
Main Methods:
- One-step hydrothermal synthesis of Fe-MIL-88B followed by calcination to produce mesoporous FCN-MOS.
- Characterization of the FCN-MOS system, identifying α-Fe2O3 (n-type), CoFe2O4, and NiFe2O4 (p-type) phases.
- Fabrication and testing of gas sensors based on FCN-MOS to evaluate response, selectivity, and stability towards ethanol.
Main Results:
- Successfully synthesized mesoporous trimetallic FeCoNi oxides (FCN-MOS) with controllable nanostructures.
- The FCN-MOS system exhibited a mixed n-type (α-Fe2O3) and p-type (CoFe2O4, NiFe2O4) semiconductor behavior.
- Gas sensors demonstrated a high response (71.9) and excellent selectivity towards 100 ppm ethanol at 250 °C.
- Sensors maintained long-term stability for up to 60 days and showed tunable p-n transition gas sensing behavior with varying Fe/Co/Ni ratios.
Conclusions:
- Fe-MIL-88B-derived FCN-MOS are effective materials for high-performance gas sensing.
- The tunable composition and mesoporous structure of FCN-MOS enable precise control over gas-sensing properties.
- These materials show significant potential for developing advanced ethanol sensors with enhanced selectivity and stability.
