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Magnetic Field Modulates Butterfly-Hysteretic Formaldehyde Response in Sm-Doped BiFeO3 Sensors.
Ting Xie1, Huan Luo1, Chenglin An1
1College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, Sichuan 610068, China.
ACS Sensors
|February 2, 2026
Summary
This study shows that applying a magnetic field enhances formaldehyde gas sensor performance. Samarium-doped BiFeO3 sensors demonstrated improved detection limits and faster responses, utilizing magnetoelectric effects.
Area of Science:
- Materials Science
- Chemical Sensing
- Environmental Monitoring
Background:
- High-performance formaldehyde gas sensors are crucial for health and environmental monitoring.
- Conventional gas sensor enhancement relies on chemical modifications.
- Multiferroic materials offer a novel approach via magnetoelectric coupling.
Purpose of the Study:
- To investigate the use of magnetic fields to enhance formaldehyde gas sensor performance.
- To explore the magnetoelectric effect in samarium-doped BiFeO3 for gas sensing applications.
- To demonstrate a new strategy for improving sensor sensitivity and kinetics.
Main Methods:
- Fabrication of gas sensors using 5% samarium (Sm)-doped BiFeO3.
- Testing sensor response to formaldehyde under varying magnetic field strengths (e.g., 100 mT).
- Analysis of magnetic field-dependent response behavior, detection limits, and response kinetics.
Main Results:
- The Sm-doped BiFeO3 sensor exhibited a butterfly-hysteretic magnetic field-dependent response.
- Under a 100 mT magnetic field, the detection limit decreased from 90 to 50 ppb.
- Response kinetics accelerated by 207%, and gas response to 20 ppm formaldehyde increased by 161%.
Conclusions:
- Magnetic field application significantly enhances formaldehyde gas sensor performance.
- The observed improvements are attributed to magnetic field-induced surface polarization and domain wall motion via the magnetoelectric effect.
- This research expands the application of multiferroics and magnetoelectric materials in high-performance gas sensing.
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