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In-MIL-68 derived In2O3/Fe2O3 shuttle-like structures with n-n heterojunctions to improve ethanol sensing

Zhenyue Liu1, Zhenkai Zhang1, Chen Yue1

  • 1School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264000, China. yxtaj@163.com.

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|January 17, 2024
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Summary

This study introduces a novel In₂O₃/Fe₂O₃ composite derived from Metal-Organic Frameworks (MOFs) for highly sensitive ethanol gas sensing. The material demonstrates excellent performance, selectivity, and stability, making it promising for practical applications.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Nanotechnology

Background:

  • Metal-organic frameworks (MOFs) offer tunable structures and properties ideal for gas sensing applications.
  • Developing efficient and stable gas sensors is crucial for environmental monitoring and safety.

Purpose of the Study:

  • To synthesize and characterize a novel In₂O₃/Fe₂O₃ composite derived from MOFs for ethanol gas detection.
  • To evaluate the sensing performance, including response, recovery, selectivity, and stability, of the synthesized material.

Main Methods:

  • Solvothermal and impregnation methods were employed for the synthesis of the In₂O₃/Fe₂O₃ composite.
  • Material characterization was performed using Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), X-ray Diffraction (XRD), and X-ray Photoelectron Spectroscopy (XPS).
  • Gas sensing performance was tested at various temperatures with 100 ppm of ethanol gas.

Main Results:

  • The In₂O₃/Fe₂O₃ composite exhibited a high response of 67.5 to 100 ppm ethanol at an optimal working temperature of 200 °C.
  • The sensor demonstrated rapid response (9 s) and recovery (236 s) times, along with excellent selectivity, repeatability, and long-term stability.
  • Characterization confirmed the formation of n-n heterojunctions, increased oxygen vacancies, and the preservation of MOF structural characteristics.

Conclusions:

  • The In-MIL-68-derived In₂O₃/Fe₂O₃ composite shows significant potential as a highly effective material for ethanol gas sensing.
  • The enhanced sensing performance is attributed to the synergistic effects of heterojunctions, oxygen vacancies, and the unique MOF-derived structure.
  • This material represents a promising advancement in the field of chemical sensors.