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Specific Sn-O-Fe Active Sites from Atomically Sn-Doping Porous Fe2O3 for Ultrasensitive NO2 Detection.

Yihong Zhong1, Guotao Yuan2, Dequan Bao3

  • 1Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices Jiangsu Key Laboratory of Advanced Negative Carbon Technologies, Soochow University, Suzhou, 215123, People's Republic of China.

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Summary
This summary is machine-generated.

Atomically doping porous iron oxide (Fe2O3) with tin (Sn) creates unique Sn-O-Fe sites. These sites significantly enhance gas sensor sensitivity and selectivity for nitrogen dioxide (NO2) detection at low temperatures.

Keywords:
Atomically dopingGas sensorNO2 detectionSpecific Sn–O–Fe sitesSpecific adsorption

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Conventional gas sensors based on metal oxides often exhibit poor sensitivity and cross-sensitivity due to limited adsorption sites.
  • Developing advanced gas sensing materials with enhanced performance is crucial for environmental monitoring and safety applications.

Purpose of the Study:

  • To investigate the effect of atomic doping on the gas sensing properties of porous Fe2O3.
  • To create efficient adsorption sites for highly sensitive and selective nitrogen dioxide (NO2) detection.

Main Methods:

  • Atomically doping porous Fe2O3 with Sn atoms to form Sn-O-Fe sites.
  • Characterization using X-ray absorption spectroscopy and atomic-resolution scanning transmission electron microscopy.
  • Gas sensing performance evaluation for NO2 at 150 °C, including sensitivity, selectivity, and limit of detection.
  • Theoretical calculations to understand the adsorption mechanism.

Main Results:

  • Sn atoms successfully incorporated into the Fe2O3 lattice, forming unique Sn-O-Fe sites.
  • The Sn-O-Fe sites exhibited a superior sensitivity (Rg/Ra = 2646.6) to 1 ppm NO2 compared to Fe-O-Fe and Sn-O-Sn sites.
  • Achieved ultra-low limit of detection (10 ppb) and enhanced selectivity for NO2.
  • Theoretical calculations confirmed stronger NO2 adsorption on Sn-O-Fe sites, with reduced bandgap facilitating electron transfer.

Conclusions:

  • Atomic doping with Sn is an effective strategy to create tailored adsorption sites in metal oxides for gas sensing.
  • The developed Sn-doped Fe2O3 demonstrates high sensitivity, selectivity, and low detection limits for NO2 at a low operating temperature.
  • This approach offers a promising pathway for designing next-generation, high-performance gas sensors.