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Anchoring Sn-Containing High-Entropy Alloy PtFeCoNiCuSn on SnO2 for Improving Acetone Detection Ability.

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Area of Science:

  • Materials Science
  • Chemical Sensing
  • Nanotechnology

Background:

  • Accurate acetone (C3H6O) detection is vital for environmental monitoring and noninvasive diabetes diagnosis.
  • High-entropy alloys (HEAs) can enhance semiconductor metal oxide gas sensors but often suffer from high-temperature agglomeration, limiting stability.
  • Tin dioxide (SnO2) is a common semiconductor metal oxide used in gas sensors.

Purpose of the Study:

  • To develop a stable and highly sensitive acetone gas sensor using a functionalized HEA.
  • To investigate the role of tin (Sn) within a HEA in preventing agglomeration and enhancing catalytic activity.
  • To improve the long-term stability and performance of SnO2-based gas sensors.

Main Methods:

  • Fabrication of a PtFeCoNiCuSn high-entropy alloy (HEA) as a sensitizer for SnO2.
  • Characterization of the HEA-SnO2 composite material and its gas-sensing properties.
  • Evaluation of sensor performance, including sensitivity, response/recovery times, detection limit, and long-term stability at various temperatures.

Main Results:

  • The PtFeCoNiCuSn-SnO2 sensor demonstrated enhanced sensitivity and stability compared to Sn-free HEA counterparts.
  • Achieved a low detection limit of 4 ppb for acetone at a working temperature of 230 °C.
  • Exhibited excellent long-term stability over a 63-day continuous test with minimal response degradation (σ = 0.056).
  • Shorter response and recovery times (6.5 s/10.5 s) were recorded.

Conclusions:

  • The incorporation of Sn in the HEA structure effectively prevents agglomeration and enhances the interaction with SnO2.
  • Synergistic effects between the HEA's multielement composition and strong metal-support interaction boost sensor performance.
  • This study offers a promising strategy for developing robust and efficient HEA-semiconductor metal oxide gas sensors.