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Te@Se Core-Shell Heterostructures with Tunable Shell Thickness for Ultra-Stable NO2 Detection.

Xiao Cheng1, Yongtao Yao2, Shengliang Zheng1

  • 1School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, P. R. China.

ACS Sensors
|January 15, 2025
PubMed
Summary

Researchers developed novel 2D Tellurium@Selenium (Te@Se) heterostructures for highly sensitive and stable nitrogen dioxide (NO2) detection. These materials offer a promising solution for environmental monitoring and public health protection.

Keywords:
Te@Se heterostructurecore−shellhigh sensitivityroom-temperature NO2 sensingultrastable

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Area of Science:

  • Materials Science
  • Environmental Science
  • Chemical Engineering

Background:

  • Effective long-term monitoring of trace nitrogen dioxide (NO2) is crucial for ecological and public health.
  • Two-dimensional (2D) Tellurium (Te) shows potential for NO2 detection due to its electronic properties but suffers from poor stability.
  • Instability limits the practical application of Te as a gas-sensing material in various conditions.

Purpose of the Study:

  • To engineer stable and highly sensitive 2D gas-sensing materials for NO2 detection.
  • To overcome the stability limitations of pure 2D Tellurium.
  • To explore the potential of core-shell heterostructures for enhanced gas sensing performance.

Main Methods:

  • Synthesis of 2D single-elemental Te@Se heterostructures using a solvothermal method.
  • Characterization of the core-shell structure and its properties.
  • Evaluation of NO2 sensing performance, including response, recovery times, and long-term stability.

Main Results:

  • The Te@Se heterostructures exhibited an exceptionally high response (622%) to 1 ppm NO2 at room temperature.
  • Achieved ultrafast response (10 s) and recovery (30 s) times for NO2 detection.
  • Demonstrated excellent stability in sensing performance over 90 days, attributed to the ultrathin Se shell (4-6 nm).

Conclusions:

  • 2D Te@Se core-shell heterostructures offer a viable strategy for high-performance NO2 gas sensing.
  • The Se shell effectively enhances the stability and performance of Te-based gas sensors.
  • These findings open new avenues for developing advanced single-element core-shell heterojunctions for gas detection applications.