Breakthrough in Nanotechnology: TiO2/SnO2 Core-Shell Nanowires for Enhanced H2S Sensing

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Researchers at Fudan University in Shanghai, China, have developed a novel method to synthesize TiO2/SnO2 core-shell nanowires with precisely controlled SnO2 shell thickness. This innovative approach enables the creation of highly sensitive and selective gas sensors for detecting hydrogen sulfide (H2S) at low concentrations. The breakthrough, published in Ceramics International, demonstrates the potential of MEMS-based TiO2/SnO2 core-shell nanowires for industrial and environmental monitoring applications.

Key Takeaways:

  • The researchers successfully synthesized TiO2/SnO2 core-shell nanowires with precisely controlled SnO2 shell thickness via a facile hydrothermal method and atomic layer deposition (ALD) process.
  • The optimized SnO2 shell thickness resulted in a significant enhancement in H2S sensing performance, with a response (R-a/R-g) of 5.9 towards 5 ppm H2S at 300°C.
  • The sensor demonstrated low power consumption (~100 mW), great selectivity towards H2S, fast response/recovery times (25 s and 173 s, respectively), high sensitivity, excellent repeatability, and remarkable stability (over 10 months).
  • The research proposed a MEMS-based TiO2/SnO2 core-shell NWs gas sensor as a promising approach for industrial and environmental monitoring applications.
  • The study received funding from the International Science and Technology Cooperation Program of Shanghai Science and Technology Innovation Action Plan and the National Key R & D Program of China.

Statistics:

  • The optimized SnO2 shell thickness was found to be 20 nm.
  • The sensor exhibited a response (R-a/R-g) of 5.9 towards 5 ppm H2S at 300°C.
  • The saturation time of the sensor was 173 s.
  • The power consumption of the sensor was ~100 mW.
  • The sensor demonstrated great selectivity towards H2S, detecting it at concentrations as low as 200 ppb.

Sources:

  • Fabrication of Mems-based Tio2/sno2 Core-shell Nanowires Sensor for Enhanced H2s Sensing. Ceramics International, 2025;51(20):31703-31712.
  • Fudan University, Shanghai Institute of Intelligent Electronics & Systems, School of Microelectronics, State Key Lab Asic & Syst, Shanghai 200433, People's Republic of China.
  • National Key R & D Program of China.
  • International Science and Technology Cooperation Program of Shanghai Science and Technology Innovation Action Plan.
  • Shanghai Science and Technology Innovation Action Plan.
  • Elsevier Sci Ltd, 125 London Wall, London, England.