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Chiral Plasmonic Hydrogen Sensors.

Marcus Matuschek1,2, Dhruv Pratap Singh1, Hyeon-Ho Jeong1

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Small (Weinheim an Der Bergstrasse, Germany)
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This study presents a novel chiral plasmonic sensor for hydrogen detection. Palladium nanohelices show sensitive and linear responses to hydrogen concentration, enabling safe, remote sensing.

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Area of Science:

  • Plasmonics
  • Nanotechnology
  • Materials Science

Background:

  • Chiral nanostructures offer unique optical properties.
  • Plasmonic sensors are crucial for gas detection.
  • Hydrogen sensing requires high sensitivity and safety.

Purpose of the Study:

  • To demonstrate a chiral plasmonic hydrogen-sensing platform.
  • To investigate the chiroptical response of palladium nanohelices to hydrogen.
  • To improve sensor linearity and reduce hysteresis.

Main Methods:

  • Fabrication of 3D chiral palladium-based nanohelices using nanoglancing angle deposition.
  • Experimental and theoretical characterization of circular dichroism.
  • Evaluation of sensor performance with varying hydrogen concentrations and palladium-gold compositions.

Main Results:

  • Palladium nanohelices exhibit strong circular dichroism.
  • Chiroptical properties change sensitively with hydrogen uptake and concentration.
  • Incorporation of gold into palladium-gold hybrid helices significantly improves linearity and reduces hysteresis.
  • The sensor demonstrates suitability for remote and spark-free hydrogen detection.

Conclusions:

  • Chiral plasmonic nanohelices provide a sensitive platform for hydrogen sensing.
  • The developed sensor offers improved linearity and reduced hysteresis, crucial for accurate monitoring.
  • This technology holds potential for advanced hydrogen-sensing applications requiring high performance and safety.