Hybrid Hydrogen Sensor Based on Pd/WO₃ Showing Simultaneous Chemiresistive and Gasochromic Response

Area of Science:

• Materials Science
• Chemical Sensors
• Nanotechnology

Background:

• Gasochromism in tungsten oxide (WO3) allows for visual hydrogen detection.
• Traditional sensors may lack simultaneous visual and electrical detection capabilities.

Purpose of the Study:

• To develop a hybrid hydrogen sensor utilizing both the gasochromic and resistive properties of WO3.
• To enhance hydrogen detection by combining visual and electrical signals.

Main Methods:

• Fabrication of a hybrid sensor with a transparent electrode on a glass substrate.
• Utilizing the gasochromic response (color change) and resistance change of WO3 upon hydrogen exposure.

Main Results:

• The hybrid sensor successfully demonstrated both visual color change and resistance variation in response to hydrogen.
• The transparent electrode design clearly illustrated the gasochromic effect and resistance changes.

Conclusions:

• The developed hybrid WO3 sensor effectively combines gasochromic and resistive sensing for hydrogen detection.
• This approach offers a robust and visually intuitive method for identifying hydrogen presence.