Transparent Pd Wire Network-Based Areal Hydrogen Sensor with Inherent Joule Heater

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Sensing

Background:

• Transparent electronics are crucial for futuristic devices.
• Developing transparent active materials and electrodes is a key challenge.
• Hydrogen (H2) sensing requires sensitive and reliable detection methods.

Purpose of the Study:

• To fabricate a multifunctional transparent palladium (Pd) wire network.
• To utilize this network as a transparent electrode, H2 sensing material, and electrothermal heater.
• To evaluate the performance of the device for H2 detection.

Main Methods:

• Fabrication of a transparent Pd wire network using crackle lithography.
• Characterization of the network's sheet resistance and transmittance.
• Testing the H2 sensing capabilities across various concentrations.
• Implementing in situ Joule heating for performance enhancement.

Main Results:

• Achieved a transparent Pd wire network with sheet resistance of ~200 Ohm/sq and ~80% transmittance.
• Demonstrated H2 sensing down to 0.02% concentration.
• Obtained a response time of ~41 s, improved to ~13 s with Joule heating (~75 °C).

Conclusions:

• The transparent Pd wire network is a versatile material for H2 sensing devices.
• In situ Joule heating significantly enhances sensor response time.
• The device shows potential for scalable, flexible, and transparent H2 detection systems.