Palladium Nanoparticle-Based Surface Acoustic Wave Hydrogen Sensor

Palladium (Pd) nanoparticles (5–20 nm) are used as the sensing layer on surface acoustic wave (SAW) devices for detecting H₂. The interaction with hydrogen modifies the conductivity of the Pd nanoparticle film, producing measurable changes in acoustic wave propagation, which allows for the detection of this explosive gas. The nanoparticle-based SAW sensor responds rapidly and reversibly at room temperature