Synergistic Enhancement Effect of Palladium-Silver Alloy Nanoparticle Catalysts Towards High-Sensitive Hydrogen Detection

For high performance H
₂
sensing, PdAg alloy nanoparticle (NP) catalyst with synergistic effect is utilized to enhance the sensitivity of ZnO-based sensors. Compared with single Pd or Ag NPs, PdAg NPs show much higher catalytic activity to H
₂
. To form a PdAg enhanced ZnO chemiresistive sensor, ZnO nanowires array is firstly grown onto an integrated MEMS chip and then, PdAg NPs are homogeneously self-assembled onto the surface of ZnO nanowires via an ultrasonic method. Our sensor exhibits highly sensitive to ppm-level H
₂
.