Pd–Ag alloy nanoparticle chains were fabricated on carbon fibers and hydrogen sensing performance was studied in present work. The mechanism for sensing hydrogen gas was discussed. A scanning electron microscopy equipped with energy dispersed X-ray spectrometer was used to characterize
the morphology and composition of the alloy nanoparticle chains. The results showed that the developed sensors responded to hydrogen gas from 0.2 to 10.0% at room temperature and had the advantages of fast response and high sensitivity. There were two linear relation scopes between the hydrogen
concentration ranges of 0.2–2.0% and 2.0–4.0%. The current response kept to constant over 4.0%. The sensors showed good reversibility and stability. Pd–Ag alloy nanoparticle chains on carbon fibers will become a promising sensitive material for hydrogen detection at room
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