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Abstract
A colorimetric detection of hydrazine using AuPd alloy nanoparticles (NPs) as catalyst is described, in which methylene blue (methylthioninium chloride) acts as a redox indicator. The sensing system with AuPd NPs shows a rapid response at room temperature, leading to a color change within a few minutes, which is not achievable with Au or Pd NPs. A linear change in absorbance versus hydrazine concentration ranging from 0.1 to 5.0 mM can be obtained with a detection limit of ~4 × 10−4 M. The catalytic activity of the AuPd NPs in the reaction can be attributed to the electronic inductive effect by Au on Pd in the alloy NPs.
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