A novel detection technique of hydrazine hydrate: modality change of hydrogen bonding-induced rapid and ultrasensitive colorimetric assay.

Ultrasensitive visual detection of hydrazine hydrate using a Au nanoparticles-based colorimetric sensing system (ANCSS) is reported for the first time, which is based on the hydrogen bonding recognition and the modality change of hydrogen bonding from "linear" (simple hydrogen bond interactions) to "nonlinear" (a complicated hydrogen bond network) between as-modified Au nanoparticles (Au NPs).