Electrodeposition of AuNi Alloy Nanoparticles on Mercapto Ionic Liquid–Graphite Composite Film and the Amperometric Determination of Hydroquinone

Mercapto-imidazolium ionic liquid (il, i.e. 1-methyl-3(2’-mercaptoacetoxyethyl)imidazolium hexafluophosphate)–graphite composite film is prepared. auni nanoparticlesare electrodeposited on it from aqueous electrolyte. the resulting composite film coatedglassy carbon electrode (auni–il–graphite/gce) is characterized by scanning electronmicroscopy, energy dispersive x–ray spectroscopy, x–ray diffraction and electrochemicalimpedance spectroscopy. the electrochemical redox of hydroquinone on the composite filmis investigated. the results show that the auni–il–graphite has high catalysis and stability.in neutral solutions, it can yield sensitive and stable amperometric response to hydroquinone.at 0.05 v (vs. sce) the response current is linear to hydroquinone concentration in the rangeof 0.5–40 ?m, with a detection limit of 0.05 ?m (s/n=3) and sensitivity of 0.92 ?ma cm-2?m-1.