One Step Fabrication of Au Nanoparticles‐Ni‐Al Layered Double Hydroxide Composite Film for the Determination of L‐Cysteine

Abstract This paper reports the fabrication of Au nanoparticles (Au NPs)‐Ni‐Al layerd double hydroxide (LDH) composite film by one step electrochemical deposition on the surface of a glass carbon electrode from the mixture solution containing HAuCl 4 and nitrate salts of Ni 2+ and Al 3+ . Improved conductivity was obtained by Au NPs codeposited on LDH film. The synergic effect of LDHs and Au NPs dramatically improves the performance of L ‐cysteine electro‐oxidation, displaying low oxidation peak potential (0.16 V) and high current response. Thus the electrode was used to sense L ‐cysteine, showing good sensitivity and selectivity.