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

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 HAuCl4 and nitrate salts of Ni2+ and Al3+. 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.