In situ electrochemical generation of gold nanostructured screen-printed carbon electrodes. Application to the detection of lead underpotential deposition

摘要: Abstract In the present work, an electrochemical method for reproducible and stable generation of gold nanostructures on surface screen-printed carbon electrodes was developed. This technique is based application a constant current over appropriate time interval. Gold nanostructured were characterized using both SEM methods. The mean diameter dispersion nanoparticles that generated electrochemically depended concentration, deposition intensity. Smaller diameters better distribution obtained when shift potential to −0.70 V occurred during electrodeposition process. Moreover, underpotential (UPD) lead these surfaces studied, as their behavior array electrodes. best results, UPD combined with square wave stripping voltammetry, 78 ± 24 nm density 4.4 × 10 7  nanoparticles/mm 2 . These by applying intensity −100 μA 300 s concentration 0.5 mM. reproducibility limit detection electrodic 2.4% (in terms RSD) 0.8 ng/mL, respectively.