Facile and controlled electrochemical route to three-dimensional hierarchical dendritic gold nanostructures

摘要

In this work, a facile, feasible and controlled electrochemical route was developed to prepare well-defined three-dimensional (3D) gold hierarchical dendrites (Au HDs) on a glassy carbon electrode by one-step electrodeposition, using the applied potential of 0.0V for 600 s in the electrolyte containing 20 mM HAuCl_4, 150 mM cytosine and 0.5 M H_2SO_4. Cytosine played important roles in the synthesis of the Au HDs, while no seed, template or surfactant involved. The corresponding growth mechanism was discussed in some detail. The as-prepared Au nanocrystals were applied as Raman-active substrates for surface-enhanced Raman scattering (SERS) amplification detection of Pb~(2+) with high sensitivity.