Electrochemical Dealloying Preparation and Morphology Evolution of Nanoporous Au with Enhanced SERS Activity

Nanoporous Au (NPG) prepared by dealloying is one of the most used substrates for surface-enhanced Raman scattering (SERS). The morphology tailoring of the NPG to obtain both ultrafine pores and suitable Au/Ag ratio is of great importance for the acquiring of enhanced SERS performance. Compared with the chemical dealloying, the electrochemical dealloying can tailor the NPG to be more flexible by the additional adjustment of dealloying voltage and current. Thus, further understanding on the morphology evolution of NPG during the electrochemical dealloying to obtain enhanced SERS performance is of great importance. In the presented work, the morphology and composition evolution of the NPG film during the electrochemical dealloying was investigated. NPG films with a stable pore diameter of approximately 11 nm as well as diverse compositions were obtained by electrochemical dealloying an Au-Ag alloy film. The prepared NPG film exhibits an enhanced SERS activity with an enhancement factor (EF) of 7.3 x 10(6) and an excellent detection limit of 10(-9) M. This work provides insights into the morphology and composition evolution of the NPG during the electrochemical dealloying process to obtain enhanced SERS performance.

Automated summary

Nanoporous Au (NPG) prepared by electrochemical dealloying is important for surface-enhanced Raman scattering (SERS). In this study, the morphology and composition evolution of the NPG film during the electrochemical dealloying process were investigated. NPG films with stable pore diameter and diverse compositions were obtained, exhibiting enhanced SERS activity and excellent detection limit. This work provides insights into the morphology and composition evolution of NPG for enhanced SERS performance.