In this study, chemical de-alloying method was used to prepare nanoporous gold (NPG) from the Au containing amorphous alloy, with chemical composition of Au₂₀Cu₄₈Ag₇Pd₅Si₂₀. Gold nanostructures were electrodeposited on the nanoporous gold by adjusting the applied potentials and deposition times. Using Rhodamine 6G (R6G) as probe molecule, the surface enhanced Raman scattering (SERS) activity of various Au nanostructures on nanoporous gold were compared. The dendritic nanostructures electrodeposited for 3000 s on NPG exhibited strongest SERS effect and high reproducibility. Using this best SERS active substrate for melamine sensing, the detection limit of 10^-7 M was achieved.

本研究采用化学脱合金法从含金的非晶态合金中制备出具有化学成分为Au ₂₀ Cu ₄₈ Ag ₇ Pd ₅ Si _20的纳米多孔金（NPG）。通过调节施加的电势和沉积时间，将金纳米结构电沉积在纳米多孔金上。使用罗丹明6G（R6G）作为探针分子，比较了各种Au纳米结构在纳米多孔金上的表面增强拉曼散射（SERS）活性。在NPG上电沉积3000 s的树状纳米结构表现出最强的SERS效应和高重现性。使用此最佳的SERS活性底物进行三聚氰胺感测，检测极限达到10 ^-7M。