Standing Ag nanoplate-built hollow microsphere arrays: Controllable structural parameters and strong SERS performances

摘要: A simple and flexible strategy is presented to fabricate the Ag nanoplate-built hollow microsphere arrays with centimetre-squared scale, based on electrodeposition onto Au-coated monolayer colloidal crystal template. The array consists of periodically arranged micro-sized spheres, which are built by vertically standing cross-linking nanoplates. nanoplates single in structure, several hundred nanometres planar dimension about 30 nm thickness. number density size silver can be controlled deposition conditions. formation mainly attributed electrodeposition-induced nanoplates' growth initial stage subsequent electrophoretic deposition-induced oriented connection nanoparticles, formed solution, under a low current density. Importantly, such sphere micro-/nano-structured have shown significant surface-enhanced Raman scattering (SERS) effect associated their geometry, exhibiting strong SERS performances high stability good homogeneity. enhanced factor higher than 108. minimum detectable concentration 4-aminothiophenol molecules lower 10−15 M. Further, could re-usable an argon plasma cleaning method. This study significance, not only deep understanding growth, but also device application effect.