A mesopore-stimulated electromagnetic near-field: electrochemical synthesis of mesoporous copper films by micelle self-assembly

摘要: Surface-enhanced Raman spectroscopy (SERS) is a powerful analytical method that uses localized surface plasmon resonances (LSPRs) to enhance the cross-section of adsorbed molecules. Nanostructured copper (Cu) has been investigated as SERS substrate in recent years because it also plasmon-supporting metal like gold (Au) and silver (Ag), but Cu orders magnitude more abundant Earth's crust. Although prone oxidation tends generate weaker LSPRs than Au or Ag, sheer affordability drives demand for applications where highest levels sensitivity are not necessary. In addition, simplifying fabrication methods substrates avoiding costly lithographical techniques problems be overcome. this report, we describe fabricate mesoporous films (MCuFs) using self-assembled block copolymer micelles pore-directing agents an electrochemical deposition method. The pores generated by relatively large (>20 nm), which enables strong electromagnetic field enhancements via LSPR. Different electrodeposition conditions such potentials, times, molecular weights were tested study MCuF formation their effect on pore size, porous structure, activity. We found samples created with small most robust response. Electromagnetic simulations indicate important generating fields presence interconnected grooves assists collection light into these pores. optimal enhancement factor (EF) limit detection (LoD) 3.8 × 105 10−6 M, respectively. results confirm MCuFs efficient practical due simple synthesis, high performance, low cost.