Investigation of 1D Siliver Nanoparticle Arrays for Use as Molecule Concentration-Specific SERS Substrates

Figure 4

The representative surface enhanced Raman spectra of BPE molecules absorbed on silver nanoparticle arrays, with different concentrations. From upper line to bottom line, the corresponding BPE molecular surface packing densities are 2×10⁻¹¹ mol/mm², 7×10⁻¹² mol/mm², 2×10⁻¹² mol/mm², 8×10⁻¹³ mol/mm², 3×10⁻¹³ mol/mm², 2×10⁻¹³ mol/mm², 1×10⁻¹³ mol/mm², 5×10⁻¹⁴ mol/mm², and 1×10⁻¹⁴ mol/mm². All spectra were recorded under identical experimental conditions and were vertically shifted for clarity.