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

摘要

One-dimensional arrays of silver nanoparticles with a particle size of 10.5nm and interparticle spacing of 8.5nm were fabricated by depositing nanoparticles in gas phase on block copolymer self-assembled templates.The substrate showed a surface-enhanced Raman scattering (SERS) enhancement factor as high as 1 × 10~7 with good reproducibility and stability. The dependence of the average enhancement factor and the SERS intensity on the packing density of the analyte molecules were investigated. For a tiny amount of analytes in the range of 1 × 10~(-14) to 3 × 10~(-13) mol/mm~2, the SERS signal showed a linear dependence on the molecule packing density on a logarithmic scale, with a slope of about 1.25. The substrates are promising for quantitative detection of trace level molecules.