A New Method to Prepare Ordered Silver Nanoparticle Arrays

Poly (styrene-b-butadiene-b-styrene) (SBS) triblock copolymer templates which present in-plane cylinder pattern have been prepared by solvent-induced order-disorder phase transition method. Then silver clusters have been deposited onto the SBS copolymer templates by low energy clusters beam deposition (LECBD) apparatus. The characterization of samples by AFM with tapping-mode has shown that silver nanoparticles form ordered linear arrays, the interparticle distance of the same linear array is comparable to the particle size. Optical absorption spectra reveal that the surface plasmon resonance (SPR) of silver nanoparticles linear arrays occurs at 500nm. It is mainly due to electrodynamic interactions between silver nanoclusters. The surface-enhanced Raman spectroscopy(SERS) spectrum shows the electric field enhancement that occurs in the vicinity of interacting silver nanopraticles. Hence the assembly of metal-copolymer nanostructure provides a promising route to achieve well ordered nanostructures.