Nanotech 2011

Large Area Self Assembly of Gold Nanoparticle Clusters with Tunable Plasmon Resonance

F.L. Yap, S. Krishnamoorthy
Institute of Materials Research & Engineering, SG

Keywords: self assembly, block copolymer, gold nanoparticles array, nanoclusters, plasmonic

Abstract:

The organization of nanoparticles into clusters with well defined sized has potential for application in solar cells, data storage and plasmonics. Here, we demonstrate the assembly of pre formed gold nanoparticles into uniform clusters with controllable number of particles in each cluster. This was obtained by self assembly of an amphiphilic diblock copolymer (polystyrene-block-polyvinylpyrindine), creating nanopatterns of positively charged domains, which guide the selective attachment of negatively charged gold nanoparticles. The number of gold nanoparticles in each cluster can be precisely controlled by varying the template profile. This is advantageous over the random adsorption of nanoparticles on an unpatterned oppositely charged polyelectrolyte surfaces as they result in a broad range of aggregate sizes, and co-existence of aggregates with isolated particles. In this work, the optical properties of the gold clusters show red-shifting of plasmon resonance peak by more than 150 nm, with tunability in peak position depending on the number of particles per clusters. The process demonstrated here for nanoparticle cluster organization is simple, economy and scalable to wafer level. This technique is applicable to assembly of a wide range of nanoparticles, e.g. ZnO, TiO2, CdS, whose organization can result in technologically relevant devices.
 

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