In this presentation we discuss our routes towards the post-synthetic processing of nanomaterials to reach specific properties, morphologies, and phase regimes that are not accessible by simple synthesis alone.  One such example is the fine tunable plasmon resonances that are possible using core/alloy and core/alloy shell nanoparticles.  Here, we take advantage of atomic interdiffusion at nanoparticle interfaces to tailor alloy shell composition and thickness.  The resulting architectures allow us unprecedented control of surface plasmon resonance. As a proof-of-principle system, we employed both miscible and non-miscible alloys. Nanostructure morphology was characterized by TEM and STEM, and composition analysis was performed via selective area EDX, and XPS.  We further modeled phase behavior, and alloy compositions by comparing the resulting morphologies and surface plasmon resonance signatures with results from discrete dipole approximation (DDA) and Finite Difference Time Domain (FDTD) methods.

Fine-tuning surface plasmon resonance using core/alloy and core/alloy/shell architectures

242nd National Meeting (2011)

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