Title

Stability and phase transfer of catalytically active platinum nanoparticle suspensions

Document Type

Article - Abstract Only

Publication Date

5-22-2015

Keywords

Catalysis, colloidal stability, nanoparticle synthesis, phase transfer, polyvinylpyrrolidone

Abstract

In this work, we present a robust synthesis protocol for platinum nanoparticles that yields a monomodal dispersion of particles that are approximately 100 nm in diameter. We determine that these particles are actually agglomerates of much smaller particles, creating a “raspberry” morphology. We demonstrate that these agglomerates are stable at room temperature for at least 8 weeks by dynamic light scattering. Furthermore, we demonstrate consistent electrocatalytic activity for methanol oxidation. Finally, we quantitatively explore the relationship between dispersion solvent and particle agglomeration; specifically, particles are found to agglomerate abruptly as solvent polarity decreases.

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