Seed-Mediated Synthesis of Pd Nanocrystals: Factors Influencing a Kinetic- or Thermodynamic-Controlled Growth Regime

摘要: Palladium nanoparticles with defined morphologies were synthesized using a seed-mediated approach in the presence of cetyltrimethylammonium bromide (CTAB). This seeding technique, already applied to Ag and Au nanostructures, was successfully extended here Pd, noble metal important applications catalysis. Various types obtained going from 0-D nanocrystals (cubes, icosahedral multiply twinned particles) 1-D (nanorods) 2-D (triangular nanosheets). nanorods relatively high yield present well-defined 5-fold symmetry similar that reported previously for Au. Embedding PdCl42- precursor inside CTAB micelles found be key parameter decrease rate reduction palladium allow better kinetic-controlled growth regime, favoring formation nanorods. Shifting experimental conditions thermodynamic-controlled regime also selectively led cubic (∼80%) or i...