Shape-Controlled Synthesis of Palladium Nanorods and Their Magnetic Properties

A simple method for the controlled growth of single crystalline palladium nanorods is presented. Through tuning the molar ratio of two surfactants, cetyltrimethylammonium bromide (CTAB) and poly(vinyl pyrrolidone) (PVP), single crystalline palladium nanorods with different aspect ratios can be synthesized in large quantities. The introduction of cosurfactant CTAB is critical to the growth of palladium nanorods. Its headgroup CTA(+) and counterion Br- anion act as stabilizing species and etchant, respectively. Compared with PVP-capped Pd nanoparticles, the Pd nanorods show a ferromagnetism behavior at 5 and 300 K, respectively.