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Kinetically controlled synthesis of triangular and hexagonal nanoplates of palladium and their SPR/SERS properties.

Journal of the American Chemical Society (2005-12-01)
Yujie Xiong, Joseph M McLellan, Jingyi Chen, Yadong Yin, Zhi-Yuan Li, Younan Xia
ABSTRACT

The rapid reduction of Na(2)PdCl(4) by ethylene glycol in the presence of poly(vinyl pyrrolidone) (PVP) has recently been demonstrated as a convenient method of generating Pd cubooctahedra and twinned nanoparticles. Here we describe a new procedure where Pd triangular or hexagonal nanoplates could be selectively synthesized by manipulating the reduction kinetics of the polyol process. More specifically, the reduction rate was substantially reduced through the introduction of Fe(III) species and the O(2)/Cl(-) pair, two wet etchants for Pd(0). The etching power of the O(2)/Cl(-) pair could be further enhanced by adding an acid to lower the pH of the reaction solution. Unlike the previously reported synthesis of Ag and Au nanoplates, light was found to have no indispensable role in the formation of Pd nanoplates. Both triangular and hexagonal nanoplates of Pd exhibited surface plasmon resonance (SPR) peaks in the visible region, and their positions matched with the results of discrete dipole approximation (DDA) calculation. Thanks to their sharp corners and edges, these Pd nanoplates could serve as active substrates for surface-enhanced Raman scattering (SERS).

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Polyvinylpyrrolidone, average Mw ~1,300,000 by LS
Sigma-Aldrich
Polyvinylpyrrolidone, powder, average Mw ~55,000
Sigma-Aldrich
Polyvinylpyrrolidone, powder, average Mw ~29,000