Size-dependence of surface plasmon resonance and oxidation for Pd nanocubes synthesized via a seed etching process.
Pd nanocubes between 8 and 50 nm in size were synthesized at the same concentration of Na2PdCl4 precursor by controlling the number of seeds formed in the nucleation stage. Increasing the concentration of FeCl3, an oxidative etchant for Pd, reduced the number of seeds and led to formation of larger Pd nanocubes. The larger nanocubes exhibited surface plasmon resonance peaks in the visible region, the locations of which matched with the results of the discrete dipole approximation calculation. While the nanocubes of 25 and 50 nm in size oxidized in air to form Pd@PdO core-shell structures, the 8-nm nanocubes were stable in air for over 90 days.
Xiong
Yujie
Y
Department of Chemistry, University of Washington, Seattle, Washington 98195, USA.
Chen
Jingyi
J
Wiley
Benjamin
B
Xia
Younan
Y
Yin
Yadong
Y
Li
Zhi-Yuan
ZY
D003460:Crystallization / Q000379:methods*; D008422:Materials Testing; D008968:Molecular Conformation; D049329:Nanostructures / Q000032:analysis / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods*; D010084:Oxidation-Reduction; D010165:Palladium / Q000032:analysis / Q000737:chemistry*; D010316:Particle Size; D044367:Phase Transition; D020349:Surface Plasmon Resonance / Q000379:methods*
D010165:Palladium