Size-Dependence of Surface Plasmon Resonance and Oxidation for Pd Nanocubes Synthesized via a Seed Etching Process
Yujie XiongChinese Academy of SciencesJingyi ChenInstitute of PhysicsBenjamin J. WileyDepartments of Chemistry and Chemical Engineering, University of Washington, Seattle, Washington 98195, The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, and Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People's Republic of ChinaYounan XiaChinese Academy of SciencesYadong YinUniversity of WashingtonZhiyuan LiChinese Academy of Sciences
2005en
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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.
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