INOR 541 |
| We have tailored the size, shape, and structure (hollow vs. solid) of Pd nanostructures by controlling the reduction kinetics, and tuned their surface plasmon resonance (SPR) peaks from the UV to the visible region. The reduction kinetics can be controlled either by coupling the polyol reduction with oxidative etching, or through the manipulation of reductants. For oxidative etching, we have demonstrated its use for shape-controlled synthesis in three different ways: (i) to increase the size of Pd nanocubes from 8 and 50 nm by controlling the number of seeds formed in the nucleation stage via the oxidative etching by Fe(III) species; (ii) to grow triangular and hexagonal nanoplates through the control of kinetics by O2/Cl- pair and Fe(III) species; and (iii) to transform solid nanocubes of Pd into hollow nanocages via a corrosive pitting process in the presence of water and much poly(vinyl pyrrolidone) (PVP). On the other hand, we have used the hydroxyl end group of PVP as a new class of reductant whose mild reducing power is ideal for kinetically controlling the synthesis of Pd hexagonal and triangular nanoplates. |
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Nanoscience: Synthesis
9:00 AM-12:00 PM, Tuesday, 12 September 2006 Moscone Center -- Room 309, Oral
Division of Inorganic Chemistry |