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Issue 10, 2013
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Growth and galvanic replacement of silver nanocubes in organic media

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Abstract

Although metal nanoparticles with various shapes can be prepared in polar organic solvents, little has been advanced toward the shape-controlled synthesis in non-polar solvents. We report a simple method for the synthesis of nearly monodisperse single crystalline silver nanocubes in a non-polar solvent (1,2-dichlorobenzene) by using oleylamine as both a reducing and capping agent. Mechanistic studies based on the time evolution of Ag nanoparticles revealed that multiply twinned nanocrystals form at the beginning of the reaction, which are gradually transformed into single crystalline Ag nanocubes by oxidative etching. Control experiments showed that the solvent plays an important role in the formation of such single crystalline Ag nanocubes. The effects of reaction temperature, oleylamine concentration, solvent, and the nature of the silver ion precursor on the morphology and monodispersity of the nanoparticles were systematically investigated. Additionally, the galvanic replacement reaction with HAuCl4 in an organic medium was implemented to prepare hydrophobic hollow Au–Ag nanocages with tunable localized surface plasmon resonances.

Graphical abstract: Growth and galvanic replacement of silver nanocubes in organic media

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Publication details

The article was received on 11 Mar 2013, accepted on 17 Mar 2013 and first published on 21 Mar 2013


Article type: Paper
DOI: 10.1039/C3NR01244A
Citation: Nanoscale, 2013,5, 4355-4361
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    Growth and galvanic replacement of silver nanocubes in organic media

    L. Polavarapu and L. M. Liz-Marzán, Nanoscale, 2013, 5, 4355
    DOI: 10.1039/C3NR01244A

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