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Synthesis of shaped Pt nanoparticles using common anions or small molecules as shape-directing agents: observation of a strong halide or pseudo-halide effect

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Abstract

Chemical reduction of Pt(II) and Pt(IV) salts by H2, hydrazine, or borohydride ion, in the presence of common anions or small molecules is surveyed to discover shape-directing agents suitable for selective formation of Pt metal nanocubes or nanotetrahedra. Surfactants tested include a variety of amino acids, HSCH2CO2H, Ph2PCH2CO2H, polycarboxylate species, such as glycolate or tartrate ion, and several common anions (including CF3SO3, ClO4, NO3, CO32−, PO43−, SO42−, Cl, Br, or I). Although carboxylate, chloride, bromide, carbonate, nitrate, perchlorate, phosphate, sulfate, or triflate ions show poor shape-directing influence, the presence of hydroxide and iodide ions gives an unexpected halide (or pseudo-halide) effect. Hydrogen reduction of [Pt(OH)6]2− ion at basic pH gives high yields of cubic Pt nanoparticles, while hydrogen reduction of [PtI6]2− ion at basic pH gives high yields of tetrahedral Pt nanoparticles.

Graphical abstract: Synthesis of shaped Pt nanoparticles using common anions or small molecules as shape-directing agents: observation of a strong halide or pseudo-halide effect

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Article information


Submitted
04 Nov 2014
Accepted
02 Dec 2014
First published
02 Dec 2014

This article is Open Access

J. Mater. Chem. A, 2015,3, 2012-2018
Article type
Paper
Author version available

Synthesis of shaped Pt nanoparticles using common anions or small molecules as shape-directing agents: observation of a strong halide or pseudo-halide effect

J. A. Michel, W. H. Morris III and C. M. Lukehart, J. Mater. Chem. A, 2015, 3, 2012
DOI: 10.1039/C4TA05952B

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