Issue 10, 2010

One-pot synthesis of triangular gold nanoplates allowing broad and fine tuning of edge length

Abstract

A photocatalytic approach was used to synthesize triangular nanoplates in aqueous solution. The synthesis is based on the reduction of a gold salt using a tin(IV) porphyrin as photocatalyst, cetyltrimethylammonium bromide (CTAB) as a stabilizing agent, and triethanolamine (TEA) as the final electron donor. The average edge length of the triangular nanoplates can be easily changed in the range 45–250 nm by varying the concentration of photocatalyst, and fine-tuning of the average edge length is achieved by varying the concentration of CTAB. Study of the mechanism of formation of the nanoplates by UV-vis and by transmission electron microscopy (TEM) shows that there is a first stage where formation of 5 nm seeds takes place, further growth is probably by fusion and by direct reduction of gold onto the preformed nanoparticles. The nanoparticles formed during the photocatalytic reduction of the gold precursor show an irregular shape that evolves to regular triangular nanoplates after ripening in solution for 24 h.

Graphical abstract: One-pot synthesis of triangular gold nanoplates allowing broad and fine tuning of edge length

Supplementary files

Article information

Article type
Paper
Submitted
24 May 2010
Accepted
21 Jun 2010
First published
16 Aug 2010

Nanoscale, 2010,2, 2209-2216

One-pot synthesis of triangular gold nanoplates allowing broad and fine tuning of edge length

A. Miranda, E. Malheiro, E. Skiba, P. Quaresma, P. A. Carvalho, P. Eaton, B. de Castro, J. A. Shelnutt and E. Pereira, Nanoscale, 2010, 2, 2209 DOI: 10.1039/C0NR00337A

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