One-pot synthesis of triangular gold nanoplates allowing broad and fine tuning of edge length (original) (raw)
* Corresponding authors
a REQUIMTE/Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 687, Porto, Portugal
E-mail: eulalia.pereira@fc.up.pt
Fax: +351 220 402 959
Tel: +351 220 402 588
b Departamento de Engenharia dos Materiais do Instituto Superior Técnico, Av. Rovisco Pais, Lisboa, Portugal
c Advanced Materials Laboratory, Sandia National Laboratories, 1001 University Blvd SE, Albuquerque, NM, USA
d Department of Chemistry, University of Georgia, Athens, GA, USA
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.
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Article information
DOI
https://doi.org/10.1039/C0NR00337A
Article type
Paper
Submitted
24 May 2010
Accepted
21 Jun 2010
First published
16 Aug 2010
Download Citation
Nanoscale, 2010,2, 2209-2216
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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, 2209DOI: 10.1039/C0NR00337A
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