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

• Type: Article in International Scientific Journal
• Date: 2010

Authors

Adelaide Miranda (Author) Other; Eliana Malheiro (Author) Other; Elzbieta Skiba (Author) Other; Pedro Quaresma (Author) Other; Patricia A Carvalho (Author) Other; Peter Eaton (Author) Other; Baltazar de Castro (Author) FCUP; John A Shelnutt (Author) Other; Eulalia Pereira (Author) FCUP

Journal

Title: Nanoscale

Vol. 2 No. 10

Pages: 2209-2216

ISSN: 2040-3364

Publisher: Royal Society of Chemistry

Indexing

ISI Web of Knowledge - 73 Citations

Scopus - 72 Citations

Scientific classification

FOS: Engineering and technology > Materials engineering

CORDIS: Technological sciences > Technology > Nanotechonology ; Physical sciences > Chemistry > Physical chemistry > Photochemistry ; Physical sciences > Chemistry > Inorganic chemistry

Other information

Authenticus ID: P-003-C2C

DOI: 10.1039/c0nr00337a

Abstract (EN): 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8