title: 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.
authors: REQUIMTE/Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre 687, 4169-007 Porto, Portugal.
authors: Adelaide
authors: A
authors: Miranda
authors: Eliana
authors: E
authors: Malheiro
authors: Elżbieta
authors: E
authors: Skiba
authors: Pedro
authors: P
authors: Quaresma
authors: Patrícia A
authors: PA
authors: Carvalho
authors: Peter
authors: P
authors: Eaton
authors: Baltazar
authors: B
authors: de Castro
authors: John A
authors: JA
authors: Shelnutt
authors: Eulália
authors: E
authors: Pereira
mesh_terms: D016880:Anisotropy; D004553:Electric Conductivity; D004583:Electrons; D004983:Ethanolamines / Q000737:chemistry; D006046:Gold / Q000737:chemistry*; D007700:Kinetics; D008422:Materials Testing; D053768:Metal Nanoparticles / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission / Q000379:methods; D008956:Models, Chemical; D036103:Nanotechnology / Q000379:methods*; D013056:Spectrophotometry, Ultraviolet / Q000379:methods; D013997:Time Factors
chemical_list: D004983:Ethanolamines; D006046:Gold; C009546:triethanolamine