One-pot synthesis of triangular gold nanoplates allowing broad and fine tuning of edge length
| Autor: | Adelaide Miranda, Baltazar de Castro, Patricia Almeida Carvalho, Pedro Quaresma, Eliana Malheiro, John A. Shelnutt, Eulália Pereira, Peter Eaton, Elżbieta Skiba |
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| Rok vydání: | 2010 |
| Předmět: |
Time Factors
Inorganic chemistry One-pot synthesis Metal Nanoparticles chemistry.chemical_element Nanoparticle Electrons Electron donor chemistry.chemical_compound Microscopy Electron Transmission Materials Testing medicine Nanotechnology General Materials Science Aqueous solution Electric Conductivity Kinetics Models Chemical chemistry Ethanolamines Transmission electron microscopy Triethanolamine Photocatalysis Anisotropy Spectrophotometry Ultraviolet Gold Tin medicine.drug |
| Zdroj: | Nanoscale. 2:2209 |
| ISSN: | 2040-3372 2040-3364 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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