Seeding of Colloidal Au Nanoparticle Solutions. 2. Improved Control of Particle Size and Shape
| Autor: | Michael J. Natan, Kenneth R. Brown, Daniel G. Walter |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
education.field_of_study
Materials science General Chemical Engineering Population Nanoparticle Nanotechnology General Chemistry Metal chemistry.chemical_compound Colloid Chemical engineering chemistry Boiling visual_art Sodium citrate Materials Chemistry visual_art.visual_art_medium Seeding Particle size education |
| Zdroj: | Chemistry of Materials. 12:306-313 |
| ISSN: | 1520-5002 0897-4756 |
| Popis: | New fields of research in chemistry and physics require improved synthetic techniques for colloidal metal particles. This paper reports a generally applicable technique for synthesizing colloidal Au particles of mean diameters between 20 and 100 nm that exhibit improved monodispersity relative to previously published methods. In this approach (called “seeding”) Au3+ is reduced on the surface of preformed 12-nm-diameter Au nanoparticles by introduction of boiling sodium citrate, producing particles highly uniform in size and shape. A similar procedure, utilizing the reductant NH2OH at room temperature, produces two populations of particles; the larger population is even more spherical than citrate-reduced particles of similar size, while the smaller population is very distinctly rod-shaped. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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