Estimation of Surface Oxide on Surfactant-Free Gold Nanoparticles Laser-Ablated in Water
| Autor: | and Ken Miyajima, Kunihiro Yamada, Fumitaka Mafuné, Hitomi Muto |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
Laser ablation
Materials science Absorption spectroscopy Analytical chemistry Nanoparticle Surfaces Coatings and Films Electronic Optical and Magnetic Materials Metal General Energy X-ray photoelectron spectroscopy Chemical engineering Pulmonary surfactant Colloidal gold visual_art visual_art.visual_art_medium Particle Physical and Theoretical Chemistry |
| Zdroj: | The Journal of Physical Chemistry C. 111:17221-17226 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/jp075582m |
| Popis: | Surfactant-free gold nanoparticles were prepared by laser ablation of a gold metal plate in water. The nanoparticles were characterized by absorption spectroscopy, ζ-potential measurements, and XPS spectroscopy. The nanoparticles are negatively charged because the surface atoms are partially oxidized to Au−O-, according to the literature by Sacher and co-workers (J. Phys. Chem. B, 2004, 108, 16864). We further examined electrostatic interactions between nanoparticle and cationic surfactants. It was found that the surfactant cations attach to the particle surface, neutralizing the particle charge. Taking advantage of the electrostatic interactions, we estimated that 3.3−6.6% of the surface gold atoms was oxidized in water. |
| Databáze: | OpenAIRE |
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