Muto, Hitomi and Yamada, Kunihiro and Miyajima, Ken and Mafune, Fumitaka (2007) Estimation of surface oxide on surfactant-free gold nanoparticles laser-ablated in water. JOURNAL OF PHYSICAL CHEMISTRY C, 111 (46). pp. 17221-17226.
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Official URL: http://pubs.acs.org/doi/abs/10.1021/jp076923z
Surfactant-free gold nanoparticles were prepared by laser ablation of a gold metal plate in water. The nanoparticles were characterized by absorption spectroscopy, zeta-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.
|Subjects:||Analytical Science > Microscopy and probe methods|
Material Science > Nanostructured materials
|Deposited By:||Farnush Anwar|
|Deposited On:||15 Jan 2009 13:29|
|Last Modified:||28 Jan 2009 15:46|
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