Estimation of Surface Oxide on Surfactant-Free Gold Nanoparticles Laser-Ablated in Water
Estimation of Surface Oxide on Surfactant-Free Gold Nanoparticles Laser-Ablated in Water
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DOI：
10.1021/jp075582m
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发表时间：
2007-10
影响因子：
3.7
通讯作者：
H. Muto;Kunihiro Yamada;and Ken Miyajima;F. Mafuné
中科院分区：
文献类型：
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作者：
H. Muto;Kunihiro Yamada;and Ken Miyajima;F. Mafuné
通过激光烧蚀水中的金金属板来制备无表面活性剂的金纳米颗粒。纳米粒子的特征在于通过吸收光谱，X-电位测量，和XPS光谱。根据Sacher及其同事的文献（J. Phys. Chem. B，2004，108，16864），纳米颗粒带负电荷，因为表面原子被部分氧化成Au−O-。我们进一步研究了纳米粒子和阳离子表面活性剂之间的静电相互作用。发现表面活性剂阳离子附着在颗粒表面，中和颗粒电荷。利用静电相互作用，我们估计3.3 - 6.6%的表面金原子在水中被氧化。
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.