Self-assembling of monolayer-protected gold nanoparticles
被引:122
作者:
Chen, SW
论文数: 0引用数: 0
h-index: 0
机构:
So Illinois Univ, Dept Chem & Biochem, Carbondale, IL 62901 USASo Illinois Univ, Dept Chem & Biochem, Carbondale, IL 62901 USA
Chen, SW
[1
]
机构:
[1] So Illinois Univ, Dept Chem & Biochem, Carbondale, IL 62901 USA
来源:
JOURNAL OF PHYSICAL CHEMISTRY B
|
2000年
/
104卷
/
04期
关键词:
D O I:
10.1021/jp993524y
中图分类号:
O64 [物理化学(理论化学)、化学物理学];
学科分类号:
070304 ;
081704 ;
摘要:
Self-assembling of monolayer-protected gold nanoclusters onto a gold electrode surface was reported. The particles were surface-active with multiple copies of peripheral thiol groups that resulted from an exchange reaction with alkanedithiols. Excessive dithiol and displaced thiol ligands were removed from the cluster exchange solution via liquid extraction using a hexane-methanol system. The self-assembling process appeared to be rather fast, similar to that for simple alkanethiols. The resulting particle adlayers exhibited discrete electron-transfer features that were ascribed to the quantized capacitance charging to the particle double layers. The electrode double-layer capacitance, evaluated from impedance measurements, also showed a modulation with electrode potentials. Consistent electron-transfer rate constants were obtained from the Laviron evaluation as well as from the impedance measurements. The electron-charging behaviors were also quite visible in aqueous media when the interparticle "void" space was filled up with low-dielectric organic adlayers. Technical implications of these particle assemblies were also discussed.