Gold nanoparticles surface-terminated with bifunctional ligands

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• 作者：Shi ; Weili ; Sahoo ; Y. ; Swihart ; Mark T.
• 关键词：Gold nanoparticles ; Surface functionality ; Plasmon resonance ; Aqueous dispersion ; Surfactant conformation
• 刊名：Colloids and Surfaces A: Physicochemical and Engineering Aspects
• 出版年：2004
• 出版时间：October 1, 2004
• 年：2004
• 卷：246
• 期：1-3
• 页码：109-113
• 全文大小：209 K

文摘

Gold nanoparticles have been prepared using bifunctional ligands of the type XRSH (X = COOH, OH, NH₂) so that the surface is terminated with these functionalities. The ligands bind to the gold surface through their thiol (SH end). The coverage and binding strength of the surfactant on the gold surface have been investigated using thermogravimetric analysis and FTIR spectroscopy. The nanoparticles appear to have excess surfactants on their surface, but these do not necessarily form a bilayer structure. The surfactant conformation allows enough room for the particles to be bonded to other surfaces, such as those of another nanoparticle, even with some excess surfactant present on their surface.