Effects of Branched Ligands on the Structure and Stability of Monolayers on Gold Nanoparticles

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• 作者：Ralph Paulini ; Benjamin L. Frankamp ; and Vincent M. Rotello
• 刊名：Langmuir
• 出版年：2002
• 出版时间：March 19, 2002
• 年：2002
• 卷：18
• 期：6
• 页码：2368 - 2373
• 全文大小：117K
• 年卷期：v.18,no.6(March 19, 2002)
• ISSN：1520-5827

文摘

The ability to control the structure of monolayers on radial and faceted surfaces is an important goalfor the successful application of nanoparticles in devices and materials. To investigate the effect of stericbulk in the monolayer periphery on monolayer protected gold cluster (MPC) properties, we have synthesizeda series of gold nanoparticles having amide functionality within the monolayer chains and altering theperipheral end groups of the monolayer. Investigation of these MPCs using IR spectroscopy and cyanide-mediated decomposition of the gold core reveals a strong correlation between the strength of theintramonolayer hydrogen bonding and the maximal decomposition rate. Additionally, comparison withcorresponding ester-functionalized derivatives indicates that the hydrogen bonding amide unit in themonolayer emphasizes the effects of the peripheral groups on monolayer surface packing and MPC properties.