Ilse Katz Institute for Nanotechnology and Department of Chemistry, Ben Gurion University, Beer Sheva 84105, Israel.
Langmuir. 2010 Jun 1;26(11):7893-8. doi: 10.1021/la9047903.
Self-assembly of nanostructures on surfaces is a promising area in the emerging field of "bottom-up nanolithography". We describe a systematic analysis of hydrophobically capped gold nanoparticle (Au NP) assemblies created within monolayers of saturated phospholipids deposited at the air/water interface. We show that the Au NPs are segregated within the mixed monolayers, forming distinct configurations. Microscopy analysis reveals that organized Au NP aggregates, including wires, rings, and "doughnut-shape" structures, are observed only within condensed-phase monolayers comprising phospholipids exhibiting longer acyl side-chains. In these monolayers, the Au NPs are localized at the edges of the condensed phospholipid domains. In addition to the pronounced effect of the phospholipid phases at the air/water interface, NP organization was found to depend upon the hydrophobic capping agents of the particles. The Au nanostructures assembled at the air/water interface can be transferred onto solid substrates, suggesting that the self-assembly monolayer approach could be exploited for practical nanoelectronic and sensing applications.
表面上的纳米结构自组装是新兴的“自下而上纳米光刻”领域中一个很有前途的方向。我们描述了对在空气/水界面处沉积的饱和磷脂单层内形成的疏水封端金纳米粒子（Au NP）组装体的系统分析。我们表明，Au NPs 在混合单层内被分离，形成不同的构型。显微镜分析表明，仅在包含具有较长酰基侧链的磷脂的凝聚相单层内观察到有序的 Au NP 聚集体，包括线、环和“甜甜圈形状”结构。在这些单层中，Au NPs 定位于凝聚的磷脂域的边缘。除了空气/水界面处的磷脂相的明显影响外，还发现 NP 组织取决于颗粒的疏水封端剂。在空气/水界面组装的 Au 纳米结构可以转移到固体基底上，这表明自组装单层方法可用于实际的纳米电子和传感应用。
