A Generalized Ligand-Exchange Strategy Enabling Sequential Surface Functionalization of Colloidal Nanocrystals
A Generalized Ligand-Exchange Strategy Enabling Sequential Surface Functionalization of Colloidal Nanocrystals
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DOI：
10.1021/ja108948z
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发表时间：
2011-02-02
影响因子：
15
通讯作者：
Murray, Christopher B.
中科院分区：
文献类型：
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作者：
Dong, Angang;Ye, Xingchen;Murray, Christopher B.
由于纳米材料的许多物理和化学性质都受到表面化学的强烈影响，因此设计纳米晶体表面特性的能力对于各种应用都很重要。在这里，我们报告了一种简单的配体交换方法，该方法可以在保持NC尺寸和形状的同时实现胶体NC的顺序表面功能化和相转移。四氟硼酸亚硝基铵（NOBF4）被用来取代附着在NC表面的原始有机配体，使NC在各种极性亲水性介质（如N，N-二甲基甲酰胺）中稳定多年，未观察到聚集或沉淀。这种方法适用于各种不同尺寸和形状的nc（金属氧化物、金属、半导体和电介质）。所获得的亲水NCs随后可以使用各种封盖分子进一步功能化，根据所使用的分子赋予NCs不同的表面功能化。我们的工作为NC表面功能化提供了一种通用的配体交换策略，并代表了对NC表面特性进行可控工程设计的重要一步。
The ability to engineer surface properties of nanocrystals (NCs) is important for various applications, as many of the physical and chemical properties of nanoscale materials are strongly affected by the surface chemistry. Here, we report a facile ligand-exchange approach, which enables sequential surface functionalization and phase transfer of colloidal NCs while preserving the NC size and shape. Nitrosonium tetrafluoroborate (NOBF4) is used to replace the original organic ligands attached to the NC surface, stabilizing the NCs in various polar, hydrophilic media such as N,N-dimethylformamide for years, with no observed aggregation or precipitation. This approach is applicable to various NCs (metal oxides, metals, semiconductors, and dielectrics) of different sizes and shapes. The hydrophilic NCs obtained can subsequently be further functionalized using a variety of capping molecules, imparting different surface functionalization to NCs depending on the molecules employed. Our work provides a versatile ligand-exchange strategy for NC surface functionalization and represents an important step toward controllably engineering the surface properties of NCs.