Self-assembly of nanoparticles into structured spherical and network aggregates
Self-assembly of nanoparticles into structured spherical and network aggregates
复制标题
DOI：
10.1038/35008037
复制
发表时间：
2000-04-13
期刊：
影响因子：
64.8
通讯作者：
Rotello, VM
中科院分区：
文献类型：
--
作者：
Boal, AK;Ilhan, F;Rotello, VM
材料的多尺度有序化是分子系统（1-3）在宏观器件（4，5）中应用的核心。基于非共价相互作用的选择性控制的自组装（6-8）为在分子水平上创建结构化系统提供了有力的工具，并且将该方法应用于大分子系统提供了将此类结构扩展到宏观长度尺度的手段（9-11）。单层功能化纳米颗粒可以用各种各样的金属和非金属核制成，为这种方法提供了多功能的构建块。在这里，我们提出了一个聚合物介导的“砖和砂浆”的纳米粒子到结构化组件的顺序策略。这种方法允许单层保护的金颗粒自组装成结构化的聚集体，同时热控制它们的大小和形态。使用2-nm金颗粒作为构建块，我们表明，在23 ℃下可以产生尺寸为97 +/- 17 nm的球形聚集体，并且在-20 ℃下形成具有（5-40）× 10（5）个单独亚基的0.5-1 μ m球形组装体。有趣的是，在10摄氏度下形成了类似于50纳米亚基的扩展网络，说明了我们的方法形成不同结构基序（如电线和棒）的潜力。这些研究结果表明，组装过程提供了对所得骨料的控制，而“砖块和砂浆”方法的模块化允许对成分进行组合控制，为新材料系统提供了一条通用的途径。
Multi-scale ordering of materials is central for the application of molecular systems(1-3) in macroscopic devices(4,5). Self-assembly based on selective control of non-covalent interactions(6-8) provides a powerful tool for the creation of structured systems at a molecular level, and application of this methodology to macromolecular systems provides a means for extending such structures to macroscopic length scale(9-11). Monolayer-functionalized nanoparticles can be made with a wide variety of metallic and nonmetallic cores, providing a versatile building block for such approaches. Here we present a polymer-mediated 'bricks and mortar' strategy for the ordering of nanoparticles into structured assemblies. This methodology allows monolayer-protected gold particles to self-assemble into structured aggregates while thermally controlling their size and morphology. Using 2-nm gold particles as building blocks, we show that spherical aggregates of size 97 +/- 17 nm can be produced at 23 degrees C, and that 0.5-1 mu m spherical assemblies with (5-40) x 10(5) individual subunits form at -20 degrees C. Intriguingly, extended networks of similar to 50-nm subunits are formed at 10 degrees C, illustrating the potential of our approach for the formation of diverse structural motifs such as wires and rods. These findings demonstrate that the assembly process provides control over the resulting aggregates, while the modularity of the 'bricks and mortar' approach allows combinatorial control over the constituents, providing a versatile route to new materials systems.