Reversible Assembly and Disassembly of Receptor-Decorated Gold Nanoparticles Controlled by Ion Recognition
Reversible Assembly and Disassembly of Receptor-Decorated Gold Nanoparticles Controlled by Ion Recognition
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DOI：
10.1002/chem.201404421
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发表时间：
2015-02-02
影响因子：
4.3
通讯作者：
Sessler, Jonathan L.
中科院分区：
文献类型：
--
作者：
Aydogan, Abdullah;Lee, Gawon;Sessler, Jonathan L.
随机分散的胶体颗粒的受控组装可以提供获得具有先进光学和电子性能的材料的途径，同时提供对自然界和纳米技术中的自组装过程的基本见解。通常，自组装纳米粒子是通过利用静电相互作用、光刻技术和共价连接的分子支架来制备的。这导致了不容易拆卸的静态形态。另一方面，能够接触到可以以受控方式组装或拆卸的系统，可以深入了解纳米颗粒，并合理控制所产生的结构的形态和基本性质。如果聚集性的变化是由特定的外部化学刺激引起的，它也可能允许开发新的化学传感器。在这里，我们展示了通过调节表面结合的杯[4]吡咯和添加的双咪唑阳离子之间的非共价相互作用来实现金纳米颗粒的可逆组装和分解。我们还展示了这些纳米颗粒在阴离子选择性传感中的应用。
The controlled assembly of randomly dispersed colloidal particles can provide access to materials with advanced optical and electronic properties while providing fundamental insights into self-assembly processes in nature and nanotechnology. Typically, self-assembled nanoparticles are prepared by exploiting electrostatic interactions, lithographic techniques, and covalently linked molecular scaffolds. This results in static morphologies that cannot be disassembled easily. On the other hand, having access to systems that can be assembled or disassembled in a controlled manner could allow for in-depth understanding of the nanoparticles as well as rational control over the morphology and fundamental properties of the resulting constructs. If the changes in aggregation are induced by a specific external chemical stimulus, it could also permit the development of new chemosensors. Here we demonstrate the reversible assembly and disassembly of gold nanoparticles achieved by modulating the noncovalent interactions between surface-bound calix[4]pyrroles and added bis-imidazolium cations. We also demonstrate the use of these nanoparticles in the selective sensing of anions.