Université de Rennes 1, CNRS UMR 6226, Institut des Sciences Chimiques de Rennes, Avenue du Général Leclerc, 35042, Rennes, France; Université de Rennes 1, CNRS UMR 6251, Institut de Physique de Rennes, Avenue du Général Leclerc, 35042, Rennes, France.
Small. 2014 Sep 24;10(18):3707-16. doi: 10.1002/smll.201400300. Epub 2014 May 26.
The use of peptidic ligands is validated as a generic chemical platform allowing one to finely control the organization in solid phase of semiconductor nanorods originally dispersed in an aqueous media. An original method to generate, on a macroscopic scale and with the desired geometry, three-dimensional supracrystals composed of quantum rods is introduced. In a first step, nanorods are transferred in an aqueous phase thanks to the substitution of the original capping layer by peptidic ligands. Infrared and nuclear magnetic resonance spectroscopy data prove that the exchange is complete; fluorescence spectroscopy demonstrates that the emitter optical properties are not significantly altered; electrophoresis and dynamic light scattering experiments assess the good colloidal stability of the resulting aqueous suspension. In a second step, water evaporation in a microstructured environment yields superstructures with a chosen geometry and in which nanorods obey a smectic B arrangement, as shown by electron microscopy. Incidentally, bulk drying in a capillary tube generates a similar local order, as evidenced by small angle X-ray scattering.
使用肽配体作为通用化学平台已得到验证，可用于精细控制原本分散在水介质中的半导体纳米棒在固相中有序排列。本文介绍了一种在宏观尺度上生成由量子棒组成的具有所需几何形状的三维超晶格的新方法。首先，通过用肽配体取代原始的封端层，将纳米棒转移到水相中。红外和核磁共振波谱数据证明了交换的完全性；荧光光谱表明发射体的光学性质没有明显改变；电泳和动态光散射实验评估了所得水悬浮液的良好胶体稳定性。在第二步中，在微结构化环境中蒸发水会得到具有所选几何形状的超结构，其中纳米棒呈现出向列 B 排列，这一点通过电子显微镜得到证实。顺便说一句，在毛细管中进行整体干燥会产生类似的局部有序性，这一点可通过小角 X 射线散射得到证明。
