Acebrón María, Herrera Facundo C, Mizrahi Martín, Navío Cristina, Bernardo-Gavito Ramón, Granados Daniel, Requejo Félix G, Juarez Beatriz H
Applied Physical Chemistry Department, Universidad Autónoma de Madrid, Cantoblanco, 28049, Madrid, Spain and IMDEA Nanoscience, Faraday 9, Cantoblanco, 28049, Madrid, Spain.
Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), CONICET and FCE, UNLP, CC/16, suc 4, 1900 La Plata, Argentina.
Phys Chem Chem Phys. 2017 Jan 18;19(3):1999-2007. doi: 10.1039/c6cp06982g.
The dielectric nature of organic ligands capping semiconductor colloidal nanocrystals (NCs) makes them incompatible with optoelectronic applications. For this reason, these ligands are regularly substituted through ligand-exchange processes by shorter (even atomic) or inorganic ones. In this work, an alternative path is proposed to obtain inorganically coated NCs. Differently to regular ligand exchange processes, the method reported here produces core-shell NCs and the removal of the original organic shell in a single step. This procedure leads to the formation of connected NCs resembling 1D worm-like networks with improved optical properties and polar solubility, in comparison with the initial CdSe NCs. The nature of the inorganic shell has been elucidated by X-ray Absorption Near Edge Structure (XANES), Extended X-ray Absorption Fine Structure (EXAFS) and X-ray Photoelectron Spectroscopy (XPS). The 1D morphology along with the lack of long insulating organic ligands and the higher solubility in polar media turns these structures very attractive for their further integration into optoelectronic devices.
包覆半导体胶体纳米晶体（NCs）的有机配体的介电性质使其不适用于光电子应用。因此，这些配体通常通过配体交换过程被更短的（甚至是原子级的）或无机配体取代。在这项工作中，我们提出了一条获得无机包覆纳米晶体的替代途径。与常规的配体交换过程不同，这里报道的方法能在一步中制备核壳纳米晶体并去除原始的有机壳层。与初始的CdSe纳米晶体相比，该过程导致形成了类似一维蠕虫状网络的连接纳米晶体，其光学性质和极性溶解度得到了改善。通过X射线吸收近边结构（XANES）、扩展X射线吸收精细结构（EXAFS）和X射线光电子能谱（XPS）阐明了无机壳层的性质。一维形态以及缺乏长的绝缘有机配体和在极性介质中更高的溶解度使得这些结构对于进一步集成到光电器件中非常有吸引力。
