Rusch Pascal, Pluta Denis, Lübkemann Franziska, Dorfs Dirk, Zámbó Dániel, Bigall Nadja C
Institute of Physical Chemistry and Electrochemistry, Leibniz Universität Hannover, Callinstraße 3A, 30167, Hannover, Germany.
Laboratory of Nano and Quantum Engineering, Leibniz Universität Hannover, Schneiderberg 39, 30167, Hannover, Germany.
Chemphyschem. 2022 Jan 19;23(2):e202100755. doi: 10.1002/cphc.202100755. Epub 2021 Nov 23.
Employing nanocrystals (NCs) as building blocks of porous aerogel network structures allows the conversion of NC materials into macroscopic solid structures while conserving their unique nanoscopic properties. Understanding the interplay of the network formation and its influence on these properties like size-dependent emission is a key to apply techniques for the fabrication of novel nanocrystal aerogels. In this work, CdSe/CdS dot/rod NCs possessing two different CdSe core sizes were synthesized and converted into porous aerogel network structures. Temperature-dependent steady-state and time-resolved photoluminescence measurements were performed to expand the understanding of the optical and electronic properties of these network structures generated from these two different building blocks and correlate their optical with the structural properties. These investigations reveal the influence of network formation and aerogel production on the network-forming nanocrystals. Based on the two investigated NC building blocks and their aerogel networks, mixed network structures with various ratios of the two building blocks were produced and likewise optically characterized. Since the different building blocks show diverse optical response, this technique presents a straightforward way to color-tune the resulting networks simply by choosing the building block ratio in connection with their quantum yield.
将纳米晶体（NCs）用作多孔气凝胶网络结构的构建单元，能够在保留其独特纳米特性的同时，将NC材料转化为宏观固体结构。理解网络形成过程及其对诸如尺寸依赖发射等特性的影响，是应用新型纳米晶体气凝胶制造技术的关键。在这项工作中，合成了具有两种不同CdSe核尺寸的CdSe/CdS点/棒状NCs，并将其转化为多孔气凝胶网络结构。进行了温度相关的稳态和时间分辨光致发光测量，以加深对由这两种不同构建单元生成的这些网络结构的光学和电子特性的理解，并将它们的光学特性与结构特性相关联。这些研究揭示了网络形成和气凝胶生产对形成网络的纳米晶体的影响。基于所研究的两种NC构建单元及其气凝胶网络，制备了具有不同比例的这两种构建单元的混合网络结构，并同样进行了光学表征。由于不同的构建单元表现出不同的光学响应，这项技术提供了一种简单的方法，只需通过选择构建单元比例及其量子产率就能对所得网络进行颜色调节。
