Niehues Maximilian, Engel Sabrina, Ravoo Bart Jan
Organic Chemistry Institute, Westfälische Wilhelms-Universität Münster, Corrensstraße 36, D-48149 Münster, Germany.
Center for Soft Nanoscience, Westfälische Wilhelms-Universität Münster, Busso-Peus-Straße 10, D-48149 Münster, Germany.
Langmuir. 2021 Sep 21;37(37):11123-11130. doi: 10.1021/acs.langmuir.1c01979. Epub 2021 Sep 9.
Stimuli-responsive self-assembly of nanoparticles is a versatile approach for the bottom-up fabrication of adaptive and functional nanomaterials. For this purpose, anisotropic building blocks are of particular importance due to the unique shapes and structures that can be obtained upon self-assembly. Here, we demonstrate the photo-responsive self-assembly of plasmonic magnetic "dumbbell" Janus nanoparticles (Au-FeO) the host-guest interaction of the supramolecular host cyclodextrin and the molecular photoswitch arylazopyrazole. We developed efficient ligand exchange procedures that enable the introduction of functional ligands, respectively, to the surface of the gold or magnetite core of the dumbbell. Our results indicate that distinct nanoparticle superstructures arise in aqueous solutions if nanoparticle aggregation is crosslinker-induced or self-induced and that the reversible formation and fragmentation of the superstructures can be modulated with light.
纳米颗粒的刺激响应自组装是一种用于自下而上制备适应性和功能性纳米材料的通用方法。为此，各向异性构建块尤为重要，因为自组装时可获得独特的形状和结构。在此，我们展示了等离子体磁性“哑铃”型Janus纳米颗粒（Au-FeO）通过超分子主体环糊精与分子光开关芳基偶氮吡唑之间的主客体相互作用实现的光响应自组装。我们开发了高效的配体交换程序，能够分别将功能性配体引入到哑铃型纳米颗粒金核或磁铁矿核的表面。我们的结果表明，如果纳米颗粒聚集是交联剂诱导或自诱导的，在水溶液中会出现不同的纳米颗粒超结构，并且超结构的可逆形成和破碎可以用光进行调节。
