Abstract
Self-assembly of metal nanoparticles has applications in the fabrication of optically active materials. Here, we introduce a facile strategy for the fabrication of films of binary nanoparticle assemblies. Dynamic control over the configuration of gold nanorods and nanospheres is achieved via the melting of bound and unbound fractions of liquid-crystal-like nanoparticle ligands. This approach provides a route for the preparation of hierarchical nanoparticle superstructures with applications in reversibly switchable, visible-range plasmonic technologies.
Highlights
Strong and controllable light–matter interactions of metallic nanoparticles (NPs), enabled by localized surface plasmon resonances, make them ideal candidates for the construction of compact, optically active elements in future generations of optoelectronic devices [1,2,3,4,5]
Exploration of shape and ligand complementarity of NPs, inspired by the periodic nature of crystal lattices of common materials [8], can e.g., result in strikingly different optical properties in layered, binary assemblies, depending on the arrangement of layers [9]. Another approach to advance coupled plasmonic materials relies on the fabrication of active plasmonic NP systems that can be tuned or reversibly switched by an external stimulus [10]
I.e., achieving binary and active plasmonic systems within a single composite, is an emerging trend allowing us to benefit from the unique characteristics of binary and active NP assemblies
Summary
Strong and controllable light–matter interactions of metallic nanoparticles (NPs), enabled by localized surface plasmon resonances, make them ideal candidates for the construction of compact, optically active elements in future generations of optoelectronic devices [1,2,3,4,5]. One way is obtaining unconventional phases [7] of NPs in binary and ordered systems In this way, exploration of shape and ligand complementarity of NPs, inspired by the periodic nature of crystal lattices of common materials [8], can e.g., result in strikingly different optical properties in layered, binary assemblies, depending on the arrangement of layers [9]. Exploration of shape and ligand complementarity of NPs, inspired by the periodic nature of crystal lattices of common materials [8], can e.g., result in strikingly different optical properties in layered, binary assemblies, depending on the arrangement of layers [9] Another approach to advance coupled plasmonic materials relies on the fabrication of active plasmonic NP systems that can be tuned or reversibly switched by an external stimulus [10]. The fabrication of binary active materials is extremely challenging
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