Helical assembly of Au nanoparticles in 1D nanocylinders confirmed by 3D transmission electron microscopy
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초록
내용
The superstructure of chiral plasmonic nanoparticles (NPs) has proper properties for chiroptical sensors, circular polarizers, and optical metamaterials. The helical structure of NP assembly could improve the optical chirality induced by destruction of symmetric structure with NPs closely packed in confined within the cylindrical assemblies. Here, we demonstrate the assembly of polystyrene (PS)-tethered Au NPs composed of zigzag array was reconstructed into a 3D image with various angles to precisely confirm the internal NPs symmetries. The number of NP layers and the packing structures are controlled by molecular weight of PS to influence the surface plasmon resonance properties of the assemblies. These assemblies were analyzed for the location and array of NPs by 3D transmission electron microscopy. This study presents a strategy for controlling the helical assembly and plasmon optical activity of NPs and predicting the correlation between nanostructure and chiroptical properties.