研究目的
Investigating the effect of electron injection on the chiral plasmon modes of helical nanorod assemblies and understanding the mechanism behind the shift in plasmonic chirality due to nanorod charging.
研究成果
The study demonstrated the possibility of tuning chiral surface plasmon modes in helical nanorod assemblies driven by charge injection. The charging/discharging methods described can function as a new approach for the effective tuning of the chiral surface plasmon modes in nanoassemblies, which is extremely important in the field of chiral biosensing and metamaterials.
研究不足
The methodology does not allow for a precise control over the interparticle distance, and the concentrations of sodium borohydride used are too low to cause any structural deformation of the nanocomposites.
1：Experimental Design and Method Selection:
The study involved the synthesis of small gold nanorods and their assembly on α-synuclein nanofibrils as chiral templates. The effect of charge injection was studied by adding sodium borohydride to the dispersion of Au nanorod-protein fibril nanocomposite structures. Theoretical simulations were conducted to understand the role of electron charging on chiral surface plasmon modes.
2：Sample Selection and Data Sources:
Small gold nanorods (length = 23 nm, width = 7 nm) were synthesized and assembled on α-synuclein nanofibrils. The spectral changes were monitored using extinction and circular dichroism spectra.
3：List of Experimental Equipment and Materials:
Sodium borohydride, HAuCl4, cetyltrimethylammonium bromide (CTAB), AgNO3, ascorbic acid, HCl, α-synuclein protein.
4：Experimental Procedures and Operational Workflow:
The synthesis of Au nanorods, fibrillation of α-synuclein, and the assembly of nanorods on fibrils were carried out. The effect of charge injection was studied by adding sodium borohydride and monitoring the spectral changes over time.
5：Data Analysis Methods:
The changes in electron density and the corresponding modified dielectric function during nanorod charging were taken into account for simulating the helical assemblies. Extinction and CD spectra of Au nanorod assemblies were simulated considering varying degrees of Au nanorod charging.
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