The Influence Of Magnetic Field On The Chiral Superstructure And Optical Activity Of The Molecular-Metal Nano Composite System

A plasmon is a collective oscillation of the free electrons in a noble metal. Thanks to a series of novel optical properties, such as selective optical absorption and scattering as well as the local electric field enhancement, surface plasmon has emerged one of the most rapidly growing topics in nanoscience, expanding to a continuously wider range of diverse applications in nanoscience, which can mostly be attributed to significant improvements in supramolecular techniques that paved the way for the controlled design of reliable and effective plasmonic nanostructures. The unique optical properties of plasmonic nanostructures have led to many important applications in multidisciplinary fields, such as circular polarizers, chiroptical sensors, and negative refraction materials. Hence, the development of controlled assembly strategies for plasmonic structures is still at its infancy and remains a great challenge.In this work, we fabricate an assembled plasmonic helix structure based on supramolecular soft template. A three-dimensional structure of gold nanorods was successfully constructed through a hierarchical, cooperative self-assembly/self-organization process in a multiple-component system comprising of gold nanorods, surfactants, and phospholipids film. In addition, a strong circular dichroism response is observed in the visible / near infrared region. Moreover,we studied the chiroptical response of Au NRs/CTAB/lipid hybrid superstructure in a weak magnetic field. This construction of three-dimensional chiral nanostructure have values in exploiting novel plasmonic nanostructures with tunable optical activity response in the visible/NIR region, and the study of magnetically manipulate nonmagnetic(diamagnetic) materials can lead to new opportunities for controlling and steering soft matter.