Multiscale Synthesis of Chiral Structures via Metal Ion-Assisted Self-Assembly of Achiral Nanoparticles
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Chiroptical activity in a broad range allows numerous applications. However, it remains challenging to understand the mechanism of producing multiscale chirality for broad range chiroptical activities. Here, we present a simple multiscale synthesis and reveal the underlying mechanism for producing the self-assembly of achiral copper sulfide nanoparticles (NPs). The achiral NPs assemble into highly anisotropic structures with distinct handedness as metal ions act as chiral messengers that transfer chirality information from small molecules to microstructures. The resulting chiral structures exhibit strong broad chiroptical activities from ultraviolet to infrared regions under the optimal reaction conditions: pH and concentration of media. This study offers an understanding of the mechanism of chiral self-assembly and effective approaches to producing chiral inorganic materials with strong chiroptical activity, suggesting new and simple strategies for chiral material-based applications.