Optical chirality induced by chiral peptide assembly
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Optical chirality including circular dichroism (CD) and circular birefringence (CB) is an intrinsic optical property of chiral molecules or chiral supramolecules. To amplify this optical property, inorganic nanoparticles like gold nanoparticles (AuNPs) are added due to its unique optical property, known as surface plasmon resonance, that exhibits strong absorption band in the visible spectrum. Because morphology of AuNPs like size and distance is decisive in this context, hybrid of helical structure and AuNPs with regular pitch and width is an attractive template for controlling optical property by manipulating morphology of AuNPs. Here, with assembled nanostructures of short peptide enantiomers, AuNPs chelated along the helical fibers with fabricated the size and shape generate enhanced chiroptics. This work can provide a understanding of self-assembled structure of peptide enantiomers with opposite helictity and a useful strategy for functionalizing chiroptical nanomaterials.