Printing of Chiral Plasmonic Nanorosettes with Circularly Polarized Light and their Electrochemically Tunable Chiroptical Activity

Direct light-to-matter chirality transfer affords scalable printing of chiral nanoarchitectures on multiple substrates. However, controlling the areal density, spectral position, and material composition of the produced chiral “nanoforests”, while retaining their handedness, remains challenging. Here, we show that photoreduction of silver into chiral nanorosettes (CNRs) can be mediated by pre-deposited Au nanoparticles, enabling control of CNR’s sizes from sub-100 nm to >1 μ m and their areal density from 0.2 to 11 µ m −2 . When deposited on indium-tin-oxide-coated glass, CNRs can be subsequently converted into a variety of metal-semiconductor architectures by conformal electrodeposition of a semiconducting Cu 2 O shell on them, enabling continuous tuning of chiroptical features from the visible to the near-infrared parts of the electromagnetic spectrum. This methodology provides convenient access to the multiparameter design space of chiroptical properties that can be generalized to other metal-semiconductor nanoarchitectures for device-ready chiral nanoarchitectures.