Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
Publication date: 18th December 2023
Thin films with chiral geometry have remarkable applications in chiral catalysis, metamaterials, biosensing and anticounterfeiting. Realizing this potential requires perfect control over structure and chiroptical properties. Can one achieve unrestricted control over chirality, leading, for example, to bi-chiral (bi-polar handed) thin films?
Yes! With the presented work, we show unrestricted control over chirality in thin films when utilizing liquid crystals. We use liquid crystal-based materials forming chiral, hierarchical structures, that exhibit strong chirooptical properties [1,2]. In this approach, a series of achiral liquid crystalline compounds are employed as a matrix, forming supramolecular, helical nanofilaments. The soft character of the LC matrix facilitates the incorporation of various dopants, such as gold nanoparticles, quantum dots or perovskites with different sizes and morphologies. Thus, chirality can be transferred to these dopants.
Regarding the material’s handedness, it is precisely controlled on different levels. Depending on the application, we aim either at bi-chiral (pixelated) films or homochiral films. Bi-chiral (pixelated) films are achieved through chirality synchronization via photothermal laser-writing, giving the possibility of unrestricted spatial distribution of chiral pixels of both handedness. Homochiral films can be achieved by employing structurally compatible chiral dopants for chirality transfer and amplification [3,4].
Regarding spectral tuneability, the helical nanofilaments guide self-assembly of these dopants in a chiral manner, enabling strong chiroptical responses in extinction and emission spectra. Notably, the emission spectra exhibit circularly polarized luminescence, with tunable maximum peak positions for different designs of the nanocomposite designs.
This methodology expands the repertoire of chiral nanostructures, providing flexibility in designing chiral systems and promising avenues for applications in circularly polarized light-based technologies.
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