Liquid Crystal Templated Chiral Plasmonic Films with Dynamic Tunability and Moldability

Grzelak, Dorota; Tupikowska, Martyna; Vila‐Liarte, David; Beutel, Dominik; Bagiński, Maciej; Parzyszek, Sylwia; Góra, Monika; Rockstuhl, Carsten; Liz‐Marzán, Luis M.; Lewandowski, Wiktor

doi:10.1002/adfm.202111280

Cited by 29 publications

(32 citation statements)

References 80 publications

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“…To prepare CPL-active, multicomponent films, we decided to use a thermotropic liquid crystal, an organic-imine matrix (OIM, Figure a,b) which comprises five aromatic rings connected via ester and imine moieties, constituting a stiff core of the molecule; the core is functionalized with two oleyl chains at opposite ends (Supplementary Notes 1, 2, 3). Previously, the OIM was shown to act as an efficient template to induce a double-helical arrangement of Au NPs, providing access to films exhibiting chiral plasmonic absorption . The driving mechanism is that upon cooling in the film state, the molecular architecture of the OIM supports the formation of layered assemblies.…”

Section: Resultsmentioning

confidence: 99%

Tunable Circularly Polarized Luminescence via Chirality Induction and Energy Transfer from Organic Films to Semiconductor Nanocrystals

et al. 2022

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Circularly polarized luminescent (CPL) films with high dissymmetry factors hold great potential for optoelectronic applications. Herein, we propose a strategy for achieving strongly dissymetric CPL in nanocomposite films based on chirality induction and energy transfer to semiconductor nanocrystals. First, focusing on a purely organic system, aggregation-induced emission (AIE) and CPL activity of organic liquid crystals (LCs) forming helical nanofilaments was detected, featuring green emission with high dissymmetry factors g lum ∼ 10 −2 . The handedness of helical filaments, and thus the sign of CPL, was controlled via minute amounts of a small chiral organic dopant. Second, nanocomposite films were fabricated by incorporating InP/ZnS semiconductor quantum dots (QDs) into the LC matrix, which induced the chiral assembly of QDs and endowed them with chiroptical properties. Due to the spectral matching of the components, energy transfer (ET) from LC to QDs was possible enabling a convenient way of tuning CPL wavelengths by varying the LC/QD ratio. As obtained, composite films exhibited absolute g lum values up to ∼10 −2 and thermally on/off switchable luminescence. Overall, we demonstrate the induction of chiroptical properties by the assembly of nonchiral building QDs on the chiral organic template and energy transfer from organic films to QDs, representing a simple and versatile approach to tune the CPL activity of organic materials.

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Section: Resultsmentioning

confidence: 99%

Tunable Circularly Polarized Luminescence via Chirality Induction and Energy Transfer from Organic Films to Semiconductor Nanocrystals

et al. 2022

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“…Interestingly, the identification and mechanical removal of domains formed in homochiral nanomaterials allow the measurement of plasmonic CD signals from microscale regions 189 . By using micro-CD measurements, Szusta- plasmonic CD by temperature-driven self-assembly of a mixture composed of a liquid-crystalline matrix, a chiral dopant, and gold nanoparticles 190 . The strategy proved to efficiently select chirality by allowing the chiral dopant to act in the nucleation phase and provide an enantiomeric excess of HNFs of a given handedness in the thin film (Fig.…”

Section: Chiral Nanomaterials Based On Thermotropic Liquid Crystal Te...mentioning

confidence: 99%

Liquid crystal-templated chiral nanomaterials: from chiral plasmonics to circularly polarized luminescence

et al. 2022

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Chiral nanomaterials with intrinsic chirality or spatial asymmetry at the nanoscale are currently in the limelight of both fundamental research and diverse important technological applications due to their unprecedented physicochemical characteristics such as intense light-matter interactions, enhanced circular dichroism, and strong circularly polarized luminescence. Herein, we provide a comprehensive overview of the state-of-the-art advances in liquid crystal-templated chiral nanomaterials. The chiroptical properties of chiral nanomaterials are touched, and their fundamental design principles and bottom-up synthesis strategies are discussed. Different chiral functional nanomaterials based on liquid-crystalline soft templates, including chiral plasmonic nanomaterials and chiral luminescent nanomaterials, are systematically introduced, and their underlying mechanisms, properties, and potential applications are emphasized. This review concludes with a perspective on the emerging applications, challenges, and future opportunities of such fascinating chiral nanomaterials. This review can not only deepen our understanding of the fundamentals of soft-matter chirality, but also shine light on the development of advanced chiral functional nanomaterials toward their versatile applications in optics, biology, catalysis, electronics, and beyond.

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“…The first was an oleyl-imine-matrix (M1), a liquid crystalline compound, which upon cooling from an elevated temperature (isotropic phase) forms an LC phase composed of helical nanofilaments ( Figure 4 a). 66 Notably, the heat annealing procedure, required for achieving composites of helical nanofilaments with nanoinclusions, imposes requirements of thermal stability of NPs up to 155 °C. Therefore, it is important to investigate not only the chemical compatibility of AuNRs to M1 but also their thermal stability.…”

Section: Resultsmentioning

confidence: 99%

“…Hydrophobic thiols HT1, HT2, and HT5 (as well as all intermediate compounds) were obtained following procedures described in our previous works. ,, Compound HT3 was obtained using a procedure analogous to the synthesis of the compound HT1 (cetyl alcohol was used in the place of oleyl alcohol in step VI, Figure S16, Note S4). Compound HT4 was obtained using a procedure analogous to the synthesis of the compound HT2 (oleyl alcohol was used in the place of cetyl alcohol in step VI, Figure S16, Note S4).…”

Section: Methodsmentioning

confidence: 99%

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Hydrophobic Gold Nanoparticles with Intrinsic Chirality for the Efficient Fabrication of Chiral Plasmonic Nanocomposites

Kowalska

Bandalewicz

Kowalski

et al. 2022

ACS Appl. Mater. Interfaces

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The development of plasmonic nanomaterials with chiral geometry has drawn extensive attention owing to their practical implications in chiral catalysis, chiral metamaterials, or enantioselective biosensing and medicine. However, due to the lack of effective synthesis methods of hydrophobic nanoparticles (NPs) showing intrinsic, plasmonic chirality, their applications are currently limited to aqueous systems. In this work, we resolve the problem of achieving hydrophobic Au NPs with intrinsic chirality by efficient phase transfer of water-soluble NPs using low molecular weight, liquid crystal-like ligands. We confirmed that, after the phase transfer, Au NPs preserve strong, far-field circular dichroism (CD) signals, attesting their chiral geometry. The universality of the method is exemplified by using different types of NPs and ligands. We further highlight the potential of the proposed approach to realize chiral plasmonic, inorganic/organic nanocomposites with block copolymers, liquid crystals, and compounds forming physical gels. All soft matter composites sustain plasmonic CD signals with electron microscopies confirming well-dispersed nanoinclusions. The developed methodology allows us to expand the portfolio of plasmonic NPs with intrinsic structural chirality, thereby broadening the scope of their applications toward softmatter based systems.

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Liquid Crystal Templated Chiral Plasmonic Films with Dynamic Tunability and Moldability

Cited by 29 publications

References 80 publications

Tunable Circularly Polarized Luminescence via Chirality Induction and Energy Transfer from Organic Films to Semiconductor Nanocrystals

Tunable Circularly Polarized Luminescence via Chirality Induction and Energy Transfer from Organic Films to Semiconductor Nanocrystals

Liquid crystal-templated chiral nanomaterials: from chiral plasmonics to circularly polarized luminescence

Hydrophobic Gold Nanoparticles with Intrinsic Chirality for the Efficient Fabrication of Chiral Plasmonic Nanocomposites

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