Optically Active Semiconductor Nanosprings for Tunable Chiral Nanophotonics

Baimuratov, Anvar S.; Pereziabova, Tatiana P.; Leonov, Mikhail Yu.; Zhu, Weiren; Баранов, А. В.; Fedorov, Anatoly V.; Gun’ko, Yurii K.; Rukhlenko, Ivan D.

doi:10.1021/acsnano.8b02867

Cited by 16 publications

(16 citation statements)

References 49 publications

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“…Referring to the orbital distribution in the CsPbBr 3 nanocluster 38 , the locations of the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) around Pb and Br atoms indicate that the screw dislocation among Pb-Br crystals may result in significant optical activity. By this inference, the origins of the CD signal come from the screw orbital geometry-induced electron scattering, as discussed in many studies [39][40][41] .…”

Section: Resultsmentioning

confidence: 88%

Autonomous discovery of optically active chiral inorganic perovskite nanocrystals through an intelligent cloud lab

et al. 2020

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We constructed an intelligent cloud lab that integrates lab automation with cloud servers and artificial intelligence (AI) to detect chirality in perovskites. Driven by the materials acceleration operating system in cloud (MAOSIC) platform, on-demand experimental design by remote users was enabled in this cloud lab. By employing artificial intelligence of things (AIoT) technology, synthesis, characterization, and parameter optimization can be autonomously achieved. Through the remote collaboration of researchers, optically active inorganic perovskite nanocrystals (IPNCs) were first synthesized with temperature-dependent circular dichroism (CD) and inversion control. The inter-structure (structural patterns) and intrastructure (screw dislocations) dual-pattern-induced mechanisms detected by MAOSIC were comprehensively investigated, and offline theoretical analysis revealed the thermodynamic mechanism inside the materials. This self-driving cloud lab enables efficient and reliable collaborations across the world, reduces the setup costs of in-house facilities, combines offline theoretic analysis, and is practical for accelerating the speed of material discovery.

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Section: Resultsmentioning

confidence: 88%

Autonomous discovery of optically active chiral inorganic perovskite nanocrystals through an intelligent cloud lab

et al. 2020

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“…Tandem measurements in which the chirality of the sensitizer matches the polarization preference of a chiral film may further enhance spin-injection efficiencies. Theoretical and experimental works are pointing to other ways of controlling light–matter interactions with strong dissymmetric optical responses, and the parameters important for spin filtering in chiral films are becoming apparent. ,− The marriage between these two fields to create more efficient spin injectors is currently in progress.…”

Section: Chiral Optoelectronic and Spintronic Applicationsmentioning

confidence: 99%

Spin Selectivity in Photoinduced Charge-Transfer Mediated by Chiral Molecules

et al. 2019

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Optical control and readout of electron spin and spin currents in thin films and nanostructures have remained attractive yet challenging goals for emerging technologies designed for applications in information processing and storage. Recent advances in room-temperature spin polarization using nanometric chiral molecular assemblies suggest that chemically modified surfaces or interfaces can be used for optical spin conversion by exploiting photoinduced charge separation and injection from well-coupled organic chromophores or quantum dots. Using light to drive photoexcited charge-transfer processes mediated by molecules with central or helical chirality enables indirect measurements of spin polarization attributed to the chiral-induced spin selectivity effect and of the efficiency of spin-dependent electron transfer relative to competitive relaxation pathways. Herein, we highlight recent approaches used to detect and to analyze spin selectivity in photoinduced charge transfer including spin-transfer torque for local magnetization, nanoscale charge separation and polarization, and soft ferromagnetic substrate magnetization- and chirality-dependent photoluminescence. Building on these methods through systematic investigation of molecular and environmental parameters that influence spin filtering should elucidate means to manipulate electron spins and photoexcited states for room-temperature optoelectronic and photospintronic applications.

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“…For example, it was shown that quartz, β-AgSe, α-HgS, selenium and tellurium crystals have chiral crystal structure and corresponding NCs have two enantiomers [37][38][39]. (ii) Chiral NP shape: NCs of intrinsically achiral materials may be grown in a chiral shape, e.g., twisted CdTe nanoribbons [40][41][42], nanosprings [43], nanoscrolls [44][45][46], plasmonic and semiconductor gammadions [47,48] and other chiral shapes [49,50]. (iii) Chiral assembly: achiral NPs may be assembled in chiral superstructures, e.g., DNA has been used to assemble NPs in helixes [51,52] and chiral "molecules" can be fabricated from coupled achiral semiconductor NCs [53,54].…”

Section: Introductionmentioning

confidence: 99%

Ligand-induced chirality and optical activity in semiconductor nanocrystals: theory and applications

et al. 2020

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Chirality is one of the most fascinating occurrences in the natural world and plays a crucial role in chemistry, biochemistry, pharmacology, and medicine. Chirality has also been envisaged to play an important role in nanotechnology and particularly in nanophotonics, therefore, chiral and chiroptical active nanoparticles (NPs) have attracted a lot of interest over recent years. Optical activity can be induced in NPs in several different ways, including via the direct interaction of achiral NPs with a chiral molecule. This results in circular dichroism (CD) in the region of the intrinsic absorption of the NPs. This interaction in turn affects the optical properties of the chiral molecule. Recently, studies of induced chirality in quantum dots (QDs) has deserved special attention and this phenomenon has been explored in detail in a number of important papers. In this article, we review these important recent advances in the preparation and formation of chiral molecule–QD systems and analyze the mechanisms of induced chirality, the factors influencing CD spectra shape and the intensity of the CD, as well as the effect of QDs on chiral molecules. We also consider potential applications of these types of chiroptical QDs including sensing, bioimaging, enantioselective synthesis, circularly polarized light emitters, and spintronic devices. Finally, we highlight the problems and possibilities that can arise in research areas concerning the interaction of QDs with chiral molecules and that a mutual influence approach must be taken into account particularly in areas, such as photonics, cell imaging, pharmacology, nanomedicine and nanotoxicology.

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Optically Active Semiconductor Nanosprings for Tunable Chiral Nanophotonics

Cited by 16 publications

References 49 publications

Autonomous discovery of optically active chiral inorganic perovskite nanocrystals through an intelligent cloud lab

Autonomous discovery of optically active chiral inorganic perovskite nanocrystals through an intelligent cloud lab

Spin Selectivity in Photoinduced Charge-Transfer Mediated by Chiral Molecules

Ligand-induced chirality and optical activity in semiconductor nanocrystals: theory and applications

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