Chiral recognition of optically active CoFe<sub>2</sub>O<sub>4</sub>magnetic nanoparticles by CdSe/CdS quantum dots stabilised with chiral ligands

Visheratina, Anastasia; Purcell-Milton, Finn; Serrano-García, Raquel; Кузнецова, Вера; Орлова, А. О.; Fedorov, Anatoly V.; Баранов, А. В.; Gun’ko, Yurii K.

doi:10.1039/c6tc04808k

Cited by 31 publications

(30 citation statements)

References 53 publications

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“…After the synthesis of the QDs, optical activity was induced by exchange of the original oleylamine ligands with D‐ and L‐Cys ligands . It has been demonstrated before that the ligand exchange method used in this work does not influence either the size or morphology of QDs . Absorption and PL spectra of the QDs before and after the ligand exchange are presented in Figure .…”

Section: Resultsmentioning

confidence: 81%

“…26 It has been demonstrated before that the ligand exchange method used in this work does not influence either the size or morphology of QDs. 41 Absorption and PL spectra of the QDs before and after the ligand exchange are presented in Figure 2. The edge of the first exciton absorption band was located at 300 nm approximately.…”

Section: Optical Properties Of Zns:mn Qdsmentioning

confidence: 99%

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Enantioselective cytotoxicity of ZnS:Mn quantum dots in A549 cells

et al. 2017

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Chirality strongly influences many biological properties of materials, such as cell accumulation, enzymatic activity, and toxicity. In the past decade, it has been shown that quantum dots (QDs), fluorescent semiconductor nanoparticles with unique optical properties, can demonstrate optical activity due to chiral ligands bound on their surface. Optically active QDs could find potential applications in biomedical research, therapy, and diagnostics. Consequently, it is very important to investigate the interaction of QDs capped with chiral ligands with living cells. The aim of our study was to investigate the influence of the induced chirality of Mn-doped ZnS QDs on the viability of A549 cells. These QDs were stabilized with D- and L-cysteine using a ligand exchange technique. The optical properties of QDs were studied using UV-Vis, photoluminescence (PL), and circular dichroism (CD) spectroscopy. The cytotoxicity of QDs was investigated by high content screening analysis. It was found that QDs stabilized by opposite ligand enantiomers, had identical PL and UV-Vis spectra and mirror-imaged CD spectra, but displayed different cytotoxicity: QDs capped with D-cysteine had greater cytotoxicity than L-cysteine capped QDs.

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Section: Resultsmentioning

confidence: 81%

Section: Optical Properties Of Zns:mn Qdsmentioning

confidence: 99%

Enantioselective cytotoxicity of ZnS:Mn quantum dots in A549 cells

et al. 2017

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“…Colloidal semiconductor nanoparticles with a chiral optical response are a new subclass of nanomaterials which have recently attracted significant attention due to a variety of potential applications . These nanostructures combine the tunability and control afforded by quantum confinement effects with unique properties which render them as potential candidates for use in chiral sensing, asymmetric catalysis, quantum optics, and spintronics . A limited range of semiconductor nanocrystals, such as cinnabar HgS, exhibit a chiral crystal structure and are therefore intrinsically chiral .…”

Section: Introductionmentioning

confidence: 99%

Chiral 2D Colloidal Semiconductor Quantum Wells

Yang

Kazes

Oron

2018

Adv Funct Materials

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Induced chirality in colloidal semiconductor nanoparticles has raised significant attention in the past few years as an extremely sensitive spectroscopic tool and due to the promising applications of chiral quantum dots in sensing, quantum optics, and spintronics. Yet, the origin of the induced chiroptical effects in semiconductor nanoparticles is still not fully understood, partly because almost all the theoretical and experimental studies to date are based on the simple model system of a spherical nanocrystal. Here, the realization of induced chirality in atomically flat 2D colloidal quantum wells is shown. A strong circular dichroism (CD) response as well as an absorptive-like CD line shape is observed in chiral CdSe nanoplatelets (NPLs), significantly differing from that previously observed in spherical dots. Furthermore, this intense CD signal almost completely disappears after coating with a very thin CdS shell. In contrast, CdSe-CdS core-crown NPLs exhibit a spectral response which seems to originate independently from the core and the crown regions of the NPL. This work on the one hand further advances the understanding of the fundamental origin of induced chiroptical effects in semiconductor nanoparticles, and on the other opens a pathway toward applications using chiroptical materials.

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“…This ligand was chosen due to its biocompatibility, low cost, chiral nature, stability and simplicity, avoiding the addition of any undesired functionality, or toxic effects. In addition, recent studies have shown that MNPs synthesised in the presence of chiral ligands can display novel optical properties …”

Section: Figurementioning

confidence: 99%

Synthesis and Magnetic Properties of L‐Alanine Capped CoFe₂O₄ Nanoparticles

et al. 2018

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Here we report a low cost scalable synthesis of L‐alanine capped CoFe2O4 magnetic nanoparticles, with excellent size tunability and magnetic properties. Samples were analyzed in details using electron microscopy, X‐ray powder diffraction and vibrational sample magnetometry. The magnetic nanoparticles have demonstrated excellent size distribution, uniformity and phase purity. It was found that the presence and concentration of L‐alanine ligand dramatically affects the size and morphology of the resulting CoFe2O4 nanoparticles, enabling size tunability from 120.5 to 11.3 nm. The magnetic moments of nanomaterials are ranging from 74 to 41 Am2kg−1, they are easily manipulated by an external magnetic field and show the onset of superparamagnetic behavior in the smaller nanoparticles prepared.

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Chiral recognition of optically active CoFe₂O₄magnetic nanoparticles by CdSe/CdS quantum dots stabilised with chiral ligands

Abstract: We report a new optical sensing approach based on the chiral recognition of optically active CoFe2O4magnetic nanoparticles by CdSe/CdS core/shell quantum dots stabilized with cysteine of different chiralities.

Cited by 31 publications

References 53 publications

Enantioselective cytotoxicity of ZnS:Mn quantum dots in A549 cells

Enantioselective cytotoxicity of ZnS:Mn quantum dots in A549 cells

Chiral 2D Colloidal Semiconductor Quantum Wells

Synthesis and Magnetic Properties of L‐Alanine Capped CoFe₂O₄ Nanoparticles

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Chiral recognition of optically active CoFe2O4magnetic nanoparticles by CdSe/CdS quantum dots stabilised with chiral ligands

Abstract: We report a new optical sensing approach based on the chiral recognition of optically active CoFe2O4magnetic nanoparticles by CdSe/CdS core/shell quantum dots stabilized with cysteine of different chiralities.

Cited by 31 publications

References 53 publications

Enantioselective cytotoxicity of ZnS:Mn quantum dots in A549 cells

Enantioselective cytotoxicity of ZnS:Mn quantum dots in A549 cells

Chiral 2D Colloidal Semiconductor Quantum Wells

Synthesis and Magnetic Properties of L‐Alanine Capped CoFe2O4 Nanoparticles

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Chiral recognition of optically active CoFe₂O₄magnetic nanoparticles by CdSe/CdS quantum dots stabilised with chiral ligands

Synthesis and Magnetic Properties of L‐Alanine Capped CoFe₂O₄ Nanoparticles