Circularly Polarized Luminescent CdS Quantum Dots Prepared in a Protein Nanocage

Naito, Masanobu; Iwahori, Keisuke; Miura, Atsushi; Yamane, Midori; Yamashita, Ichiro

doi:10.1002/ange.201002552

Cited by 52 publications

(28 citation statements)

References 17 publications

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“…6b ). The value of g lum is comparable to that observed for other semiconductor materials such as cysteine-capped CdSe nanoparticles 33 (3 × 10 −3 and 4 × 10 −3 ) and CdS nanoparticles templated in a protein nanocage 34 (4.4 × 10 −3 ), though our macroscale twisting process is considerably simpler.…”

Section: Resultssupporting

confidence: 82%

Multiscale deformations lead to high toughness and circularly polarized emission in helical nacre-like fibres

et al. 2016

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Nacre-like composites have been investigated typically in the form of coatings or free-standing sheets. They demonstrated remarkable mechanical properties and are used as ultrastrong materials but macroscale fibres with nacre-like organization can improve mechanical properties even further. The fiber form or nacre can, simplify manufacturing and offer new functional properties unknown yet for other forms of biomimetic materials. Here we demonstrate that nacre-like fibres can be produced by shear-induced self-assembly of nanoplatelets. The synergy between two structural motifs—nanoscale brick-and-mortar stacking of platelets and microscale twisting of the fibres—gives rise to high stretchability (>400%) and gravimetric toughness (640 J g−1). These unique mechanical properties originate from the multiscale deformation regime involving solid-state self-organization processes that lead to efficient energy dissipation. Incorporating luminescent CdTe nanowires into these fibres imparts the new property of mechanically tunable circularly polarized luminescence. The nacre-like fibres open a novel technological space for optomechanics of biomimetic composites, while their continuous spinning methodology makes scalable production realistic.

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Section: Resultssupporting

confidence: 82%

Multiscale deformations lead to high toughness and circularly polarized emission in helical nacre-like fibres

et al. 2016

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“…22 CPL was only observed for CdS prepared from scratch in a nanocage of an apoferritin. 25 CPL induced by chiral capping ligand has not been observed previously. The circularly polarized luminescence (Δ I ) and total luminescence ( I ) spectra measured for L-cysteine- and D-cysteine capped CdSe QDs in aqueous solutions at 295 K are shown in Figure 5.…”

Section: Resultsmentioning

confidence: 66%

Ligand Induced Circular Dichroism and Circularly Polarized Luminescence in CdSe Quantum Dots

et al. 2013

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Chiral thiol capping ligands L- and D-cysteines induced modular chiroptical properties in achiral cadmium selenide quantum dots (CdSe QDs). Cys-CdSe prepared from achiral oleic acid capped CdSe by post-synthetic ligand exchange displayed size-dependent electronic circular dichroism (CD) and circularly polarized luminescence (CPL). Opposite CPL signals were measured for the CdSe QDs capped with D- and L-cysteine. The CD profile and CD anisotropy varied with size of CdSe nanocrystals with largest anisotropy observed for CdSe nanoparticles of 4.4 nm. Magic angle spinning solid state NMR (MAS ssNMR) experiments suggested bidentate interaction between cysteine and the surface of CdSe. Density functional theory (DFT) calculations verified that attachment of L- and D-cysteine to the surface of model (CdSe)13 nanoclusters induces measurable opposite CD signals for the exitonic band of the nanocluster. The chirality was induced by the hybridization of highest occupied CdSe molecular orbitals with those of the chiral ligand.

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“…For example, the luminescent centres could be achiral fluorescent organic dyes, inorganic semiconductor quantum dots (CdSe, ZnS), or metal clusters (Ag). Various chiral hosts are often chiral‐organic capping agents and solvents, protein nanocages, polymer‐based liquid crystals, helical supramolecular assemblies, etc . It is well known that in the host–guest strategy, the current chiral hosts are always dominated by organics .…”

Section: Methodsmentioning

confidence: 99%

Circularly Polarized Luminescence from Inorganic Materials: Encapsulating Guest Lanthanide Oxides in Chiral Silica Hosts

Sugimoto

Liu

Tsunega

et al. 2018

Chemistry A European J

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Recently, circularly polarized luminescence (CPL)-active systems have become a very hot and interesting subject in chirality- and optics-related areas. The CPL-active systems are usually available by two approaches: covalently combining a luminescent centre to chiral motif or associating the guest of luminescent probe to a chiral host. However, all the chiral components in CPL materials were organic, although the luminescent components were alternatively organics or inorganics. Herein, the first totally inorganic CPL-active system by "luminescent guest-chiral host" strategy is proposed. Luminescent sub-10 nm lanthanide oxides (Eu O or Tb O ) nanoparticles (guests) were encapsulated into chiral non-helical SiO nanofibres (host) through calcination of chiral SiO hybrid nanofibres, trapping Eu (or Tb ). These lanthanide oxides display circular dichroism (CD) optical activity in the ultraviolet wavelength and CPL signals around at 615 nm for Eu and 545 nm for Tb . This work has implications for inorganic-based CPL-active systems by incorporation of various luminescent guests within chiral inorganic hosts.

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Circularly Polarized Luminescent CdS Quantum Dots Prepared in a Protein Nanocage

Cited by 52 publications

References 17 publications

Multiscale deformations lead to high toughness and circularly polarized emission in helical nacre-like fibres

Multiscale deformations lead to high toughness and circularly polarized emission in helical nacre-like fibres

Ligand Induced Circular Dichroism and Circularly Polarized Luminescence in CdSe Quantum Dots

Circularly Polarized Luminescence from Inorganic Materials: Encapsulating Guest Lanthanide Oxides in Chiral Silica Hosts

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