Chiral nanoscale building blocks—from understanding to applications

Kitaev, Vladimir

doi:10.1039/b808054b

Cited by 76 publications

(66 citation statements)

References 46 publications

(75 reference statements)

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“…Assembly of chiral CBBs should, in principle, lead to formation of supramolecular structures similar to cholesteric liquid crystals. 26 One of the possible routes to realization of chirality in CBBs is imprinting with chiral ligands. For instance, intrinsically non-chiral colloids, such as nanoprisms, stabilized with chiral ligands were shown to assemble into helical columnar colloidal crystals resembling chiral liquid crystal mesophases.…”

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confidence: 99%

Bottom-up assembly of photonic crystals

et al. 2013

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Bottom-up assembly of photonic crystals

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“…It has also been envisaged that chirality could play an important role in nanotechnology. 1,2 The majority of existing research in this field has been focused on chiral organic, metallorganic and biological molecules and their supramolecular structures, 3 while research in the area of chiral inorganic nanoparticles is still in the very early stage of its development. For example, there has been some work involving chiral optically active metallic gold 4,5 and silver 6,7 nanoparticles, as well as carbon nanotubes.…”

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confidence: 99%

Synthesis and spectroscopic studies of chiral CdSe quantum dots

et al. 2010

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Using microwave irradiation, water soluble, optically active, penicillamine (Pen) capped CdSe nanocrystals with broad spectral distribution (430-780 nm) of photoluminescence have been produced and studied by a range of instrumental techniques including absorption, circular dichroism and both steady state and time resolved photoluminescence spectroscopy. The photoluminescence of these nanocrystals is attributed to emission from surface defect states. The decay of the excited state in the nanosecond region, which can be analysed as a triple exponential, depends strongly on the emission wavelength selected, but only weakly on the excitation wavelength. Graphical Abstract: IntroductionChirality is a common occurrence in the natural world and chiraln compounds are very important in chemistry, biology, pharmacology and medicine. It has also been envisaged that chirality could play an important role in nanotechnology. 1,2 The majority of existing research in this field has been focused on chiral organic, metallorganic and biological molecules and their supramolecular structures, 3 while research in the area of chiral inorganic nanoparticles is still in the very early stage of its development. For example, there has been some work involving chiral optically active metallic gold 4,5 and silver 6,7 nanoparticles, as well as carbon nanotubes. 8,9 However, there are currently only a few recent papers dealing with chiral light emitting semiconducting nanocrystals (quantum dots). [10][11][12][13][14] In general over the last decade much attention has been directed towards II-VI type CdS, CdTe and CdSe quantum dots (QDs). [15][16][17][18][19] It is the ability to fine-tune their optical properties by chemical control of their size and shape (i.e. their degree of quantum confinement) which makes quantum dots particularly interesting. This level of optical control combined with QDs' resistance to photobleaching and their high level of solubility in practically any solvent (depending on the stabiliser used) make these nanomaterials potentially suited for roles as divergent as light emitting diodes, 20 biological sensors 21 and photovoltaic devices. [22][23][24] Thiol group containing amino acids have proved to be excellent stabilisers, with L-cysteine becoming one of the popular surface capping molecules for CdX (X ¼ S, Se, and Te) nanoparticles. 18,[25][26][27][28][29][30][31] In addition this use of stereospecific chiral stabilising molecules opened another avenue of interest in the area of quantum dot research, as chirality is a key factor in biological and biochemical interactions. Due to their unique photophysical properties, we believe that chiral QDs have a range of potential applications in photonics and biochemistry. 13,32,33 The main aim of our work is to develop novel chiral CdSe based QDs by using chiral stabilisers and to investigate the properties of these materials. Here we report the synthesis and detailed spectroscopic studies of new penicillamine stabilised CdSe QDs, which have been prepared using the dextrorota...

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“…Therefore chiral nanoparticles have been envisaged to play an important role in science and technology. 14,15 In particular CD active luminescent nanoparticles have a great potential for the development of new chiral nanosensors.Over last years there have also been several reports on semiconductor nanomaterials with tetrapodal morphology. These amazing nanostructures have been of great interest due to their potential use in photovoltaics, 16 in the synthesis of asymmetric nano-assemblies 17 as well as prospective additives for polymer reinforcement.…”

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Chiral luminescent CdS nano-tetrapods

et al. 2010

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The utilisation of chiral penicillamine stabilisers allowed the preparation of new water soluble white emitting CdS nano-tetrapods, which demonstrated circular dichroism in the band-edge region of the spectrum.Semiconductor nanocrystals or quantum dots are remarkable for their size dependent optical and photonic properties, which differ significantly from the bulk material. These unique properties are of great interest for a number of potential applications including biomedical imaging, 1-4 sensing, 5 light-emitting diodes (LEDs), 6 photovoltaics 7 and displays. 8Previously the preparation of new chiral quantum dots which demonstrate circular dichroism (CD) activity was achieved by the microwave synthesis in the presence of the chiral penicillamine stabiliser. 9 In this case the formation of chiral defects in the nanocrystals structure leads both to the defect emission and CD response. 10 More recent reports on chiral CdTe based nanoparticles have also been published. 11,12 There is also a very recent theoretical work, which demonstrated that the electric field of the metal or semiconductor nanoparticle enhances the signal from the chiral stabiliser and other chiral species.13 Chirality is a common occurrence in the natural world and chiral compounds have very important applications in chemistry, biology, pharmacology and medicine. Therefore chiral nanoparticles have been envisaged to play an important role in science and technology. 14,15 In particular CD active luminescent nanoparticles have a great potential for the development of new chiral nanosensors.Over last years there have also been several reports on semiconductor nanomaterials with tetrapodal morphology. These amazing nanostructures have been of great interest due to their potential use in photovoltaics, 16 in the synthesis of asymmetric nano-assemblies 17 as well as prospective additives for polymer reinforcement.18 These materials have also displayed anisotropic emission 19 as a direct result of their morphology. Normally the synthesis of nanotetrapods 18,[20][21][22][23][24][25][26][27][28][29] involves the use of high temperature organic phase reactions or the utilisation of solvothermal approach. The mechanism proposed for the formation of these structures 23 engages the generation of seed nanocrystals that subsequently act as sites for preferential growth of the arms. Evidence for this mechanism may be found in the production of heterostructures using prepared pre-formed seed of one material followed by the use of additional materials to grow the arms. 28,30Here we report new chiral CdS nanotetrapods, which have been produced by heating of a basic aqueous solution of CdCl 2 , thioacetamide and racemic (Rac), D-or L-enantiomeric forms of penicillamine (Pen) under reflux.z Samples of the products have been diluted and examined using UV-VIS and photoluminescence (PL) spectroscopy to analyse the absorbance and emission characteristics of the samples. The absorbance spectra show a defined band edge at approximately 370 nm for both enantiomers of the...

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Chiral nanoscale building blocks—from understanding to applications

Cited by 76 publications

References 46 publications

Bottom-up assembly of photonic crystals

Bottom-up assembly of photonic crystals

Synthesis and spectroscopic studies of chiral CdSe quantum dots

Chiral luminescent CdS nano-tetrapods

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