Influence of the dispersion medium on the properties of CdTe micro- and nanocrystals in a colloidal solution

Kapush, O.A.; Budzulyak, S. I.; Korbutyak, D. V.; Vakhnyak, N. D.; Boruk, S. D.; Dzhagan, Volodymyr; Yemets, А. І.; Valakh, M. Ya.

doi:10.15407/fm26.01.27

Cited by 4 publications

(4 citation statements)

References 43 publications

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“…CdI 2 , NaOH, and thioglycolic acid (TGA ≥90 %) were purchased from Himlaborreactive (Ukraine). CdTe QDs were synthesized by means of colloidal chemistry, following the protocol described by us previously (Kapush et al 2019). Briefly, the low-temperature colloidal synthesis was performed in the reactor with complete mixing and in the presence of TGA as a stabilizer.…”

Section: Nanomaterialsmentioning

confidence: 99%

“…The CdTe precursors formed at this stage were subsequently converted into CdTe QDs after heating the solution at 100 °C. Within the given synthesis route (Kapush et al 2019), the NCs of different size can be obtained by varying the magnitude of the electrical current flowing through the electrochemical cell in which the synthesis of the NCs took place. In particular, by changing the current from 0.1 to 0.5 A, a series of samples with the average NC size of 3 nm to 4 nm could be obtained, as estimated from the photoluminescence spectra in Fig.…”

Section: Nanomaterialsmentioning

confidence: 99%

See 1 more Smart Citation

Phytotoxic effects of CdTe quantum dots on root meristems of Allium cepa L.

Smirnov

Kovalenko²,

Karpets³

et al. 2021

Nova Biotechnol. Chim.

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The effect of solutions of cadmium telluride quantum dots (CdTe QD) as powerful cytotoxic effectors was investigated using a standard Allium cepa L. test system. The diameters of synthesized CdTe QD derived from the optical data varied within 3 – 4 nm. Toxicity of experimental solutions of CdTe QD at the organism level were evaluated by measuring biomass growth of onion roots and cytotoxic influence was estimated based on proliferative activity of root meristem cells. All of CdTe QD experimental solutions in concentration 10 µM significantly inhibited the growth of Allium cepa L. roots, proliferative activity, and total dehydrogenase activity. Relation between the QDs size and their phytotoxicity was not found. However, the highest inhibiting impact was for QDs solution with a nanocrystals size of 3.5 nm. Their ability to penetrate into cells and interact with their intracellular components may cause inhibiting mitosis without fixed clastogenic and aneugenic effects. Solutions of CdTe QD at a given concentration can be considered as potent cytostatic agents for plant cells with antimitotic properties.

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Section: Nanomaterialsmentioning

confidence: 99%

Section: Nanomaterialsmentioning

confidence: 99%

Phytotoxic effects of CdTe quantum dots on root meristems of Allium cepa L.

Smirnov

Kovalenko²,

Karpets³

et al. 2021

Nova Biotechnol. Chim.

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“…In this work, we studied the effect of colloidal Au NPs on the PL spectra of colloidal QDs synthesized at mild conditions in aqueous solutions, using thioglycolic acid as a stabilizer [22][23][24]. We observe that the PL intensity can be enhanced or reduced depending on the relative spectral position of the QD PL and LSPR band of Au NPs, as well as on the kind of dispersion medium (solvent) and the presence of additional stabilizers, such as polymers.…”

Section: Introductionmentioning

confidence: 99%

“…The PL spectra of QDs can contain not only the narrow and tunable excitonic (interband) PL band, which is valuable for applications but also a broad band related to surface states, which compete with excitonic recombination and are regarded as a drawback for most QD application [21]. The advantage of CdTe QDs is the absence or negligible intensity of this defect-related band, even for QDs obtained at low-temperature and other mild conditions, in particular at room-temperature colloidal synthesis in aqueous media [22][23][24][25]. This fact is an additional motivation for the investigation of CdTe QDs for optical and optoelectronic applications.…”

Section: Introductionmentioning

confidence: 99%

Tuning the photoluminescence of CdTe quantum dots by controllable coupling to plasmonic Au nanoparticles

Dzhagan

Kapush

Isaeva

et al. 2022

Phys. Chem. Solid St.

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A controllable variation of the photoluminescence (PL) intensity of semiconductor quantum dots (QDs) via their coupling to plasmonic nanoparticles (NPs) is the potential basis for optoelectronic and sensing applications. In this work, the effect of Au NPs on the PL of colloidal CdTe QDs is investigated in solution and solid films. An PL enhancement for the QDs synthesized in water was observed in case of spectral overlap of the plasmon absorption band of and QD PL band. In case of Au NPs synthesized in dimethyl sulfoxyl the trend is to reduction of the PL intensity. For the reference samples prepared by mixing QDs not with Au NP solutions but with corresponding pure solvent, certain PL enhancement was observed and presumably attributed to reduction of self-absorption or non-radiative interparticle interaction in less concentrated QD solution. However, the contribution of this dilution-related enhancement is expected to be independent of the spectral properties of NPs and QDs. Therefore, the observed in this work different behavior of QD PL in certain combinations of QDs and NPs is attributed to interaction between electronic excitation in the QD and plasmon.

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