The dose-dependent photobleaching of CdTe quantum dots in aqueous media

Kalnaitytė, Agnė; Bagdonas, Saulius; Rotomskis, Ričardas

doi:10.1016/j.jlumin.2018.05.028

Cited by 12 publications

(3 citation statements)

References 64 publications

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“…External factors such as corrosive medium or prolonged exposure to light can affect the structural stability of QDs, which plays a key role in their toxicity caused by HMs leakage. It has been shown that the spectral properties of negatively charged CdTe-MSA core QDs undergo gradual changes when exposed to different doses of light in distilled water ( Kalnaitytė, Bagdonas & Rotomskis, 2018 ). Similarly, the decrease of the PL intensity in acidic conditions can be explained by the detachment of the surface ligands, which give rise to defect states that lay within the band gap and reduced the quantum yield by providing alternative pathways of excited-state relaxation ( Aldana et al, 2005 ).…”

Section: Discussionmentioning

confidence: 99%

Interactions of semiconductor Cd-based quantum dots and Cd²⁺ with gut bacteria isolated from wild Salmo trutta fry

Butrimienė

Kalnaitytė

Januškaitė

et al. 2022

PeerJ

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Background With the rapid development of nanotechnology, more and more nanoproducts are being released into the environment where they may both pose ecological risks and be toxic to living organisms. The ecotoxicological impact of quantum dots (QDs), a class of nanoparticles (NPs), on aquatic organisms is becoming an emerging issue, this due to their nano-specific properties, to the physico-chemical transformation in the environment and to the possible release of toxic metals from their structure such as Cd. Methods In this work, (i) spectroscopic measurements of commercially available Cd-based QDs (CdSe/ZnS-COOH) were made at various pH values (5.0 and 7.0) to study their interactions (at a concentration of 4 nm) with various strains of Gram-positive and Gram-negative gut bacteria after short-term exposure and (ii) the antibacterial efficacy of QDs and Cd 2+ (at a concentration 0.09–3.56 mM) against gut bacteria isolated from wild freshwater Salmo trutta fry was studied at different temperatures (15 °C and 25 °C) and pH values (5.0 and 7.0) by applying a well-established disc diffusion assay. Results Twenty-six gut bacterial isolates from wild Salmo trutta fry were identified as Aeromonas spp., A. popoffii , A. salmonicida , A. sobria , Carnobacterium maltaromaticum , Buttiauxella sp., Listeria sp., Microbacterium sp., Shewanella putrefaciens and Serratia sp. Cd-based (CdSe/ZnS-COOH) QDs at a concentration of 4 nm were found to be stable in aqueous media (with pH 7.0) or starting to form aggregates (at pH 5.0), thus, apparently, did not release heavy metals (HMs) into the media over 48 h in conditions of light or dark and did not show antibacterial efficacy on the gut bacteria isolated from wild Salmo trutta fry after short-term (9 h and 48 h) incubations. Cd 2+ was found to produce significant dose-dependent toxic effects on bacterial growth, and the size of the inhibition zones on some of the tested strains significantly correlated with temperature. The most sensitive and the most resistant to Cd 2+ were the Gram-positive bacteria, for which the minimum inhibitory concentration (MIC) values of Cd 2+ were 0.09–0.27 mM and 3.11–3.29 mM respectively and varied significantly between the tested temperatures (15 °C and 25 °C). The MIC values of Cd 2+ for the Gram-negative bacteria (18 out of 22 strains) ranged from 0.44 to 0.71 mM and did not differ significantly between the tested temperatures. Among the selected Gram-positive and Gram-negative strains, those wit...

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Section: Discussionmentioning

confidence: 99%

Interactions of semiconductor Cd-based quantum dots and Cd²⁺ with gut bacteria isolated from wild Salmo trutta fry

Butrimienė

Kalnaitytė

Januškaitė

et al. 2022

PeerJ

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“…For instance, the degree of reduction in PL intensity induced by light and media depends on both a higher irradiation dose and a lower QDs concentration. 35 Proper assessment of toxicity of NPs on algae cells also requires estimating the mutual effects of NPs and other medium components. 34,36 Therefore, before determining the effects of CdSe/ZnS-COOH QDs on D. communis, the photostability of the QDs was monitored in the natural algae cultivation media Balsys and DWW and the artificial media MWC.…”

Section: Stability Of Qds In Media With Microalgaementioning

confidence: 99%

The effects of CdSe/ZnS quantum dots on autofluorescence properties and growth of algae Desmodesmus communis: dependence on cultivation medium

Kalnaitytė-Vengelienė,

Montvydienė,

Januškaitė

et al. 2024

Environ. Sci.: Nano

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“…Cadmium compounds such as cadmium zinc telluride (CdZnTe) and cadmium telluride (CdTe) showing good detection efficiency and high energy resolution, demonstrate themselves as attractive detection materials in many applications for detecting x-ray and gamma radiation at room temperature, such as medical and industrial images, industrial measurements and non-destructive testing, safety and monitoring, nuclear safeguards and nonproliferation, as well as astrophysics. [1][2][3][4] Cadmium iodide (CdI 2 ) crystals are long known for their descent scintillating properties which have been extensively studied by spectroscopic techniques. [5][6][7][8][9][10][11][12] Comparing it with other scintillators and phosphors [13][14][15][16][17][18][19][20][21] it shows comparable detector characteristics in some parameters, and therefore it is still of interest, especially when considering its improvement by doping.…”

Section: Introductionmentioning

confidence: 99%

Low-temperature luminescence of CdI2 under synchrotron radiation

Karbovnyk

Pankratov

Velgosh

et al. 2020

Low Temperature Physics

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Synchrotron radiation is applied to study visible and UV luminescence spectra and their excitation spectra of undoped as well as In and Sb doped cadmium iodide crystals at 10 K. The origin of principal luminescence bands and the role of impurities in the formation of emission centers are discussed. The luminescence properties have been explained based on the electronic structure of CdI 2 crystals.

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The dose-dependent photobleaching of CdTe quantum dots in aqueous media

Cited by 12 publications

References 64 publications

Interactions of semiconductor Cd-based quantum dots and Cd²⁺ with gut bacteria isolated from wild Salmo trutta fry

Interactions of semiconductor Cd-based quantum dots and Cd²⁺ with gut bacteria isolated from wild Salmo trutta fry

The effects of CdSe/ZnS quantum dots on autofluorescence properties and growth of algae Desmodesmus communis: dependence on cultivation medium

Low-temperature luminescence of CdI2 under synchrotron radiation

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The dose-dependent photobleaching of CdTe quantum dots in aqueous media

Cited by 12 publications

References 64 publications

Interactions of semiconductor Cd-based quantum dots and Cd2+ with gut bacteria isolated from wild Salmo trutta fry

Interactions of semiconductor Cd-based quantum dots and Cd2+ with gut bacteria isolated from wild Salmo trutta fry

The effects of CdSe/ZnS quantum dots on autofluorescence properties and growth of algae Desmodesmus communis: dependence on cultivation medium

Low-temperature luminescence of CdI2 under synchrotron radiation

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Interactions of semiconductor Cd-based quantum dots and Cd²⁺ with gut bacteria isolated from wild Salmo trutta fry

Interactions of semiconductor Cd-based quantum dots and Cd²⁺ with gut bacteria isolated from wild Salmo trutta fry