CdS and ZnS quantum dots embedded in hyaluronic acid films

Khachatryan, Gohar; Khachatryan, Karen; Stobiński, Leszek; Tomasik, Piotr; Fiedorowicz, Maciej; Lin, Hsin-Fu

doi:10.1016/j.jallcom.2009.03.011

Cited by 18 publications

(10 citation statements)

References 66 publications

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“…CdS nanoparticles produced by this Antarctic strain showed a zeta potential value (lower than −20 mV) indicative of high stability in aqueous solutions, with nanocrystals produced with Met being the most stable (Kuznetsova and Rempel, 2015). The average size of the nanoparticles produced with Cys (∼2 nm) and Met (∼16 nm), determined from TEM images, were consistent with the size of QDs biosynthesized by other microorganisms (Chen et al, 2009; Khachatryan et al, 2009; Syed and Ahmad, 2013; Wu et al, 2015; Al-Shalabi and Doran, 2016; Tandon and Vats, 2016; Wang et al, 2018; Bruna et al, 2019). TEM as a technique for characterizing nanomaterials enables the visualization of the shape and size of the nanoparticles by providing direct images of nanomaterials at a spatial resolution (Lina et al, 2014).…”

Section: Discussionsupporting

confidence: 75%

Biosynthesis of CdS Quantum Dots Mediated by Volatile Sulfur Compounds Released by Antarctic Pseudomonas fragi

et al. 2019

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Previously we reported the biosynthesis of intracellular cadmium sulfide quantum dots (CdS QDs) at low temperatures by the Antarctic strain Pseudomonas fragi GC01. Here we studied the role of volatile sulfur compounds (VSCs) in the biosynthesis of CdS QDs by P. fragi GC01. The biosynthesis of nanoparticles was evaluated in the presence of sulfate, sulfite, thiosulfate, sulfide, cysteine and methionine as sole sulfur sources. Intracellular biosynthesis occurred with all sulfur sources tested. However, extracellular biosynthesis was observed only in cultures amended with cysteine (Cys) and methionine (Met). Extracellular nanoparticles were characterized by dynamic light scattering, absorption and emission spectra, energy dispersive X-ray, atomic force microscopy, transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. Purified QDs correspond to cubic nanocrystals of CdS with sizes between 2 and 16 nm. The analysis of VSCs revealed that P. fragi GC01 produced hydrogen sulfide (H 2 S), methanethiol (MeSH) and dimethyl sulfide (DMS) in the presence of sulfate, Met or Cys. Dimethyl disulfide (DMDS) was only detected in the presence of Met. Interestingly, MeSH was the main VSC produced in this condition. In addition, MeSH was the only VSC for which the concentration decreased in the presence of cadmium (Cd) of all the sulfur sources tested, suggesting that this gas interacts with Cd to form nanoparticles. The role of MeSH and DMS on Cds QDs biosynthesis was evaluated in two mutants of the Antarctic strain Pseudomonas deceptionensis M1 T : megL – (unable to produce MeSH from Met) and mddA – (unable to generate DMS from MeSH). No biosynthesis of QDs was observed in the megL – strain, confirming the importance of MeSH in QD biosynthesis. In addition, the production of QDs in the mddA – strain was not affected, indicating that DMS is not a substrate for the biosynthesis of nanoparticles. Here, we confirm a link between MeSH production and CdS QDs biosynthesis when Met is used as sole sulfur source. This work represents the first report that directly associates the production of MeSH with the bacterial synthesis of QDs, thus revealing the importance of different VSCs in the biological generation of metal sulfide nanostructures.

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Section: Discussionsupporting

confidence: 75%

Biosynthesis of CdS Quantum Dots Mediated by Volatile Sulfur Compounds Released by Antarctic Pseudomonas fragi

et al. 2019

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“…The TEM microscopy showed metal sulfides under study embedded in the TS matrix as 3 -10 nm nanocrystals with a low tendency for agglomeration (Figure 1). This result confirmed our observation that nonanionic polysaccharides were superior matrices for generation of nanocrystals of metallic [45] and QDs [42] [43] particles.…”

Section: Resultssupporting

confidence: 91%

Synthesis of ZnS, CdS and Core-Shell Mixed CdS/ZnS, ZnS/CdS Nanocrystals in Tapioca Starch Matrix

Khachatryan¹,

Khachatryan²,

Fiedorowicz³

2015

MSCE

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Gel of tapioca starch (TS) is a suitable matrix for the formation of ZnS, CdS and core-shell ZnS/CdS as well as CdS/ZnS quantum dots (QDs). These QDs reside in the matrix as non-agglomerating 3-10 nm nanocrystals. It is demonstrated that amylopectin is responsible for the QDs formation rather than amylose. Combination of ZnS with CdS in the core-shell QDs results in the increase in the intensity of emission without any shift of its wavelength.

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“…5. The different emission bands due to MnS (416, 435 nm), ZnS (413, 440 nm) and CdS (451, 469 nm) were clearly seen at around 413-469 nm for all of the hybrids (Denzler et al, 1998;Hassan and Ali, 2008;Khachatryan et al, 2009). The appearance of the overlapped luminescence bands (at 413,416,435,Fig.…”

Section: Resultsmentioning

confidence: 91%

Preparation of metal sulfide mixtures in montmorillonite by solid–solid reactions

Kabilaphat¹,

Khaorapapong²,

Saito

et al. 2015

Applied Clay Science

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CdS and ZnS quantum dots embedded in hyaluronic acid films

Cited by 18 publications

References 66 publications

Biosynthesis of CdS Quantum Dots Mediated by Volatile Sulfur Compounds Released by Antarctic Pseudomonas fragi

Biosynthesis of CdS Quantum Dots Mediated by Volatile Sulfur Compounds Released by Antarctic Pseudomonas fragi

Synthesis of ZnS, CdS and Core-Shell Mixed CdS/ZnS, ZnS/CdS Nanocrystals in Tapioca Starch Matrix

Preparation of metal sulfide mixtures in montmorillonite by solid–solid reactions

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