Surface-treated biocompatible ZnS quantum dots: Synthesis, photo-physical and microstructural properties

Taherian, M.; Alvani, Ali Asghar Sabbagh; Shokrgozar, Mohammad Ali; Salimi, R.; Moosakhani, Shima; Sameie, H.; Tabatabaee, F.

doi:10.1007/s13391-013-3211-2

Cited by 18 publications

(12 citation statements)

References 49 publications

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“…This latter was also evidencing Zn-S vibrations of the ZnS nanocrystals. A similar spectroscopic evidence is reported as a proof of successful functionalisation also in the paper of Taherian, where the S-H vibration of the thiol ligands glutathione and thioglycolic acid at 2550-2670 cm −1 is not observed anymore upon capping of the ZnS nanoparticles [396], therefore indicating successful anchoring of the ligand. In this study, the effect of ligand chemistry on the microstructural properties and photo-physical properties, in particular the UV absorption is discussed.…”

Section: Zinc Sulphidesupporting

confidence: 81%

Functionalisation of Colloidal Transition Metal Sulphides Nanocrystals: A Fascinating and Challenging Playground for the Chemist

2017

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Abstract:Metal sulphides, and in particular transition metal sulphide colloids, are a broad, versatile and exciting class of inorganic compounds which deserve growing interest and attention ascribable to the functional properties that many of them display. With respect to their oxide homologues, however, they are characterised by noticeably different chemical, structural and hence functional features. Their potential applications span several fields, and in many of the foreseen applications (e.g., in bioimaging and related fields), the achievement of stable colloidal suspensions of metal sulphides is highly desirable or either an unavoidable requirement to be met. To this aim, robust functionalisation strategies should be devised, which however are, with respect to metal or metal oxides colloids, much more challenging. This has to be ascribed, inter alia, also to the still limited knowledge of the sulphides surface chemistry, particularly when comparing it to the better established, though multifaceted, oxide surface chemistry. A ground-breaking endeavour in this field is hence the detailed understanding of the nature of the complex surface chemistry of transition metal sulphides, which ideally requires an integrated experimental and modelling approach. In this review, an overview of the state-of-the-art on the existing examples of functionalisation of transition metal sulphides is provided, also by focusing on selected case studies, exemplifying the manifold nature of this class of binary inorganic compounds.

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Section: Zinc Sulphidesupporting

confidence: 81%

Functionalisation of Colloidal Transition Metal Sulphides Nanocrystals: A Fascinating and Challenging Playground for the Chemist

2017

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“…In the same way, the levels associated with the zinc vacancies should be located far more to the valence band edge than those of sulfur vacancies to the conduction band edge [58]. As evident from Fig.…”

Section: Figure 2 Pl Spectra and The Pl Relative Intensities (Inset)mentioning

confidence: 71%

Self-organization of an optomagnetic CoFe₂O₄–ZnS nanocomposite: preparation and characterization

et al. 2015

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We report an advanced method for the self-organization of an optomagnetic nanocomposite composed of both fluorescent clusters (ZnS quantum dots, QDs) and magnetic nanoparticles (CoFe2O4). ZnS nanocrystals were prepared via an aqueous method at different temperatures (25, 50, 75, and 100 °C). Their structural, optical and chemical properties were comprehensively characterized by X-ray diffraction (XRD), UV-Vis, photoluminescence (PL) spectroscopy, scanning electron microscopy (SEM), dynamic light scattering (DLS), transmission electron microscopy (TEM), and infrared spectroscopy (FT-IR). The highest PL intensity was observed for the cubic ZnS nanoparticles synthesized at 75 °C which were then stabilized electrosterically using thioglycolic acid. The photophysical analysis of the capped QDs with particle size in the range 9-25 nm revealed that the emission intensity increases and the optical band gap rises compared to uncapped nanocrystals (3.88 to 4.02 eV). These band gaps are both wider than that of bulk ZnS resulting from the quantum confinement effect. Magnetic nanoparticles were synthesized via a coprecipitation route and a sol-gel process was used to form the functionalized, silica-coated CoFe2O4. Finally, thiol coordination was used for binding the QDs to the surface of the magnetic nanoparticles. The fluorescence intensity and magnetic properties of the nanocomposites are related to the ratio of ZnS and CoFe2O4. As-prepared optomagnetic nanocomposite with small size (12-45 nm), acceptable saturation magnetization (about 6.7 emu/g), and satisfactory luminescent characteristics could be successfully prepared. These are promising candidates for biological and photocatalytic applications.

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“…This bluish green emission band centered on 494 nm can have originated from the vacancies and interstitial defects on the surface of ZnS such as the recombination of trapped electrons on the sulfur vacancy donor level (Vs) to interstitial sulfur states (Is). 56,57 With the increase in Ag incorporation from 0 wt. % to 10 wt.…”

Section: G Photoluminescence Analysismentioning

confidence: 99%

Surface plasmon resonance in nanostructured Ag incorporated ZnS films

2015

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Silver incorporated zinc sulfide thin films are prepared by RF magnetron sputtering technique and the influence of silver incorporation on the structural, optical and luminescence properties is analyzed using techniques like grazing incidence X-Ray diffraction (GIXRD), atomic force microscopy (AFM), field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDS), micro-Raman spectroscopy, UV-Vis spectroscopy and laser photoluminescence spectroscopy. XRD analysis presents hexagonal wurtzite structure for the films. A reduction of crystallinity of the films is observed due to Ag incorporation. The Raman spectral analysis confirms the reduction of crystallinity and increase of strain due to the Ag incorporation. AFM analysis reveals a rough surface morphology for the undoped film and Ag incorporation makes the films uniform, dense and smooth. A blue shift of band gap energy with increase in Ag incorporation is observed due to quantum confinement effect. An absorption band (450-650 nm region) due to surface plasmon resonance of the Ag clusters present in the ZnS matrix is observed for the samples with higher Ag incorporation. The complex dielectric constant, loss factor and distribution of volume and surface energy loss of the ZnS thin films are calculated. Laser photoluminescence measurements gives an intense bluish green emission from the ZnS films and a quenching of the PL emission is observed which can be due to the metal plasmonic absorption and non-radiative energy transfer due to Ag incorporation. C 2015 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License. [http://dx

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Surface-treated biocompatible ZnS quantum dots: Synthesis, photo-physical and microstructural properties

Cited by 18 publications

References 49 publications

Functionalisation of Colloidal Transition Metal Sulphides Nanocrystals: A Fascinating and Challenging Playground for the Chemist

Functionalisation of Colloidal Transition Metal Sulphides Nanocrystals: A Fascinating and Challenging Playground for the Chemist

Self-organization of an optomagnetic CoFe₂O₄–ZnS nanocomposite: preparation and characterization

Surface plasmon resonance in nanostructured Ag incorporated ZnS films

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Surface-treated biocompatible ZnS quantum dots: Synthesis, photo-physical and microstructural properties

Cited by 18 publications

References 49 publications

Functionalisation of Colloidal Transition Metal Sulphides Nanocrystals: A Fascinating and Challenging Playground for the Chemist

Functionalisation of Colloidal Transition Metal Sulphides Nanocrystals: A Fascinating and Challenging Playground for the Chemist

Self-organization of an optomagnetic CoFe2O4–ZnS nanocomposite: preparation and characterization

Surface plasmon resonance in nanostructured Ag incorporated ZnS films

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Self-organization of an optomagnetic CoFe₂O₄–ZnS nanocomposite: preparation and characterization