An eco-friendly physicocultural-based rapid synthesis of selenium nanoparticles

Shirsat, Shubhangi D.; Kadam, Ambadas S.; Jadhav, Vijaykumar V.; Zate, Manohar K.; Naushad, Mu.; Pawar, B.N.; Mane, Rajaram S.; Kim, Kwang Ho

doi:10.1039/c6ra08275k

Cited by 13 publications

(6 citation statements)

References 31 publications

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“…2i), probably because of the surface oxidation of ZnSe nanorods. Indeed, ZnSe oxidation was observed in 24 h in aerobic conditions, manifested in the solution becoming reddish due to the formation of selenium oxyanions etched off from the rod 27 . Meanwhile, ZnSe/ZnS core/islands-shell nanorods maintained its stability and high photo-initiation capability in aerobic conditions.…”

Section: Resultsmentioning

confidence: 99%

Strain-controlled shell morphology on quantum rods

et al. 2019

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Semiconductor heterostructure nanocrystals, especially with core/shell architectures, are important for numerous applications. Here we show that by decreasing the shell growth rate the morphology of ZnS shells on ZnSe quantum rods can be tuned from flat to islands-like, which decreases the interfacial strain energy. Further reduced growth speed, approaching the thermodynamic limit, leads to coherent shell growth forming unique helical-shell morphology. This reveals a template-free mechanism for induced chirality at the nanoscale. The helical morphology minimizes the sum of the strain and surface energy and maintains band gap emission due to its coherent core/shell interface without traps, unlike the other morphologies. Reaching the thermodynamic controlled growth regime for colloidal semiconductor core/shell nanocrystals thus offers morphologies with clear impact on their applicative potential.

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Section: Resultsmentioning

confidence: 99%

Strain-controlled shell morphology on quantum rods

et al. 2019

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“…However, ZnSe nanorods kept in water under aerobic conditions were found to degrade with time. This was first seen by the appearance of an absorption feature at ∼600 nm, which is attributed to free selenium (Figure S3), and eventually, all absorption features of the NRs disappear (Figure a). In contrast, keeping NRs under anaerobic conditions maintained their absorption features.…”

Section: Resultsmentioning

confidence: 96%

“…Photocatalytic experiments with such systems indeed showed great potential . Yet, surface selenium anions are known to have photochemical sensitivity and can be readily oxidized creating defects that eventually lead to degradation of the nanorods . ZnS shell growth was previously shown to enhance the nanoparticles’ stability under ambient conditions .…”

Section: Introductionmentioning

confidence: 99%

Shell Stabilization of Photocatalytic ZnSe Nanorods

et al. 2019

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Zinc chalcogenides nanostructures are promising newly-studied materials for photocatalytic reactions such as water reduction for hydrogen generation and photoinitiation of radical polymerization processes. Herein, we introduced a straightforward synthesis of thin ZnS shell on ZnSe nanorods and characterized the resulting core/shell ZnSe/ZnS nanorods by electron microscopy techniques and X-ray photoelectron spectroscopy. Then, the photocatalytic activities of the nanorods were studied by gas chromatography for hydrogen generation and by Fourier transform infrared spectroscopy for the photoinitiation capability. While such core/shell systems may limit charge transfer to the solution due to the type-I band alignment, we find that the photochemical stability and photocatalytic activity of this system is significantly enhanced over pristine ZnSe nanorods. ZnSe/ZnS nanorods with Ni(NO 3 ) 2 co-catalyst are used for hydrogen generation and the effects of the nanorods' surface coating, pH conditions and type of hole scavenger are examined. The best performances were observed for nanorods after ligand stripping with Meerwein's reagent using ascorbic acid as a hole acceptor at pH 4.5. All three parameters were found to affect the photocatalytic activity. Yet, the surface coating and pH dependence differ from previous reports on cadmium chalcogenides photocatalysts. The origin of their differences is discussed and attributed to the band alignment of the systems and the nature of the co-catalyst. The stable heavy-metal free ZnSe/ZnS nanorods system presented here holds promise for various photocatalytic applications.

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“…Quantum dots synthesis of Providencia vermicola BGRW culture in terms of color intensity were examined at different temperature (10-60°C). The increase in the color intensity of culture was due to increased number of quantum dots formed (Shirsat et al, 2016). In addition, the increase in fluorescence intensity under UV-lamp of culture was due to increasing number of CdSe QDs (Ayano et al, 2014).…”

Section: The Effect Of Temperature On Cdse Qds Formationmentioning

confidence: 99%

Biosynthesis of cadmium selenide quantum dots by Providencia vermicola

Abou-assy¹,

El-Deeb²,

Altalhi³

et al. 2019

Afr. J. Microbiol. Res.

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Cadmium selenide quantum dots (CdSe QDs) were synthesized by using Providencia vermicola BGRW, which has discriminatory ability to resist many metals such as Selenium, Cadmium, Silver, Zinc, Copper, Lead, Nickel, Cobalt and Bismuth metals. BGRW was able to grow in the presence of 6 mM of CdCl 2. The best conditions for extra/intracellular CdSe QDs synthesis were 0.1 mM SeO 2 : 0.9 mM CdCl 2 , 37°C, pH 9 within 24 h. The biosynthesis of CdSe QDs was monitored by UV-Visible spectrum that showed surface plasmon resonance (SPR) peaks at 388 nm. Depending on fluorescence property of quantum dots, photoluminescence characteristics of the biogenic CdSe QDs were at 385 nm. Further characterization of synthesized CdSe QDs was carried out using the X-ray Diffraction (XRD), Transmission Electron Microscope (TEM) and Fourier Transform Infrared (FTIR) spectroscopy. TEM and XRD analysis revealed that CdSe QDs was cubic in shape with a size range of ∼2 to 4 nm. EDS analysis confirmed the composition of QDs from cadmium and selenium ions. FTIR spectroscopy confirmed the presence of proteins as the stabilizing agent surrounding the quantum dots.

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An eco-friendly physicocultural-based rapid synthesis of selenium nanoparticles

Abstract: A rapid synthesis of stable and smaller sized Se NPs was achieved in tryptic soya medium maintained at pH ∼9, temperature ∼50 °C, and a 9 mM Se oxyion concentration.

Cited by 13 publications

References 31 publications

Strain-controlled shell morphology on quantum rods

Strain-controlled shell morphology on quantum rods

Shell Stabilization of Photocatalytic ZnSe Nanorods

Biosynthesis of cadmium selenide quantum dots by Providencia vermicola

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