Synthesis Of Se Nanoparticles Research Articles

Biogenesis of selenium nanospheres using Halomonas venusta strain GUSDM4 exhibiting potent environmental applications.

Selenite reducing bacterial strain (GUSDM4) isolated from Mandovi estuary of Goa, India was identified as Halomonas venusta based on 16S rRNA gene sequence analysis. Its maximum tolerance level for sodium selenite (Na2SeO3) was 100mM. The 2, 3-diaminonaphthalene-based spectroscopic analysis demonstrated 96 and 93% reduction of 2 and 4mM Na2SeO3 respectively to elemental selenium (Se0) during the late stationary growth phase. Biosynthesis of Se nanoparticles (SeNPs) commenced within 4h during the log phase, which was evident from the brick red color in the growth medium and a characteristic peak at 265nm revealed by UV-Vis spectrophotometry. The intracellular periplasmic synthesis of SeNPs in GUSDM4 was confirmed by transmission electron microscopy (TEM). Characterization of SeNPs by X-ray crystallography, TEM and energy-dispersive X-ray analysis(EDAX) clearly demonstrated spherical SeNPs of 20-80nm diameter with hexagonal crystal lattice. SeNPs (0.8 and 1mg/L) primed seeds under arsenate [As(V)] stress showed increase in shoot length, root length and biomass by 1.4-, 1.5- and 1.1-fold respectively, as compared to As(V) primed seeds alone. The proline and phenolic content in seeds primed with SeNPs under arsenate stress showed alleviated levels proving its ameliorative potential. SeNPs also demonstrated anti-biofilm activity at 20µg/mL against human pathogens which was evident by scanning electron microscopic (SEM) analysis. SeNPs interestingly revealed mosquito larvicidal activity also. Therefore, these studies have clearly demonstrated amazing potential of the marine bacterium, Halomonas venusta in biosynthesis of SeNPs and their applications as ameliorative, anti-biofilm and mosquito larvicidal agents which is the first report of its kind.

Reductant-free synthesis of Se micro/nanostructures with different morphologies from SeCl4 via a simple hydrothermal approach and its photovoltaic application

Herein, three-dimensional selenium (Se) nanostructures were successfully synthesized via a simple hydrothermal route without using any reducing agent for the first time. SeCl4 as Se source and CTAB as surfactant were employed. The as-synthesized products were extensively characterized by techniques such as X-ray diffraction, Energy dispersive spectrometry, Scanning electron microscopy, Transmission electron microscope, Fourier transform infrared spectroscopy and Diffused reflectance UV–visible spectrum. Our results showed that with using no reluctant in this hydrothermal condition, Se(IV) can be completely reduced to Se0. Effect of temperature, surfactant, time, solvent and pH on final products morphologies and particles size were investigated. The findings revealed that the noted parameters have great effect on morphology and quality of final products. To fabricate a FTO/TiO2/Se/Pt-FTO solar cell, selenium film was directly deposited on top of the TiO2 by Doctor’s blade method. Solar cell results indicate that an inexpensive solar cell could be developed by synthesis of Se nanoparticles through hydrothermal method.

Facile microwave synthesis, characterization, and solar cell application of selenium nanoparticles

In the current study, selenium (Se) nanoparticles with hexagonal phase were synthesized by applying microwave irradiation using selenium tetrachloride as a starting reagent in distilled water at various conditions. Se nanoparticles were formed using hydrazine in short reaction time (4min). The effects of reaction time, irradiation power, and types of surfactant including sodium dodecyl sulfate (SDS), polyethylene glycol 600 (PEG 600), and cetyltrimethylammonium bromide (CTAB) on the particle size of the product were investigated. To fabricate a FTO/TiO2/Se/Pt-FTO and FTO/Se/CdS/Pt-FTO solar cell, selenium film was directly deposited on top of the TiO2 and FTO glass prepared by Doctor’s blade method, respectively. Solar cell results indicate that an inexpensive solar cell could be developed by synthesis of Se nanoparticles through microwave method.

Synthesis of Se nanoparticles by using TSA ion and its photocatalytic application for decolorization of cango red under UV irradiation

In this study, we describe a size-controlled synthesis of selenium nanoparticles based on the reduction of selenious acid (H 2SeO 3) by UV-irradiated tungstosilicate acid (H 4SiW 12O 40, TSA) solution which serves both as reducing reagent and stabilizer. The nanoparticles are characterized by ultraviolet-visible spectroscopy (UV–vis), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction analysis (XRD), X-ray photoelectron spectroscopy (XPS), the Raman spectra, transmission electron microscopy (TEM) and Zetasizer, respectively. The characteristic catalytic behavior of the Se nanoparticles is established by studying the decolorization of cango red in the presence of UV light. It is obvious that selenium catalyzes the reaction efficiently. The results show that the rate of dye decolorization varies linearly with the nanoparticle concentration and the rate of dye decolorization decreases with the size of the Se nanoparticles increasing.