Heena Khajuria

Facile hydrothermal synthesis of nanocomposites of nitrogen doped graphene with metal molybdates (NG-MMoO4) (M=Mn, Co, and Ni) for enhanced photodegradation of methylene blue

A facile one-pot hydrothermal synthesis of nanocomposites of nitrogen doped graphene with MnMoO4/CoMoO4/NiMoO4 is reported. The morphological and structural characteristics of prepared NG-MMoO4 nanocomposites have been characterized by Powder X-ray diffraction, Fourier transform vibrational spectroscopy, Scanning electron microscopy, Transmission electron microscopy and Thermal analysis. The molybdates are well-anchored and uniformly distributed on the surface of nitrogen doped graphene sheets. The nanocomposites exhibit excellent photocatalytic activity as demonstrated by photodegradation of methylene blue under Ultraviolet–Visible irradiation by using NG-MnMoO4 as catalyst.

Hydrothermal synthesis, characterization and luminescent properties of lanthanide-doped NaLaF4 nanoparticles

Nanoparticles of sodium lanthanum (III) fluoride-doped and co-doped with Eu3+/Tb3+ were prepared by the hydrothermal method using citric acid as structure-directing agent. Structural aspects and optical properties of synthesized nanoparticles were studied by powder X-ray diffraction (XRPD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED), energy-dispersive X-ray spectra (EDS), particle size by dynamic light scattering (DLS), Fourier transform infrared (FTIR) spectrum and photoluminescence (PL) techniques. Nanoparticles consist of well-crystallized hexagonal phase and the average crystallite size for undoped and doped-NaLaF4 nanoparticles are in the range of 20–22 nm. TEM images show that nanoparticles have cylindrical shape and crystalline nature of nanoparticles was confirmed by SAED patterns. Down- conversion (DC) luminescent properties of doped NaLaF4 were also investigated and impact of co-doping has been explored.

Synthesis and characterization of bi-functional magneto-luminescent Fe3O4@SiO2@NaLuF4:Eu3+ hybrid core/shell nanospheres

AbstractA step-wise synthetic method has been developed for the synthesis of multifunctional, magnetic luminescent nanocomposites with Fe3O4 nanospheres as the core encapsulated in silica and europium-doped sodium lutetium fluoride (NaLuF4:Eu3+) as the shell. X-ray powder diffraction (XRPD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), photoluminescence (PL), kinetics of luminescence decay and magnetic studies were used to characterize the structural, optical and magnetic properties of these nanospheres. SEM and TEM images define their spherical morphology with average crystallite size in the range of 90–180 nm. Ultraviolet excited photoluminescent properties of Eu3+ doped Fe3O4@SiO2@NaLuF4 nanospheres were investigated and impact of doping has been explored. Eu3+ as dopant ion induces highly efficient luminescence with average lifetime value of 6.235 ns. Fe3O4 magnetic core exhibits super-paramagnetic behavior at room temperature. Graphical AbstractBi-functional magneto luminescent Fe3O4@SiO2@NaLuF4:Eu3+ hybrid core/shell nanospheres synthesized via step-wise method is reported. The Fe3O4 magnetic core exhibits super-paramagnetic behavior at room temperature whereas europium-doped sodium lutetium fluoride (NaLuF4:Eu3+) shell induces highly efficient luminescent intensity with average lifetime value of 6.235 ns.

Hydrothermal synthesis of magnetic Fe 3 O 4 –nitrogen-doped graphene hybrid composite and its application as photocatalyst in degradation of methyl orange and methylene blue dyes in presence of copper (II) ions

Nanocomposite of Fe3O4–nitrogen-doped graphene (Fe3O4–NG) was synthesized by single step hydrothermal method. The as-synthesized composite was characterised by various techniques such as powder X-ray diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, vibrating sample magnetometry and thermal analysis (TGA). The catalytic role of synthesized nanocomposite in visible light induced photodegradation of methyl orange (MO; acidic dye) and methylene blue (MB; basic dye) was explored. The role of Cu(II) ions on the photodegradation of the organic dyes was also monitored. Cu(II) ions enhance the photocatalytic activity of nanocomposite by capturing photoelectron, thereby quenching the recombination process of electron–hole pair in photocatalyst.

Solvothermal synthesis of ZnO-nitrogen doped graphene composite and its application as catalyst for photodegradation of organic dye methylene blue

A facile one step solvothermal method is designed for the synthesis of visible light-sensitive ZnO-nitrogen doped graphene (ZNG) nano photocatalysts using ethylene glycol as a solvent as well as an agent to prevent aggregation of graphene layers. The deposition of ZnO nanoparticles onto the NG layers was confirmed by high resolution transmission electron microscope (HR-TEM), scanning electron microscope (SEM), powder X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). UV-Vis spectroscopy (UV-Vis) was used to study the enhanced photocatalytic activity, which shows the red-shift of the band-edge as compared to ZnO nano particles. The enhancement in photocatalytic activity is possibly due to the synergistic effect of improved adsorptivity of dyes, enhanced visible light absorption and effective charge separation.

Surfactant-assisted sacrificial template-mediated synthesis, characterization and photoluminescent properties of \(\hbox {LaPO}_{4}:\hbox {Eu}^{3+}\) phosphor

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Surfactant Assisted Sonochemical Synthesis and Characterization of Gadolinium Doped Zinc Oxide Nanoparticles

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Nitrogen doped Graphene Nickel Ferrite Magnetic Photocatalyst for the Visible Light Degradation of Methylene Blue

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