Three different phases of thorium(IV) oxalate hydrate [Th(C 2 O 4 ) 2 ·xH 2 O] with different water contents, namely, the hexahydrate, dihydrate, and anhydrous phases, were prepared by thermal treatment of the as-precipitated hydrated thorium(IV) oxalates. With the change in water content, the structure changes from monoclinic (C2/m) for the hexahydrate to monoclinic (C2/c) for the dihydrate and finally to a highly disordered phase for the anhydrous state. The local coordination around the Th 4+ ions in these structures was monitored by using Eu 3+ ions as luminescent probes. The analyses of the emission spectra owing to the electric-dipole transitions (EDTs) and magnetic-dipole transitions (MDTs) of the Eu 3+ ions in the different phases revealed that the site symmetry around the Th 4+ ions decreases systematically

A simple electrochemical method of synthesis of polypyrrole/silver (PPy/Ag) nanocomposite is presented. The method is based on potentiodynamic polymerization of pyrrole followed by electrodeposition of silver employing a single potentiostatic pulse. The synthesized PPy film has embedded Ag nanocubes. The morphology and structure of the resulting nanocomposite were characterized by field emission scanning electron microscopy and X-ray diffraction. Electron paramagnetic resonance studies showed that silver nanoparticle deposition on polypyrrole leads to an increase in carrier density, indicative of enhanced conductivity of the resulting composite. Electrocatalytic performance of the prepared composite was examined for reduction of hydrogen peroxide and was compared with corresponding PPy film and bare glassy carbon electrode.

This work highlighted the role of defects, excitation energy, and energy transfer in realizing color tunable Green→ Red →White from a single phosphor. In this work thorium-based K2Th(PO4)2:Eu3+(KTPE) phosphor has...

Ultraviolet emitting Gd3+ doped phosphor has recently been getting lot of attentions among the optical science community owing to their several important applications in the area of photothermal therapy, transilluminator...

No abstract