Showing papers by "Sampat Raj Vadera published in 2009"
TL;DR: In this paper, a single step method was developed for the preparation of graphene oxide/Fe2O3 composites by exfoliation of graphite oxide with an oxygen-rich ferric acetyl acetonate complex.
124 citations
TL;DR: Aqueous dispersion of 4-8-nm size stable ZnO quantum dots exhibiting luminescence in the visible region have been synthesized by a simple solution growth technique at room temperature as mentioned in this paper.
113 citations
TL;DR: In this article, large-area arrays of highly oriented Co-doped ZnO nanorods with pyramidal hexagonal structure are grown on silica substrates by wet chemical decomposition of zinc-amino complex in an aqueous medium.
39 citations
TL;DR: In this article, a method for the synthesis of optically clear and stable colloidal solutions of silver nanoparticles is reported, where the materials have been synthesized at room temperature by chemical reduction of silver ions (silver nitrate) coordinated with dendrigraft polymer, polyethyleneimine (PEI) using formaldehyde in aqueous medium.
37 citations
TL;DR: In this paper, an α-Fe2O3 powder with an average particle size of 35 nm has been synthesized by using an aqueous solution-based synthetic route.
Abstract: Nanocrystalline pure α-Fe2O3 powder, with an average particle size of 35 nm, has been synthesized by using an aqueous solution-based synthetic route. DC electrical resistivity of the synthesized material was measured with respect to temperature by the two-probe method from 28° to 225°C. Room temperature resistivity of the nanopowder was ∼108Ω·cm. Magnetic hysteresis measurement revealed that the synthesized α-Fe2O3 nanopowder exhibited ferromagnetic behavior at room temperature. The hysteretic features are high saturation magnetization of 5.1 emu/g, high remanence of 2.2 emu/g, and coercivity of 200.5 Oe.
26 citations
TL;DR: In this paper, a precursor-based method was developed for the synthesis of nanostructured, single phase Ni-Zn ferrite powders (Ni1−xZnxFe2O4 with x=0·20, 0·35,0·50 and 0·60).
Abstract: A precursor based method has been developed for the synthesis of nanostructured, single phase Ni–Zn ferrite powders (Ni1–xZnxFe2O4 with x=0·20, 0·35, 0·50 and 0·60). Precursor powders were synthesised by reacting aqueous solutions of metal nitrates and ethylene diamine tetraacetic acid and then evaporating them to dryness. The precursors were calcined in air for 2·30 h at different temperatures ranging from 250 to 450°C. The powders synthesised in this manner were characterised by using X-ray diffraction, thermogravimetric differential scanning calorimetric analysis, Brunauer–Emmett–Teller surface area measurement and SEM. Magnetic characterisation was performed by using a vibrating sample magnetometer. The method provides a simple and cost effective route to produce single phase, Ni–Zn ferrite nanopowders, with average crystallite size of ∼25 nm, at comparatively low temperature.
10 citations