SYNTHESIS, CHARACTERIZATION AND OPTICAL BAND GAP OF PIROCHROMITE (MGCR2O4) NANOPARTICLES BY STEARIC ACID SOL-GEL METHOD

In this study, we have successfully synthesized Fe3+ doped SiO2/TiO2 thin films on glass substrates using the sol-gel dip-coating method. After synthesizing, the samples were annealed at 5000C in the air for 1 hour. The characteristics and optical properties of Fe3+ doped SiO2/TiO2 films were then i[r]

Abstract An eco-friendly lactobacillus sp. (microbe) assisted synthesis of titanium nanoparticles is reported. The synthesis is performed at room temperature. X-ray and transmission electron microscopy analyses are performed to ascertain the formation of Ti[r]

The photocatalytic activities of the as-synthesized samples were evaluated by the degradation of aqueous KGL solution. 100 mg photocatalyst was added into 250 mL, 20 mg/L KGL solu- tion and stirred for 20 min to reach the absorption equilibrium, then exposed to UV light ([r]

10.2 EXTRINSIC SEMICONDUCTOR
10.2.1 Electron and hole concentrations
Extrinsic semiconductors are formed by adding specific amounts of impurity atoms to the silicon crystal. An n-type semiconductor is formed by doping the silicon crystal with elements of[r]

The quantum confinement effect plays a crucial role in blue-shifting the absorption edge and the band gap energy of both solid PbS nanoparticles and a thin spherical P[r]

Borotellurite glasses were prepared by melt quenching technique. Amorphous nature of samples was confirmed through X-ray diffraction (XRD) patterns. Effect of B2O3 content on the structure of glass network was studied through Fourier-transform infrared spectroscopy (FTIR) spectra. Optical band gap a[r]

The present paper reveals the synthesis of polyaniline, polyaniline nanoparticles and polyaniline composite. Improvement of polyaniline properties can be achieved either by forming composites and nanocomposites of aniline, or blends with commercially available polymers or inorganic materials which o[r]

A solid acid membranes based on poly (vinyl alcohol) (PVA), sodium bromide (NaBr) and phosphoric acid (H3PO4) were prepared by a solution casting method. The morphological, IR, electrical and optical properties of the (PVA)0.7(NaBr)0.3(H3PO4)xM solid acid membranes where x = 0.00, 0.85, 1.7, 3.4, 5.[r]

In the present work, Co impurities were introduced to host NBTO materials through the sol-gel method. Results demonstrated the reduction in the optical band gap of pure and Co-doped NBTO, and that the observed room temperature ferromagnetism in Co-doped NBTO materials originates as an intrinsic phen[r]

61 results than Method 1 which involves heating both metal alkanethiolates simultaneously. Both methods are fast and facile. The evidence of alloys being formed is obtained from absorption spectroscopy where only one absorption band is observed[r]

Ballato, Synthesis, luminescence and scintillation of rare earth doped lanthanum fluoride nanoparticles, Optical Materials 33 (2010) 136. Stanley May, Frank C.J.M[r]

Abstract
In this study, a series of manganese [Mn]-doped zinc oxide [ZnO] hierarchical microspheres [HMSs] are prepared by hydrothermal method only using zinc acetate and manganese acetate as precursors and ethylene glycol as solvent. X-ray[r]

To study the optical properties and defects that exist in the band gap of the materials, we measured photoluminescence spectra at room temperature.. Room temperature p hotoluminesce[r]

Silver nanoplates (SNPs) having different size were synthesized by a seed-mediated method. The seeds-silver nanoparticles with 4–6 nm diameters were synthesized first by reducing silver nitrate with sodium borohydride in the present of Trisodium Citrate and Hydrogen peroxide.

the lattice substitutionally at Sn 4 þ site and specifically that iron enters the lattice in its high spin ferric state 6 S 5/2 . In SnO 2 each tin ion is octahedrally surrounded by six oxygen ions at nearly equal distances. If an iron ion substitutes for a tin ion, an[r]

Optical tweezers have been seen as an essential tool for manipulating dielectric microparticles and nanoparticles thanks to its non-contact action and high resolution of optical force. Up to now, there has been a lot of optical tweezers applications in the fields of biophysics, chemistry, medical sc[r]

In this paper, Origin is applyed to analyze samples and give some results about the fluorescence spectrum of SiO2-Al2O3 glass material, which is produced by Sol-Gel method.

and the polymorphic phase boundary ( T O-T ) to room temperature, thus improving the
piezoelectric performance. It is believed that this is due to the coexistence of the orthorhombic-tetragonal phases at room temperature, and this allows a better poling process because of[r]

proceeds in two directions; chain copolymerization of diols or ROP of cyclic carbonate monomers. The latter route utilizes a variety of catalysts, granting low control over molecular weights, high polydispersity (more than 1.2) and low[r]

The main contents of the thesis: Synthesis and characterization of Fe3O4 nanoparticles, -Fe2O3 nanoparticles and γ-Fe2O3 nanoparticles by hydrothermal method. Compare the corrosion protection ability of epoxy film containing synthetic iron oxide particles. Fabrication and evaluation of steel corro[r]