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Novel two-dimensional nanostructures of magnesium oxide nanoparticles were synthesized by simple reflux method by changing the solvent and annealing temperature. The structural and surface morphology were investigated using X-ray diffraction spectra and High-resolution scanning electron microscopy (HR-SEM). The XRD spectrum showed that the synthesized MgO samples are pure cubic MgO. The HR-SEM picture...
In this study, a sol-gel method was used to obtain titanium dioxide nanoparticles. Titanium isopropoxide was used as a precursor and Hydrochloric acid was added to adjust the pH of the solution. The sol obtained was dried at 80°C and calcined at 450°C for 3hrs. The UV absorption spectra of synthesized TiO2 sample exhibited strong absorptions below 400 nm. The band gap is estimated using the (αEphot)^2...
To improve the photovoltaic conversion efficiency of the SWNT/n-Si configuration, we introduce p-type wide bandgap semiconductor Cu2O nanoparticles into the void space of the SWNT network. This has brought in several improvements for the SWNTs/n-Si junction: (1) increase light absorption in the original void space through the newly formed Cu2O/n-Si junctions, the new part of the original SWNTs/n-Si...
A novel and simple chemical reduction method at room temperature is described to synthesize nanocrystallite CdS, ZnS, CdxZn1-xS. In this method anhydrous cadmium chloride, zinc chloride, sulphur and sodium borohydride reacts at room temperature in organic solvent THF. The grown nanoparticles are characterized by XRD, TEM, EDX, UV-VIS absorption and photoluminescence. The particle sizes are in the...
Zinc sulfide (ZnS) nanoparticles were synthesized using chemical co-precipitation method. The structural and morphological properties of these particles were studied by X-ray diffraction (XRD) and Scanning electron microscopy (SEM). The crystallite sizes calculated from XRD patterns were 2.8nm and 29nm of as prepared sphalerite and annealed wurtzite ZnS particles respectively. UV-visible absorption...
Visible-light response CoAl2O4, MgFe2O4 and CoFe2O4 spinel nanoparticles were prepared by the inorganic salt sol-gel method, and characterized by using XRD, SEM and UV-Vis. The characterization show that the three photocatalysts were in spinel-type structure with the spherical-like particle size in the range of 3~20 nm. The absorbing wavelengths of the three photocatalysts were larger than 800 nm...
In this paper, we report the optical properties of magnesium (Mg)-substituted zinc oxide (ZnO) (Zn1-xMgxO) nanoparticles (diameter ≤ 20 nm). The ZnO and alloyed nanoparticles were synthesized by chemical route and have Wurzite structure. The maximum Mg substitution reported here is ≈7.5%. This leads to a blue shift of the absorption spectra by 0.5 eV as well as a blue shift of the near-band edge photo...
We report on the functionalisation of photosensitive chalcogenide glasses (ChGs) with near infrared (NIR) emitting quantum dots (QDs) to obtain active nonlinear three-dimensional (3D) photonic crystals (PhCs).
ZnSe nanoparticles embedded in SiO2 thin films were prepared by sol-gel method using zinc acetate dihydrate, selenic acid and TEOS as source materials. The ZnSe nanoparticles/SiO2 thin film composites were deposited on the glass substrate by dip coating technique. FESEM images show that morphology of embedded ZnSe nanoparticles affected by ZnSe/SiO2 molar ratio. The optical properties of thin film...
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