Nanotechnology

Synthesize of optically and high luminescence of ZnO quantum dots in this work. XRD pattern show pure ZnO QDs and are genuinely polycrystalline with a hexagonal wurtzite structure. A typical TEM image of the material showed that particles are spherical in shape and their average size is (4) nm. No quantum dots with a diameter less than 2 nm or larger than 6.5 nm are found. PL spectrum of ZnO QDs is composed of an ultraviolet (UV) emission centered at about 360 nm and a broad green emission centered at about 475 nm.

Iron (II) Hydroxide nano particles were synthesized via chemical co precipitation method from Iron (II) chloride and Sodium Hydroxide. Structural and compositional properties were characterized by XRD, SEM, FTIR and UV spectroscopy X-ray diffraction (XRD) confirmed the preferential growth of Iron (II) Hydroxide nano particles that width is 30.91nm. The SEM image shows the synthesized Iron (II) Hydroxide show well crystallized particles with spherical morphology. The FTIR spectrum is used to study the stretching and bending frequencies of molecular functional groups in the sample. From UV spectrum, the band gap of Iron (II) hydroxide nano particles is found to be 3.5eV. From AAS studies it is found that the absorbance is directly proportional to the concentration. The linear fit indicates that Iron (II) Hydroxide nanoparticles have been distributed in proper proportion.

The Au and thiol substituted 2,5-divinylthiophene molecule has been studied for the zero field and various levels of applied external electric fields (EFs) using quantum chemical calculations coupled with AIM theory. The variation in geometrical parameters due to the various external EFs and the corresponding transport properties of the molecule has been analyzed. The variation in MPA and NPA charges, the reduction of HOMO-LUMO gap (from 2.34 to 1.08 eV) and the increase of electric dipole moment (from 0.98 to 13.21 D) with the increase of external EFs (from zero to 0.26 VÅ-1) of the molecule reveals that using thiol as linker and Au as electrodes, 2,5-divinylthiophene molecule can be act as an efficient molecular nanowire.

Quantum dots (QDs) are nanoparticles that have attracted widespread interest in medicine, drug delivery and imaging in living animals due to their unique electronic and optical properties. QDs with Bioconjugated have been introduced for imaging and targeting in living molecular cells, animal models and also in humans. Present efforts are focused on exploring the massive multiplexing capabilities of the QDs for Magnetic resonance imaging (MRI), drug delivery and in addition biocompatibility, bioconjugation and biotoxicity of QDs are also analyzed and discussed. These advances in the QD technology have unraveled a great deal of information about the molecular events in tumor cells and early diagnosis treatment.

Carbon nanotubes fluorescence in a region of the near-infrared, where human tissue and biological fluids are particularly transparent to their emission, but especially in the last decade it has attracted scientific and economic interest triggered by a rapid increase in response to specific biomolecules. A suitable scheme to conjugate the drug and the nanotube is required to make CNTs into viable delivery vehicles. In this present work, multi walled carbon nanotube decorated with titanium dioxide (TiO2-MWNTs) particles have been synthesized and employed as acceptor type materials in organic bulk heterojunction. The donor type material employed in the blend was regioregular poly (3-Octyl Thiophene) (RR-P3OT). X-ray diffraction (XRD), UV-Visible spectroscopy, FT-IR spectroscopy and scanning electron microscopy (SEM) characterized and analyzed.

Copper (II) Phosphate nano particles were synthesized via chemical co precipitation method from Copper Sulphate and Sodium Phosphate. The formed nano particle is characterized by powder X-ray diffraction, scanning electron microscopy, Ultra-violet spectroscopy and Fourier transform infrared spectroscopy, confirmed the preferential growth of Copper (II) Phosphate nano particles that width is 55.08 nm. The SEM image shows the synthesized Copper (II) Phosphate show well crystallized particles with cauli flower like morphology. The FTIR spectrum is used to study the stretching and bending frequencies of molecular functional groups in the sample. From UV spectrum, the band gap of Copper (II) Phosphate nano particles is found to be 2.5 eV. From AAS studies it is found that the absorbance is directly proportional to the concentration. The linear fit indicates that Copper (II) Phosphate nanoparticles have been distributed in proper proportion.

Lead (II) Phosphate nano particles were synthesized via chemical co precipitation method from Lead Nitrate and Sodium Phosphate. The formed nano particle is characterized by powder X-ray diffraction, scanning electron microscopy, Ultra-violet spectroscopy and Fourier transform infrared spectroscopy, confirmed the preferential growth of Lead (II) Phosphate nano particles that width is 41.09 nm. The SEM image shows the synthesized Lead (II) Phosphate show well crystallized particles with spherical morphology. The FTIR spectrum is used to study the stretching and bending frequencies of molecular functional groups in the sample. From UV spectrum, the band gap of Lead (II) Phosphate nano particles is found to be 3eV. From AAS studies it is found that the absorbance is directly proportional to the concentration. The linear fit indicates that lead (II) Phosphate nanoparticles have been distributed in proper proportion.

In this paper we report on the synthesis of single-crystal Mg2B2O5 nanowires by heating the precursor powder made of disodium tetraborate decahydrate and magnesium chloride dihydrate at 8500C. The as-received nanowires possess smooth surface with diameters varying between 25 and 40 nm. Also Mg2B2O5 nanorods doped with Eu were synthesized by firing a mixture powder of the above obtained Mg2B2O5 nanowires and Eu2O3 in air atmosphere. The as synthesized Mg2B2O5:Eu nanorods have diameters varying between 110 and 130 nm. The structural and compositional characteristics of the as-synthesized products have been investigated by XRD, SEM, TEM, EDX, and SAED techniques. Photoluminescence investigations reveal that both Eu+3 and Eu+2 can coexist in Mg2B2O5 nanorods. Eu2 display a violet emission beak at 412 nm and Eu3+ display broad emissions centered at 538 and 615 nm.

NiO NPs and Barium doped NiO NPs calcined for different periods of time (3hr, 4hr) at 700?C were synthesized through co-precipitation method. XRD analysis confirmed that all the samples exhibit FCC cubic structure. The doping of barium and also increasing the calcinations time of Ba:NiO increases the crystallite size .Optical absorption spectra reveal that energy gap decreases from 3.75 eV to 3.35 eV due to the increase in crystallite size.PL spectral analysis shows that emission intensity decreases with decreasing grain size. . The morphology of the NiO NPs and Ba:NiO NPs has been analyzed by FESEM and SEM respectively The results of antimicrobial activity of NiO NPs and Ba:NiO (4 hrs) against E-Coli indicated that NiO NPs have excellent inhibitory activity.

In the present work, Y2O3:Eu3+ nanoparticles like-spheres have been synthesized via simple method. Synthesis conditions such as calcination temperature and the additive 2,3-dihyrosybutanedioic acid are played a role for synthesizing Y2O3:Eu3+ nanoparticles with superior optical properties. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) studies have been carried out to understand surface morphological features and the particle size. The as-obtained nanoparticles have average crystallite size ranging between 25 to 45 nm. Crystal structure of the nanoparticles has been investigated by X-ray diffraction (XRD) technique. The incorporation of Eu3+ activator in these nanoparticles has been checked by luminescence characteristics, establishing that the main emission peak located at 613 nm corresponds to the hypersensitive forced electric dipole transition between 5D0 and 7F2 level of Eu3+ ions.