Biosynthesis of Iron and Cobalt Nanoparticles Using Garlic (Allium cativum) Extract and their Some Applications

It has been employed nano particles using garlic (Allium cativum) extract at conditions (pH=12, concentration = 0.1 M, temperature = 90 °C, time =3 hr. and Oxidizing agent (hydrozoan). X-Ray diffraction of Co NPs using Allium cativum with polycrystalline as compared to specification (JCPDS Card no. 030-0443) and the structure is cubic phase and showed nothing at any article than to extract used as search (chemical) method with the outfit that successful chemical picas distinct and no trace of moisture dust concentrations are enlargement were appropriate for the sample. XRD of Fe NPs using Allium cativum is polycrystalline depend on (JCPDS Card no. 052-0513) with peaks (111, 200, 220) and 2θ(42.7, 49.7, 73.1). FESEM pictures of cobalt and Iron nano particles. The nano particles morphology demonstrates irregular, cubic and hexagonal pattern of different sizes which are agglomerated. Other findings with larger magnifications show that all these pictures have soft surfaces. Co NPs / Fe NPs / c-Si n-type (100) structure has a better performance against Co NPs/Si n-type (100) and Fe NPs /Si n-type (100) structures, such that the output of solar cells efficiencies are 6.31, 7.03 and 7.8 % respectively. Cobalt and iron nanostructures produced naturally used to have anti bacterial behavior against pathogenic bacteria such as B-cereus and E-coli with (37, 39) mm, respectively.

OIL/WATER INTERFACE SYNTHESIS AND OPTICAL PROPERTY OF STRONTIUM TUNGSTATE NANORODS

Strontium tungstate nanorods with uniform morphology were controllably synthesized for the first time via a facile liquid–solid–solution (LSS) process through oil/water interface. These nanorods have diameters of about 50 nm and length of about 500 nm. XRD curves indicated that as-obtained nanorods were body-centered tetragonal phases with lattice parameters of a = 5.416 Å and c = 11.95 Å, which is consistent with the values reported in JCPDS card No. 08-0490. Study on the optical properties of as-obtained nanorods showed that SrWO 4 nanorods possess different optical properties from bulk counterpart. A mechanism of the formation process was also discussed.

Aerosol Synthesis of Pure and Pt-Doped ZnO Particles Using Nitrate and Pdda-Pt(IV) Complex Solutions

Pure and Pt-doped ZnO nanophase particles were synthesized by ultrasonic spray pyrolysis. The particles were obtained through the decomposition of zinc nitrate and with a newly developed Pt(IV) complex with 1,3-propylenediamine-N,N′-diacetate tetradentate class ligand (pdda). The complex was characterized by elemental analysis, electronic absorption and infrared spectroscopy. The form of the determined complex structure {trans-[Pt(pdda)Br2]·H2O} implies that Pt(IV) ion has a distorted octahedral coordination due to intramolecular N–H···Br interaction. The results of structural refinement (cell parameters, bond lengths, and ion occupancy) of ultrasonically derived pure and Pt-doped ZnO particles suggest either the formation of Zni interstitials or platinum ion incorporation into the ZnO lattice in octahedral interstitial positions, respectively. A well-crystallized hexagonal wurtzite structure of ZnO was pronounced in all investigated samples [JCPDS card 36-1415, Joint Committee on Powder Diffraction Standards, defined by International Centre for Diffraction Data (www.icdd.com)]. Phase determination also indicated the presence of a nitrate hydroxide hydrate phase (JCPDS card 24-1460), as a result of incomplete precursor decomposition and a spinel Zn2PtO4 phase (below 1.0 wt%) located in the boundary region for a Pt-doped ZnO sample. Based on x-ray diffraction, scanning electron microscopy, and energy-dispersive spectroscopy analyses, it was shown that the different particle growingmorphologies, which were either spheroidally or pyramidally shaped, were influenced by the precursor chemistry, processing parameters and the presence of platinum ions. The composite internal particle structure revealed by transmission electron microscopy and selected area electron diffraction analyses, implied that the secondary particles represent an assembly of primary particles sized under 60 nm aroused during the processes of nucleation, growth and aggregation. Both hexagonal and spheroidal shape of primary particles was evident. The particle morphology, primarily particle size and the mechanism of Pt4+ ion introduction into the ZnO cell was discussed based on the structural refinement and selected area electron diffraction analysis.