Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Nanostructures

Characterizations study ZnO-TiO2 nano rods thick films as Photo detector

Raad Sadoon; Osama AbdulAzeez

Engineering and Technology Journal, 2015, Volume 33, Issue 6, Pages 1075-1081

First,ZnO nanorod s were su ccessfu lly synthesized by simple evaporation
method,u sing single stage controllable horizontaltu be fu rnace and qu artz tu be withou tcatalyst.The ZnO nano powd erwas mix ed with (10 and 20%)of TiO2 powd er(weightratio),then ZnO -TiO 2 thickfilms were synthesized u singsimple,low-cost efficient screen print techniqu e. The thick films were heated at 500 C ˚ for one hou rto remove the organic bind erand anyimpu rities.The prepared thickfilms were examined withX -Ray,and FESEM to stu d y the stru ctu raland morphology of the films,the X -ray results show that the films are polycrystalline with sharp and high intensity peaks indicating
high crystalinity of the product.The FESEM pictures show nanorods with diameters less than 100 nm and several micrometers in length
of ZnO withTiO 2 nanoparticles.ZnO -TiO 2 device was built up by electroding the thick films.The I-V characterization of the films were
studied in dark and light,then photo detection parameters were estimated and it was found to be efficient and high response in UV range detection

Fabrication of electro spinning 1D ZnO Nano fibers as UVPhotoconductor

Raad S. Sabry; Firas S. Mohammed; Roonak Abdul Salam A.Alkareem

Engineering and Technology Journal, 2015, Volume 33, Issue 5, Pages 884-894

The electrospinning technique was used to fabricate 1D nanofibers of Zinc Oxide (ZnO). Polyvinylpyrrolidone (PVP) ̸ zinc acetate Nano fibers electrospun using solution containing PVP dissolved in ethanol and zinc acetate in distilled water were mixed, followed by calcination at 500°C for 3hours to remove the polymer. XRD pattern show the hexagonal wurtzite structure of ZnO NFs without any impurities. FESEM pictures show a network of nanofibers with diameters less than 100 nm and several micrometers in length of ZnO, these nanostructures increase the ratio of surface area to volume and improve the physical properties of the materials. The Photoluminescence (PL) of the films was studied and the energy gap and the optical properties were estimated. A photoconductor device was constructed by electroding the films with silver conducting electrode (IDE) using screen print method, The result shown that the resistance of the nanofiber films decrease dramatically when exposes to UV light. In addition, the change of conductivity with the change of wavelengths was studied also the photoconductivity was examined under different bias voltage.