• PDF / 428,935 Bytes
• 7 Pages / 432 x 648 pts Page_size
• 30 Downloads / 200 Views

DOWNLOAD

REPORT

---

Synthesis of ZnO at Different Atomic Proportion Produced by Chemical Precipitation A. Medina1,4,*, L. Béjar2, G. Herrera-Pérez3 UMSNH, Instituto de Investigaciones Metalúrgicas, Edificio U Ciudad Universitaria, C.P. 58040, Morelia, Michoacán, México 2 UMSNH, Facultad de Ingeniería Mecánica, Edificio W Ciudad Universitaria, C.P. 58040, Morelia, Michoacán, México 3 Departamento de Ingeniería en Materiales, Instituto Tecnológico Superior de Irapuato (ITESI) Carretera Irapuato-Silao Km. 12.5, El Copal, Irapuato, Guanajuato. C.P. 36821, México 4 SEP-DGEST-IT de Tlalnepantla, Av. Tecnológico s/n, Col. la Comunidad, Tlalnepantla de Baz, Edo México, 54070, México. * E-mail: [email protected] 1

ABSTRACT Zinc oxide (ZnO) nanoparticles were produced using chemical precipitation synthesis with a molar ratio of 1:1, 1:2 and 1:3. The structure, chemical composition and morphology were investigated by X-ray diffraction (XRD), energy dispersive spectroscopy (EDS), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and high resolution transmission electron microscopy (HRTEM). XRD and EDS demonstrated that the all particles formed at different atomic proportion were of wurtzite crystal structure with the same chemical composition. SEM and TEM showed the formation of hexagonal particles with a molar ratio of 1:1 while the samples synthesized with a molar ratio 1:2 and 1:3 showed a circular shape. HRTEM and Fast Fourier Transform (FFT) demonstrated that the all particles were formed with a preferable [0001] growth direction. Keywords: Chemical synthesis, scanning electron microscopy (SEM), nanostructure, crystal, grain size. INTRODUCTION In the past few years, one dimensional structure has generated the most excited in advancedmaterials research because of their fascinating properties from both scientific and engineeringoriented standpoints. ZnO is a piezoelectric and semiconducting material having wide band gap of 3.37 eV and potential applications used in nanoscale dye-sensitized solar cells [1,2] optoelectronics [3,4] gas sensors [5,6] and electronics [7,8]. ZnO is a versatile material with probably the broadest spectrum of applications ranging from optoelectronics to catalysis to sensors to cosmetic to nanomedicine [9,10]. Controllable synthesis of nanomaterials is very important to nanoscale science, which denotes fabrication on arrays with desirable morphology [11]. Arrays of ZnO exhibits diverse morphologies such as belts, tubes, rods [12], however, it is difficult up date to control the morphology of the structures through one synthesis process. Therefore, extensive research on the quasi-one-dimensional (1D) ZnO nanostructures has been

127

conducted recently. Diverse fabrication techniques, such a thermal evaporation, molecular beam epitaxy, vapor phase transport, chemical vapor deposition (CVD), metal organic, aqueous solution deposition, and electrochemical deposition, have been attempted to grow the materials [11]. The significances of the controllability manifest in both the chemistry of small-siz