Nano Express

Nanoscale Research Letters

, Volume 4, Issue 11, pp 1335-1342

Open Access This content is freely available online to anyone, anywhere at any time.

Controlled Growth of WO3 Nanostructures with Three Different Morphologies and Their Structural, Optical, and Photodecomposition Studies

  • S. RajagopalAffiliated withThin Film & Nanomaterials Laboratory, Department of Physics, Bharathiar University
  • , D. NatarajAffiliated withThin Film & Nanomaterials Laboratory, Department of Physics, Bharathiar University Email author 
  • , D. MangalarajAffiliated withDepartment of Nanoscience and Technology, Bharathiar University
  • , Yahia DjaouedAffiliated withLaboratoire de Micro-Spectroscopies Raman et FTIR, Université de Moncton-Campus de Shippagan
  • , Jacques RobichaudAffiliated withLaboratoire de Micro-Spectroscopies Raman et FTIR, Université de Moncton-Campus de Shippagan
  • , O. Yu. KhyzhunAffiliated withDepartment of Structural Chemistry of Solids, Frantsevych Institute for Problems of Materials Science, National Academy of Sciences of Ukraine

Abstract

Tungsten trioxide (WO3) nanostructures were synthesized by hydrothermal method using sodium tungstate (Na2WO4·2H2O) alone as starting material, and sodium tungstate in presence of ferrous ammonium sulfate [(NH4)2Fe(SO4)2·6H2O] or cobalt chloride (CoCl2·6H2O) as structure-directing agents. Orthorhombic WO3 having a rectangular slab-like morphology was obtained when Na2WO4·2H2O was used alone. When ferrous ammonium sulfate and cobalt chloride were added to sodium tungstate, hexagonal WO3 nanowire clusters and hexagonal WO3 nanorods were obtained, respectively. The crystal structure and orientation of the synthesized products were studied by X-ray diffraction (XRD), micro-Raman spectroscopy, and high-resolution transmission electron microscopy (HRTEM), and their chemical composition was analyzed by X-ray photoelectron spectroscopy (XPS). The optical properties of the synthesized products were verified by UV–Vis and photoluminescence studies. A photodegradation study on Procion Red MX 5B was also carried out, showing that the hexagonal WO3 nanowire clusters had the highest photodegradation efficiency.

Keywords

Tungsten trioxide Hydrothermal Structure-directing chemicals Nanowires Nanorods Photodecomposition