title: Growth mechanism and photoluminescence property of flower-like ZnO nanostructures synthesized by starch-assisted sonochemical method.
abstract: Flower-like ZnO nanostructures have been synthesized by starch-assisted sonochemical method and the effect of starch and ultrasound on the formation of ZnO nanostructure has been investigated. It is observed that starch and ultrasonic wave both plays a vital role on the growth of ZnO nanostructure. X-ray diffraction (XRD) pattern indicated that the synthesized flower-like ZnO nanostructures were hexagonal. FTIR spectrum confirms the presence of starch on the surface of flower-like ZnO nanostructure. The photoluminescence spectrum of flower-like ZnO nanostructure consists of band-edge emission at 393nm as well as emission peaks due to defects. On the basis of structural information provided by X-ray diffraction (XRD) and morphological information by Scanning Electron Microscopy (SEM), a growth mechanism is proposed for formation of flower-like ZnO nanostructures. Differential Scanning Calorimetry (DSC) of starch in liquid medium confirms that gelatinization is a two step process involving two phases.
authors.affiliation: Nanophosphor Application Centre, University of Allahabad, Allahabad 211 002, India. priya_mishra15@rediffmail.com
authors.forename: Priya
authors.initials: P
authors.lastname: Mishra
authors.forename: Raghvendra S
authors.initials: RS
authors.lastname: Yadav
authors.forename: Avinash C
authors.initials: AC
authors.lastname: Pandey
mesh_terms: D002152:Calorimetry, Differential Scanning; D005782:Gels; D008163:Luminescent Measurements; D049329:Nanostructures / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013213:Starch / Q000737:chemistry*; D014465:Ultrasonics; D015034:Zinc Oxide / Q000737:chemistry*
chemical_list: D005782:Gels; D013213:Starch; D015034:Zinc Oxide