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Preparation and Properties of Sb Doped ZnO Nanoparticles

Author: QiaoLiPing
Tutor: XuChangShan
School: Northeast Normal University
Course: Materials Physics and Chemistry
Keywords: Zinc oxide Variable temperature photoluminescence spectra Diluted magnetic semiconductors Quantum size effect Sol-gel method
CLC: TB383.1
Type: Master's thesis
Year: 2009
Downloads: 76
Quote: 1
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Abstract


ZnO as a wide band gap semiconductor material , single crystal band gap of about 3.37 eV, the exciton binding energy up to 60 meV at room temperature . Has wide applications in the manufacture of a transparent conductive electrode , the surface acoustic wave device , a sensor , flat- panel display member , solar batteries, etc. many areas . Doped magnetic semiconductor ZnO addition by the 3d transition metal cations (eg, Mn , Co, Fe , etc. ) , Dietl theoretically predicted most of the doped ZnO diluted magnetic semiconductor ferromagnetism was found , n-type diluted magnetic semiconductor material paramagnetic material , p-type dilute magnetic semiconductor ferromagnetism may occur . The theory predicts that the Sb-doped obtain p-type ZnO prepared Sb-doped , Mn -doped and Sb , Mn co-doped ZnO nanomaterials has important significance to study the structure and physical properties . In this thesis Sb-doped ZnO nanoparticles with sol-gel method , its structure and optical properties were characterized by XRD Raman photoluminescence . XRD and Raman spectra show that the Sb 3 instead of Zn 2 into the ZnO Sites of smaller , with the increase in the concentration of nanoparticles radius ; through the light of the variable temperature photoluminescence spectra calculated out 81 K acceptor binding energy of 131 meV , considered to be formed of Sb ?? Zn -2V Zn < / sub > complex theoretical calculation of its acceptor binding energy of 160 meV . The sol-gel prepared Mn-doped ZnO nanoparticles , XRD and Raman spectra show that Mn has been incorporated in the ZnO ; photoluminescence spectra showed that doping after UV-visible emission peak intensity have been greatly reduced , and doped UV emission peak blue shift. Sol-gel method Sb , Mn co-doped ZnO nanoparticles , XRD showed that Sb and Mn may enter an alternative form of the ZnO Sites of ; photoluminescence spectra show that Mn , Sb co-doped ZnO samples UV emission peak blue shift this may be due to the quantum size effect ; Raman spectra show that the doped sample after about 530 cm -1 a width of the Raman scattering peak .

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