AVS 49th International Symposium
    Surface Engineering Monday Sessions
       Session SE+NS-MoA

Paper SE+NS-MoA3
Structural, Optical and Photocatalytic Properties of Nd@super 3+@ Doped TiO@sub 2@ Nanoparticles

Monday, November 4, 2002, 2:40 pm, Room C-111B

Session: Nanoparticle and Nanofiber Surface Technologies
Presenter: W. Li, University of Delaware
Authors: W. Li, University of Delaware
S.I. Shah, University of Delaware
C.-P. Huang, University of Delaware
O. Jung, Chosun University, Korea
Correspondent: Click to Email
TiO@sub 2@ nanoparticles, with Nd@super 3+@ dopant concentration ranging from 0 to 1.5 at.%, were synthesized using metallorganic chemical vapor deposition. The dopant concentration and TiO@sub 2@ stoichiometry were verified by x-ray photoelectron spectroscopy and energy dispersive x-ray spectroscopy. Particle size and crystal structure were obtained by x-ray diffraction and high-resolution transmission electron microscopy which showed the nanoparticles are polycrystalline anatase with 22 nm average particle size. Red shifts of TiO@sub 2@ absorption edge with the increase of Nd@super 3+@ concentration were observed by spectrophotometery. 1.5 at.% Nd@super 3+@ shows ~0.15 eV red shift. The photoreactivities of Nd@super 3+@ doped and undoped TiO@sub 2@ were measured by studying the degradation of 2-chlorophenol solutions under ultra violet radiation. Nd@super 3+@ position in TiO@sub 2@ lattice critically affects the photocatalytic activity of TiO@sub 2@ nanoparticles. Nd@super 3+@ position in TiO@sub 2@ lattice was studied by using XRD peak shifts. The results of these studies will be presented.