title: Structural Characterizations of Organo-Capped Barium Titanate Nanoparticles Prepared by the Wet Chemical Route.
abstract: In the present study, nanoscale barium titanate particles were chemically prepared with organic shells on their surfaces. Their chemical and physical structures were characterized by FT-IR, FT-Raman, XRD, and XPS. Based on the results of characterizations, it can be concluded that the presence of organic ligands greatly influences the nucleation and surface chemistry of BaTiO(3) nanoparticles. Surface Ti(4+) tends to bond to stearate ions instead of the previous Ba(2+) in the starting materials. The usual preferable orientation growths of lattice, i.e., (101), (111), and (200), were significantly restrained due to surface coordination. Although poor crystallinity was observed, a tetragonal phase of BaTiO(3) nuclei could be inferred from both XRD and Raman patterns. Finally, the formation mechanism and structural model of organo-capped nanoparticles are discussed. Copyright 2001 Academic Press.
authors: School of Chemistry and Chemical Engineering, Shanghai Jiaotong University, Shanghai, 200 240, People's Republic of China
authors: Xuedong
authors: X
authors: Wu
authors: Ling
authors: L
authors: Zou
authors: Shengrong
authors: S
authors: Yang
authors: Dapu
authors: D
authors: Wang