Structural Characterizations of Organo-Capped Barium Titanate Nanoparticles Prepared by the Wet Chemical Route.
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.
Wu
Xuedong
X
School of Chemistry and Chemical Engineering, Shanghai Jiaotong University, Shanghai, 200 240, People's Republic of China
Zou
Ling
L
Yang
Shengrong
S
Wang
Dapu
D