Preparation of Lead Titanate Ultrathin Film Using Langmuir-Blodgett Film as Precursor

概要

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The Langmuir-Blodgett (LB) method is investigated as a process for the fabrication of ultrathin films of oxides such as lead titnate. LB film was fabricated by depositing a monolayer prepared from a fatty acid such as stearic acid (C_<17>H_<35>COOOH) and a subphase containing lead chloride (PbCL_2) and titanium potassium oxalate (K_2TiO(C_2O_4)_2). For converting from an LB film containing lead and titanium to an inorganic film, ultraviolet/ozone (UVO) treatment was applied. Subsequent thermal annealing resulted in a dense oxide ultrthin film. The crystallographic orientation of lead titanate thin films was controlled by conditions of precursor preparation such as the molecular ratio of lead and titanium, pH value and/or temperature in the subphase and the surface pressure. An X-ray diffraction pattern of the thin film indicating a well-defined perovskite structure was observed. Moreover, the results demonstrated the potential application of LB deposition for controlling the crystalllographic orientation of lead titanate ultrathin films, particularly in the (111) or (101)(110) planes.
社団法人応用物理学会の論文
1999-09-30