Abstract
BiFeO3 (BFO) thin films were successfully deposited on self-assembled monolayers (SAMs) by the liquid phase deposition method. The measurement of contact angle and atomic force microscopy (AFM) showed that after immersion in an octadecyl trichlorosilane (OTS) solution for 30 min, the surface of the substrate was covered with a smooth, hydrophobic layer. After UV irradiation for 30 min, the smooth hydrophobic layer changed into a serrated hydrophilic layer. This indicated that the OTS-SAMs played an active role as chemical templates in controlling nucleation and growth of the BFO thin film. The phase and the surface topography of the BFO film were investigated respectively by X-ray diffraction, Field emission scanning electron microscopy (FE-SEM) and AFM. The results showed that the optimum annealing temperature and deposition temperature for preparing the BFO thin film were 600 and 70 °C respectively. The films were annealed at 600 °C for 2 h. As-prepared thin films were smooth, uniform, and dense with the height varying between 20 and 100 nm. Moreover, patterned BFO nanoarrays were prepared.
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