Optical properties of ferroelectric nanocrystal-containing polymer BaTiO3∕polycarbonate films

Abstract

BaTiO 3 ͑BT͒-nanocrystal-doped polycarbonate polymer composite thin films ͑BT/PC͒ with different BT concentrations were prepared by spin-coating method. Ultrafine BT ͑ϳ40-50 nm͒ nanocrystals with pure perovskite tetragonal phase were synthesized by hydrothermal method. The structure of BT nanocrystals and composite films were studied by means of x-ray diffraction and transmission scanning microscopy. The composite films were poled with a high electric field at a suitable temperature to yield a noncentrosymmetric arrangement and produce better electro-optic properties. The poling condition under external electric field was optimized through the dielectric properties of BT and PC polymer and the effective-field intensity theory. The electro-optic ͑EO͒ coefficients and transmittance of composite films with various BT concentrations were also evaluated. The average effective linear EO coefficient and figure of merit of 20-wt % BT-doped composite films were about 63.1 and 103.1 pm/ V, respectively. BT/PC composite films show excellent electro-optic properties for application in integrated optoelectronics and optics.

Fabrication of barium titanate nanoparticles‐epoxy resin composite films and their dielectric properties

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Magnetic and optical properties of polycarbonate/Fe nanocomposites

“…Relatively little attention has been paid to magnetism and optics characteristics. In past decades [7], optical polymers have received considerable attention because they have low dielectric constant and high transparency and are easy to manufacture [8]. Nanoparticles also have significant advantages such as low density and large specific surface area [9].…”

In-situ Transmittance Measurement of Polarization and Dielectric Relaxation Behaviors of LiNbO3 Ferroelectric Nanocrystal in Polycarbonate Matrix

“…Many ferroelectrics such as BaTiO 3 (BT), Pb(Zr,Ti)O 3 (PZT) and LiNbO 3 (LNO) have been investigated for the potential optical applications due to their high nonlinear optical (NLO) and electro-optic (EO) coefficients [6]. At the same time, optical organic polymers have been widely used due to their advantages like ease of processing, quick response, low dielectric constant and high transparency [7].…”