Abstract
As-received BaTiO3 nanopowders of average grain sizes 50 nm and 100 nm were functionalized by (3-aminopropyl)triethoxysilane (APTES) and mixed with poly(methyl methacrylate)/toluene solution. The nanocomposite solution was spin coated on Si substrates to form thin films. The photoluminescence spectrum of the pure powder was composed of a bandgap emission at 3.0 eV and multiple bands centered about 2.5 eV. Surface functionalization of the BaTiO3 powder via APTES increases overall luminescence at room temperature while only enhancing bandgap emission at low-temperature. Polymer coating of the functionalized nanoparticles significantly enhances bandgap emissions while decreasing emissions associated with near-surface lattice distortions at 2.5 eV.
Highlights
Barium titanate (BTO)/poly(methyl) methacrylate (PMMA) nanocomposites have recently been gaining popularity due to their auspicious properties desirable in optoelectronic applications
In this paper we investigate photoluminescent properties of BTO/PMMA thin film nanocomposites to elucidate the role of the BTO/PMMA interface in the luminescent characteristics of the composite
Fourier Transform Interferometry (FTIR) was utilized to confirm the functionalization of the BTO by aminopropyl triethoxysliane (APTES)
Summary
Barium titanate (BTO)/poly(methyl) methacrylate (PMMA) nanocomposites have recently been gaining popularity due to their auspicious properties desirable in optoelectronic applications. It is well established that in many instances luminescent spectra of oxide/polymer composites do not represent a simple superposition of the luminescent features of a matrix and a filler, but they can reveal many processes germane to the composite nature of the material, such as modified scattering [1], random lasing, and additional emissions [17] occurring at the matrix/filler interface The latter is of particular interest since numerous characteristics of the oxide fillers are dominated by surface properties due to the high surface-to-volume ratio of nanoparticles. Photoluminescence (PL) studies of ZnO/PMMA nanocomposites have shown that embedding ZnO nanoparticles in PMMA quenches defect-related emissions while enhancing excitonic luminescent processes attributable to the interface between ZnO and the polymer [18,19,20]. In this paper we investigate photoluminescent properties of BTO/PMMA thin film nanocomposites to elucidate the role of the BTO/PMMA interface in the luminescent characteristics of the composite
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