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Photoluminescent study of surface-functionalized BaTiO3 nanoparticles in a poly(methyl methacrylate) matrix
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[Fort Worth, Tex.] : Texas Christian University,
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2014
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BaTiO3 nanopowders of average grain sizes 50 nm and 100 nm were functionalized by (3-aminopropyl)triethoxysilane (3APTS) and mixed with poly(methyl methacrylate)/toluene solution. Nanocomposite thin films were synthesized by solution spin-coating on to Si substrates. The nanocomposites films morphology and chemical structure were studied via AFM and FTIR. The photoluminescence spectrum of the pure nanoparticles was composed of an emission at 3.0 eV and multiple bands centered at 2.5 eV. Surface functionalization of the BaTiO3 nanoparticles via 3APTS increased overall luminescence at room temperature while only enhancing the 3.0 eV emission at low-temperature. Polymer coating of the functionalized nanoparticles significantly enhances 3.0 eV emissions while decreasing emissions associated with near-surface lattice distortions at 2.5 eV.
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Physics and Astronomy