Author/Authors :
Norfarina Hasbullah, Nurul Advanced Nano Materials (ANoMa) Research Group - 2School of Fundamental Science - Universiti Malaysia Terengganu - 21300 Kuala Terengganu - Terengganu, Malaysia , Chen, Soo Kien Department of Physics and - Department of Chemistry - Faculty of Science - Universiti Putra Malaysia - 43400 Serdang - Selangor, Malaysia , Ban Tan, Kar Department of Chemistry - Faculty of Science - Universiti Putra Malaysia - 43400 Serdang - Selangor, Malaysia , Abidin Talib, Zaina Department of Physics and - Department of Chemistry - Faculty of Science - Universiti Putra Malaysia - 43400 Serdang - Selangor, Malaysia , Jew Lee, Oon Advanced Nano Materials (ANoMa) Research Group - School of Fundamental Science - Universiti Malaysia Terengganu - 21300 Kuala Terengganu - Terengganu, Malaysia
Abstract :
This work providesan insight on the photoluminescentbehaviour of BaTiO3(BTO) nanoparticles synthesised via a hydrothermal process at 200°C with further heat treatment at 1000°C. The morphology of BTO nanoparticles evolved to pseudo-ellipsoid bytuning the concentration ratioof barium precursors(Ba), oleic acid (OA) surfactant andtert-butylamine (TA) additive.Tunable optical band gaps (3.58–4.06 eV), Urbach tails in UV–Vis absorption spectra and the enhanced intensity of room temperature photoluminescence at violet wavelength (433.7 nm) were observed in BTO nanoparticles. The structural evolutionand phase formationindicatedthat structural disorder and surface state share equal dominant factors for improving the photoluminescence at violet wavelength, tuningoptical band gaps and exhibiting Urbach effect in the absorption spectra.
Keywords :
BaTiO3 , ferroelectric , photoluminescence , Urbach tail
