Synthesis, Optical, Electrical And Catalytic Properties Of Titanium-Based Oxides Materials And Their Sodium-Doped Derivatives

• Main Author: Chew, Ker Yin
• Format: Thesis
• Language: English
• Published: 2016
• Subjects: QD1-999 Chemistry
• Online Access: http://eprints.usm.my/32027/1/CHEW_KER_YIN_24%28NN%29.pdf; http://eprints.usm.my/32027/

Barium titanat (BaTiO3) dan barium nikel titanat (Ba2NiTi5O13) telah disintesis melalui kaedah sol-gel. Mekanisma pembentukan BaTiO3 dan Ba2NiTi5O13 telah dicadangkan. Kesan pengedopan natrium (Na) pada komposisi struktur dan morfologi permukaan bagi 3 oksida berasas titanium iaitu titanium dioksida (TiO2), BaTiO3 and Ba2NiTi5O13 telah dikaji. Struktur-struktur fasa TiO2, BaTiO3 dan Ba2NiTi5O13 iaitu anatase, kubik dan monoklinik, masing-masing dikekalkan selepas pengedopan Na. Ini menunjukkan bahawa penggantian atom Na pada atom Ti adalah satu fenomena permukaan. Transformasi morfologi zarah-zarah pengedop-Na BaTiO3 telah diperhatikan. Penunjuk Hammett menunjukkan bahawa pengedop-Na Ba2NiTi5O13 mempunyai kebesan yang tertinggi. Daripada hasil analisa BET, pengedop-Na Ba2NiTi5O13 menunjukkan luas permukaan spesifik yang tertinggi berbanding dengan pengedop-Na BaTiO3 dan pengedop-Na TiO2. Aplikasi oksida berasas titanium tersebut sebagai pengisi dalam polivinil alkohol (PVA) telah dikaji. Barium titanate (BaTiO3) and barium nickel titanate (Ba2NiTi5O13) were synthesized via sol-gel method. Mechanism of formation of BaTiO3 and Ba2NiTi5O13 was proposed. The effect of Na doping on structural composition and surface morphology of 3 titanium-based oxides (i.e. titanium dioxide (TiO2), BaTiO3 and Ba2NiTi5O13) were investigated. The phase structures of TiO2, BaTiO3 and Ba2NiTi5O13 i.e. anatase, cubic and monoclinic respectively were sustained after Na doping. This indicates that the substitution of Na on Ti atom was a surface phenomenon. The morphology transformation of Na-doped BaTiO3 particles was observed. Hammett indicator showed that the Na-doped Ba2NiTi5O13 has the highest basicity. From BET result, the Na-doped Ba2NiTi5O13 showed the largest specific surface area as compared to Na-doped BaTiO3 and Na-doped TiO2. The application of these titanium-based oxides as the fillers in polyvinyl alcohol (PVA) was investigated.