SYNTHESIS STRATEGY OF NANOSTRUCTURED TITANIA WITH BCL MORPHOLOGY

• Main Author: VONI STEKY, FRY
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/27420
• Institution: Institut Teknologi Bandung

TTitanium dioxide (TiO2) is one of semiconductor materials that plays an important role in <br /> <br /> technological development. One application of TiO2 is as a photocatalyst and catalyst support <br /> <br /> material. The arrangement of TiO2 morphology is important to support both applications. One <br /> <br /> of the most interesting morphologies today is the bicontinuous concentric lamellar (bcl) that <br /> <br /> has been successfully synthesized on silica-based materials. If the morphology is owned by <br /> <br /> TiO2 then the surface area and its accessibility will increase significantly. Slow hydrolysis is <br /> <br /> the key in the synthesis stage of monodispersed spherical TiO2 particles from Titanium (IV) <br /> <br /> Isopropoxide (TTIP) precursors through precipitation in ethanol. Modification of surface <br /> <br /> morphology of TiO2 particles is carried out by swelling method with ammonia and followed <br /> <br /> by phase segregation process in solvothermal process that produce particles in bcl <br /> <br /> morphology. The TiO2 particles of anatase structure with bcl morphology were obtained <br /> <br /> through calcination at 500 °C for 1 hour. The products of each synthesis stage were <br /> <br /> characterized using SEM, HRTEM, XRD and Raman spectroscopy. Based on SEM <br /> <br /> characterization, it is known that the synthesis product has a bcl morphology with particle size <br /> <br /> of 500-2000 nm. The morphology of this material did not change significantly after the <br /> <br /> calcination process, but its structure changed from amorph to crystalline anatase polymorphs <br /> <br /> indicated by XRD and Raman spectra. Through the observation of HRTEM, it appears that the <br /> <br /> resulting TiO2 particle has a lamellar structure on the surface of the particle, while its center is <br /> <br /> arranged dense. The transition process from amorphous to anatase is clearly revealed by <br /> <br /> temperature dependent Raman measurement from 20 to 540 °C, where an amorphous/anatase <br /> <br /> phase transition occurs over a temperature range of 380-400 °C.