tailieunhanh - Examining the phase composition of TiO2 nanoparticles derived from sol gel: Impact of reaction and processing conditions

TiO2 nanoparticles with crystallite size less than 15 nm were prepared from TiCl4 precursor by a modified sol-gel route. As-prepared TiO2 nanoparticles were extensively characterized using X-ray diffractometry, and their crystallite size was calculated using Debye-Scherrer formula. | Section on Physics and Chemical Engineering - Vol. 01 No. 02 Oct. 2023 EXAMINING THE PHASE COMPOSITION OF TiO2 NANOPARTICLES DERIVED FROM SOL-GEL IMPACT OF REACTION AND PROCESSING CONDITIONS Van Thuy Vu1 Van Manh Nguyen2 Viet Thu Tran1 1Faculty of Physics and Chemical Engineering Le Quy Don Technical University Hanoi Vietnam 2Faculty of Chemical Technology Hanoi University of Industry Abstract TiO2 nanoparticles with crystallite size less than 15 nm were prepared from TiCl4 precursor by a modified sol-gel route. As-prepared TiO2 nanoparticles were extensively characterized using X-ray diffractometry and their crystallite size was calculated using Debye-Scherrer formula. The phase composition and crystallite size of TiO2 nanoparticles were dependent on reaction parameters including TiCl4 concentration reaction temperature annealing temperature and surfactant. The crystallite size increases with increasing annealing temperature. Amorphous-anatase phase transition occurs at 400 - 450 C and anatase-rutile phase transition occurs at ca. 700 C. Keywords TiO2 nanoparticles sol-gel anatase rutile crystal structure. 1. Introduction In recent decades TiO2 nanomaterials have attracted numerous research and development efforts due to its exceptional optical physical and chemical properties 1 2 . Among their various allotropes 3 TiO2 in anatase and rutile phases has received the most interest due to their photocatalytic properties and superhydrophilicity which endose them to be used in photocatalytic processes including decomposition of organic compounds sterilization and CO2 reduction 1 4 . It has been widely known that phase composition and particle size are among most important factors determining properties and applications of TiO2 nanomaterials 5-8 . TiO2 nanoparticles NPs can be conveniently prepared by solution routes 9 . Among them hydrolysis of inorganic or organometallic salts of titanium such as TiCl4 is conveniently used as initial step in the production of TiO2 10