화학기상응축 공정으로 제조한 TiO2 나노분말의 광촉매 특성

Abstract

TiO2 nanopowder was synthesized by chemical vapor condensation (CVC) process and its photocatalytic property depending on microstructure was considered in terms of decomposition rate of organic compound. In order to control microstructure of TiO2 nanopowder such as particle size and degree of agglomeration, precursor flow rate representing number concentration was changed as a process variable. In TEM observation, spherical TiO2 nanoparticles with average size of 20 nm showed gradual increases in particle size and degree of agglomeration with increase of precursor flow rate. Also decomposition rate of organic compound increased with decreasing precursor flow rate. Thus, it was concluded that photocatalytic property was enhanced by large surface area of dispersed TiO2 nanoparticles synthesized at lower precursor flow rate condition in CVC process.