| 초록 |
We fabricated carbonized titania particles to get color from white titania powder. First, uniform titania microspheres were synthesized by sol-gel process, in which titanium(Ⅳ) isopropoxide (TTIP) were used as precursor and dodecylamine (DDA) as a catalyst and stabilizer in methanol and acetonitrile co-solvent. The resultant particles had narrow size distribution ranging from 600 and 700 nm. Next, Carbonized titania particles were fabricated by heating titania powder under N2 gas flow at 500, 700 and 900 ℃. Color of carbonized powder was dark green. Carbon content of particles was between 2.0 and 3.0 wt%. The particles were characterized by reflected light microscopy, UV-visible reflectance spectrometer, powder X-ray diffraction(XRD), elemental analysis(EA), scanning electron microscopy(SEM) and fouriertransform infrared spectrometer(FT-IR). Hydrocarbon chain of DDA was useful for fabrication of carbonized titania particles. When carbonized titania particles were heating under air atmosphere at 500 ℃, the color turned pale green. Carbon content of particles decreased to less than 1.3 wt%. |
