TY - JOUR
T1 - A new observation on the phase transformation of TiO2 nanoparticles produced by a CVD method
AU - Kim, Chan Soo
AU - Nakaso, Koichi
AU - Xia, Bin
AU - Okuyama, Kikuo
AU - Shimada, Manabu
N1 - Funding Information:
The authors wish thanks Mr. Masatoshi Tomonaga (Nitto Denko Co.) for helping with the experiment. This study was supported (in part) by funds from the Grant-in-Aid for Scientific Research on Priority Areas under Grant No. 14048216 from Ministry of Education, Culture, Sports, Science and Technology, in Japan and a Grant-in-Aid for Scientific Research (B) (No. 15360413) by Japan Society for the Promotion of Science (JSPS). In addition, this work was supported in part by the New Energy and Industrial Technology Development Organization (NEDO)’s “Nanotechnology Materials Program— Nanotechnology Particle Project” based on funds provided by the Ministry of Economy, Trade and Industry, Japan (METI).
PY - 2005/2
Y1 - 2005/2
N2 - Titania (TiO2) nanoparticles with primary diameters of less than 30 nm were produced by the thermal decomposition of TTIP and by the oxidation of TICl4 in a cylindrical furnace reactor at 1200°C. Particle size, crystalline phase, and phase transformation were investigated as a function of precursor concentration and total flow rate by TEM, a DMA/CNC system, XRD, and TG-DTA. The results show that both particle size and number concentration were increased with increasing precursor concentration, and that the primary size could be controlled by changing the operating conditions. An anatase-to-rutile phase transformation occurred at TTIP concentrations above 7.68 × 10-6 mol/l and this was enhanced with increasing precursor concentration. It is noteworthy that the transformation is independent of grain size but appears to be related to the presence of carbon impurities in the nanoparticles.
AB - Titania (TiO2) nanoparticles with primary diameters of less than 30 nm were produced by the thermal decomposition of TTIP and by the oxidation of TICl4 in a cylindrical furnace reactor at 1200°C. Particle size, crystalline phase, and phase transformation were investigated as a function of precursor concentration and total flow rate by TEM, a DMA/CNC system, XRD, and TG-DTA. The results show that both particle size and number concentration were increased with increasing precursor concentration, and that the primary size could be controlled by changing the operating conditions. An anatase-to-rutile phase transformation occurred at TTIP concentrations above 7.68 × 10-6 mol/l and this was enhanced with increasing precursor concentration. It is noteworthy that the transformation is independent of grain size but appears to be related to the presence of carbon impurities in the nanoparticles.
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U2 - 10.1080/027868290906986
DO - 10.1080/027868290906986
M3 - Article
AN - SCOPUS:14044274315
SN - 0278-6826
VL - 39
SP - 104
EP - 112
JO - Aerosol Science and Technology
JF - Aerosol Science and Technology
IS - 2
ER -