Titanium dioxide （TiO2） nanosheet, nanorod and nanotubes are synthesized using chemical vapor deposition （CVD） and anodizing processes. TiO2 nanosheets are grown on Ti foil which is coated with Au catalyst in CVD,...Titanium dioxide （TiO2） nanosheet, nanorod and nanotubes are synthesized using chemical vapor deposition （CVD） and anodizing processes. TiO2 nanosheets are grown on Ti foil which is coated with Au catalyst in CVD, TiO2 nanorods are synthesized on treated Ti foil with HCl by CVD, and TiO2 nanotubes are prepared by the three-step anodization method. Scanning electron microscopy shows the final TiO2 structures prepared using three processes with three different morphologies of nanosheet, nanorod and nanotube. X-ray diffraction verifies the presence of TiO2. TiO2 sheets and rods are crystalized in rutile phase, and TiO2 tubes after annealing turn into the anatase crystal phase. The optical investigations carried out by diffuse reflection spectroscopy reveal that the morphology of TiO2 nanostructures influencing their optical response and band gap energy of TiO2 is changed for different TiO2 nanostructures.展开更多
The radial dependence of edge plasma turbulence is investigated in the IR-T1 tokamak.The radial profile of the fluctuation level and spectra are measured using an array of Langmuir probes(rake probe)in the r/a=0.75-1....The radial dependence of edge plasma turbulence is investigated in the IR-T1 tokamak.The radial profile of the fluctuation level and spectra are measured using an array of Langmuir probes(rake probe)in the r/a=0.75-1.2 region.In all radial positions the edge plasma is turbulently unstable,with a broad band fluctuation spectrum in the frequency range f=10-1000 kHz.The relative fluctuation level,as monitored by the ion saturation current J_(+),is always highest near the wall and decreases monotonically toward the plasma center,while the shape of the fluctuation power spectra is almost unchanged.The result of this experiment shows that in contrast to the more inner regions,the plasma near the wall does not simply have a small density fluctuation about a mean,but rather a shredded structure in which one can imagine that discrete shreds of plasma interact with one another rather than with the average background.展开更多
文摘Titanium dioxide （TiO2） nanosheet, nanorod and nanotubes are synthesized using chemical vapor deposition （CVD） and anodizing processes. TiO2 nanosheets are grown on Ti foil which is coated with Au catalyst in CVD, TiO2 nanorods are synthesized on treated Ti foil with HCl by CVD, and TiO2 nanotubes are prepared by the three-step anodization method. Scanning electron microscopy shows the final TiO2 structures prepared using three processes with three different morphologies of nanosheet, nanorod and nanotube. X-ray diffraction verifies the presence of TiO2. TiO2 sheets and rods are crystalized in rutile phase, and TiO2 tubes after annealing turn into the anatase crystal phase. The optical investigations carried out by diffuse reflection spectroscopy reveal that the morphology of TiO2 nanostructures influencing their optical response and band gap energy of TiO2 is changed for different TiO2 nanostructures.
文摘The radial dependence of edge plasma turbulence is investigated in the IR-T1 tokamak.The radial profile of the fluctuation level and spectra are measured using an array of Langmuir probes(rake probe)in the r/a=0.75-1.2 region.In all radial positions the edge plasma is turbulently unstable,with a broad band fluctuation spectrum in the frequency range f=10-1000 kHz.The relative fluctuation level,as monitored by the ion saturation current J_(+),is always highest near the wall and decreases monotonically toward the plasma center,while the shape of the fluctuation power spectra is almost unchanged.The result of this experiment shows that in contrast to the more inner regions,the plasma near the wall does not simply have a small density fluctuation about a mean,but rather a shredded structure in which one can imagine that discrete shreds of plasma interact with one another rather than with the average background.
