A flexible, porous TiOxNy sheet consisting of numerous conductive fibers was synthesized by nitridation of titanate and further used as an electrochemical electrode. The high surface area and mixed-oxidation state of titanium make TiOxNy sheets to be promising candidates for a good supercapacitor.
We
reveal the thickness effects on optical properties for nanoparticles
in the shape of hollow spheres theoretically and experimentally. Within
and beyond the electrically small limit, hollow spheres are shown
to have almost the same light absorption power as that of solid ones,
when the ratio of inner core to whole particle radii is smaller than
0.4. It means that one can maintain the level of light absorption
even with a large empty core. In the electrically small limit, we
expand the exact solution of Mie theory in power of the thickness
parameter and show that the thickness ratio has less influence on
light absorption. Moreover, we synthesize highly uniform hollow spheres
of TiO2 anatase through a self-sacrificing template method.
A variety of particle radii from 94 to 500 nm, with 50 nm in the shell
thickness, are performed experimentally in photocatalytic activity.
With experimental demonstrations and theoretical simulations, our
results provide a guideline in the design on the thickness for hollow-sphere
nanoparticles with an optimized absorption power in light harvesting.
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