Figure 7.
Characteristic SEM images of nanotitanium etched in Piranha solutions and TiO2 coated by ALD (magnification: 200 k×, scale bar: 200 nm) (a) NH4OH/H2O2-15 min; (b) NH4OH/H2O2-2 h; (c) H2SO4/H2O2-15 min; and (d) H2SO4/H2O2-24 h.
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