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(a,b) SEM images of hollow MoO2 spheres, inset shows the schematic structure of this nanomaterial, (c) SERS spectra of rhodamine 6G adsorbed on the hollow MoO2 nanospheres after various anodization times from 10–7 M rhodamine 6G solution, (d) SERS spectra of rhodamine 6G adsorbed from solutions with different concentrations on the hollow MoO2 nanospheres. Reprinted with permission from [73].
