Which mechanism influences electrical conductivity when doping titanium dioxide nanoparticles with niobium ions?

💡 Explanation

When doping TiO2 nanoparticles with Nb5+ ions, charge compensation occurs via the creation of Ti3+ ions allowing electron polaron hopping between Ti4+ and Ti3+ sites since Nb substitutes for Ti without changing oxidation state and introduces mobile charge carriers. Therefore, increased polaron hopping occurs, rather than other options requiring alternate mechanisms or structural effects.

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