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Cerium oxide nanoparticles (CeO2-np) with Ce3+ rich surfaces were synthesized by ecofriendly route using tannic acid. XRD and SAED patterns confirm the cubic structure of CeO2-np. A semi-quantitative XPS analysis revealed the presence of 34 % Ce3+ ions. Tannic acid not only mediates the CeO2-np synthesis, but also helps in reduction of surface states from Ce4+ to Ce3+. Oxygen vacancies were evidenced...
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