Tailoring of heterostructures in a SnO2∕TiO2 system by the oriented attachment mechanism

Abstract

In order to verify the possibility of forming a heterostructure—i.e., a nanoparticle tailored by the junction of two or more different materials—through the oriented attachment (OA) mechanism, experiments with rutile TiO2 and cassiterite SnO2 as candidate materials were done, since they have similar crystallographic parameters. The experiments were carried out in hydrothermal conditions and in an in situ observation at the high resolution transmission electron microscopy. The results showed the formation of TiO2∕SnO2 heterostructures, confirming the coexistence of rotation-alignment and oriented collision mechanisms, hypothesis of OA behavior proposed in previous theoretical works.