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Zn-doped and La/Zn co-doped TiO 2 nanoparticles were prepared by sol–gel method and utilized as the photocatalysts for the isomerization of norbornadiene to quadricyclane that has significant potential for solar energy storage and high-energy fuel synthesis. For Zn-doped samples, Zn ions do not enter the TiO 2 lattice, but distribute on the particle surface in the form of ZnO crystallites...
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