Title |
Controlling Core/Shell Formation of Nanocubic p‑Cu2O/n‑ZnO Toward Enhanced Photocatalytic Performance
|
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Published in |
Langmuir, June 2015
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DOI | 10.1021/acs.langmuir.5b01019 |
Pubmed ID | |
Authors |
Ahmad Esmaielzadeh Kandjani, Ylias Mohammad Sabri, Selvakannan R. Periasamy, Nafisa Zohora, Mohamad Hassan Amin, Ayman Nafady, Suresh Kumar Bhargava |
Abstract |
p-type Cu2O/n-type ZnO core/shell photo-catalysts has been demonstrated to be an efficient photocatalyst as a result of their interfacial structure tendency to reduce the recombination rate of photo-generated electron-hole pairs. Monodispersed Cu2O nanocubes were synthesized and functioned as the core, on which ZnO nanoparticles were coated as the shells having varying morphologies. The evenly distributed ZnO decoration as well as assembled nano-spheres of ZnO were carried out by changing the molar concentration ratio of Zn/Cu. The results indicate that the photocatalytic performance is initially increased owing to formation of small ZnO nanoparticles and production of efficient p-n junction hetero-structures. However, with increasing Zn concentration, the decorated ZnO nanoparticles tend to form large spherical assemblies resulting in decreased photocatalytic activity due to the inter-particle recombination between the agglomerated ZnO nanoparticles. Therefore, photocatalytic activity of Cu2O/ZnO hetero-structures can be optimized by controlling the assembly and morphology of the ZnO shell. |
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