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Abstract
Synthesis of metal‐semiconductor heterostructures may allow the combination of function of the corresponding components and/or the enhanced performance resulting from the interactions between all the components. In this paper, Au@Cu2O core‐shell heterostructures are prepared by a seed‐growth method, using different‐shaped Au nanocrystals as the seeds such as nanorods, octahedra, decahedra, dots, and nanocubes. The results revealed that the final structure of Au@Cu2O was greatly influenced by the shape of the seeds used. Exposure of Cu2O{111} and Cu2O{001} favored when the overgrowth happened on Au{111} and Au{001} surface, respectively. The size of the product can also be tuned by the amount of the seeds. The results reported here provide a thinking clue to modulate the shape and size of core‐shell nanocrystals, which is useful in developing new materials with desired performance.
Highlights
Heterostructures have attracted enormous interest in the past decades, and due to that they could show enhanced and/or novel functions and performance, which is ascribed to the synergistic interactions between various components of them [1,2,3,4,5,6,7,8]
Pure Cu2O nanocrystals were synthesized with the method listed above
All the synthesis was based on a redox reaction
Summary
Heterostructures have attracted enormous interest in the past decades, and due to that they could show enhanced and/or novel functions and performance, which is ascribed to the synergistic interactions between various components of them [1,2,3,4,5,6,7,8]. Core-shell hybrid structures have proven especially useful in electrolyte membrane fuel cell electrodes, supercapacitor, and catalysts [2,3,4,5]. Because of its narrow forbidden band, Cu2O can absorb the visible light efficiently and has a high absorption coefficient [9]. It has potential applications in solar energy conversion and photocatalysis. Metal nanocrystals could be taken as the core to grow Cu2O shell and form metal@Cu2O structures. The reported Au@Cu2O heterostructures exhibit distinct optical properties [26,27,28,29,30], gas sensing [31, 32], and catalytic performance [28, 33]
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