期刊
CHEMISTRY OF MATERIALS
卷 23, 期 10, 页码 2677-2684出版社
AMER CHEMICAL SOC
DOI: 10.1021/cm200708q
关键词
core-shell heterostructures; cuprous oxide; gold; nanostructures; photocatalysis
资金
- National Science Council of Taiwan [NSC 98-2113-M-007-005-MY3]
Rhombic dodecahedral and highly edge- and corner-truncated octahedral gold nanocrystal cores with entirely or significant {110} faces were employed to investigate the core-shell orientation relationship of Au-Cu2O core-shell heterostructures. By increasing the volume of reductant added, we synthesized Au-Cu2O face-raised cubes, cuboctahedra, and octahedra. TEM characterization indicates a fixed core-shell orientation relationship. The {100}, {110}, and {111} facets of the gold cores align parallel to the corresponding faces of the Cu2O shells. Structural requirements of the gold cores for the preparation of Au-Cu2O stellated icosahedra indicate that icosahedral gold nanocrystals are good candidates. Use of trisoctahedral nanocrystal cores cannot generate stellated icosahedra, but unusual face-raised octahedra with V-shaped {111} edges can be synthesized. Core-shell cubes, face-raised cubes, core-shell octahedra, and face-raised octahedra were examined for their comparative photocatalytic activity toward the photodegradation of methyl orange. Remarkably, all the cubes were found to be photocatalytically inactive because they are bounded by essentially {100} facets. Face-raised octahedra with more {111} facets showed significantly better photocatalytic performance than regular Au-Cu2O core-shell octahedra. The results reveal that gold nanocrystal-enhanced photocatalysis can be achieved only with Cu2O shells exposing proper facets.
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