Abstract
A facile template‐free controlled synthesis of Cu2O architectures from octahedral to its different truncated forms is successfully achieved. It is found that the precursor formation temperature is crucial to the designated‐tailoring on the {100} facets of Cu2O crystals, which can modify the ratio (R) between the growth rates along the 〈100〉 and 〈111〉 directions, leading to the formation of the initial structures with different shapes. The multiple morphologies can be evolved from these varied initial structures via the synergic effect of oriented attachment and ripening mechanism. This template‐free complex precursor‐based solution route has provided an innovative approach to design the {100} facets with different sizes to further enrich the current morphologies of Cu2O crystals.
Highlights
Much attention has been devoted to the morphologycontrolled synthesis of Cu2O crystals, and Cu2O crystals with different shapes have been fabricated, including cubes [16], octahedra [5], dodecahedra [17], 26-facets polyhedral [18, 19], nanowires [20], nanocages [21], multipods [22], hierarchical [7], and hollow structures [23]
The phase structure and purity of the products were examined by X-ray diffraction (XRD) characterization
It is found that the precursor formation temperature is crucial to designated-tailoring of the {100} facets of Cu2O crystals, which can modify the ratio (R) between the growth rates along the 100 and 111 directions, leading to the formation of the initial structures with different shapes
Summary
As a nonstoichiometric p-type semiconductor (direct band gap ∼2.17 eV) with unique optical [1], magnetic [2], and negative expansion properties [3], Cu2O (cuprous oxide) is a perspective material with applications in solar energy conversion [4], catalysis [5, 6], sensor [7, 8], negative electrode material for lithium-ion batteries [9], template [10, 11], metal-insulator-metal resistive switching memory [12], electrochromism [13, 14], and antibacterial activity [15]. Much attention has been devoted to the morphologycontrolled synthesis of Cu2O crystals, and Cu2O crystals with different shapes have been fabricated, including cubes [16], octahedra [5], dodecahedra [17], 26-facets polyhedral [18, 19], nanowires [20], nanocages [21], multipods [22], hierarchical [7], and hollow structures [23] Among these morphologies, highly symmetric structures (including cube, octahedron, and their truncated forms) are of particular interest due to their novel physical and chemical properties, which are different from other geometries by their intrinsic architectural characteristics with regard to lattice symmetry and surface energy [24]. The growth process and mechanism of Cu2O crystals are discussed in detail
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