Synthesis and optical properties of coil-ball-like CaMoO₄ hierarchical architectures

Coil-ball-like CaMoO₄ hierarchical architectures were fabricated via a simple solvothermal route. The structures and compositions of the as-prepared samples were characterized using X-ray powder diffraction, scanning electron microscopy, UV–vis spectrophotometer and Brunauer–Emmett–Teller. A series of experiments of reaction conditions including reaction time and the amount of N,N-dimethylacetamide (DMAc) were carefully carried out. The results showed that the amount of DMAc played a key role in the morphology of the products and the formation of the coil-ball-like CaMoO₄ hierarchical architectures was governed by an oriented aggregation, assembly and Ostwald ripening mechanism. The photoluminescence (PL) properties of the as-synthesized CaMoO₄ samples at different time intervals were investigated. The results revealed that all samples exhibit a broad emission peak in the visible region (390–600 nm) with 300 nm excitation wavelength at room temperature, but show different PL intensity.